path: root/spectro/spyd2.c

/* 
 * Argyll Color Correction System
 *
 * Datacolor/ColorVision Spyder 2/3/4 related software.
 *
 * Author: Graeme W. Gill
 * Date:   17/9/2007
 *
 * Copyright 2006 - 2014, Graeme W. Gill
 * All rights reserved.
 *
 * (Based initially on i1disp.c)
 *
 * This material is licenced under the GNU GENERAL PUBLIC LICENSE Version 2 or later :-
 * see the License2.txt file for licencing details.
 */

/*
	IMPORTANT NOTES:

    The Spyder 2 instrument cannot function without the driver software
	having access to the vendor supplied PLD firmware pattern for it.
    This firmware is not provided with Argyll, since it is not available
    under a compatible license.

    The purchaser of a Spyder 2 instrument should have received a copy
    of this firmware along with their instrument, and should therefore be able to
    enable the Argyll driver for this instrument by using the oeminst utility
	to create a spyd2PLD.bin file.

	[ The Spyder 3, 4 & 5 don't need a PLD firmware file. ]


    The Spyder 4 & 5 instrument will not have the full range of manufacturer
	calibration settings available without the vendor calibration data.
    This calibration day is not provided with Argyll, since it is not
	available under a compatible license.

    The purchaser of a Spyder 4 or 5 instrument should have received a copy
    of this calibration data along with their instrument, and should therefore
	be able to enable the use of the full range of calibration settings
	by using the spyd4en utility to create a spyd4cal.bin file.

	Alternatively, you can use Argyll .ccss files to set a Spyder 4
	calibration.

	[ The Spyder 2 & 3 don't need a calibration data file. ]

	The hwver == 5 code is not fully implemented.
	It's not possible to get it going without an instrument to verify on.
	(Perhaps it has only 4 sensors ?) 

	The frequency measurement is not very accurate, particularly for
	the Spyder 3, 4 & 5, being too low by about 3.5%.
	
 */

/* 
   If you make use of the instrument driver code here, please note
   that it is the author(s) of the code who take responsibility
   for its operation. Any problems or queries regarding driving
   instruments with the Argyll drivers, should be directed to
   the Argyll's author(s), and not to any other party.

   If there is some instrument feature or function that you
   would like supported here, it is recommended that you
   contact Argyll's author(s) first, rather than attempt to
   modify the software yourself, if you don't have firm knowledge
   of the instrument communicate protocols. There is a chance
   that an instrument could be damaged by an incautious command
   sequence, and the instrument companies generally cannot and
   will not support developers that they have not qualified
   and agreed to support.
 */

/* TTBD:

	Would be good to add read/write data values if debug >= 3
*/

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <time.h>
#include <stdarg.h>
#include <math.h>
#include <fcntl.h>
#ifndef SALONEINSTLIB
#include "copyright.h"
#include "aconfig.h"
#include "numlib.h"
#else /* SALONEINSTLIB */
#include "sa_config.h"
#include "numsup.h"
#endif /* SALONEINSTLIB */
#include "xspect.h"
#include "insttypes.h"
#include "conv.h"
#include "icoms.h"
#include "spyd2.h"

#undef PLOT_SPECTRA			/* Plot the sensor senitivity spectra */
#undef PLOT_SPECTRA_EXTRA	/* Plot the sensor senitivity spectra extra values */
#undef SAVE_SPECTRA			/* Save the sensor senitivity spectra to "sensors.cmf" */
#undef SAVE_XYZSPECTRA		/* Save the XYZ senitivity spectra to "sensorsxyz.cmf" (scale 1.4) */
#undef SAVE_STDXYZ			/* save 1931 2 degree to stdobsxyz.cmf */


#define DO_RESETEP				/* Do the miscelanous resetep()'s */
#define CLKRATE 1000000			/* Clockrate the Spyder 2 hardware runs at */
#define MSECDIV (CLKRATE/1000)	/* Divider to turn clocks into msec */
#define DEFRRATE 50				/* Default display refresh rate */
#define DO_ADAPTIVE				/* Adapt the integration time to the light level */
								/* This helps repeatability at low levels A LOT */

#define LEVEL2					/* Second level (nonliniarity) calibration */
#define RETRIES 4				/* usb_reads are unreliable - bug in spyder H/W ?*/

#ifdef DO_ADAPTIVE
# define RINTTIME 2.0			/* Base time to integrate reading over - refresh display */ 
# define NINTTIME 2.0			/* Base time to integrate reading over - non-refresh display */ 
#else /* !DO_ADAPTIVE */
# define RINTTIME 5.0			/* Integrate over fixed longer time (manufacturers default) */ 
# define NINTTIME 5.0			/* Integrate over fixed longer time (manufacturers default) */ 
#endif /* !DO_ADAPTIVE */

static inst_code spyd2_interp_code(inst *pp, int ec);

/* ------------------------------------------------------------------------ */
/* Implementation */

/* Interpret an icoms error into a SPYD2 error */
static int icoms2spyd2_err(int se) {
	if (se != ICOM_OK)
		return SPYD2_COMS_FAIL;
	return SPYD2_OK;
}

/* ----------------------------------------------------- */
/* Big endian wire format conversion routines */

/* Take an int, and convert it into a byte buffer big endian */
static void int2buf(unsigned char *buf, int inv) {
	buf[0] = (unsigned char)(inv >> 24) & 0xff;
	buf[1] = (unsigned char)(inv >> 16) & 0xff;
	buf[2] = (unsigned char)(inv >> 8) & 0xff;
	buf[3] = (unsigned char)(inv >> 0) & 0xff;
}

/* Take a short, and convert it into a byte buffer big endian */
static void short2buf(unsigned char *buf, int inv) {
	buf[0] = (unsigned char)(inv >> 8) & 0xff;
	buf[1] = (unsigned char)(inv >> 0) & 0xff;
}

/* Take a short sized buffer, and convert it to an int big endian */
static int buf2short(unsigned char *buf) {
	int val;
	val = buf[0];
	val = ((val << 8) + (0xff & buf[1]));
	return val;
}

/* Take a unsigned short sized buffer, and convert it to an int big endian */
static int buf2ushort(unsigned char *buf) {
	int val;
	val =               (0xff & buf[0]);
	val = ((val << 8) + (0xff & buf[1]));
	return val;
}

/* Take a unsigned short sized buffer, and convert it to an int little endian */
static int buf2uleshort(unsigned char *buf) {
	int val;
	val =               (0xff & buf[1]);
	val = ((val << 8) + (0xff & buf[0]));
	return val;
}

/* Take a word sized buffer, and convert it to an int big endian. */
static int buf2int(unsigned char *buf) {
	int val;
	val =                       buf[0];
	val = ((val << 8) + (0xff & buf[1]));
	val = ((val << 8) + (0xff & buf[2]));
	val = ((val << 8) + (0xff & buf[3]));
	return val;
}

/* Take a word sized buffer, and convert it to an unsigned int big endian. */
static unsigned int buf2uint(unsigned char *buf) {
	unsigned int val;
	val =                       buf[0];
	val = ((val << 8) + (0xff & buf[1]));
	val = ((val << 8) + (0xff & buf[2]));
	val = ((val << 8) + (0xff & buf[3]));
	return val;
}


/* Take a 3 byte buffer, and convert it to an unsigned int big endian. */
static unsigned int buf2uint24(unsigned char *buf) {
	unsigned int val;
	val =                       buf[0];
	val = ((val << 8) + (0xff & buf[1]));
	val = ((val << 8) + (0xff & buf[2]));
	return val;
}

/* Take a 24 bit unsigned sized buffer in little endian */
/* format, and return an int */
static unsigned int buf2uint24le(unsigned char *buf) {
	unsigned int val;
	val =               (0xff & buf[2]);
	val = ((val << 8) + (0xff & buf[1]));
	val = ((val << 8) + (0xff & buf[0]));
	return val;
}

/* Take a 24 bit unsigned sized buffer in little endian */
/* nibble swapped format, and return an int */
static unsigned int buf2uint24lens(unsigned char *buf) {
	unsigned int val;
	val =              (0xf &  buf[2]);
	val = (val << 4) + (0xf & (buf[2] >> 4));
	val = (val << 4) + (0xf &  buf[1]);
	val = (val << 4) + (0xf & (buf[1] >> 4));
	val = (val << 4) + (0xf &  buf[0]);
	val = (val << 4) + (0xf & (buf[0] >> 4));
	return val;
}

/* Take a 64 sized return buffer, and convert it to a ORD64 */
static ORD64 buf2ord64(unsigned char *buf) {
	ORD64 val;
	val = buf[7];
	val = ((val << 8) + (0xff & buf[6]));
	val = ((val << 8) + (0xff & buf[5]));
	val = ((val << 8) + (0xff & buf[4]));
	val = ((val << 8) + (0xff & buf[3]));
	val = ((val << 8) + (0xff & buf[2]));
	val = ((val << 8) + (0xff & buf[1]));
	val = ((val << 8) + (0xff & buf[0]));
	return val;
}

/* ============================================================ */
/* Low level commands */


/* USB Instrument commands */

/* Spyder 2: Reset the instrument */
static inst_code
spyd2_reset(
	spyd2 *p
) {
	int se;
	int retr;
	inst_code rv = inst_ok;

	a1logd(p->log, 3, "spyd2_reset: called\n");

	for (retr = 0; ; retr++) {
		se = p->icom->usb_control(p->icom,
		               IUSB_ENDPOINT_OUT | IUSB_REQ_TYPE_VENDOR | IUSB_REQ_RECIP_DEVICE,
	                   0xC7, 0, 0, NULL, 0, 5.0);

		if (se == ICOM_OK) {
			a1logd(p->log, 6, "spyd2_reset: complete, ICOM code 0x%x\n",se);
			break;
		}
		if (retr >= RETRIES ) {
			a1logd(p->log, 1, "spyd2_reset: failed with ICOM err 0x%x\n",se);
			return spyd2_interp_code((inst *)p, icoms2spyd2_err(se));
			break;
		}
		msec_sleep(500);
		a1logd(p->log, 1, "spyd2_reset: reset retry with  ICOM err 0x%x\n",se);
	}

	return rv;
}

/* Spyder 2: Get status */
/* return pointer may be NULL if not needed. */
static inst_code
spyd2_getstatus(
	spyd2 *p,
	int *stat	/* Return the 1 byte status code */
) {
	unsigned char pbuf[8];	/* status bytes read */
	int _stat;
	int se;
	int retr;
	inst_code rv = inst_ok;

	a1logd(p->log, 3, "spyd2_getstatus: called\n");

	for (retr = 0; ; retr++) {
		se = p->icom->usb_control(p->icom,
		               IUSB_ENDPOINT_IN | IUSB_REQ_TYPE_VENDOR | IUSB_REQ_RECIP_DEVICE,
	                   0xC6, 0, 0, pbuf, 8, 5.0);

		if (se == ICOM_OK)
			break;
		if (retr >= RETRIES ) {
			a1logd(p->log, 1, "spyd2_getstatus: failed with ICOM err 0x%x\n",se);
			return spyd2_interp_code((inst *)p, icoms2spyd2_err(se));
		}
		msec_sleep(500);
		a1logd(p->log, 1, "spyd2_getstatus: retry with ICOM err 0x%x\n",se);
	}
	msec_sleep(100);		/* Limit rate status commands can be given */

	_stat = pbuf[0];		/* Only the first byte is examined. */
							/* Other bytes have information, but SW ignores them */

	a1logd(p->log, 3, "spyd2_getstatus: returns %d ICOM err 0x%x\n", _stat, se);

	if (stat != NULL) *stat = _stat;

	return rv;
}

/* Read Serial EEProm bytes (implementation) */
/* Can't read more than 256 in one go */
static inst_code
spyd2_readEEProm_imp(
	spyd2 *p,
	unsigned char *buf,	/* Buffer to return bytes in */
	int addr,	/* Serial EEprom address, 0 - 1023 */
	int size	/* Number of bytes to read, 0 - 128 (ie. max of  bank) */
) {
	int se;
	int retr;
	inst_code rv = inst_ok;

	a1logd(p->log, 3, "spyd2_readEEProm_imp: addr %d, bytes %d\n",addr,size);

	if (addr < 0
	 || (p->hwver < 7 && (addr + size) > 512)
	 || (p->hwver >= 7 && (addr + size) > 1024))
		return spyd2_interp_code((inst *)p, SPYD2_BAD_EE_ADDRESS);

	if (size >= 256)
		return spyd2_interp_code((inst *)p, SPYD2_BAD_EE_SIZE);

	for (retr = 0; ; retr++) {
		se = p->icom->usb_control(p->icom,
			               IUSB_ENDPOINT_IN | IUSB_REQ_TYPE_VENDOR | IUSB_REQ_RECIP_DEVICE,
		                   0xC4, addr, size, buf, size, 5.0);
		if (se == ICOM_OK)
			break;
		if (retr >= RETRIES) {
			a1logd(p->log, 1, "spyd2_readEEProm_imp: failed with ICOM err 0x%x\n",se);
			return spyd2_interp_code((inst *)p, icoms2spyd2_err(se));
		}
		msec_sleep(500);
		a1logd(p->log, 1, "spyd2_readEEProm_imp: retry with ICOM err 0x%x\n",se);
	}


	a1logd(p->log, 3, "spyd2_readEEProm_imp: returning ICOM err 0x%x\n", se);

	return rv;
}

/* Read Serial EEProm bytes */
/* (Handles reads > 256 bytes) */
static inst_code
spyd2_readEEProm(
	spyd2 *p,
	unsigned char *buf,	/* Buffer to return bytes in */
	int addr,	/* Serial EEprom address, 0 - 511 */
	int size	/* Number of bytes to read, 0 - 511 */
) {

	if (addr < 0
	 || (p->hwver < 7 && (addr + size) > 512)
	 || (p->hwver >= 7 && (addr + size) > 1024))
		return spyd2_interp_code((inst *)p, SPYD2_BAD_EE_ADDRESS);
	
	while (size > 255) {		/* Single read is too big */
		inst_code rv;
		if ((rv = spyd2_readEEProm_imp(p, buf, addr, 255)) != inst_ok)
			return rv;
		size -= 255;
		buf  += 255;
		addr += 255;
	}
	return spyd2_readEEProm_imp(p, buf, addr, size);
}

/* Spyder 2: Download PLD pattern */
static inst_code
spyd2_loadPLD(
	spyd2 *p,
	unsigned char *buf,		/* Bytes to download */
	int size				/* Number of bytes */
) {
	int se;
	int retr;
	inst_code rv = inst_ok;

	a1logd(p->log, 6, "spyd2_loadPLD: Load PLD %d bytes\n",size);

	for (retr = 0; ; retr++) {
		se = p->icom->usb_control(p->icom,
		               IUSB_ENDPOINT_OUT | IUSB_REQ_TYPE_VENDOR | IUSB_REQ_RECIP_DEVICE,
	                   0xC0, 0, 0, buf, size, 5.0);

		if (se == ICOM_OK)
			break;
		if (retr >= RETRIES ) {
			a1logd(p->log, 1, "spyd2_loadPLD: failed with ICOM err 0x%x\n",se);
			return spyd2_interp_code((inst *)p, icoms2spyd2_err(se));
		}
		msec_sleep(500);
		a1logd(p->log, 1, "spyd2_loadPLD: retry with ICOM err 0x%x\n",se);
	}

	a1logd(p->log, 6, "spyd2_loadPLD: returns ICOM err 0x%x\n", se);

	return rv;
}

/* Get minmax command. */
/* Figures out the current minimum and maximum frequency periods */
/* so as to be able to set a frame detect threshold. */
/* Note it returns 0,0 if there is not enough light. */ 
/* (The light to frequency output period size is inversly */
/*  related to the lightness level) */
/* (This isn't used by the manufacturers Spyder3/4 driver, */
/*  but the instrument seems to impliment it.) */
static inst_code
spyd2_GetMinMax(
	spyd2 *p,
	int *clocks,		/* Number of clocks to use (may get limited) */
	int *min,			/* Return min and max light->frequency periods */
	int *max
) {
	int rwbytes;			/* Data bytes read or written */
	int se;
	inst_code rv = inst_ok;
	int value;
	int index;
	int retr;
	unsigned char buf[8];	/* return bytes read */

	a1logd(p->log, 2, "spyd2_GetMinMax: %d clocks\n",*clocks);

	/* Issue the triggering command */
	if (*clocks > 0xffffff)
		*clocks = 0xffffff;		/* Maximum count hardware will take ? */
	value = *clocks >> 8;
	value = (value >> 8) | ((value << 8) & 0xff00);		/* Convert to big endian */
	index = (*clocks << 8) & 0xffff;
	index = (index >> 8) | ((index << 8) & 0xff00);		/* Convert to big endian */

	for (retr = 0; ; retr++) {
		/* Issue the trigger command */
		se = p->icom->usb_control(p->icom,
		               IUSB_ENDPOINT_OUT | IUSB_REQ_TYPE_VENDOR | IUSB_REQ_RECIP_DEVICE,
	                   0xC2, value, index, NULL, 0, 5.0);

		if ((se != ICOM_OK && retr >= RETRIES)) {
			/* Complete the operation so as not to leave the instrument in a hung state */
			msec_sleep(*clocks/MSECDIV);
			p->icom->usb_read(p->icom, NULL, 0x81, buf, 8, &rwbytes, 1.0);

			a1logd(p->log, 1, "spyd2_GetMinMax: trig failed with ICOM err 0x%x\n",se);
			return spyd2_interp_code((inst *)p, icoms2spyd2_err(se));
		}
		if (se != ICOM_OK) {
			/* Complete the operation so as not to leave the instrument in a hung state */
			msec_sleep(*clocks/MSECDIV);
			p->icom->usb_read(p->icom, NULL, 0x81, buf, 8, &rwbytes, 1.0);

			msec_sleep(500);
			a1logd(p->log, 1, "spyd2_GetMinMax: trig retry with ICOM err 0x%x\n",se);
			continue;
		}

		a1logd(p->log, 3, "spyd2_GetMinMax: trig returns ICOM err 0x%x\n", se);
	
		/* Allow some time for the instrument to respond */
		msec_sleep(*clocks/MSECDIV);
	
		/* Now read the bytes */
		se = p->icom->usb_read(p->icom, NULL, 0x81, buf, 8, &rwbytes, 5.0);
		if (se == ICOM_OK)
			break;
		if (retr >= RETRIES) {
			a1logd(p->log, 1, "spyd2_GetMinMax: get failed with ICOM err 0x%x\n",se);
			return spyd2_interp_code((inst *)p, icoms2spyd2_err(se));
		}
		msec_sleep(500);
		a1logd(p->log, 1, "spyd2_GetMinMax: get retry with ICOM err 0x%x\n",se);
	}

	if (rwbytes != 8) {
		a1logd(p->log, 1, "spyd2_GetMinMax: got short data read %d",rwbytes);
		return spyd2_interp_code((inst *)p, SPYD2_BADREADSIZE);
	}

