
/* 
 * Argyll Color Correction System
 *
 * Xrite DTP22 related functions
 *
 * Author: Graeme W. Gill
 * Date:   17/11/2006
 *
 * Copyright 1996 - 2013, Graeme W. Gill
 * All rights reserved.
 *
 * This material is licenced under the GNU GENERAL PUBLIC LICENSE Version 2 or later :-
 * see the License2.txt file for licencing details.
 */

/* 
   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.
 */

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <time.h>
#include <stdarg.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 "dtp22.h"

/* Default flow control (Instrument doesn't support HW flow control) */
#define DEFFC fc_XonXOff

static inst_code dtp22_interp_code(inst *pp, int ec);
static int comp_password(char *out, char *in, unsigned char key[4]);
static inst_code activate_mode(dtp22 *p);
static inst_code dtp22_get_set_opt(inst *pp, inst_opt_type m, ...);

#define MAX_MES_SIZE 500		/* Maximum normal message reply size */
#define MAX_RD_SIZE 5000		/* Maximum reading messagle reply size */

/* Known DTP22 challenge/response keys for each OEM */
/* (This is a 24 bit key - only the xor of the middle 2 bytes is significant) */
/* The keys seem to be base 6/36, using nibbles with 2+2 bits: 3 5 6 9 A C */
/* The last digit corresponds to the OEM serial number (ie. 6C + 9base6 = A6) */
/* Possibly each digit is offset by the oemsn if counted in the right sequence ? - */
/* ie. base 40 sequence or so ? Need more examples of keys to tell. */
struct {
	int oemsn;	
	unsigned char key[4];
} keys[] = {
	{  0, { 0x39, 0xa6, 0x55, 0x6c }},	/* Standard DTP22 */
	{  9, { 0x5a, 0x66, 0xcc, 0xa6 }},	/* ColorMark calibrator - MacDermid GRAPHICARTS ColorSpan */
	{ -1, }								/* End marker */
};

/* Extract an error code from a reply string */
/* Return -1 if no error code can be found */
static int 
extract_ec(char *s) {
	char *p;
	char tt[3];
	int rv;
	p = s + strlen(s);
	/* Find the trailing '>' */
	for (p--; p >= s;p--) {
		if (*p == '>')
			break;
	}
	if (  (p-3) < s
	   || p[0] != '>'
	   || p[-3] != '<')
		return -1;
	tt[0] = p[-2];
	tt[1] = p[-1];
	tt[2] = '\000';
	if (sscanf(tt,"%x",&rv) != 1)
		return -1;
	/* For some reason the top bit sometimes get set ? */
	rv &= 0x7f;
	return rv;
}

/* Interpret an icoms error into a DTP22 error */
static int icoms2dtp22_err(int se) {
	if (se != ICOM_OK) {
		if (se & ICOM_TO)
			return DTP22_TIMEOUT; 
		return DTP22_COMS_FAIL;
	}
	return DTP22_OK;
}

/* Do a full featured command/response echange with the dtp22 */
/* Return the dtp error code. End on the specified number */
/* of specified characters, or expiry if the specified timeout */
/* Assume standard error code if tc = '>' and ntc = 1 */
/* Return a DTP22 error code */
static int
dtp22_fcommand(
	struct _dtp22 *p,
	char *in,			/* In string */
	char *out,			/* Out string buffer */
	int bsize,			/* Out buffer size */
	char tc,			/* Terminating character */
	int ntc,			/* Number of terminating characters */
	double to) {		/* Timout in seconds */
	int se, rv = DTP22_OK;

	if ((se = p->icom->write_read(p->icom, in, out, bsize, tc, ntc, to)) != 0) {
		a1logd(p->log, 1, "dtp22_fcommand: serial i/o failure on write_read '%s'\n",icoms_fix(in));
		return icoms2dtp22_err(se);
	}
	if (tc == '>' && ntc == 1) {
		rv = extract_ec(out);
#ifdef NEVER		/* Simulate an error ?? */
	if (strcmp(in, "0PR\r") == 0)
		rv = 0x1b;
#endif /* NEVER */
		if (rv > 0) {
			rv &= inst_imask;
			if (rv != DTP22_OK) {	/* Clear the error */
				char buf[MAX_MES_SIZE];
				p->icom->write_read(p->icom, "CE\r", buf, MAX_MES_SIZE, '>', 1, 0.5);
			}
		}
	}
	a1logd(p->log, 4, "dtp22_fcommand: command '%s' returned '%s', value 0x%x\n",
	                                            icoms_fix(in), icoms_fix(out),rv);
	return rv;
}

/* Do a standard command/response echange with the dtp22 */
/* Return the dtp error code */
static inst_code
dtp22_command(dtp22 *p, char *in, char *out, int bsize, double to) {
	int rv = dtp22_fcommand(p, in, out, bsize, '>', 1, to);
	return dtp22_interp_code((inst *)p, rv);
}