	*min = buf2ushort(&buf[0]);
	*max = buf2ushort(&buf[2]);

	a1logd(p->log, 3, "spyd2_GetMinMax: got %d/%d returns ICOM err 0x%x\n", *min, *max, se);

	return rv;
}

/* Get refresh rate (low level) command */
/* (This isn't used by the manufacturers Spyder3 driver, */
/*  but the instrument seems to implement it.) */
static inst_code
spyd2_GetRefRate_ll(
	spyd2 *p,
	int *clocks,		/* Maximum number of clocks to use */
	int nframes,		/* Number of frames to count */
	int thresh,			/* Frame detection threshold */
	int *minfclks,		/* Minimum number of clocks per frame */
	int *maxfclks,		/* Maximum number of clocks per frame */
	int *clkcnt			/* Return number of clocks for nframes frames */
) {
	int rwbytes;			/* Data bytes read or written */
	int se;
	inst_code rv = inst_ok;
	int value;
	int index;
	int flag;
	int retr;
	unsigned char buf1[8];	/* send bytes */
	unsigned char buf2[8];	/* return bytes read */

	a1logd(p->log, 3, "spyd2_GetRefRate_ll: %d clocks\n",*clocks);

	/* Setup the triggering parameters */
	if (*clocks > 0xffffff)		/* Enforce hardware limits */
		*clocks = 0xffffff;
	if (*minfclks > 0x7fff)
		*minfclks = 0x7fff;
	if (*maxfclks > 0x7fff)
		*maxfclks = 0x7fff;
	value = *clocks >> 8;
	value = (value >> 8) | ((value << 8) & 0xff00);		/* Convert to big endian */
	index = (*clocks << 8) & 0xffff;
	index = (index >> 8) | ((index << 8) & 0xff00);		/* Convert to big endian */

	/* Setup parameters in send buffer */
	short2buf(&buf1[0], thresh);
	short2buf(&buf1[2], nframes);
	short2buf(&buf1[4], *minfclks);
	short2buf(&buf1[6], *maxfclks);

	/* Issue the triggering command */
	for (retr = 0; ; retr++) {
		se = p->icom->usb_control(p->icom,
		               IUSB_ENDPOINT_OUT | IUSB_REQ_TYPE_VENDOR | IUSB_REQ_RECIP_DEVICE,
	                   0xC3, value, index, buf1, 8, 5.0);

		if (se != ICOM_OK && retr >= RETRIES) {
			/* Complete the operation so as not to leave the instrument in a hung state */
			msec_sleep(*clocks/MSECDIV);
			p->icom->usb_read(p->icom, NULL, 0x81, buf2, 8, &rwbytes, 1.0);

			a1logd(p->log, 1, "spyd2_GetRefRate_ll: trig failed with ICOM err 0x%x\n",se);
			return spyd2_interp_code((inst *)p, icoms2spyd2_err(se));
		}
		if (se != ICOM_OK) {
			/* Complete the operation so as not to leave the instrument in a hung state */
			msec_sleep(*clocks/MSECDIV);
			p->icom->usb_read(p->icom, NULL, 0x81, buf2, 8, &rwbytes, 1.0);

			msec_sleep(500);
			a1logd(p->log, 1, "spyd2_GetRefRate_ll: trig retry with ICOM err 0x%x\n",se);
			continue;
		}

		a1logd(p->log, 3, "spyd2_GetRefRate_ll: trig returns ICOM err 0x%x\n", se);

		/* Allow some time for the instrument to respond */
		msec_sleep(*clocks/MSECDIV);
	
		/* Now read the bytes */
		se = p->icom->usb_read(p->icom, NULL, 0x81, buf2, 8, &rwbytes, 5.0);
		if (se == ICOM_OK)
			break;
		if (retr >= RETRIES) {
			a1logd(p->log, 3, "spyd2_GetRefRate_ll: get failed with ICOM err 0x%x\n",se);
			return spyd2_interp_code((inst *)p, icoms2spyd2_err(se));
		}
		msec_sleep(500);
		a1logd(p->log, 1, "spyd2_GetRefRate_ll: get retry with ICOM err 0x%x\n",se);
	}

	if (rwbytes != 8) {
		a1logd(p->log, 1, "spyd2_GetRefRate_ll: got short data read %d",rwbytes);
		return spyd2_interp_code((inst *)p, SPYD2_BADREADSIZE);
	}

	flag = buf2[0];
	*clkcnt = buf2uint24(&buf2[1]);

	/* Spyder2 */
	if (p->hwver < 4 && flag == 1) {
		a1logd(p->log, 1, "spyd2_GetRefRate_ll: got trigger timeout");
		return spyd2_interp_code((inst *)p, SPYD2_TRIGTIMEOUT);
	}

	/* Spyder2 */
	if (p->hwver < 4 && flag == 2) {
		a1logd(p->log, 1, "spyd2_GetRefRate_ll: got overall timeout");
		return spyd2_interp_code((inst *)p, SPYD2_OVERALLTIMEOUT);
	}

	a1logd(p->log, 3, "spyd2_GetRefRate_ll: result  %d, returns ICOM err 0x%x\n", *clkcnt, se);

	return rv;
}

/* Get a reading (low level) command */
static inst_code
spyd2_GetReading_ll(
	spyd2 *p,
	int *clocks,		/* Nominal/Maximum number of integration clocks to use */
	int nframes,		/* Number of refresh frames being measured (not used ?) */
	int thresh,			/* Frame detection threshold */
	int *minfclks,		/* Minimum number of clocks per frame */
	int *maxfclks,		/* Maximum number of clocks per frame */
	double *sensv,		/* Return the 8 sensor readings (may be NULL) */ 
	int *maxtcnt,		/* Return the maximum transition count (may be NULL) */
	int *mintcnt		/* Return the minimum transition count (may be NULL) */
) {
	int rwbytes;			/* Data bytes read or written */
	int se;
	inst_code rv = inst_ok;
	int value;
	int index;
	int flag;
	int retr;
	unsigned char buf1[8];		/* send bytes */
	unsigned char buf2[9 * 8];	/* return bytes read */
	int rvals[3][8];			/* Raw values */
	int _maxtcnt = 0;			/* Maximum transition count */
	int _mintcnt = 0x7fffffff;	/* Minumum transition count */
	double maxfreq = 0.0;		/* Maximum sensor frequency found */
	int i, j, k;

	a1logd(p->log, 3, "spyd2_GetReading_ll: clocks = %d, minfc = %d, maxfc = %d\n",*clocks,*minfclks,*maxfclks);

	/* Setup the triggering parameters */
	if (*clocks > 0xffffff)
		*clocks = 0xffffff;
	if (*minfclks > 0x7fff)
		*minfclks = 0x7fff;
	if (*maxfclks > 0x7fff)
		*maxfclks = 0x7fff;
	value = *clocks >> 8;
	if (p->hwver == 5) {		/* Hmm. not sure if this is right */
		value /= 1000;
	}
	value = (value >> 8) | ((value << 8) & 0xff00);		/* Convert to big endian */
	index = (*clocks << 8) & 0xffff;
	index = (index >> 8) | ((index << 8) & 0xff00);		/* Convert to big endian */

	/* Setup parameters in send buffer */
	/* (Spyder3 doesn't seem to use these. Perhaps it does its */
	/* own internal refresh detection and syncronization ?) */
	thresh *= 256;
	int2buf(&buf1[0], thresh);
	short2buf(&buf1[4], *minfclks);
	short2buf(&buf1[6], *maxfclks);

	/* If we aborted a read, the prevraw values are now invalid. */
	/* We fix it by doing a dumy reading. */
	if (p->hwver < 4 && p->prevrawinv) {
		int clocks = 500;
		int minfclks = 0;
		int maxfclks = 0;
		p->prevrawinv = 0;
		a1logd(p->log, 3, "spyd2_GetReading_ll: doing dummy read to get prevraw\n");
		if ((rv = spyd2_GetReading_ll(p, &clocks, 10, 0, &minfclks, &maxfclks, NULL, NULL, NULL)) != inst_ok) {
			a1logd(p->log, 1, "spyd2_GetReading_ll: dummy read failed\n");
			p->prevrawinv = 1;
			return rv;
		}
	}

	/* The Spyder comms seems especially flakey... */
	for (retr = 0; ; retr++) {

//int start = msec_time();

		/* Issue the triggering command */
		se = p->icom->usb_control(p->icom,
		               IUSB_ENDPOINT_OUT | IUSB_REQ_TYPE_VENDOR | IUSB_REQ_RECIP_DEVICE,
	                   0xC1, value, index, buf1, 8, 5.0);

		if (se != ICOM_OK && retr >= RETRIES) {
			/* Complete the operation so as not to leave the instrument in a hung state */
			msec_sleep(*clocks/MSECDIV);
			for (i = 0; i < (1+9); i++)
				p->icom->usb_read(p->icom, NULL, 0x81, buf2, 8, &rwbytes, 1.0);
			p->prevrawinv = 1;		/* prevraw are now invalid */

			a1logd(p->log, 1, "spyd2_GetReading_ll: trig failed with ICOM err 0x%x\n",se);
			return spyd2_interp_code((inst *)p, icoms2spyd2_err(se));
		}
		if (se != ICOM_OK) {
			/* Complete the operation so as not to leave the instrument in a hung state */
			msec_sleep(*clocks/MSECDIV);
			for (i = 0; i < (1+9); i++)
				p->icom->usb_read(p->icom, NULL, 0x81, buf2, 8, &rwbytes, 1.0);
			p->prevrawinv = 1;		/* prevraw are now invalid */

			msec_sleep(500);
			a1logd(p->log, 1, "spyd2_GetReading_ll: trig retry with ICOM err 0x%x\n",se);
			continue;
		}

		a1logd(p->log, 3, "spyd2_GetReading_ll: reading returns ICOM code 0x%x\n", se);

		/* Allow some time for the instrument to respond */
		msec_sleep(*clocks/MSECDIV);
	
		/* Now read the first 8 bytes (status etc.) */
		se = p->icom->usb_read(p->icom, NULL, 0x81, buf2, 8, &rwbytes, 5.0);
		if (se != ICOM_OK && retr >= RETRIES) {
			a1logd(p->log, 1, "spyd2_GetReading_ll: read stat failed with ICOM err 0x%x\n",se);
			/* Complete the operation so as not to leave the instrument in a hung state */
			for (i = 0; i < (1+9); i++)
				p->icom->usb_read(p->icom, NULL, 0x81, buf2, 8, &rwbytes, 0.5);
			p->prevrawinv = 1;		/* prevraw are now invalid */
			msec_sleep(500);

			return spyd2_interp_code((inst *)p, icoms2spyd2_err(se));
		}
//printf("~1 trig -> read = %d msec\n",msec_time() - start);

		if (se != ICOM_OK) {
			a1logd(p->log, 1, "spyd2_GetReading_ll: read stat retry with ICOM err 0x%x\n", se);
			/* Complete the operation so as not to leave the instrument in a hung state */
			for (i = 0; i < (1+9); i++)
				p->icom->usb_read(p->icom, NULL, 0x81, buf2, 8, &rwbytes, 0.5);
			p->prevrawinv = 1;		/* prevraw are now invalid */
			msec_sleep(500);
			continue;		/* Retry the whole command */
		}

		if (rwbytes != 8) {
			a1logd(p->log, 1, "spyd2_GetReading_ll: read stat got short data read %d",rwbytes);
			/* Complete the operation so as not to leave the instrument in a hung state */
			for (i = 0; i < (1+9); i++)
				p->icom->usb_read(p->icom, NULL, 0x81, buf2, 8, &rwbytes, 0.5);
			p->prevrawinv = 1;		/* prevraw are now invalid */
			msec_sleep(500);

			return spyd2_interp_code((inst *)p, SPYD2_BADREADSIZE);
		}
	
		flag = buf2[0];

		/* Spyder2 */
		if (p->hwver < 4 && flag == 1) {
			a1logd(p->log, 1, "spyd2_GetReading_ll: read stat is trigger timeout");
			return spyd2_interp_code((inst *)p, SPYD2_TRIGTIMEOUT);
		}

		/* Spyder2 */
		if (p->hwver < 4 && flag == 2) {
			a1logd(p->log, 1, "spyd2_GetReading_ll: read stat is overall timeout");
			return spyd2_interp_code((inst *)p, SPYD2_OVERALLTIMEOUT);
		}

		/* Now read the following 9 x 8 bytes of sensor data */
		for (i = 0; i < 9; i++) {

			se = p->icom->usb_read(p->icom, NULL, 0x81, buf2 + i * 8, 8, &rwbytes, 5.0);
			if (se != ICOM_OK && retr >= RETRIES) {
				int ii = i;
				/* Complete the operation so as not to leave the instrument in a hung state */
				for (; ii < (1+9); ii++)
					p->icom->usb_read(p->icom, NULL, 0x81, buf2 + i * 8, 8, &rwbytes, 0.5);
				p->prevrawinv = 1;		/* prevraw are now invalid */

				a1logd(p->log, 1, "spyd2_GetReading_ll: get reading failed with ICOM err 0x%x\n",se);
				return spyd2_interp_code((inst *)p, icoms2spyd2_err(se));
			}
			if (se != ICOM_OK) {
				int ii = i;
				/* Complete the operation so as not to leave the instrument in a hung state */
				for (; ii < (1+9); ii++)
					p->icom->usb_read(p->icom, NULL, 0x81, buf2 + i * 8, 8, &rwbytes, 0.5);
				p->prevrawinv = 1;		/* prevraw are now invalid */

				break;
			}
			if (rwbytes != 8) {
				int ii = i;
				a1logd(p->log, 1, "spyd2_GetReading_ll: got short data read %d",rwbytes);

				/* Complete the operation so as not to leave the instrument in a hung state */
				for (; ii < (1+9); ii++)
					p->icom->usb_read(p->icom, NULL, 0x81, buf2 + i * 8, 8, &rwbytes, 0.5);
				p->prevrawinv = 1;		/* prevraw are now invalid */

				return spyd2_interp_code((inst *)p, SPYD2_BADREADSIZE);
			}
		}

		if (i >= 9)
			break;		/* We're done */

		msec_sleep(500);
		a1logd(p->log, 1, "spyd2_GetReading_ll: reading retry with ICOM err 0x%x\n",se);

#ifdef DO_RESETEP				/* Do the miscelanous resetep()'s */
		a1logd(p->log, 1, "spyd2_GetReading_ll: resetting end point\n");
		p->icom->usb_resetep(p->icom, 0x81);
		msec_sleep(1);			/* Let device recover ? */
#endif /*  DO_RESETEP */
	}	/* End of whole command retries */

	if (p->log->debug >= 5) {
		a1logd(p->log, 5, "spyd2_GetReading_ll: got bytes:\n");
		for (i = 0; i < 9; i++) {
			a1logd(p->log, 5, " %d: 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x\n",i * 8,
			buf2[i * 8 + 0], buf2[i * 8 + 1], buf2[i * 8 + 2], buf2[i * 8 + 3],
			buf2[i * 8 + 4], buf2[i * 8 + 5], buf2[i * 8 + 6], buf2[i * 8 + 7]);
		}
	}

	/* Spyder 2 decoding */
	/* Spyder2 */
	if (p->hwver < 4) {
		/* Convert the raw buffer readings into 3 groups of 8 integers. */
		/* At the start of each reading, the HW starts counting master */
		/* (1MHz) clocks. When the first transition after the start of */
		/* the reading is received from a light->frequency sensor (TAOS TSL237), */
		/* the clock count is recorded, and returned as the second of the three */
		/* numbers returned for each sensor. */
		/* When the last transition before the end of the reading period is */
		/* received, the clock count is recorded, and returned as the first */
		/* of the three numbers. The integration period is therefore */
		/* the first number minus the second. */
		/* The third number is the number of transitions from the sensor */
		/* counted during the integration period. Since this 24 bit counter is */
		/* not reset between readings, the previous count is recorded (prevraw[]), */
		/* and subtracted (modulo 24 bits) from the current value. */
		/* The light level is directly proportional to the frequency, */
		/* hence the transitions-1 counted. */
		/* In the case of a CRT, the total number of clocks is assumed to be */
		/* set to an integer number of refresh cycles, and the total transitions */
		/* over that period are counted. */
		for (i = j = 0; j < 3; j++) {
			for (k = 0; k < 8; k++, i += 3) {
				rvals[j][k] = buf2uint24lens(buf2 + i);
//				a1logd(p->log, 1, "got rvals[%d][%d] = 0x%x\n",j,k,rvals[j][k]);
			}
		}

		/* And convert 3 values per sensor into sensor values */
		for (k = 0; k < 8; k++) {
			int transcnt, intclks;

			/* Compute difference of L2F count to previous value */
			/* read, modulo 24 bits */
			a1logd(p->log, 5, "%d: transcnt %d, previous %d\n", k,rvals[2][k],p->prevraw[k]);
			if (p->prevraw[k] <= rvals[2][k]) {
				transcnt = rvals[2][k] - p->prevraw[k];
			} else {
				transcnt = rvals[2][k] + 0x1000000 - p->prevraw[k];
			}

			p->prevraw[k] = rvals[2][k];	/* New previuos value */

			/* Compute difference of 1MHz clock count of first to second value */
			intclks = rvals[0][k] - rvals[1][k];

			if (transcnt == 0 || intclks <= 0) {		/* It's too dark ... */
				if (sensv != NULL)
					sensv[k] = 0.0;
				_mintcnt = 0;
			} else {			/* We discard 0'th L2F transion to give transitions */
								/* over the time period. */
				if (sensv != NULL)
					sensv[k] = ((double)transcnt - 1.0) * (double)CLKRATE / (double)intclks;
				if (transcnt > _maxtcnt)
					_maxtcnt = transcnt;
				if (transcnt < _mintcnt)
					_mintcnt = transcnt;
			}
			if (sensv != NULL && sensv[k] > maxfreq)
				maxfreq = sensv[k];
			if (p->log->debug >= 4 && sensv != NULL)
				a1logd(p->log, 4, "%d: initial senv %f from transcnt %d and intclls %d\n",
				                                              k,sensv[k],transcnt,intclks);

#ifdef NEVER	/* This seems to make repeatability worse ??? */
			/* If CRT and bright enough */
			if (sensv != NULL && sensv[k] > 1.5 && p->refrmode != 0) {
				sensv[k] = ((double)transcnt) * (double)p->refrate/(double)nframes;
			}
#endif
		}

	/* Spyder 3/4/5 decoding */
	} else {
		/* Convert the raw buffer readings into 3 groups of 8 integers. */
		/* At the start of each reading, the HW starts counting master */
		/* (1MHz) clocks. When the first transition after the start of */
		/* the reading is received from a light->frequency sensor (TAOS TSL238T), */
		/* the clock count is recorded, and returned as the second of the three */
		/* numbers returned for each sensor. */
		/* When the last transition before the end of the reading period is */
		/* received, the clock count is recorded, and returned as the first */
		/* of the three numbers. The integration period is therefore */
		/* the first number minus the second. */
		/* The third number is the number of transitions from the sensor */
		/* counted during the integration period. */
		/* The light level is directly proportional to the frequency, */
		/* hence the transitions-1 counted. */

		int *map;
//		int nat[8]  = { 0,1,2,3,4,5,6,7 };	/* Natural order */
		int map3[8] = { 0,0,1,2,5,6,7,4 };	/* Map Sp3 sensors into Spyder 2 order */
		int map4[8] = { 0,0,1,2,5,6,7,4 };	/* Map Sp4 sensors into Spyder 2 order */
		int map5[8] = { 1,1,0,5,2,7,6,4 };	/* Map Sp5 sensors into Spyder 2 order */

		map = map3;
		if (p->hwver == 7)
			map = map4;
		else if (p->hwver == 10)
			map = map5;

		for (j = 0; j < 3; j++) {
			for (k = 0; k < 8; k++) {
				rvals[j][k] = buf2uint24le(buf2 + (j * 24 + map[k] * 3));
//				a1logd(p->log, 1, "got rvals[%d][%d] = 0x%x\n",j,k,rvals[j][k]);
			}
		}

		/* And convert 3 integers per sensor into sensor values */
		for (k = 0; k < 8; k++) {
			int transcnt, intclks;

			/* Number of sensor transitions */
			transcnt = rvals[2][k];

			/* Compute difference of first integer to second */
			intclks = rvals[0][k] - rvals[1][k];

			if (transcnt == 0 || intclks <= 0) {		/* It's too dark ... */
				if (sensv != NULL)
					sensv[k] = 0.0;
				_mintcnt = 0;
			} else {			/* Transitions within integration period */
								/* hence one is discarded ? */
				if (sensv != NULL)
					sensv[k] = ((double)transcnt - 1.0) * (double)CLKRATE
					         / ((double)intclks * 8.125);
				if (transcnt > _maxtcnt)
					_maxtcnt = transcnt;
				if (transcnt < _mintcnt)
					_mintcnt = transcnt;
			}
			if (sensv != NULL && (8.125 * sensv[k]) > maxfreq)
				maxfreq = 8.125 * sensv[k];
			if (p->log->debug >= 4 && sensv != NULL)
				a1logd(p->log, 4, "%d: initial senv %f from transcnt %d and intclls %d\n",
				                                             k,sensv[k],transcnt,intclks);
		}
	}

	if (maxtcnt != NULL)
		*maxtcnt = _maxtcnt;
	if (mintcnt != NULL)
		*mintcnt = _mintcnt;

	if (p->log->debug >= 4 && sensv != NULL)
		a1logd(p->log, 4, "Maximum sensor frequency = %f\n",maxfreq);

	/* Problem is that the HW starts loosing count above a certain */
	/* frequency, so we depend on one less bright sensor acting as a canary, */
	/* so we can't make the threshold too low. */
	if (maxfreq > 500000.0) {
		return spyd2_interp_code((inst *)p, SPYD2_TOOBRIGHT);
	}

	return rv;
}

/* Spyder 3: Set the LED */
static inst_code
spyd2_setLED(
	spyd2 *p,
	int mode,			/* LED mode: 0 = off, 1 = pulse, 2 = on */
	double period		/* Pulse period in seconds */
) {
	int se;
	inst_code rv = inst_ok;
	int value;
	int index;
	int retr;
	int ptime;			/* Pulse time, 1 - 255 x 20 msec */

	if (mode < 0)
		mode = 0;
	else if (mode > 2)
		mode = 2;
	ptime = (int)(period/0.02 + 0.5);
	if (ptime < 0)
		ptime = 0;
	else if (ptime > 255)
		ptime = 255;

	if (p->log->debug >= 2) {
		if (mode == 1)
			a1logd(p->log, 3, "spyd2_setLED: set to pulse, %f secs\n",ptime * 0.02);
		else
			a1logd(p->log, 3, "spyd2_setLED: set to %s\n",mode == 0 ? "off" : "on");
	}

	value = mode;				/* Leave little endian */
	index = ptime;

	for (retr = 0; ; retr++) {
		/* Issue the trigger command */
		se = p->icom->usb_control(p->icom,
		               IUSB_ENDPOINT_OUT | IUSB_REQ_TYPE_VENDOR | IUSB_REQ_RECIP_DEVICE,
	                   0xF6, value, index, NULL, 0, 5.0);

		if (se == ICOM_OK) {
			a1logd(p->log, 5, "spyd2_setLED: OK, ICOM code 0x%x\n",se);
			break;
		}
		if (retr >= RETRIES) {
			a1logd(p->log, 1, "spyd2_setLED: failed with ICOM err 0x%x\n",se);
			return spyd2_interp_code((inst *)p, icoms2spyd2_err(se));
		}
		msec_sleep(500);
		a1logd(p->log, 1, "spyd2_setLED: retry with ICOM err 0x%x\n",se);
	}

	return rv;
}


/* Spyder 3: Set the ambient control register */
static inst_code
spyd2_SetAmbReg(
	spyd2 *p,
	int val			/* 8 bit ambient config register value */
) {
	int se;
	inst_code rv = inst_ok;
	int value;
	int retr;

	a1logd(p->log, 3, "spyd2_SetAmbReg: control register to %d\n",val);

	if (val < 0)
		val = 0;
	else if (val > 255)
		val = 255;
	value = val;				/* Leave little endian */

	for (retr = 0; ; retr++) {
		/* Issue the trigger command */
		se = p->icom->usb_control(p->icom,
		               IUSB_ENDPOINT_OUT | IUSB_REQ_TYPE_VENDOR | IUSB_REQ_RECIP_DEVICE,
	                   0xF3, value, 0, NULL, 0, 5.0);

		if (se == ICOM_OK) {
			a1logd(p->log, 5, "spyd2_SetAmbReg: OK, ICOM code 0x%x\n",se);
			break;
		}
		if (retr >= RETRIES) {
			a1logd(p->log, 1, "spyd2_SetAmbReg: failed with  ICOM err 0x%x\n",se);
			return spyd2_interp_code((inst *)p, icoms2spyd2_err(se));
		}
		msec_sleep(500);
		a1logd(p->log, 1, "spyd2_SetAmbReg: retry with ICOM err 0x%x\n",se);
	}

	return rv;
}

/* Spyder3/4/5: Read ambient light timing */
/* The byte value seems to be composed of:
	bits 0,1
	bits 4
*/
static inst_code
spyd2_ReadAmbTiming(
	spyd2 *p,
	int *val	/* Return the 8 bit timing value */
) {
	unsigned char pbuf[1];	/* Timing value read */
	int _val;
	int se;
	int retr;
	inst_code rv = inst_ok;

	a1logd(p->log, 3, "spyd2_ReadAmbTiming: called\n");

	for (retr = 0; ; retr++) {
		se = p->icom->usb_control(p->icom,
		               IUSB_ENDPOINT_IN | IUSB_REQ_TYPE_VENDOR | IUSB_REQ_RECIP_DEVICE,
	                   0xF4, 0, 0, pbuf, 1, 5.0);

		if (se == ICOM_OK)
			break;
		if (retr >= RETRIES) {
			a1logd(p->log, 1, "spyd2_ReadAmbTiming: failed with ICOM err 0x%x\n",se);
			return spyd2_interp_code((inst *)p, icoms2spyd2_err(se));
		}
		msec_sleep(500);
		a1logd(p->log, 1, "spyd2_ReadAmbTiming: retry with ICOM err 0x%x\n",se);
	}

	_val = pbuf[0];

	a1logd(p->log, 5, "spyd2_ReadAmbTiming: returning val %d ICOM err 0x%x\n",_val, se);

	if (val != NULL) *val = _val;

	return rv;
}


/* Spyder3/4/5: Read ambient light channel 0 or 1 */
static inst_code
spyd2_ReadAmbChan(
	spyd2 *p,
	int chan,	/* Ambient channel, 0 or 1 */
	int *val	/* Return the 16 bit channel value */
) {
	unsigned char pbuf[2];	/* Channel value read */
	int _val;
	int se;
	int retr;
	inst_code rv = inst_ok;

	chan &= 1;

	a1logd(p->log, 3, "spyd2_ReadAmbChan: channel %d\n",chan);

	for (retr = 0; ; retr++) {
		se = p->icom->usb_control(p->icom,
		               IUSB_ENDPOINT_IN | IUSB_REQ_TYPE_VENDOR | IUSB_REQ_RECIP_DEVICE,
	                   0xF0 + chan, 0, 0, pbuf, 2, 5.0);

		if (se == ICOM_OK)
			break;
		if (retr >= RETRIES) {
			a1logd(p->log, 2, "spyd2_ReadAmbChan: failed with ICOM err 0x%x\n",se);
			return spyd2_interp_code((inst *)p, icoms2spyd2_err(se));
		}
		msec_sleep(500);
		a1logd(p->log, 2, "spyd2_ReadAmbChan: retry with ICOM err 0x%x\n",se);
	}

	_val = buf2ushort(pbuf);

	a1logd(p->log, 3, "spyd2_ReadAmbChan: chan %d returning %d ICOM err 0x%x\n", chan, _val, se);

	if (val != NULL) *val = _val;

	return rv;
}

/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

/* Spyder3/4/5: Read temperature config */
static inst_code
spyd2_ReadTempConfig(
	spyd2 *p,
	int *val	/* Return the 8 bit config value */
) {
	unsigned char pbuf[1];	/* Config value read */
	int _val;
	int se;
	int retr;
	inst_code rv = inst_ok;

	a1logd(p->log, 3, "spyd2_ReadTempConfig: called\n");

	for (retr = 0; ; retr++) {
		se = p->icom->usb_control(p->icom,
		               IUSB_ENDPOINT_IN | IUSB_REQ_TYPE_VENDOR | IUSB_REQ_RECIP_DEVICE,
	                   0xE1, 0, 0, pbuf, 1, 5.0);

		if (se == ICOM_OK)
			break;
		if (retr >= RETRIES) {
			a1logd(p->log, 1, "spyd2_ReadTempConfig: failed with ICOM err 0x%x\n",se);
			return spyd2_interp_code((inst *)p, icoms2spyd2_err(se));
		}
		msec_sleep(500);
		a1logd(p->log, 1, "spyd2_ReadTempConfig: retry with ICOM err 0x%x\n",se);
	}

	_val = pbuf[0];

	a1logd(p->log, 3, "spyd2_ReadTempConfig: returning %d ICOM err 0x%x\n", _val, se);

	if (val != NULL) *val = _val;

	return rv;
}

/* Spyder 3/4/5: Write Register */
static inst_code
spyd2_WriteReg(
	spyd2 *p,
	int reg,
	int val			/* 8 bit temp config register value */
) {
	int se;
	inst_code rv = inst_ok;
	int value;
	int retr;

	a1logd(p->log, 3, "spyd2_WriteReg: val %d to register %d\n",reg, val);

	if (val < 0)
		val = 0;
	else if (val > 255)
		val = 255;
	value = val;				/* Leave little endian */

	reg &= 0xff;
	value |= (reg << 8);

	for (retr = 0; ; retr++) {
		/* Issue the trigger command */
		se = p->icom->usb_control(p->icom,
		               IUSB_ENDPOINT_OUT | IUSB_REQ_TYPE_VENDOR | IUSB_REQ_RECIP_DEVICE,
	                   0xE2, value, 0, NULL, 0, 5.0);

		if (se == ICOM_OK) {
			a1logd(p->log, 5, "spyd2_WriteReg: OK, ICOM code 0x%x\n",se);
			break;
		}
		if (retr >= RETRIES) {
			a1logd(p->log, 5, "spyd2_WriteReg: failed with  ICOM err 0x%x\n",se);
			return spyd2_interp_code((inst *)p, icoms2spyd2_err(se));
		}
		msec_sleep(500);
		a1logd(p->log, 5, "spyd2_WriteReg: retry with ICOM err 0x%x\n",se);
	}

	return rv;
}


/* Spyder3/4/5: Read Register */
static inst_code
spyd2_ReadRegister(
	spyd2 *p,
	int reg,
	int *pval	/* Return the register value */
) {
	unsigned char pbuf[2];	/* Temp value read */
	int ival;
//	double _val;
	int se;
	int retr;
	inst_code rv = inst_ok;

	reg &= 0xff;

	a1logd(p->log, 3, "spyd2_ReadRegister: register %d\n",reg);

	for (retr = 0; ; retr++) {
		se = p->icom->usb_control(p->icom,
		               IUSB_ENDPOINT_IN | IUSB_REQ_TYPE_VENDOR | IUSB_REQ_RECIP_DEVICE,
	                   0xE0, reg, 0, pbuf, 2, 5.0);

		if (se == ICOM_OK)
			break;
		if (retr >= RETRIES) {
			a1logd(p->log, 1, "spyd2_ReadRegister: failed with ICOM err 0x%x\n",se);
			return spyd2_interp_code((inst *)p, icoms2spyd2_err(se));
		}
		msec_sleep(500);
		a1logd(p->log, 1, "spyd2_ReadRegister: retry with ICOM err 0x%x\n",se);
	}

	ival = buf2ushort(&pbuf[0]);
//	_val = (double)ival * 12.5;		/* Read temperature */

	a1logd(p->log, 1, "spyd2_ReadRegister: reg %d returning %d ICOM err 0x%x\n", ival, rv, se);

	if (pval != NULL) *pval = ival;

	return rv;
}


/* hwver == 5, set gain */
/* Valid gain values 1, 4, 16, 64 */
static inst_code
spyd2_SetGain(
	spyd2 *p,
	int gain
) {
	int gv = 0;

	p->gain = (double)gain;

	switch (gain) {
		case 1:
			gv = 0;
			break;
		case 4:
			gv = 16;
			break;
		case 16:
			gv = 32;
			break;
		case 64:
			gv = 48;
			break;
	}
	return spyd2_WriteReg(p, 7, gv); 
}

/* ============================================================ */
/* Medium level commands */

/* Read a 8 bits from the EEProm */
static inst_code
spyd2_rd_ee_uchar(
	spyd2 *p,				/* Object */
	unsigned int *outp,		/* Where to write value */
	int addr				/* EEprom Address, 0 - 510 */
) {
	inst_code ev;
	unsigned char buf[1];

	if ((ev = spyd2_readEEProm(p, buf, addr, 1)) != inst_ok)
		return ev;

	*outp = buf[0];

	return inst_ok;
}

/* Read a 16 bit word from the EEProm */
static inst_code
spyd2_rd_ee_ushort(
	spyd2 *p,				/* Object */
	unsigned int *outp,		/* Where to write value */
	int addr				/* EEprom Address, 0 - 510 */
) {
	inst_code ev;
	unsigned char buf[2];

	if ((ev = spyd2_readEEProm(p, buf, addr, 2)) != inst_ok)
		return ev;

	*outp = buf2ushort(buf);

	return inst_ok;
}

/* Read a 32 bit word from the EEProm */
static inst_code
spyd2_rd_ee_int(
	spyd2 *p,				/* Object */
	int *outp,				/* Where to write value */
	int addr				/* EEprom Address, 0 - 508 */
) {
	inst_code ev;
	unsigned char buf[4];

	if ((ev = spyd2_readEEProm(p, buf, addr, 4)) != inst_ok)
		return ev;

	*outp = buf2int(buf);

	return inst_ok;
}

/* Read a float from the EEProm */
static inst_code
spyd2_rdreg_float(
	spyd2 *p,				/* Object */
	double *outp,			/* Where to write value */
	int addr				/* Register Address, 0 - 508 */
) {
	inst_code ev;
	int val;

	if ((ev = spyd2_rd_ee_int(p, &val, addr)) != inst_ok)
		return ev;

	*outp = IEEE754todouble((unsigned int)val);
	return inst_ok;
}

unsigned int spyd4_crctab[256];

static void spyd4_crc32_init(void) {
    int i, j;

    unsigned int crc;

    for (i = 0; i < 256; i++) {
        crc = i;
        for (j = 0; j < 8; j++) {
            if (crc & 1)
                crc = (crc >> 1) ^ 0xedb88320;
            else
                crc = crc >> 1;
        }
        spyd4_crctab[i] = crc;
//		a1logd(p->log, 1, "spyd4_crc32_init: crctab[%d] = 0x%08x\n",i,crctab[i]);
    }
}

static unsigned int spyd4_crc32(unsigned char *data, int len) {
    unsigned int        crc;
    int                 i;
    
    crc = ~0;
    for (i = 0; i < len; i++)
		crc = spyd4_crctab[(crc ^ *data++) & 0xff] ^ (crc >> 8);
    return ~crc;
}

/* For HWV 7, check the EEPRom CRC */
static inst_code
spyd2_checkEECRC(
	spyd2 *p				/* Object */
) {
	inst_code ev;
	unsigned char buf[1024], *bp;
	unsigned int crct, crc;			/* Target value, computed value */
	int i;

	spyd4_crc32_init();

	if ((ev = spyd2_readEEProm(p, buf, 0, 1024)) != inst_ok)
		return ev;

	/* Target value */
	crct = buf2uint(buf + 1024 - 4);

	bp = buf;
    crc = ~0;
	for (i = 0; i < (1024 - 4); i++, bp++)
		crc = spyd4_crctab[(crc ^ *bp) & 0xff] ^ (crc >> 8);
    crc = ~crc;

	a1logd(p->log, 4, "spyd2_checkEECRC: EEProm CRC is 0x%x, should be 0x%x\n",crc,crct);

	if (crc != crct)
		return spyd2_interp_code((inst *)p, SPYD2_BAD_EE_CRC);
		
	return inst_ok;
}

/* Special purpose float read, */
/* Read three 9 vectors of floats from the EEprom */
static inst_code
spyd2_rdreg_3x9xfloat(
	spyd2 *p,				/* Object */
	double *out0,			/* Where to write first 9 doubles */
	double *out1,			/* Where to write second 9 doubles */
	double *out2,			/* Where to write third 9 doubles */
	int addr				/* Register Address, 0 - 1023 */
) {
	inst_code ev;
	unsigned char buf[3 * 9 * 4], *bp;
	int i;

	if ((ev = spyd2_readEEProm(p, buf, addr, 3 * 9 * 4)) != inst_ok)
		return ev;

	bp = buf;
	for (i = 0; i < 9; i++, bp +=4, out0++) {
		int val;
		val = buf2int(bp);
		*out0 = IEEE754todouble((unsigned int)val);
	}

	for (i = 0; i < 9; i++, bp +=4, out1++) {
		int val;
		val = buf2int(bp);
		*out1 = IEEE754todouble((unsigned int)val);
	}

	for (i = 0; i < 9; i++, bp +=4, out2++) {
		int val;
		val = buf2int(bp);
		*out2 = IEEE754todouble((unsigned int)val);
	}

	return inst_ok;
}

/* Special purpose short read, */
/* Read 7 x 41 vectors of ints from the EEprom */
static inst_code
spyd2_rdreg_7x41xshort(
	spyd2 *p,				/* Object */
	double sens[7][41],		/* Destination */
	int addr				/* Register Address, 0 - 1023 */
) {
	inst_code ev;
	unsigned char buf[7 * 41 * 2], *bp;
	int i, j;

	if ((ev = spyd2_readEEProm(p, buf, addr, 7 * 41 * 2)) != inst_ok)
		return ev;

	bp = buf;
	for (i = 0; i < 7; i++) {
		for (j = 0; j < 41; j++, bp += 2) {
			int val;
			val = buf2ushort(bp);
			sens[i][j] = val / 100.0;
		}
	}

	return inst_ok;
}

/* Special purpose LE short read, */
/* Read 7 x 41 vectors of Little Endian ints from the EEprom */
static inst_code
spyd2_rdreg_7x41xleshort(
	spyd2 *p,				/* Object */
	double sens[7][41],		/* Destination */
	int addr				/* Register Address, 0 - 1023 */
) {
	inst_code ev;
	unsigned char buf[7 * 41 * 2], *bp;
	int i, j;

	if ((ev = spyd2_readEEProm(p, buf, addr, 7 * 41 * 2)) != inst_ok)
		return ev;

	bp = buf;
	for (i = 0; i < 7; i++) {
		for (j = 0; j < 41; j++, bp += 2) {
			int val;
			val = buf2uleshort(bp);
			sens[i][j] = val / 100.0;
		}
	}

	return inst_ok;
}

/* Get refresh rate command. Set it to 0.0 if not detectable */
/* if no refresh rate can be established */
/* (This isn't used by the manufacturers Spyder3/4 driver, */
/*  but the instrument seems to impliment it.) */
static inst_code
spyd2_read_refrate(
	inst *pp,
	double *ref_rate
) {
	spyd2 *p = (spyd2 *)pp;
	inst_code ev;
	int clocks;			/* Clocks to run commands */
	int min, max;		/* min and max light intensity frequency periods */

	a1logd(p->log, 3, "spyd2_read_refrate: called\n");

	if (ref_rate != NULL)
		*ref_rate = 0.0;

	/* Establish the frame rate detect threshold level */
	clocks = (10 * CLKRATE)/DEFRRATE;

	if ((ev = spyd2_GetMinMax(p, &clocks, &min, &max)) != inst_ok)
		return ev; 

	if (min == 0 || max < (5 * min)) {
		a1logd(p->log, 3, "spyd2_read_refrate: no refresh rate detectable\n");
		if (ref_rate != NULL)
			*ref_rate = 0.0;
		return inst_misread | SPYD2_NO_REFRESH_DET;
	} else {
		int frclocks;		/* notional clocks per frame */
		int nframes;		/* Number of frames to count */
		int thresh;			/* Frame detection threshold */
		int minfclks;		/* Minimum number of clocks per frame */
		int maxfclks;		/* Maximum number of clocks per frame */
		int clkcnt;		/* Return number of clocks for nframes frames */

		frclocks = CLKRATE/DEFRRATE;
		nframes = 50;
		thresh = (max - min)/5 + min;			/* Threshold is at 80% of max brightness */
		minfclks = frclocks/3;					/* Allow for 180 Hz */
		maxfclks = (frclocks * 5)/2;			/* Allow for 24 Hz */
		clocks = nframes * frclocks * 2;		/* Allow for 120 Hz */

		if ((ev = spyd2_GetRefRate_ll(p, &clocks, nframes, thresh, &minfclks, &maxfclks,
		                                 &clkcnt)) != inst_ok)
			return ev; 

		/* Compute the refresh rate */
		if (ref_rate != NULL)
			*ref_rate = ((double)nframes * (double)CLKRATE)/(double)clkcnt;
		return inst_ok;
	}
}

/* Get refresh rate command. Set it to DEFRRATE if not detectable */
/* if no refresh rate can be established */
/* (This isn't used by the manufacturers Spyder3/4 driver, */
/*  but the instrument seems to impliment it.) */
static inst_code
spyd2_GetRefRate(
	spyd2 *p
) {
	int i;
	inst_code ev;

	a1logd(p->log, 3, "Frequency calibration called\n");

	if ((ev = spyd2_read_refrate((inst *)p, &p->refrate)) != inst_ok) {
		p->refrate = DEFRRATE;
		p->refrvalid = 0;
		return ev;
	}
	if (p->refrate != 0.0) {
		a1logd(p->log, 3, "spyd2_GetRefRate: refresh rate is %f Hz\n",p->refrate);
		p->refrvalid = 1;
	} else {
		a1logd(p->log, 3, "spyd2_GetRefRate: no refresh rate detectable\n");
		p->refrate = DEFRRATE;
		p->refrvalid = 0;
	}
	p->rrset = 1;

	return inst_ok;
}

/* Do a reading. */
/* Note that the Spyder 3 seems to give USB errors on the data */
/* read if the measurement time is too small (ie. 0.2 seconds) */
/* when reading dark values. */
static inst_code
spyd2_GetReading(
	spyd2 *p,
	double *XYZ		/* return the XYZ values */
) {
	inst_code ev;
	int clocks1, clocks2;	/* Clocks to run commands */
	int min, max;		/* min and max light intensity frequency periods */
	int frclocks;		/* notional clocks per frame */
	int nframes;		/* Number of frames to measure over */
	int thresh;			/* Frame detection threshold */
	int minfclks;		/* Minimum number of clocks per frame */
	int maxfclks;		/* Maximum number of clocks per frame */
	double sensv[8];	/* The 8 final sensor value readings */
	int maxtcnt;		/* The maximum transition count measured */
	int mintcnt;		/* The minumum transition count measured */
	double a_sensv[8];	/* Accumulated sensor value readings */
	double a_w[8];		/* Accumulated sensor value weight */
	double pows[9];		/* Power combinations of initial XYZ */
	int i, j, k;
	double inttime = 0.0;

	a1logd(p->log, 3, "spyd2_GetReading: called\n");

	if (p->refrmode != 0 && p->rrset != 0) 
		inttime = RINTTIME;		/* ie. 1 second */
	else
		inttime = NINTTIME;		/* ie. 1 second */

	/* Compute number of frames for desired base read time */
	nframes = (int)(inttime * p->refrate + 0.5);

	/* Establish the frame rate detect threshold level */
	/* (The Spyder 3 doesn't use this ?) */
	clocks1 = (int)((nframes * CLKRATE)/(10 * p->refrate) + 0.5);		/* Use 10% of measurement clocks */

	if ((ev = spyd2_GetMinMax(p, &clocks1, &min, &max)) != inst_ok)
		return ev; 

	/* Setup for measurement */
	thresh = (max - min)/5 + min;			/* Threshold is at 80% of max brightness */
	if (thresh == 0)
		thresh = 65535;						/* Set to max, otherwise reading will be 0 */
	frclocks = (int)(CLKRATE/p->refrate + 0.5);	/* Nominal clocks per frame */
	minfclks = frclocks/3;					/* Allow for 180 Hz */
	maxfclks = (frclocks * 5)/2;			/* Allow for 24 Hz */

	if (p->hwver < 7) {
		/* Check calibration is valid */
		if ((p->icx & 1) == 0 && (p->fbits & 1) == 0) {
//			return spyd2_interp_code((inst *)p, SPYD2_NOCRTCAL);
			a1logd(p->log, 1, "spyd2_GetReading: instrument appears to have no CRT calibration "
			                                                     "table! Proceeding anyway..\n");
		}
	
		if ((p->icx & 1) == 1 && (p->fbits & 2) == 0) {
//			return spyd2_interp_code((inst *)p, SPYD2_NOLCDCAL);
			a1logd(p->log, 1, "spyd2_GetReading: instrument appears to have no LCD calibration "
			                                                     "table! Proceeding anyway..\n");
		}
	}

	a1logd(p->log, 3, "spyd2_GetReading: Using cal table %d\n",(p->icx & 1));
	if (p->hwver >= 7)
		a1logd(p->log, 3, "spyd2_GetReading: using spectral cal table %d\n",p->icx >> 1);

	for (k = 0; k < 8; k++) 	/* Zero weighted average */
		a_sensv[k] = a_w[k] = 0.0;

	/* For initial and possible adaptive readings */
	for (i = 0;; i++) {
		double itime;		/* Integration time */

		clocks2 = (int)((double)nframes/p->refrate * (double)CLKRATE + 0.5);

		if ((ev = spyd2_GetReading_ll(p, &clocks2, nframes, thresh, &minfclks, &maxfclks,
		                                 sensv, &maxtcnt, &mintcnt)) != inst_ok)
			return ev; 
//		a1logd(p->log, 3, "spyd2_GetReading: returned number of clocks = %d\n",clocks2);

		if (p->log->debug >= 3) {
			for (k = 0; k < 8; k++)
				a1logd(p->log, 3, "Sensor %d value = %f\n",k,sensv[k]);
		}

		itime = (double)clocks2 / (double)CLKRATE;
//		a1logd(p->log, 3, "spyd2_GetReading: reading %d was %f secs\n",i,itime);

		/* Accumulate it for weighted average */
		for (k = 0; k < 8; k++) {
			if (sensv[k] != 0.0) {		/* Skip value where we didn't get any transitions */
#ifndef NEVER
				/* Accumulate it for weighted average */
				a_sensv[k] += sensv[k] * itime;
				a_w[k] += itime;
#else
				/* Just use the last measurement */
				a_sensv[k] = sensv[k] * itime;
				a_w[k] = itime;
#endif
			}
		}
		
#ifdef DO_ADAPTIVE
		a1logd(p->log, 3, "spyd2_GetReading: Maxtcnt = %d, Mintcnt = %d\n",maxtcnt,mintcnt);
		if (i > 0)
			break;			/* Done adaptive */

		/* Decide whether to go around again */

		if (maxtcnt <= (100/16)) {
			nframes *= 16;			/* Typically 16 seconds */
			a1logd(p->log, 3, "spyd2_GetReading: using maximum integration time\n");
		} else if (maxtcnt < 100) {
			double mulf;
			mulf = 100.0/maxtcnt;
			mulf -= 0.8;			/* Just want to accumulate up to target, not re-do it */
			nframes = (int)(nframes * mulf + 0.5);
			a1logd(p->log, 3, "spyd2_GetReading: increasing total integration time "
			                                               "by %.1f times\n",1+mulf);
		} else {
			break;			/* No need for another reading */
		}
#else /* !DO_ADAPTIVE */
		a1logw(p->log, "!!!! Spyder 2 DO_ADAPTIVE is off !!!!\n");
		break;
#endif /* !DO_ADAPTIVE */
	}

	/* Compute weighted average and guard against silliness */
	for (k = 0; k < 8; k++) {
		if (a_w[k] > 0.0) {
			a_sensv[k] /= a_w[k];
		}
	}

	/* hwver == 5 hasn't been tested... */
	if (p->hwver == 5) {
		double gainscale = 1.0;
		unsigned int v381;

		if ((ev = spyd2_rd_ee_uchar(p, &v381, 381)) != inst_ok)
			return ev; 

		gainscale = (double)v381/p->gain;
		a1logd(p->log, 3, "spyd2_GetReading: hwver5 v381 = %d, gain = %f, gainscale = %f\n",
		                                                         v381,p->gain,gainscale);
		/* Convert sensor readings to XYZ value */
		for (j = 0; j < 3; j++) {
			XYZ[j] = p->cal_A[p->icx & 1][j][0];		/* First entry is a constant */
			for (k = 1; k < 8; k++)
				XYZ[j] += a_sensv[k] * p->cal_A[p->icx & 1][j][k+1] * gainscale;
		}

	} else {
		/* Convert sensor readings to XYZ value */
		for (j = 0; j < 3; j++) {
			XYZ[j] = p->cal_A[p->icx & 1][j][0];		/* First entry is a constant */
			for (k = 1; k < 8; k++) {
				XYZ[j] += a_sensv[k] * p->cal_A[p->icx & 1][j][k+1];
			}
		}
	}

//	a1logd(p->log, 3, "spyd2_GetReading: real Y = %f\n",XYZ[1]);
	a1logd(p->log, 3, "spyd2_GetReading: initial XYZ reading %f %f %f\n",XYZ[0], XYZ[1], XYZ[2]);

#ifdef LEVEL2
	/* Add "level 2" correction factors */
	pows[0] = XYZ[0];
	pows[1] = XYZ[1];
	pows[2] = XYZ[2];
	pows[3] = XYZ[0] * XYZ[1];
	pows[4] = XYZ[0] * XYZ[2];
	pows[5] = XYZ[1] * XYZ[2];
	pows[6] = XYZ[0] * XYZ[0];
	pows[7] = XYZ[1] * XYZ[1];
	pows[8] = XYZ[2] * XYZ[2];


	for (j = 0; j < 3; j++) {
		XYZ[j] = 0.0;

		for (k = 0; k < 9; k++) {
			XYZ[j] += pows[k] * p->cal_B[p->icx & 1][j][k];
		}
	}
	a1logd(p->log, 3, "spyd2_GetReading: 2nd level XYZ reading %f %f %f\n",XYZ[0], XYZ[1], XYZ[2]);
#endif

	/* Protect against silliness (This may stuff up averages though!) */
	for (j = 0; j < 3; j++) {
		if (XYZ[j] < 0.0)
			XYZ[j] = 0.0;
	}
	a1logd(p->log, 3, "spyd2_GetReading: final XYZ reading %f %f %f\n",XYZ[0], XYZ[1], XYZ[2]);

	return ev;
}

/* Spyder3/4/5: Do an ambient reading */

/* NOTE :- the ambient sensor is something like a TAOS TLS 2562CS. */
/* It has two sensors, one wide band and the other infra-red, */
/* the idea being to subtract them to get a rough human response. */
/* The reading is 16 bits, and the 8 bit conrol register */
/* controls gain and integration time: */

/* Bits 0,1 inttime, 0 = scale 0.034, 1 = scale 0.252. 2 = scale 1, 3 = manual */
/* Bit 2, manual, 0 = stop int, 1 = start int */
/* Bit 4, gain, 0 = gain 1, 1 = gain 16 */


static inst_code
spyd2_GetAmbientReading(
	spyd2 *p,
	double *XYZ		/* return the ambient XYZ values */
) {
	inst_code ev = inst_ok;
	int tconf;		/* Ambient timing config */
	int iamb0, iamb1;
	double amb0, amb1;	/* The two ambient values */
	double trv;		/* Trial value */
	double thr[8] = { 64/512.0,  128/512.0, 192/512.0, 256/512.0,	/* Magic tables */
	                  312/512.0, 410/512.0, 666/512.0, 0 };
	double s0[8]  = { 498/128.0, 532/128.0, 575/128.0, 624/128.0,
	                  367/128.0, 210/128.0, 24/128.0,  0 };
	double s1[8]  = { 446/128.0, 721/128.0, 891/128.0, 1022/128.0,
	                  508/128.0, 251/128.0, 18/128.0,  0 };
	double amb;		/* Combined ambient value */
	double sfact;
	int i;

	a1logd(p->log, 3, "spyd2_GetAmbientReading: called\n");

	/* Set the ambient control register to 3 */
	if ((ev = spyd2_SetAmbReg(p, 3)) != inst_ok)
		return ev;

	/* Wait one second */
	msec_sleep(1000);

	/* Read the ambient timing config value */
	if ((ev = spyd2_ReadAmbTiming(p, &tconf)) != inst_ok)
		return ev;
//	a1logd(p->log, 4, "spyd2_GetAmbientReading: timing = %d\n",tconf);

	/* Read the ambient values */
	if ((ev = spyd2_ReadAmbChan(p, 0, &iamb0)) != inst_ok)
		return ev;
	if ((ev = spyd2_ReadAmbChan(p, 1, &iamb1)) != inst_ok)
		return ev;

//	a1logd(p->log, 4, "spyd2_GetAmbientReading: values = %d, %d\n",iamb0,iamb1);
	amb0 = iamb0/128.0;
	amb1 = iamb1/128.0;

	/* Set the ambient control register to 0 */
	if ((ev = spyd2_SetAmbReg(p, 0)) != inst_ok)
		return ev;

	/* Compute the scale factor from the timing config value */
	if ((tconf & 3) == 0)
		sfact = 1.0/0.034;
	else if ((tconf & 3) == 1)
		sfact = 1.0/0.252;
	else
		sfact = 1.0;

	if ((tconf & 0x10) == 0)
		sfact *= 16.0;

	amb0 *= sfact;
	amb1 *= sfact;

	if (amb0 > 0.0)
		trv = amb1/amb0;
	else
		trv = 0.0;
	
	for (i = 0; i < 7; i++) {
		if (trv <= thr[i])
			break;
	}
//	a1logd(p->log, 4, "spyd2_GetAmbientReading: trv = %f, s0 = %f, s1 = %f\n",trv, s0[i],s1[i]);
	/* Compute ambient in Lux */
	amb = s0[i] * amb0 - s1[i] * amb1;
		
//	a1logd(p->log, 4, "spyd2_GetAmbientReading: combined ambient = %f cd/^m\n",amb);

	/* Compute the Y value */
	XYZ[1] = amb;						/* cd/m^2 ??? - not very accurate, due to */
										/* spectral response and/or integration angle ? */
	XYZ[0] = icmD50.X * XYZ[1];			/* Convert to D50 neutral */
	XYZ[2] = icmD50.Z * XYZ[1];

	a1logd(p->log, 3, "spyd2_GetAmbientReading: returning %f %f %f\n",XYZ[0],XYZ[1],XYZ[2]);

	return ev;
}

/* ------------------------------------------------------------ */
/* Spyder 4/5 manufacturer calibration data */
int spyd4_nocals = 0;				/* Number of calibrations */
									/* 6 for Spyder 4 */				
									/* 7 for Spyder 5 */				
xspect *spyd4_cals = NULL;			/* [nocals] Device spectrum */

/* ------------------------------------------------------------ */
/* Spyder4: Create a calibration matrix using the manufacturers */
/* calibration data. */

static inst_code
spyd4_set_cal_ix(
	spyd2 *p,		/* Object */
	int ix			/* Selection, 0 .. spyd4_nocals-1 */ 
) {
	int i, j, k;
	xspect *oc[3];			/* The XYZ observer curves */

	if (ix < 0 || ix >= spyd4_nocals) {
		return spyd2_interp_code((inst *)p, SPYD2_DISP_SEL_RANGE) ;
	} 

	/* The Manufacturers calibration routine computes a least squares */
	/* spectral fit of the sensor spectral sensitivities to the */
	/* standard observer curves, weighted by the white illuminant */
	/* of the display technology. We use the same approach for the */
	/* default calibration selections, to be faithful to the Manufacturers */
	/* intentions. */

	if (p->obType == icxOT_custom) {
		oc[0] = &p->custObserver[0];
		oc[1] = &p->custObserver[1];
		oc[2] = &p->custObserver[2];
	} else {
		if (standardObserver(oc, p->obType)) {
			return spyd2_interp_code((inst *)p, SPYD2_DISP_SEL_RANGE) ;
		}
	}

	/* We compute X,Y & Z independently. */
	for (k = 0; k < 3; k++) {
		double target[81];			/* Spectral target @ 5nm spacing */
		double **wsens;				/* Weighted sensor sensitivities */
		double **psisens;			/* Pseudo inverse of sensitivies */

		/* Load up the observer curve and weight it by the display spectrum */
		/* and mW Lumoinance efficiency factor. */
		for (i = 0; i < 81; i++) {
			double nm = 380.0 + i * 5.0;
			target[i] = value_xspect(&spyd4_cals[ix], nm) * value_xspect(oc[k], nm) * 0.683002;
		}

		/* Load up the sensor curves and weight by the display spectrum */
		wsens = dmatrix(0, 6, 0, 80);
		psisens = dmatrix(0, 80, 0, 6);
		for (j = 0; j < 7; j++) {
			for (i = 0; i < 81; i++) {
				double nm = 380.0 + i * 5.0;
				wsens[j][i] = value_xspect(&spyd4_cals[ix], nm) * value_xspect(&p->sens[j], nm);
			}
		}

		/* Compute the pseudo-inverse matrix */
		if (lu_psinvert(psisens, wsens, 7, 81) != 0) {
			free_dmatrix(wsens, 0, 6, 0, 80);
			free_dmatrix(psisens, 0, 80, 0, 6);
			return spyd2_interp_code((inst *)p, SPYD2_CAL_FAIL) ;
		}

		{
			double *cc, *tt;
			p->cal_A[1][k][0] = 0.0;		/* Offset is zero */
			p->cal_A[1][k][1] = 0.0;		/* Unused is zero */
			cc = &p->cal_A[1][k][2];		/* 7 cal values go here */
			tt = target;
	
			/* Multiply inverse by target to get calibration matrix */
			if (matrix_mult(&cc, 1, 7, &tt, 1, 81, psisens, 81, 7))
				return spyd2_interp_code((inst *)p, SPYD2_CAL_FAIL) ;
			}
//			a1logd(p->log, 3, "Cal %d = %f %f %f %f %f %f %f\n", k, p->cal_A[1][k][2], p->cal_A[1][k][3], p->cal_A[1][k][4], p->cal_A[1][k][5], p->cal_A[1][k][6], p->cal_A[1][k][7], p->cal_A[1][k][8]);
		}

#ifdef PLOT_SPECTRA
	/* Plot the calibrated sensor spectra */
	{
		int i, j, k;
		double xx[81];
		double yy[10][81], *yp[10];

		for (i = 0; i < 81; i++)
			xx[i] = 380.0 + i * 5.0;
	
		for (j = 0; j < 3; j++) {
			for (i = 0; i < 81; i++) {
				yy[j][i] = 0.0;
				for (k = 0; k < 7; k++) {
					yy[j][i] += p->cal_A[1][j][k+2] * value_xspect(&p->sens[k], xx[i]);
				}
			}
			yp[j] = yy[j];
		}
		for (; j < 10; j++)
			yp[j] = NULL;
	
		printf("The calibrated sensor sensitivities\n");
		do_plot10(xx, yp[0], yp[1], yp[2], yp[3], yp[4], yp[5], yp[6], yp[7], yp[8], yp[9], 81, 0);
	}
#endif /* PLOT_SPECTRA */

#ifdef SAVE_XYZSPECTRA		/* Save the default XYZ senitivity spectra to "sensorsxyz.cmf" */
	{
		int i, j, k;
		xspect xyz[3];
		double wl;
	
		for (j = 0; j < 3; j++) {
			xyz[j].spec_n = 81;
			xyz[j].spec_wl_short = 380;
			xyz[j].spec_wl_long = 780;
			xyz[j].norm = 1.0;
			for (i = 0; i < 81; i++) {
				wl = 380.0 + i * 5.0;
				xyz[j].spec[i] = 0.0;
				for (k = 0; k < 7; k++)
					xyz[j].spec[i] += p->cal_A[1][j][k+2] * value_xspect(&p->sens[k], wl);
				xyz[j].spec[i] *= 1.4;	/* Align with std XYZ */
			}
		}
		write_nxspect("sensorsxyz.cmf", xyz, 3, 0);
	}
#endif
#ifdef SAVE_STDXYZ
	{
		xspect xyz[3];
		standardObserver(&xyz[0], &xyz[1], &xyz[2],icxOT_CIE_1931_2);
		write_nxspect("stdobsxyz.cmf", xyz, 3, 0);
	}
#endif /* SAVE_STDXYZ */
	
	return inst_ok;
}


/* The CCSS calibration uses a set of spectral samples, */
/* and a least squares matrix is computed to map the sensor RGB */
/* to the computed XYZ values. This allows better accuracy for */
/* a typical display that has only 3 degrees of freedom, and */
/* allows weigting towards a distribution of actual spectral samples. */
/* Because the typical display has only three degrees of freedom, */
/* while the instrument has 7 sensors, some extra dummy spectral */
/* samples are added to the list to provide some slight extra goal. */

/* [ Given the poor curve shapes that can come out of this, it's not */
/*   clear that it wouldn't be better using the default flat-spetrum */
/*   calibration and computing a 3x3 calibration matrix over the top of it. ] */
static inst_code
spyd4_comp_calmat(
	spyd2 *p,
	icxObserverType obType,	/* XYZ Observer type */
	xspect custObserver[3],	/* Optional custom observer */					\
	xspect *samples,		/* Array of nsamp spectral samples */
	int nsamp				/* Number of real samples */
) {
	int i, j;
	int nasamp = nsamp + 81; /* Number of real + augmented samples */
	double exwt = 1.0;	/* Extra spectral point weight */
	double **sampXYZ;	/* Sample XYZ values */
	double **sampSENS;	/* Sample Sensor values */
	double **isampSENS;	/* Pseudo-inverse of sensor values */
	double **calm;		/* Calibration matrix */
	xsp2cie *conv;
	double wl;
	xspect white;

	if (nsamp < 3)
		return spyd2_interp_code((inst *)p, SPYD2_TOO_FEW_CALIBSAMP);

	/* Create white spectrum samples */
	XSPECT_COPY_INFO(&white, &samples[0]);
	for (j = 0; j < white.spec_n; j++)
		white.spec[j] = 0.0;
	for (i = 0; i < nsamp; i++) {
		for (j = 0; j < white.spec_n; j++)
			if (samples[i].spec[j] > white.spec[j])
				white.spec[j] = samples[i].spec[j];
	}

	/* Compute XYZ of the real sample array. */
	if ((conv = new_xsp2cie(icxIT_none, NULL, obType, custObserver, icSigXYZData, icxClamp)) == NULL)
		return spyd2_interp_code((inst *)p, SPYD2_INT_CIECONVFAIL);
	sampXYZ = dmatrix(0, nasamp-1, 0, 3-1);
	for (i = 0; i < nsamp; i++) {
		conv->convert(conv, sampXYZ[i], &samples[i]); 
//		a1logd(p->log, 3, "asamp[%d] XYZ = %f %f %f\n", i,sampXYZ[nsamp+i][0],sampXYZ[nsamp+i][1], sampXYZ[nsamp+i][2]);
	}

	/* Create extra spectral samples */
	for (i = 0; i < 81; i++) {
		for (j = 0; j < 3; j++) {
			wl = 380.0 + i * 5;
			sampXYZ[nsamp+i][j] = exwt * value_xspect(&white, wl)
			                    * value_xspect(&conv->observer[j], wl) * 0.683002;
		}
//		a1logd(p->log, 3, "asamp[%d] XYZ = %f %f %f\n", i,sampXYZ[nsamp+i][0],sampXYZ[nsamp+i][1], sampXYZ[nsamp+i][2]);
	}
	conv->del(conv);

	sampSENS = dmatrix(0, nasamp-1, 0, 7-1);

	/* Compute sensor values of the sample array */
	for (i = 0; i < nsamp; i++) {
		for (j = 0; j < 7; j++) {
			sampSENS[i][j] = 0.0;
			for (wl = p->sens[0].spec_wl_short; wl <= p->sens[0].spec_wl_long; wl += 1.0) {
				sampSENS[i][j] += value_xspect(&samples[i], wl) * value_xspect(&p->sens[j], wl); 
			}
		}
	}
	/* Create sensor values of the extra sample array */
	for (i = 0; i < 81; i++) {
		for (j = 0; j < 7; j++) {
			wl = 380.0 + i * 5;
			sampSENS[nsamp+i][j] = exwt * value_xspect(&white, wl) * value_xspect(&p->sens[j], wl); 
		}
//		a1logd(p->log, 3, "asamp[%d] Sens = %f %f %f %f %f %f %f\n", i,
//		       sampSENS[nsamp+i][0],sampSENS[nsamp+i][1], sampSENS[nsamp+i][2],
//		       sampSENS[nsamp+i][3],sampSENS[nsamp+i][4], sampSENS[nsamp+i][5],
//		       sampSENS[nsamp+i][6]);
	}
#if defined(PLOT_SPECTRA_EXTRA)
	/* Plot the target extra values */
	{
		int i, j, k;
		double xx[81];
		double yy[10][81], *yp[10];

		for (i = 0; i < 81; i++)
			xx[i] = 380.0 + i * 5;
	
		for (j = 0; j < 3; j++) {
			for (i = 0; i < 81; i++) {
				yy[j][i] = sampXYZ[nsamp+i][j];
			}
			yp[j] = yy[j];
		}
		for (; j < 10; j++)
			yp[j] = NULL;
	
		printf("The target extra XYZ values\n");
		do_plot10(xx, yp[0], yp[1], yp[2], yp[3], yp[4], yp[5], yp[6], yp[7], yp[8], yp[9], 81, 0);

		for (j = 0; j < 7; j++) {
			for (i = 0; i < 81; i++) {
				yy[j][i] = sampSENS[nsamp+i][j];
			}
			yp[j] = yy[j];
		}
		for (; j < 10; j++)
			yp[j] = NULL;
	
		printf("The given extra sensor values\n");
		do_plot10(xx, yp[0], yp[1], yp[2], yp[3], yp[4], yp[5], yp[6], yp[7], yp[8], yp[9], 81, 0);
	}
#endif /* PLOT_SPECTRA_EXTRA */


	isampSENS = dmatrix(0, 7-1, 0, nasamp-1);

	/* Compute the pseudo inverse of sampSENS */
	if (lu_psinvert(isampSENS, sampSENS, nasamp, 7) != 0) {
		free_dmatrix(sampXYZ, 0, nasamp-1, 0, 3-1);
		free_dmatrix(sampSENS, 0, nasamp-1, 0, 7-1);
		free_dmatrix(isampSENS, 0, 7-1, 0, nasamp-1);
		return spyd2_interp_code((inst *)p, SPYD2_CAL_FAIL) ;
	}

	calm = dmatrix(0, 7-1, 0, 3-1);

	/* Multiply inverse by target to get calibration matrix */
	if (matrix_mult(calm, 7, 3, isampSENS, 7, nasamp, sampXYZ, nasamp, 3)) {
		free_dmatrix(sampXYZ, 0, nasamp-1, 0, 3-1);
		free_dmatrix(sampSENS, 0, nasamp-1, 0, 7-1);
		free_dmatrix(isampSENS, 0, 7-1, 0, nasamp-1);
		free_dmatrix(calm, 0, 7-1, 0, 3-1);
		return spyd2_interp_code((inst *)p, SPYD2_CAL_FAIL);
	}

	/* Copy the matrix into place */
	for (i = 0; i < 7; i++) {
		for (j = 0; j < 3; j++) {
			p->cal_A[1][j][2+i] = calm[i][j];
		}
	}

	free_dmatrix(calm, 0, 7-1, 0, 3-1);

#ifdef NEVER

	/* Compute the residuals */
	{
		double **refXYZ;	
		double t1, t2;

		refXYZ = dmatrix(0, nasamp-1, 0, 3-1);

		if (matrix_mult(refXYZ, nasamp, 3, sampSENS, nasamp, 7, calm, 7, 3)) {
			printf("Residual matrix mult failed\n");
		} else {
			t1 = 0.0;
			for (i = 0; i < nsamp; i++) {
				t1 += icmLabDE(refXYZ[i],sampXYZ[i]);
			}
			t1 /= nsamp;
			printf("Average error for sample points = %f\n",t1);
			t2 = 0.0;
			for (i = nsamp; i < (nsamp + 81); i++) {
				t2 += icmLabDE(refXYZ[i],sampXYZ[i]);
//				printf("Resid %d error = %f, %f %f %f, %f %f %f\n",
//				i, icmLabDE(refXYZ[i],sampXYZ[i]), sampXYZ[i][0], sampXYZ[i][1],
//				sampXYZ[i][2], refXYZ[i][0], refXYZ[i][1], refXYZ[i][2]);
			}
			t2 /= 81;
			printf("Average error for extra points = %f\n",t2);
		}
	}
#endif

#ifdef PLOT_SPECTRA
	/* Plot the calibrated sensor spectra */
	{
		int i, j, k;
		double xx[81];
		double yy[10][81], *yp[10];

		for (i = 0; i < 81; i++)
			xx[i] = 380.0 + i * 5.0;
	
		for (j = 0; j < 3; j++) {
			for (i = 0; i < 81; i++) {
				yy[j][i] = 0.0;
				for (k = 0; k < 7; k++) {
					yy[j][i] += p->cal_A[1][j][k+2] * value_xspect(&p->sens[k], xx[i]);
				}
			}
			yp[j] = yy[j];
		}
		for (; j < 10; j++)
			yp[j] = NULL;
	
		printf("The calibrated sensor sensitivities\n");
		do_plot10(xx, yp[0], yp[1], yp[2], yp[3], yp[4], yp[5], yp[6], yp[7], yp[8], yp[9], 81, 0);
	}
#endif /* PLOT_SPECTRA */

	free_dmatrix(sampXYZ, 0, nasamp-1, 0, 3-1);
	free_dmatrix(sampSENS, 0, nasamp-1, 0, 7-1);
	free_dmatrix(isampSENS, 0, 7-1, 0, nasamp-1);

	return inst_ok;
}


/* Preset the calibration to a spectral sample type. */
/* ccmat[][] is set to unity */
static inst_code
spyd2_set_speccal(
	spyd2 *p,
	xspect *samples,	/* Array of nsamp spectral samples, or RGBcmfs for MIbLSr */
	int nsamp			/* Number of samples */
) {
	int i;

	/* Save a the spectral samples to the current state */
	if (p->samples != NULL)
		free(p->samples);
	p->nsamp = 0;
	if ((p->samples = (xspect *)calloc(sizeof(xspect), nsamp)) == NULL) {
		a1loge(p->log, inst_internal_error, "spyd2_set_speccal: malloc failed\n");
		return inst_internal_error;
	}
	for (i = 0; i < nsamp; i++ )
		p->samples[i] = samples[i];		/* Struct copy */
	p->nsamp = nsamp;

	p->icx = (99 << 1) | 1;				/* Out of range index */

	icmSetUnity3x3(p->ccmat);			/* No matrix */

	return inst_ok;
}


/* Preset the calibration to a matrix. The spectral type is set to none */
static inst_code
spyd2_set_matcal(spyd2 *p, double mtx[3][3]) {

	if (p->samples != NULL)
		free(p->samples);
	p->samples = NULL;
	p->nsamp = 0;

	if (mtx == NULL)
		icmSetUnity3x3(p->ccmat);
	else
		icmCpy3x3(p->ccmat, mtx);

	return inst_ok;
}


/* Set the calibration to the currently preset type */
static inst_code
spyd2_set_cal(spyd2 *p) {
	inst_code ev = inst_ok;

	if (p->samples != NULL && p->nsamp > 0) {

		/* Create matrix for specified samples */
		if ((ev = spyd4_comp_calmat(p, p->obType, p->custObserver, p->samples, p->nsamp))
			                                                                          != inst_ok) {
			a1logd(p->log, 1, "spyd2_set_cal: comp_calmat ccss failed with rv = 0x%x\n",ev);
			return ev;
		}

		p->icx = (99 << 1) | 1;			/* Out of range index */
		icmSetUnity3x3(p->ccmat);		/* to be sure to be sure... */

	} else {

		if (p->hwver >= 7) {
			if ((p->icx >> 1) > spyd4_nocals)
				return inst_unsupported; 

			/* Create the calibration matrix from internal spectral data */
			if ((ev = spyd4_set_cal_ix(p, p->icx >> 1)) != inst_ok)
				return ev;
		}

	}

	if (p->log->debug >= 4) {
		int i;
		if (p->hwver >= 7) {
			a1logd(p->log,4,"Spectral calibration matrix:\n");
			for (i = 0; i < 7; i++) {
				a1logd(p->log,4,"        %f %f %f\n",
			                 p->cal_A[1][0][2+i], p->cal_A[1][1][2+i], p->cal_A[1][2][2+i]);
			}
		}
		a1logd(p->log,4,"\n");
		a1logd(p->log,4,"ccmat = %f %f %f\n",
		                 p->ccmat[0][0], p->ccmat[0][1], p->ccmat[0][2]);
		a1logd(p->log,4,"        %f %f %f\n",
		                 p->ccmat[1][0], p->ccmat[1][1], p->ccmat[1][2]);
		a1logd(p->log,4,"        %f %f %f\n\n",
		                 p->ccmat[2][0], p->ccmat[2][1], p->ccmat[2][2]);
		a1logd(p->log,4,"ucbid = %d, cbid = %d\n",p->ucbid, p->cbid);
		a1logd(p->log,4,"\n");
	}

	return inst_ok;
}

/* ------------------------------------------------------------ */

/* Read all the relevant register values */
static inst_code
spyd2_read_all_regs(
	spyd2 *p				/* Object */
) {
	inst_code ev;

	a1logd(p->log, 3, "spyd2_read_all_regs: about to read all the EEProm values\n");

	if (p->log->debug >= 8) {
		unsigned char buf[1024];
		int len = 512;

		if (p->hwver == 7
		 || p->hwver == 10)
			len = 1024;
	
		if ((ev = spyd2_readEEProm(p, buf, 0, len)) != inst_ok)
			return ev;
		a1logd(p->log, 8, "EEPROM:\n"); 
		adump_bytes(p->log, "  ", buf, 0, len);
	}

	/* HW version */
	if ((ev = spyd2_rd_ee_uchar(p, &p->hwver, 5)) != inst_ok)
		return ev;

	/* Feature bits */
	if ((ev = spyd2_rd_ee_uchar(p, &p->fbits, 6)) != inst_ok)
		return ev;

	a1logd(p->log, 3, "spyd2_read_all_regs: hwver+fbits = 0x%02x%02x\n",p->hwver,p->fbits);

	/* Check the EEProm checksum */
	if (p->hwver == 7
	 || p->hwver == 10) {
		if ((ev = spyd2_checkEECRC(p)) != inst_ok) {
			a1logd(p->log, 3, "spyd2_read_all_regs: checksum failed\n");
			return ev;
		}
		a1logd(p->log, 6, "spyd2_read_all_regs: checksum OK\n");
	}

	/* Serial number */
	if ((ev = spyd2_readEEProm(p, (unsigned char *)p->serno, 8, 8)) != inst_ok)
		return ev;
	p->serno[8] = '\000';
	a1logd(p->log, 3, "spyd2_read_all_regs: serno = '%s'\n",p->serno);

	if (p->hwver < 7) {

		/* Hmm. We deliberately ignore the fbits 0, 1 & 2 here, in case they are faulty */
		/* (Not sure if we should look at fbits 1 or not) */

		/* Spyde2: CRT calibration values */
		/* Spyde3: Unknown calibration values */
		if ((ev = spyd2_rdreg_3x9xfloat(p, p->cal_A[0][0], p->cal_A[0][1], p->cal_A[0][2], 16))
		                                                                            != inst_ok)
			return ev;
		if ((ev = spyd2_rdreg_3x9xfloat(p, p->cal_B[0][0], p->cal_B[0][1], p->cal_B[0][2], 128))
		                                                                            != inst_ok)
			return ev;


		/* Hmm. The 0 table seems to sometimes be scaled. Is this a bug ? */
		/* (might be gain factor ?) */
		/* The spyder 3/4 doesn't use this anyway. */
		if (p->hwver >= 4) {
			int j, k, i;
			double avgmag = 0.0;
		
			for (i = j = 0; j < 3; j++) {
				for (k = 0; k < 9; k++) {
					if (p->cal_A[0][j][k] != 0.0) {
						avgmag += fabs(p->cal_A[0][j][k]);
						i++;
					}
				}
			}
			avgmag /= (double)(i);
			a1logd(p->log, 4, "spyd2_read_all_regs: Cal_A avgmag = %f\n",avgmag);

			if (avgmag < 0.05) {
				a1logd(p->log, 5, "spyd2_read_all_regs: Scaling Cal_A by 16\n");
				for (j = 0; j < 3; j++) {
					for (k = 0; k < 9; k++) {
						p->cal_A[0][j][k] *= 16.0;
					}
				}
			}
		}

		/* Spyder2: LCD calibration values */
		/* Spyder3: Normal CRT/LCD calibration values */
		if ((ev = spyd2_rdreg_3x9xfloat(p, p->cal_A[1][0], p->cal_A[1][1], p->cal_A[1][2], 256))
		                                                                            != inst_ok)
			return ev;
		if ((ev = spyd2_rdreg_3x9xfloat(p, p->cal_B[1][0], p->cal_B[1][1], p->cal_B[1][2], 384))
		                                                                            != inst_ok)
			return ev;

		/* The monochrome "TOKIOBLUE" calibration */
		/* (Not sure if this is fbits 2 and 4 or not) */

		/* Luminence only calibration values ??? */
		if ((ev = spyd2_rdreg_float(p, &p->cal_F[0], 240)) != inst_ok)
			return ev;
		if ((ev = spyd2_rdreg_float(p, &p->cal_F[1], 244)) != inst_ok)
			return ev;
		if ((ev = spyd2_rdreg_float(p, &p->cal_F[2], 248)) != inst_ok)
			return ev;
		if ((ev = spyd2_rdreg_float(p, &p->cal_F[3], 252)) != inst_ok)
			return ev;
		if ((ev = spyd2_rdreg_float(p, &p->cal_F[4], 364)) != inst_ok)
			return ev;
		if ((ev = spyd2_rdreg_float(p, &p->cal_F[5], 368)) != inst_ok)
			return ev;
		if ((ev = spyd2_rdreg_float(p, &p->cal_F[6], 372)) != inst_ok)
			return ev;

		if (p->log->debug >= 4) {
			int i, j, k;

			a1logd(p->log, 4, "Cal_A:\n");
			for (i = 0; i < 2;i++) {
				for (j = 0; j < 3; j++) {
					for (k = 0; k < 9; k++) {
						a1logd(p->log, 4, "Cal_A [%d][%d][%d] = %f\n",i,j,k,p->cal_A[i][j][k]);
					}
				}
			}
			a1logd(p->log, 4, "\nCal_B:\n");
			for (i = 0; i < 2;i++) {
				for (j = 0; j < 3; j++) {
					for (k = 0; k < 9; k++) {
						a1logd(p->log, 4, "Cal_B [%d][%d][%d] = %f\n",i,j,k,p->cal_B[i][j][k]);
					}
				}
			}
			a1logd(p->log, 4, "\nCal_F:\n");
			for (i = 0; i < 7;i++) {
				a1logd(p->log, 4, "Cal_F [%d] = %f\n",i,p->cal_F[i]);
			}
			a1logd(p->log, 4, "\n");
		}

	} else if (p->hwver == 7
		    || p->hwver == 10) {
		int i, j;
		unsigned int sscal;
		double tsens[7][41];

		/* Read sensor sensitivity spectral data */
		if (p->hwver == 7) {	/* Spyder 4 */
			if ((ev = spyd2_rdreg_7x41xshort(p, tsens, 0xAA)) != inst_ok)
				return ev;
		} else {				/* Spyder 5 */
			if ((ev = spyd2_rdreg_7x41xleshort(p, tsens, 0x12C)) != inst_ok)
				return ev;
		}

		/* Sensor scale factor */
		if ((ev = spyd2_rd_ee_ushort(p, &sscal, 21)) != inst_ok) 
			return ev;

		/* And apply it to the sensor data */
		for (j = 0; j < 7; j++) {
			for (i = 0; i < 41; i++) {
				tsens[j][i] /= 1000;		/* Convert to Hz per mW/nm/m^2 */
				tsens[j][i] /= sscal/1e5;		/* Sensitivity scale value */
			}
		}

		/* Convert sensor values to xspect's */
		for (i = 0; i < 7; i++) {
			p->sens[i].spec_n = 41;
			p->sens[i].spec_wl_short = 380;
			p->sens[i].spec_wl_long = 780;
			p->sens[i].norm = 1.0;
			for (j = 0; j < 41; j++) {
				p->sens[i].spec[j] = tsens[i][j];
			}
		}
#ifdef SAVE_SPECTRA
		write_nxspect("sensors.cmf", p->sens, 7, 0);
#endif

		/* Linearization */
		if ((ev = spyd2_rdreg_3x9xfloat(p, p->cal_B[1][0], p->cal_B[1][1], p->cal_B[1][2], 60))
		                                                                    != inst_ok)
			return ev;
		
#ifdef PLOT_SPECTRA
	/* Plot the sensor spectra */
	{
		int i, j;
		double xx[81];
		double yy[10][81], *yp[10];

		for (i = 0; i < 81; i++)
			xx[i] = 380.0 + i * 5.0;
	
		for (j = 0; j < 7; j++) {
			for (i = 0; i < 81; i++)
				yy[j][i] = value_xspect(&p->sens[j], xx[i]);
			yp[j] = yy[j];
		}
		for (; j < 10; j++)
			yp[j] = NULL;
	
		printf("The sensor and ambient sensor sensitivy curves\n");
		do_plot10(xx, yp[0], yp[1], yp[2], yp[3], yp[4], yp[5], yp[6], yp[7], yp[8], yp[9], 81, 0);

		for (j = 0; j < spyd4_nocals; j++) {
			double max = 0;
			for (i = 0; i < 81; i++) {
				if (yy[j][i] = value_xspect(&spyd4_cals[j], xx[i]) > max)
					max = value_xspect(&spyd4_cals[j], xx[i]);
			}
			for (i = 0; i < 81; i++)
				yy[j][i] = value_xspect(&spyd4_cals[j], xx[i])/max;
			yp[j] = yy[j];
		}
		for (; j < 10; j++)
			yp[j] = NULL;
	
		printf("The %d display spectra\n",spyd4_nocals);
		do_plot10(xx, yp[0], yp[1], yp[2], yp[3], yp[4], yp[5], yp[6], yp[7], yp[8], yp[9], 81, 0);
	}
#endif /* PLOT_SPECTRA */

	}

	a1logd(p->log, 3, "spyd2_read_all_regs: all EEProm read OK\n");

	return inst_ok;
}

/* ------------------------------------------------------------ */

/* Spyder 1/2 Colorimeter Xilinx XCS05XL firmware pattern */
unsigned int spyder_pld_xsize[2] = { 6817, 6817 };  	/* Expected size */
unsigned int spyder_pld_size[2] = { 0, 0 };  			/* Number of bytes to download */
unsigned char *spyder_pld_bytes[2] = { NULL, NULL };	/* Bytes to download */

/* Spyder 2: Download the PLD if it is available, and check status */
static inst_code
spyd2_download_pld(
	spyd2 *p				/* Object */
) {
	inst_code ev;
	int stat;
	int i;
	int id;

	if (p->itype == instSpyder1)
		id = 0;
	else
		id = 1;

	a1logd(p->log, 2, "spyd2_download_pld: called\n");

	if (spyder_pld_size[id] == 0)		/* Try and read PLD pattern */
		setup_spyd2(id);

	if (spyder_pld_size[id] == 0) {
		a1logd(p->log, 1, "spyd2_download_pld: No PLD pattern available! (have you run oeminst ?)\n");
		return spyd2_interp_code((inst *)p, SPYD2_NO_PLD_PATTERN) ;
	}
		
	for (i = 0; i < spyder_pld_size[id]; i += 8) {
		if ((ev = spyd2_loadPLD(p, spyder_pld_bytes[id] + i, 8)) != inst_ok)
			return ev;
	}

	/* Let the PLD initialize */
	msec_sleep(500);
		
#ifdef DO_RESETEP				/* Do the miscelanous resetep()'s */
	/* Reset the coms */
	p->icom->usb_resetep(p->icom, 0x81);
	msec_sleep(1);			/* Let device recover ? */
#endif /*  DO_RESETEP */

	/* Check the status */
	if ((ev = spyd2_getstatus(p, &stat)) != inst_ok)
		return ev;

	if (stat != 0) {
		a1logd(p->log, 1, "spyd2_download_pld: PLD download failed!\n");
		return spyd2_interp_code((inst *)p, SPYD2_PLDLOAD_FAILED);
	}

	a1logd(p->log, 2, "spyd2_download_pld: PLD download OK\n");

	msec_sleep(500);
#ifdef DO_RESETEP				/* Do the miscelanous resetep()'s */
	p->icom->usb_resetep(p->icom, 0x81);
	msec_sleep(1);			/* Let device recover ? */
#endif /*  DO_RESETEP */

	return inst_ok;
}


/* ------------------------------------------------------------ */
/* Setup Spyder4 native calibrations                            */

/* Load the manufacturers Spyder4 calibration data */
/* Return a SPYD2_ error value */
static int
spyd4_load_cal(spyd2 *p) {
	char **bin_paths = NULL;
	int no_paths = 0;
	unsigned int size;
	unsigned char *buf = NULL;
	FILE *fp = NULL;
	int nocals = 0;
	int i, j;

	/* If already loaded */
	if (spyd4_nocals != 0)
		return SPYD2_OK;


	for (;;) {		/* So we can break */
		if ((no_paths = xdg_bds(NULL, &bin_paths, xdg_data, xdg_read, xdg_user,
			            "ArgyllCMS/spyd4cal.bin" XDG_FUDGE "color/spyd4cal.bin"
			)) < 1)
			break;

		/* open binary file */
#if !defined(O_CREAT) && !defined(_O_CREAT)
# error "Need to #include fcntl.h!"
#endif
#if defined(O_BINARY) || defined(_O_BINARY)
		if ((fp = fopen(bin_paths[0],"rb")) == NULL)
#else
		if ((fp = fopen(bin_paths[0],"r")) == NULL)
#endif
			break;
		xdg_free(bin_paths, no_paths);

		/* Figure out how big file it is */
		if (fseek(fp, 0, SEEK_END)) {
			fclose(fp);
			break;
		}
		size = (unsigned long)ftell(fp);

		if ((size % (41 * 8)) != 0) {
			fclose(fp);
			a1logd(p->log, 1, "spyd4_load_cal: calibration file '%s' is unexpected size\n",bin_paths[0]);
			break;
		}

		nocals = size/(41 * 8);
		if (nocals != 6
		 && nocals != 7) {
			fclose(fp);
			a1logd(p->log, 1, "spyd4_load_cal: calibration file '%s' is unexpected number of calibrations (%d)\n",bin_paths[0],nocals);
			break;
		}

		if (fseek(fp, 0, SEEK_SET)) {
			fclose(fp);
			break;
		}
	
		if ((buf = (unsigned char *)calloc(nocals * 41, 8)) == NULL) {
			fclose(fp);
			return SPYD2_MALLOC;
		}

		if (fread(buf, 1, size, fp) != size) {
			free(buf);
			fclose(fp);
			break;
		}
		fclose(fp);
		break;
	}

	if (buf == NULL)
		nocals = 1;

	if ((spyd4_cals = (xspect *)calloc(nocals, sizeof(xspect))) == NULL) {
		if (buf != NULL)
			free(buf);
		return SPYD2_MALLOC;
	}

	/* If we have calibrations */
	if (buf != NULL) {
		unsigned char *bp;

		for (i = 0; i < nocals; i++) {
			bp = buf + 41 * 8 * i;

			spyd4_cals[i].spec_n = 41;
			spyd4_cals[i].spec_wl_short = 380;
			spyd4_cals[i].spec_wl_long = 780;
			spyd4_cals[i].norm = 1.0;

			for (j = 0; j < 41; j++, bp += 8) {
				ORD64 val;

				val = buf2ord64(bp);
				spyd4_cals[i].spec[j] = IEEE754_64todouble(val);
//				a1logd(p->log, 3, "cal[%d][%d] = %f\n",i,j,spyd4_cals[i].spec[j]);
			}
		}

	} else {

		/* Create a default calibration */
		for (j = 0; j < 41; j++)
			spyd4_cals[0].spec_n = 41;
			spyd4_cals[0].spec_wl_short = 380;
			spyd4_cals[0].spec_wl_long = 780;
			spyd4_cals[0].norm = 1.0;

			for (j = 0; j < 41; j++) {
				spyd4_cals[0].spec[j] = 1.0;
			}
	}

	spyd4_nocals = nocals;

	return SPYD2_OK;
}

/* ============================================================ */


/* Establish communications with a SPYD2 */
/* If it's a serial port, use the baud rate given, and timeout in to secs */
/* Return SPYD2_COMS_FAIL on failure to establish communications */
static inst_code
spyd2_init_coms(inst *pp, baud_rate br, flow_control fc, double tout) {
	spyd2 *p = (spyd2 *) pp;
	int se;
	icomuflags usbflags = icomuf_none;

	a1logd(p->log, 2, "spyd2_init_coms: about to init coms\n");

	if (p->icom->port_type(p->icom) != icomt_usb) {
		a1logd(p->log, 1, "spyd2_init_coms: wrong communications type for device!\n");
		return inst_coms_fail;
	}

	a1logd(p->log, 2, "spyd2_init_coms: about to init USB\n");

	/* On MSWindows the Spyder 3 doesn't work reliably unless each */
	/* read is preceeded by a reset endpoint. */
	/* (!!! This needs checking to see if it's still true. */
	/*  Should switch back to libusb0.sys and re-test.) */
	/* (and Spyder 2 hangs if a reset ep is done on MSWin.) */
	/* The spyder 2 doesn't work well with the winusb driver either, */
	/* it needs icomuf_resetep_before_read to work at all, and */
	/* gets retries anyway. So we use the libusb-win32 driver for it. */
#if defined(NT)
	if (p->itype == instSpyder3) {
		usbflags |= icomuf_resetep_before_read;		/* The spyder USB is buggy ? */
	}
#endif

	/* On OS X the Spyder 2 can't close properly */
#if defined(__APPLE__)			/* OS X*/
	if (p->itype == instSpyder1
	 || p->itype == instSpyder2) {
		usbflags |= icomuf_reset_before_close;		/* The spyder 2 USB is buggy ? */
	}
#endif

#ifdef NEVER	/* Don't want this now that we avoid 2nd set_config on Linux */
#if defined(UNIX_X11)		/* Linux*/
	/* On Linux the Spyder 2 doesn't work reliably unless each */
	/* read is preceeded by a reset endpoint. */
	if (p->itype == instSpyder1
	 || p->itype == instSpyder2) {
		usbflags |= icomuf_resetep_before_read;		/* The spyder USB is buggy ? */
	}
#endif
#endif

	/* Set config, interface, write end point, read end point */
	/* ("serial" end points aren't used - the spyd2lay uses USB control messages) */
	if ((se = p->icom->set_usb_port(p->icom, 1, 0x00, 0x00, usbflags, 0, NULL)) != ICOM_OK) { 
		a1logd(p->log, 1, "spyd2_init_coms: failed ICOM err 0x%x\n",se);
		return spyd2_interp_code((inst *)p, icoms2spyd2_err(se));
	}

	a1logd(p->log, 2, "spyd2_init_coms: suceeded\n");

	p->gotcoms = 1;
	return inst_ok;
}

static inst_code set_default_disp_type(spyd2 *p);

/* Initialise the SPYD2 */
/* return non-zero on an error, with an inst_code */
static inst_code
spyd2_init_inst(inst *pp) {
	spyd2 *p = (spyd2 *)pp;
	inst_code ev = inst_ok;
	int stat;
	int i;

	a1logd(p->log, 2, "spyd2_init_inst: called\n");

	if (p->gotcoms == 0) /* Must establish coms before calling init */
		return spyd2_interp_code((inst *)p, SPYD2_NO_COMS);

	if (p->itype != instSpyder1
	 && p->itype != instSpyder2
	 && p->itype != instSpyder3
	 && p->itype != instSpyder4
	 && p->itype != instSpyder5)
		return spyd2_interp_code((inst *)p, SPYD2_UNKNOWN_MODEL);

	p->refrate = DEFRRATE;
	for (i = 0; i < 8; i++)
		p->prevraw[i] = 0;			/* Internal counters will be reset */
	p->prevrawinv = 0;				/* prevraw is valid */

	/* For Spyder 1 & 2, reset the hardware and wait for it to become ready. */
	if (p->itype != instSpyder3
	 && p->itype != instSpyder4
	 && p->itype != instSpyder5) {

		/* Reset the instrument */
		if ((ev = spyd2_reset(p)) != inst_ok)
			return ev;

		/* Fetch status until we get a status = 1 */
		for (i = 0; i < 50; i++) {
			if ((ev = spyd2_getstatus(p, &stat)) != inst_ok)
				return ev;
	
			if (stat == 1)
				break;
		}
		if (i >= 50)
			return spyd2_interp_code((inst *)p, SPYD2_BADSTATUS);

	} else {
		/* Because the Spyder 3/4/5 doesn't have a reset command, */
		/* it may be left in a borked state if the driver is aborted. */
		/* Make sure there's no old read data hanging around. */
		/* Sometimes it takes a little while for the old data to */
		/* turn up, so try at least for 1 second. */
		/* This won't always work if the driver is re-started */
		/* quickly after aborting a long integration read. */

		unsigned char buf[8];	/* return bytes read */
		int rwbytes;			/* Data bytes read or written */

		
		for (i = 0; i < 10; i++) {
			if ((p->icom->usb_read(p->icom, NULL, 0x81, buf, 8, &rwbytes, 0.1) & ICOM_TO)
			 && i > 9)
				break; 		/* Done when read times out */
		}
	}

	/* Read the Serial EEProm contents */
	if ((ev = spyd2_read_all_regs(p)) != inst_ok)
		return ev;

	/* Spyder 2 */
	if (p->hwver < 4) {
		/* Download the PLD pattern and check the status */
		if ((ev = spyd2_download_pld(p)) != inst_ok)
			return ev;
	}

	p->gain = 1.0;
	if (p->hwver == 5) {
		if ((ev = spyd2_SetGain(p, 4)) != inst_ok)
			return ev;
	}

	/* Set a default calibration */
	if ((ev = set_default_disp_type(p)) != inst_ok) {
		return ev;
	}

	/* Do a dumy sensor read. This will set prevraw[] values.  */
	{
		int clocks = 500;
		int minfclks = 0;
		int maxfclks = 0;
		msec_sleep(100);
		if ((ev = spyd2_GetReading_ll(p, &clocks, 10, 0, &minfclks, &maxfclks, NULL, NULL, NULL)) != inst_ok)
			return ev;
	}

	p->trig = inst_opt_trig_user;		/* default trigger mode */

	p->inited = 1;
	a1logd(p->log, 2, "spyd2_init_inst: inited OK\n");

	if (p->hwver >= 4) {
		/* Flash the LED, just cos we can! */
		if ((ev = spyd2_setLED(p, 2, 0.0)) != inst_ok)
			return ev;
		msec_sleep(200);
		if ((ev = spyd2_setLED(p, 0, 0.0)) != inst_ok)
			return ev;
	}

	a1logv(p->log, 1, "Instrument Type:   %s\n"
		              "Serial Number:     %s\n"
		              "Hardware version:  0x%02x%02x\n"
	                  ,inst_name(p->itype) ,p->serno ,p->hwver,p->fbits);

	return inst_ok;
}

/* Read a single sample */
/* Return the dtp error code */
static inst_code
spyd2_read_sample(
inst *pp,
char *name,			/* Strip name (7 chars) */
ipatch *val,		 /* Pointer to instrument patch value */
instClamping clamp) {		/* NZ if clamp XYZ/Lab to be +ve */
	spyd2 *p = (spyd2 *)pp;
	int user_trig = 0;
	inst_code ev = inst_protocol_error;

	if (!p->gotcoms)
		return inst_no_coms;
	if (!p->inited)
		return inst_no_init;

	if (p->trig == inst_opt_trig_user) {

		if (p->uicallback == NULL) {
			a1logd(p->log, 1, "sptyd2: inst_opt_trig_user but no uicallback function set!\n");
			return inst_unsupported;
		}

		for (;;) {
			if ((ev = p->uicallback(p->uic_cntx, inst_armed)) != inst_ok) {
				if (ev == inst_user_abort)
					return ev;				/* Abort */
				if (ev == inst_user_trig) {
					user_trig = 1;
					break;					/* Trigger */
				}
			}
			msec_sleep(200);
		}
		/* Notify of trigger */
		if (p->uicallback)
			p->uicallback(p->uic_cntx, inst_triggered); 

	/* Progromatic Trigger */
	} else {
		/* Check for abort */
		if (p->uicallback != NULL
		 && (ev = p->uicallback(p->uic_cntx, inst_armed)) == inst_user_abort) {
			return ev;				/* Abort */
		}
	}

	if (IMODETST(p->mode, inst_mode_emis_ambient)) {
		ev = spyd2_GetAmbientReading(p, val->XYZ);

	} else {
		ev = inst_ok;

		/* Attempt a CRT frame rate calibration if needed */
		if (p->refrmode != 0 && p->rrset == 0) 
			ev = spyd2_GetRefRate(p);

		if (ev != inst_ok) {
			warning("Spyder: measuring refresh rate failed");
			ev = inst_ok; 
		}

		if (ev == inst_ok) {
			/* Read the XYZ value */
			if ((ev = spyd2_GetReading(p, val->XYZ)) == inst_ok) {

				/* Apply the colorimeter correction matrix */
				icmMulBy3x3(val->XYZ, p->ccmat, val->XYZ);
			}
		}
	}

	if (ev != inst_ok)
		return ev;


	/* This may not change anything since instrument may clamp */
	if (clamp)
		icmClamp3(val->XYZ, val->XYZ);

	val->loc[0] = '\000';
	if (IMODETST(p->mode, inst_mode_emis_ambient))
		val->mtype = inst_mrt_ambient;
	else
		val->mtype = inst_mrt_emission;
	val->XYZ_v = 1;		/* These are absolute XYZ readings ? */
	val->sp.spec_n = 0;
	val->duration = 0.0;


	if (user_trig)
		return inst_user_trig;
	return ev;
}

/* Make a possible change of the refresh mode */
static void update_refmode(spyd2 *p, int refrmode) {

	if (     IMODETST(p->mode, inst_mode_emis_norefresh_ovd)) {	/* Must test this first! */
		refrmode = 0;
	} else if (IMODETST(p->mode, inst_mode_emis_refresh_ovd)) {
		refrmode = 1;
	}

	if (p->refrmode != refrmode) {
		p->rrset = 0;					/* This is a hint we may have swapped displays */
		p->refrvalid = 0;
	}
	p->refrmode = refrmode; 
}

static inst_code set_base_disp_type(spyd2 *p, int cbid);

/* Insert a colorimetric correction matrix in the instrument XYZ readings */
/* This is only valid for colorimetric instruments. */
/* To remove the matrix, pass NULL for the filter filename */
inst_code spyd2_col_cor_mat(
inst *pp,
disptech dtech,		/* Use disptech_unknown if not known */				\
int cbid,       	/* Calibration display type base ID, 1 if unknown */\
double mtx[3][3]
) {
	spyd2 *p = (spyd2 *)pp;
	inst_code ev = inst_ok;

	if (!p->gotcoms)
		return inst_no_coms;
	if (!p->inited)
		return inst_no_init;

	if ((ev = set_base_disp_type(p, cbid)) != inst_ok)
		return ev;

	p->dtech = dtech;
	update_refmode(p, disptech_get_id(dtech)->refr);
	p->cbid = 0;

	if ((ev = spyd2_set_matcal(p, mtx)) != inst_ok)
		return ev;

	return spyd2_set_cal(p);
}

/* Use a Colorimeter Calibration Spectral Set to set the */
/* instrumen calibration. */
/* This is only valid for colorimetric instruments. */
/* To set calibration back to default, pass NULL for sets. */
inst_code spyd2_col_cal_spec_set(
inst *pp,
disptech dtech,
xspect *sets,
int no_sets
) {
	spyd2 *p = (spyd2 *)pp;
	inst_code ev = inst_ok;

	if (!p->gotcoms)
		return inst_no_coms;
	if (!p->inited)
		return inst_no_init;
	if (p->hwver < 7)
		return inst_unsupported;

	p->dtech = dtech;

	if (sets == NULL || no_sets <= 0) {
		if ((ev = set_default_disp_type(p)) != inst_ok)
			return ev;
	} else {
		if ((ev = spyd2_set_speccal(p, sets, no_sets)) != inst_ok)
			return ev; 

		p->ucbid = 0;			/* We're using external samples */
		ev = spyd2_set_cal(p);
	}
	update_refmode(p, disptech_get_id(dtech)->refr);

	return ev;
}

/* Return needed and available inst_cal_type's */
static inst_code spyd2_get_n_a_cals(inst *pp, inst_cal_type *pn_cals, inst_cal_type *pa_cals) {
	spyd2 *p = (spyd2 *)pp;

	inst_cal_type n_cals = inst_calt_none;
	inst_cal_type a_cals = inst_calt_none;
		
	if (p->refrmode != 0) {
		if (p->rrset == 0)
			n_cals |= inst_calt_ref_freq;
		a_cals |= inst_calt_ref_freq;
	}

	if (pn_cals != NULL)
		*pn_cals = n_cals;

	if (pa_cals != NULL)
		*pa_cals = a_cals;

	return inst_ok;
}

/* Request an instrument calibration. */
/* This is use if the user decides they want to do a calibration, */
/* in anticipation of a calibration (needs_calibration()) to avoid */
/* requiring one during measurement, or in response to measuring */
/* returning inst_needs_cal. Initially us an inst_cal_cond of inst_calc_none, */
/* and then be prepared to setup the right conditions, or ask the */
/* user to do so, each time the error inst_cal_setup is returned. */
static inst_code spyd2_calibrate(
inst *pp,
inst_cal_type *calt,	/* Calibration type to do/remaining */
inst_cal_cond *calc,	/* Current condition/desired condition */
char id[CALIDLEN]		/* Condition identifier (ie. white reference ID) */
) {
	spyd2 *p = (spyd2 *)pp;
	inst_code ev = inst_ok;
    inst_cal_type needed, available;

	if (!p->gotcoms)
		return inst_no_coms;
	if (!p->inited)
		return inst_no_init;

	id[0] = '\000';

	if ((ev = spyd2_get_n_a_cals((inst *)p, &needed, &available)) != inst_ok)
		return ev;

	/* Translate inst_calt_all/needed into something specific */
	if (*calt == inst_calt_all
	 || *calt == inst_calt_needed
	 || *calt == inst_calt_available) {
		if (*calt == inst_calt_all) 
			*calt = (needed & inst_calt_n_dfrble_mask) | inst_calt_ap_flag;
		else if (*calt == inst_calt_needed)
			*calt = needed & inst_calt_n_dfrble_mask;
		else if (*calt == inst_calt_available)
			*calt = available & inst_calt_n_dfrble_mask;

		a1logd(p->log,4,"spyd2_calibrate: doing calt 0x%x\n",calt);

		if ((*calt & inst_calt_n_dfrble_mask) == 0)		/* Nothing todo */
			return inst_ok;
	}

	if ((*calt & inst_calt_ref_freq) && p->refrmode != 0) {

		if ((*calc & inst_calc_cond_mask) != inst_calc_emis_80pc) {
			*calc = inst_calc_emis_80pc;
			return inst_cal_setup;
		}

		/* Do CRT frame rate calibration */
		if ((ev = spyd2_GetRefRate(p)) != inst_ok)
			return ev; 

		*calt &= ~inst_calt_ref_freq;
	}

	return inst_ok;
}

/* Return the last calibrated refresh rate in Hz. Returns: */
static inst_code spyd2_get_refr_rate(inst *pp,
double *ref_rate
) {
	spyd2 *p = (spyd2 *)pp;
	if (p->refrvalid) {

		*ref_rate = p->refrate;
		return inst_ok;
	} else if (p->rrset) {
		*ref_rate = 0.0;
		return inst_misread | SPYD2_NO_REFRESH_DET;
	}
	return inst_needs_cal;
}

/* Set the calibrated refresh rate in Hz. */
/* Set refresh rate to 0.0 to mark it as invalid */
/* Rates outside the range 5.0 to 150.0 Hz will return an error */
static inst_code spyd2_set_refr_rate(inst *pp,
double ref_rate
) {
	spyd2 *p = (spyd2 *)pp;

	if (ref_rate != 0.0 && (ref_rate < 5.0 || ref_rate > 150.0))
		return inst_bad_parameter;

	p->refrate = ref_rate;
	if (ref_rate == 0.0)
		p->refrate = DEFRRATE;
	else
		p->refrvalid = 1;
	p->rrset = 1;

	return inst_ok;
}

/* Error codes interpretation */
static char *
spyd2_interp_error(inst *pp, int ec) {
//	spyd2 *p = (spyd2 *)pp;
	ec &= inst_imask;
	switch (ec) {
		case SPYD2_INTERNAL_ERROR:
			return "Non-specific software internal software error";
		case SPYD2_COMS_FAIL:
			return "Communications failure";
		case SPYD2_UNKNOWN_MODEL:
			return "Not a Spyder 2, 3, 4 or 5";
		case SPYD2_DATA_PARSE_ERROR:
			return "Data from i1 Display didn't parse as expected";

		case SPYD2_OK:
			return "No device error";

		/* device specific errors */
		case SPYD2_BADSTATUS:
			return "Too many retries waiting for status to come good";
		case SPYD2_PLDLOAD_FAILED:
			return "Wrong status after download of PLD";
		case SPYD2_BADREADSIZE:
			return "Didn't read expected amount of data";
		case SPYD2_TRIGTIMEOUT:
			return "Trigger timout";
		case SPYD2_OVERALLTIMEOUT:
			return "Overall timout";
		case SPYD2_BAD_EE_CRC:
			return "Serial EEProm CRC failed";

		/* Internal errors */
		case SPYD2_BAD_EE_ADDRESS:
			return "Serial EEProm read is out of range";
		case SPYD2_BAD_EE_SIZE:
			return "Serial EEProm read size > 256";
		case SPYD2_NO_PLD_PATTERN:
			return "No PLD firmware pattern is available (have you run oeminst ?)";
		case SPYD2_NO_COMS:
			return "Communications hasn't been established";
		case SPYD2_NOT_INITED:
			return "Insrument hasn't been initialised";
		case SPYD2_NOCRTCAL:
			return "Insrument is missing the CRT calibration table";
		case SPYD2_NOLCDCAL:
			return "Insrument is missing the Normal or LCD calibration table";
		case SPYD2_MALLOC:
			return "Memory allocation failure";
		case SPYD2_OBS_SELECT:
			return "Failed to set observer type";
		case SPYD2_CAL_FAIL:
			return "Calibration calculation failed";
		case SPYD2_INT_CIECONVFAIL:
			return "Creating spectral to CIE converted failed";
		case SPYD2_TOO_FEW_CALIBSAMP:
			return "There are too few spectral calibration samples - need at least 3";

		/* Configuration */
		case SPYD2_DISP_SEL_RANGE:
			return "Display device selection out of range";

		/* User error */
		case SPYD2_TOOBRIGHT:
			return "Too bright to read accuractly";
		case SPYD2_NO_REFRESH_DET:
			return "Unable to detect & measure refresh rate";

		default:
			return "Unknown error code";
	}
}


/* Convert a machine specific error code into an abstract dtp code */
static inst_code 
spyd2_interp_code(inst *pp, int ec) {
//	spyd2 *p = (spyd2 *)pp;

	ec &= inst_imask;
	switch (ec) {

		case SPYD2_OK:
			return inst_ok;

		case SPYD2_INTERNAL_ERROR:
		case SPYD2_NO_COMS:
		case SPYD2_NOT_INITED:
		case SPYD2_BAD_EE_ADDRESS:
		case SPYD2_BAD_EE_SIZE:
		case SPYD2_NO_PLD_PATTERN:
		case SPYD2_MALLOC:
		case SPYD2_OBS_SELECT:
		case SPYD2_CAL_FAIL:
		case SPYD2_INT_CIECONVFAIL:
		case SPYD2_TOO_FEW_CALIBSAMP:
			return inst_internal_error | ec;

		case SPYD2_COMS_FAIL:
		case SPYD2_BADREADSIZE:
		case SPYD2_TRIGTIMEOUT:
		case SPYD2_BADSTATUS:
		case SPYD2_OVERALLTIMEOUT:
			return inst_coms_fail | ec;

		case SPYD2_UNKNOWN_MODEL:
			return inst_unknown_model | ec;

//			return inst_protocol_error | ec;

		case SPYD2_NOCRTCAL:
		case SPYD2_NOLCDCAL:
		case SPYD2_PLDLOAD_FAILED:
		case SPYD2_BAD_EE_CRC:
			return inst_hardware_fail | ec;

		case SPYD2_DISP_SEL_RANGE:
			return inst_wrong_setup | ec;

		case SPYD2_TOOBRIGHT:
		case SPYD2_NO_REFRESH_DET:
			return inst_misread | ec;

	}
	return inst_other_error | ec;
}

/* Destroy ourselves */
static void
spyd2_del(inst *pp) {
	spyd2 *p = (spyd2 *)pp;
	if (p->icom != NULL)
		p->icom->del(p->icom);
	inst_del_disptype_list(p->dtlist, p->ndtlist);
	if (p->samples != NULL)
		free(p->samples);
	p->vdel(pp);
	free(p);
}

/* Return the instrument mode capabilities */
static void spyd2_capabilities(inst *pp,
inst_mode *pcap1,
inst2_capability *pcap2,
inst3_capability *pcap3) {
	spyd2 *p = (spyd2 *)pp;
	inst_mode cap1= 0;
	inst2_capability cap2 = 0;

	cap1 |= inst_mode_emis_spot
	     |  inst_mode_emis_refresh_ovd
	     |  inst_mode_emis_norefresh_ovd
	     |  inst_mode_colorimeter
	        ;

	/* We don't seem to have a way of detecting the lack */
	/* of ambinent capability, short of doing a read */
	/* and noticing the result is zero. */
	if (p->itype == instSpyder3
	 || p->itype == instSpyder4
	 || p->itype == instSpyder5) {
		cap1 |= inst_mode_emis_ambient;
	}

	cap2 |= inst2_prog_trig
	     |  inst2_user_trig
	     |  inst2_ccmx
	     |  inst2_get_refresh_rate
	     |  inst2_set_refresh_rate
	     |  inst2_emis_refr_meas
	        ;

	if (p->itype == instSpyder3
	 || p->itype == instSpyder4
	 || p->itype == instSpyder5) {
		cap2 |= inst2_disptype;
		cap2 |= inst2_has_leds;
		cap2 |= inst2_ambient_mono;
	} else {
		cap2 |= inst2_disptype;
	}

	if (p->itype == instSpyder4
	 || p->itype == instSpyder5)
		cap2 |= inst2_ccss;		/* Spyder4 & 5 has spectral sensivities */

	if (pcap1 != NULL)
		*pcap1 = cap1;
	if (pcap2 != NULL)
		*pcap2 = cap2;
	if (pcap3 != NULL)
		*pcap3 = inst3_none;
}

/* Check device measurement mode */
static inst_code spyd2_check_mode(inst *pp, inst_mode m) {
	spyd2 *p = (spyd2 *)pp;
	inst_mode cap;

	if (!p->gotcoms)
		return inst_no_coms;
	if (!p->inited)
		return inst_no_init;

	pp->capabilities(pp, &cap, NULL, NULL);

	/* Simple test */
	if (m & ~cap)
		return inst_unsupported;

	if (!IMODETST(m, inst_mode_emis_spot)
	 && !IMODETST(m, inst_mode_emis_ambient)) {
			return inst_unsupported;
	}

	return inst_ok;
}

/* Set device measurement mode */
static inst_code spyd2_set_mode(inst *pp, inst_mode m) {
	spyd2 *p = (spyd2 *)pp;
	inst_code ev;

	if ((ev = spyd2_check_mode(pp, m)) != inst_ok)
		return ev;

	p->mode = m;

	/* Effective refresh mode may change */
	update_refmode(p, p->refrmode);

	return inst_ok;
}

static inst_disptypesel spyd2_disptypesel[3] = {
	{
		inst_dtflags_default,
		1,
		"l",
		"LCD display",
		0,
		disptech_lcd,
		1
	},
	{
		inst_dtflags_none,			/* flags */
		2,							/* cbid */
		"c",						/* sel */
		"CRT display",				/* desc */
		1,							/* refr */
		disptech_crt,				/* disptype */
		0							/* ix */
	},
	{
		inst_dtflags_end,
		0,
		"",
		"",
		0,
		disptech_none,
		0
	}
};

static inst_disptypesel spyd3_disptypesel[3] = {
	{
		inst_dtflags_default,
		1,
		"nl",
		"Non-Refresh display",
		0,
		disptech_lcd,
		1
	},
	{
		inst_dtflags_none,			/* flags */
		2,							/* cbid */
		"rc",						/* sel */
		"Refresh display",			/* desc */
		1,							/* refr */
		disptech_crt,				/* disptype */
		1							/* ix */
	},
	{
		inst_dtflags_end,
		0,
		"",
		"",
		0,
		disptech_unknown,
		0
	}
};

static inst_disptypesel spyd4_disptypesel_1[8] = {
	{
		inst_dtflags_default,
		1,
		"nl",
		"Generic Non-Refresh Display",
		0,
		disptech_lcd,
		1
	},
	{
		inst_dtflags_none,			/* flags */
		2,							/* cbid */
		"rc",						/* sel */
		"Generic Refresh Display",	/* desc */
		1,							/* refr */
		disptech_crt,				/* disptype */
		1							/* ix */
	},
	{
		inst_dtflags_end,
		0,
		"",
		"",
		0,
		disptech_none,
		0
	}
};

static inst_disptypesel spyd4_disptypesel[8] = {
	{
		inst_dtflags_default,
		1,
		"nl",
		"Generic Non-Refresh Display",
		0,
		disptech_lcd,
		1
	},
	{
		inst_dtflags_none,			/* flags */
		2,							/* cbid */
		"rc",						/* sel */
		"Generic Refresh Display",	/* desc */
		1,							/* refr */
		disptech_crt,				/* disptype */
		1							/* ix = hw bit + spec table << 1 */
	},
	{
		inst_dtflags_none,			/* flags */
		0,
		"f",
		"LCD, CCFL Backlight",
		0,
		disptech_lcd_ccfl,
		(1 << 1) | 1
	},
	{
		inst_dtflags_none,			/* flags */
		0,
		"L",
		"Wide Gamut LCD, CCFL Backlight",
		0,
		disptech_lcd_ccfl_wg,
		(2 << 1) | 1
	},
	{
		inst_dtflags_none,			/* flags */
		0,
		"e",
		"LCD, White LED Backlight",
		0,
		disptech_lcd_wled,
		(3 << 1) | 1
	},
	{
		inst_dtflags_none,			/* flags */
		0,
		"B",
		"Wide Gamut LCD, RGB LED Backlight",
		0,
		disptech_lcd_rgbled,
		(4 << 1) | 1
	},
	{
		inst_dtflags_none,			/* flags */
		0,
		"x",
		"LCD, CCFL Backlight (Laptop ?)",
		0,
		disptech_lcd_ccfl,
		(5 << 1) | 1
	},
	{
		inst_dtflags_end,
		0,
		"",
		"",
		0,
		disptech_none,
		0
	}
};

static void set_base_disptype_list(spyd2 *p) {
	/* set the base display type list */
	if (p->itype == instSpyder4
	 || p->itype == instSpyder5) {
		if (spyd4_nocals <= 1) {
			p->_dtlist = spyd4_disptypesel_1;
		} else {							/* spyd4_nocals == 6 or 7, Spyder 4 or 5. */
			/* Spyder 5 has exactly the same list as the Spyder 4, with an extra */
			/* entry at the end that is the same as the first (flat spectrum). */
			/* So use the spyder 4 list */
			p->_dtlist = spyd4_disptypesel;
		}
	} else if (p->itype == instSpyder3) {
		p->_dtlist = spyd3_disptypesel;
	} else {
		p->_dtlist = spyd2_disptypesel;
	}
}

/* Get mode and option details */
static inst_code spyd2_get_disptypesel(
inst *pp,
int *pnsels,				/* Return number of display types */
inst_disptypesel **psels,	/* Return the array of display types */
int allconfig,				/* nz to return list for all configs, not just current. */
int recreate				/* nz to re-check for new ccmx & ccss files */
) {
	spyd2 *p = (spyd2 *)pp;
	inst_code rv = inst_ok;

	/* Create/Re-create a current list of available display types */
	if (p->dtlist == NULL || recreate) {
		if ((rv = inst_creat_disptype_list(pp, &p->ndtlist, &p->dtlist,
		    p->_dtlist, p->hwver >= 7 ? 1 : 0 /* doccss*/, 1 /* doccmx */)) != inst_ok)
			return rv;
	}

	if (pnsels != NULL)
		*pnsels = p->ndtlist;

	if (psels != NULL)
		*psels = p->dtlist;

	return inst_ok;
}

/* Given a display type entry, setup for that type */
static inst_code set_disp_type(spyd2 *p, inst_disptypesel *dentry) {
	inst_code ev;

	p->icx = dentry->ix;
	p->dtech = dentry->dtech;
	p->cbid = dentry->cbid;

	update_refmode(p, dentry->refr);

	if (dentry->flags & inst_dtflags_ccss) {	/* Spectral sample */

		if ((ev = spyd2_set_speccal(p, dentry->sets, dentry->no_sets)) != inst_ok) 
			return ev;
		p->ucbid = dentry->cbid;	/* This is underying base if dentry is base selection */

	} else {	/* Matrix */

		if (dentry->flags & inst_dtflags_ccmx) {
			if ((ev = set_base_disp_type(p, dentry->cc_cbid)) != inst_ok)
				return ev;
			if ((ev = spyd2_set_matcal(p, dentry->mat)) != inst_ok)
				return ev;
			p->cbid = 0;		/* Matrix is an override of cbid */

		} else {
			if ((ev = spyd2_set_matcal(p, NULL)) != inst_ok)		/* Noop */
				return ev;
			p->ucbid = dentry->cbid;	/* This is underying base if dentry is base selection */
		}
	}
	return spyd2_set_cal(p);
}


/* Set the display type */
static inst_code spyd2_set_disptype(inst *pp, int ix) {
	spyd2 *p = (spyd2 *)pp;
	inst_code ev;
	inst_disptypesel *dentry;

	if (!p->gotcoms)
		return inst_no_coms;
	if (!p->inited)
		return inst_no_init;

	if (p->dtlist == NULL) {
		if ((ev = inst_creat_disptype_list(pp, &p->ndtlist, &p->dtlist,
		    p->_dtlist, p->hwver >= 7 ? 1 : 0 /* doccss*/, 1 /* doccmx */)) != inst_ok)
			return ev;
	}

	if (ix < 0 || ix >= p->ndtlist)
		return inst_unsupported;

	dentry = &p->dtlist[ix];

	if ((ev = set_disp_type(p, dentry)) != inst_ok) {
		return ev;
	}

	return inst_ok;
}

/* Setup the default display type */
static inst_code set_default_disp_type(spyd2 *p) {
	inst_code ev;
	int i;

	if (p->dtlist == NULL) {
		if ((ev = inst_creat_disptype_list((inst *)p, &p->ndtlist, &p->dtlist,
		    p->_dtlist, p->hwver >= 7 ? 1 : 0 /* doccss*/, 1 /* doccmx */)) != inst_ok)
			return ev;
	}

	for (i = 0; !(p->dtlist[i].flags & inst_dtflags_end); i++) {
		if (p->dtlist[i].flags & inst_dtflags_default)
			break;
	}
	if (p->dtlist[i].flags & inst_dtflags_end) {
		a1loge(p->log, 1, "set_default_disp_type: failed to find type!\n");
		return inst_internal_error; 
	}
	if ((ev = set_disp_type(p, &p->dtlist[i])) != inst_ok) {
		return ev;
	}

	return inst_ok;
}

/* Setup the display type to the given base type */
static inst_code set_base_disp_type(spyd2 *p, int cbid) {
	inst_code ev;
	int i;

	if (cbid == 0) {
		a1loge(p->log, 1, "spyd2 set_base_disp_type: can't set base display type of 0\n");
		return inst_wrong_setup;
	}
	if (p->dtlist == NULL) {
		if ((ev = inst_creat_disptype_list((inst *)p, &p->ndtlist, &p->dtlist,
		    p->_dtlist, p->hwver >= 7 ? 1 : 0 /* doccss*/, 1 /* doccmx */)) != inst_ok)
			return ev;
	}

	for (i = 0; !(p->dtlist[i].flags & inst_dtflags_end); i++) {
		if (!(p->dtlist[i].flags & inst_dtflags_ccmx)		/* Prevent infinite recursion */
		 && p->dtlist[i].cbid == cbid)
			break;
	}
	if (p->dtlist[i].flags & inst_dtflags_end) {
		a1loge(p->log, 1, "set_base_disp_type: failed to find cbid %d!\n",cbid);
		return inst_wrong_setup; 
	}
	if ((ev = set_disp_type(p, &p->dtlist[i])) != inst_ok) {
		return ev;
	}

	return inst_ok;
}

/* Get the disptech and other corresponding info for the current */
/* selected display type. Returns disptype_unknown by default. */
/* Because refrmode can be overridden, it may not match the refrmode */
/* of the dtech. (Pointers may be NULL if not needed) */
static inst_code spyd2_get_disptechi(
inst *pp,
disptech *dtech,
int *refrmode,
int *cbid) {
	spyd2 *p = (spyd2 *)pp;
	if (dtech != NULL)
		*dtech = p->dtech;
	if (refrmode != NULL) {
		*refrmode = p->refrmode;
	}
	if (cbid != NULL)
		*cbid = p->cbid;
	return inst_ok;
}

/* 
 * set or reset an optional mode
 *
 * Some options talk to the instrument, and these will
 * error if it hasn't been initialised.
 * [We could fix this by setting a flag and adding
 *  some extra logic in init()]
 */
static inst_code
spyd2_get_set_opt(inst *pp, inst_opt_type m, ...) {
	spyd2 *p = (spyd2 *)pp;
	inst_code ev = inst_ok;

	/* Record the trigger mode */
	if (m == inst_opt_trig_prog
	 || m == inst_opt_trig_user) {
		p->trig = m;
		return inst_ok;
	}

	if (!p->gotcoms)
		return inst_no_coms;
	if (!p->inited)
		return inst_no_init;

	/* Set the ccss observer type */
	if (m == inst_opt_set_ccss_obs) {
		va_list args;
		icxObserverType obType;
		xspect *custObserver;

		va_start(args, m);
		obType = va_arg(args, icxObserverType);
		custObserver = va_arg(args, xspect *);
		va_end(args);

		if (obType == icxOT_default)
			obType = icxOT_CIE_1931_2;
		p->obType = obType;
		if (obType == icxOT_custom) {
			p->custObserver[0] = custObserver[0];
			p->custObserver[1] = custObserver[1];
			p->custObserver[2] = custObserver[2];
		}

		return spyd2_set_cal(p);		/* Recompute calibration */
	}

	/* Operate the LED */
	if (p->hwver >= 4) {
		if (m == inst_opt_get_gen_ledmask) {
			va_list args;
			int *mask = NULL;
	
			va_start(args, m);
			mask = va_arg(args, int *);
			va_end(args);
			*mask = 0x1;			/* One general LED */
			return inst_ok;
		} else if (m == inst_opt_get_led_state) {
			va_list args;
			int *mask = NULL;
	
			va_start(args, m);
			mask = va_arg(args, int *);
			va_end(args);
			*mask = p->led_state;
			return inst_ok;
		} else if (m == inst_opt_set_led_state) {
			va_list args;
			int mask = 0;
	
			va_start(args, m);
			mask = 1 & va_arg(args, int);
			va_end(args);
			if ((ev = spyd2_setLED(p, mask & 1 ? 2 : 0, 0.0)) == inst_ok) {
				p->led_state = mask;
			}
			return ev;
		}
	}

	if (m == inst_opt_get_pulse_ledmask) {
		va_list args;
		int *mask = NULL;

		va_start(args, m);
		mask = va_arg(args, int *);
		va_end(args);
		*mask = 0x1;			/* General LED is pulsable */
		return inst_ok;
	} else if (m == inst_opt_set_led_pulse_state) {
		va_list args;
		double period, on_time_prop, trans_time_prop;
		int mode;

		va_start(args, m);
		period = va_arg(args, double);
		on_time_prop = va_arg(args, double);
		trans_time_prop = va_arg(args, double);
		va_end(args);
		if (period < 0.0
		 || on_time_prop < 0.0 || on_time_prop > 1.0
		 || trans_time_prop < 0.0 || trans_time_prop > 1.0
		 || trans_time_prop > on_time_prop || trans_time_prop > (1.0 - on_time_prop))
			return inst_bad_parameter;
		if (period == 0.0 || on_time_prop == 0.0) {
			period = 0.0;
			mode = 0;
			p->led_state = 0;
		} else {
			mode = 1;
			p->led_state = 1;
		}
		p->led_period = period;
		p->led_on_time_prop = on_time_prop;
		p->led_trans_time_prop = trans_time_prop;
		return spyd2_setLED(p, mode, period);
	} else if (m == inst_opt_get_led_state) {
		va_list args;
		double *period, *on_time_prop, *trans_time_prop;

		va_start(args, m);
		period = va_arg(args, double *);
		on_time_prop = va_arg(args, double *);
		trans_time_prop = va_arg(args, double *);
		va_end(args);
		if (period != NULL) *period = p->led_period;
		if (on_time_prop != NULL) *on_time_prop = p->led_on_time_prop;
		if (trans_time_prop != NULL) *trans_time_prop = p->led_trans_time_prop;
		return inst_ok;
	}
	return inst_unsupported;
}

/* Constructor */
extern spyd2 *new_spyd2(icoms *icom, instType itype) {
	spyd2 *p;
	if ((p = (spyd2 *)calloc(sizeof(spyd2),1)) == NULL) {
		a1loge(icom->log, 1, "new_spyd2: malloc failed!\n");
		return NULL;
	}

	p->log = new_a1log_d(icom->log);

	p->init_coms         = spyd2_init_coms;
	p->init_inst         = spyd2_init_inst;
	p->capabilities      = spyd2_capabilities;
	p->check_mode        = spyd2_check_mode;
	p->set_mode          = spyd2_set_mode;
	p->get_disptypesel   = spyd2_get_disptypesel;
	p->set_disptype      = spyd2_set_disptype;
	p->get_disptechi     = spyd2_get_disptechi;
	p->get_set_opt       = spyd2_get_set_opt;
	p->read_sample       = spyd2_read_sample;
	p->read_refrate      = spyd2_read_refrate;
	p->get_n_a_cals      = spyd2_get_n_a_cals;
	p->calibrate         = spyd2_calibrate;
	p->col_cor_mat       = spyd2_col_cor_mat;
	p->col_cal_spec_set  = spyd2_col_cal_spec_set;
	p->get_refr_rate     = spyd2_get_refr_rate;
	p->set_refr_rate     = spyd2_set_refr_rate;
	p->interp_error      = spyd2_interp_error;
	p->del               = spyd2_del;

	p->icom = icom;
	p->itype = itype;

	/* Load manufacturers Spyder4 calibrations */
	if (itype == instSpyder4
	 || itype == instSpyder5) {
		int rv;
		p->hwver = 7;		/* Set preliminary version */
		if ((rv = spyd4_load_cal(p)) != SPYD2_OK)
			a1logd(p->log, 1, "Loading Spyder4 calibrations failed with '%s'\n",p->interp_error((inst *)p, rv));
		if (spyd4_nocals < 1)
			a1logd(p->log, 1, "Spyder4 choice of calibrations not available\n");
	}
	if (itype == instSpyder3) {
		p->hwver = 4;		/* Set preliminary version */
	}
	if (itype == instSpyder1		// ????
	 || itype == instSpyder2) {
		p->hwver = 3;		/* Set preliminary version */
	}

	icmSetUnity3x3(p->ccmat);	/* Set the colorimeter correction matrix to do nothing */
	set_base_disptype_list(p);
	p->dtech = disptech_unknown;

	return p;
}


/* This is called by utilities that need to be able to access the Spyder 2 colorimeter. */
/* and be able to check if the firmware is available. */

/* id = 0 for Spyder 1, 1 for Spyder 2 */
/* Return 0 if Spyder firmware is not available */
/* Return 1 if Spyder firmware is available */
int setup_spyd2(int id) {
#ifdef ENABLE_USB
	char **bin_paths = NULL;
	int no_paths = 0;
	unsigned int size, rsize;
	char *p1;
	FILE *fp;
	int i;

	id &= 1;

	/* If not loaded, try and load it */
	if (spyder_pld_size[id] == 0) {
		

		for (;;) {	/* So we can break out */
			if (id == 0)
				p1 = "ArgyllCMS/spyd1PLD.bin" XDG_FUDGE "color/spyd1PLD.bin";
			else
				p1 = "ArgyllCMS/spyd2PLD.bin" XDG_FUDGE "color/spyd2PLD.bin";

			if ((no_paths = xdg_bds(NULL, &bin_paths, xdg_data, xdg_read, xdg_user, p1)) < 1) {
				a1logd(g_log, 1, "setup_spyd2: failed to find PLD file on path '%s'\n",p1);
				break;
			}

			/* open binary file */
#if !defined(O_CREAT) && !defined(_O_CREAT)
# error "Need to #include fcntl.h!"
#endif
#if defined(O_BINARY) || defined(_O_BINARY)
			if ((fp = fopen(bin_paths[0],"rb")) == NULL)
#else
			if ((fp = fopen(bin_paths[0],"r")) == NULL)
#endif
			{
				a1logd(g_log, 1, "setup_spyd2: couldn't find '%s'\n",bin_paths[0]);
				break;
			}

			/* Figure out how file it is */
			if (fseek(fp, 0, SEEK_END)) {
				fclose(fp);
				break;
			}
			size = (unsigned long)ftell(fp);
			rsize = (size + 7) & ~7;		/* Rounded up size */

			if ((spyder_pld_bytes[id] = malloc(rsize)) == NULL) {
				a1logd(g_log,1,"Spyder pld load malloc failed\n");
				fclose(fp);
				break;
			}

			if (fseek(fp, 0, SEEK_SET)) {
				fclose(fp);
				break;
			}
		
			if (fread(spyder_pld_bytes[id], 1, size, fp) != size) {
				fclose(fp);
				break;
			}

			/* Pad out to even 8 bytes */
			for (i = size; i < rsize; i++)
				spyder_pld_bytes[id][i] = 0xff;

			spyder_pld_size[id] = rsize;

			a1logd(g_log, 1, "setup_spyd2: loaded '%s' OK\n",bin_paths[0]);

			fclose(fp);
			break;
		}
		xdg_free(bin_paths, no_paths);
	}

	if (spyder_pld_size[id] != 0)
		return 1;			/* Available */
#endif /* ENABLE_USB */
	return 0;				/* Not available */
}