/* Establish communications with a DTP22 */
/* If it's a serial port, use the baud rate given, and timeout in to secs */
/* Return DTP_COMS_FAIL on failure to establish communications */
static inst_code
dtp22_init_coms(inst *pp, baud_rate br, flow_control fc, double tout) {
	dtp22 *p = (dtp22 *) pp;
	char buf[MAX_MES_SIZE];
	baud_rate brt[5] = { baud_9600, baud_19200, baud_4800, baud_2400, baud_1200 };
	char *brc[5]     = { "30BR\r",  "60BR\r",   "18BR\r",  "0CBR\r",  "06BR\r" };
	char *fcc;
	unsigned int etime;
	int ci, bi, i, se;
	inst_code ev = inst_ok;

	a1logd(p->log, 2, "dtp22_init_coms: About to init Serial I/O\n");

	/* Deal with flow control setting */
	if (fc == fc_nc)
		fc = DEFFC;
	if (fc == fc_XonXOff) {
		fcc = "0304CF\r";
	} else if (fc == fc_Hardware) {
		fcc = "0104CF\r";
	} else {
		fc = fc_none;
		fcc = "0004CF\r";
	}

	/* Figure DTP22 baud rate being asked for */
	for (bi = 0; bi < 5; bi++) {
		if (brt[bi] == br)
			break;
	}
	if (bi >= 5)
		bi = 0;	

	/* Figure current icoms baud rate */
	for (ci = 0; ci < 5; ci++) {
		if (brt[ci] == p->icom->br)
			break;
	}
	if (ci >= 5)
		ci = bi;	

	/* The tick to give up on */
	etime = msec_time() + (long)(1000.0 * tout + 0.5);

	while (msec_time() < etime) {

		a1logd(p->log, 4, "dtp22_init_coms: Trying different baud rates (%u msec to go)\n",
		                                                              etime - msec_time());

		/* Until we time out, find the correct baud rate */
		for (i = ci; msec_time() < etime;) {

			if ((se = p->icom->set_ser_port(p->icom, fc_none, brt[i], parity_none,
			                                                 stop_1, length_8)) != ICOM_OK) { 
				a1logd(p->log, 1, "dtp22_init_coms: set_ser_port failed ICOM err 0x%x\n",se);
				return dtp22_interp_code((inst *)p, icoms2dtp22_err(se));
			}
			if (((ev = dtp22_command(p, "\r", buf, MAX_MES_SIZE, 0.5)) & inst_mask)
				                                                 != inst_coms_fail)
				break;		/* We've got coms */

			/* Check for user abort */
			if (p->uicallback != NULL) {
				inst_code ev;
				if ((ev = p->uicallback(p->uic_cntx, inst_negcoms)) == inst_user_abort) {
					a1logd(p->log, 1, "dtp22_init_coms: user aborted\n");
					return ev;
				}
			}
			if (++i >= 5)
				i = 0;
		}
		break;		/* Got coms */
	}

	if (msec_time() >= etime) {		/* We haven't established comms */
		return inst_coms_fail;
	}

	/* Set the handshaking */
	if ((ev = dtp22_command(p, fcc, buf, MAX_MES_SIZE, 0.2)) != inst_ok)
		return ev;

	/* Change the baud rate to the rate we've been told */
	if ((se = p->icom->write_read(p->icom, brc[bi], buf, MAX_MES_SIZE, '>', 1, .2)) != 0) {
		if (extract_ec(buf) != DTP22_OK)
			return inst_coms_fail;
	}

	/* Configure our baud rate and handshaking as well */
	if ((se = p->icom->set_ser_port(p->icom, fc, brt[bi], parity_none, stop_1, length_8)) != ICOM_OK) {
		a1logd(p->log, 1, "dtp22_init_coms: set_ser_port failed ICOM err 0x%x\n",se);
		return dtp22_interp_code((inst *)p, icoms2dtp22_err(se));
	}

	/* Loose a character (not sure why) */
	p->icom->write_read(p->icom, "\r", buf, MAX_MES_SIZE, '>', 1, 0.1);

	/* Check instrument is responding, and reset it again. */
	if ((ev = dtp22_command(p, "\r", buf, MAX_MES_SIZE, 0.2)) != inst_ok
	 || (ev = dtp22_command(p, "0PR\r", buf, MAX_MES_SIZE, 2.0)) != inst_ok) {

		a1logd(p->log, 1, "dtp22_init_coms: failed with ICOM 0x%x\n",ev);

		p->icom->del(p->icom);		/* Since caller may not clean up */
		p->icom = NULL;
		return inst_coms_fail;
	}

	a1logd(p->log, 2, "dtp22_init_coms: init coms has suceeded\n");

	p->gotcoms = 1;
	return inst_ok;
}

/* Initialise the DTP22 */
/* return non-zero on an error, with dtp error code */
static inst_code
dtp22_init_inst(inst *pp) {
	dtp22 *p = (dtp22 *)pp;
	char buf[MAX_MES_SIZE], *bp;
	inst_code ev = inst_ok;
	int i;

	a1logd(p->log, 2, "dtp22_init_inst: called\n");

	if (p->gotcoms == 0)
		return inst_internal_error;		/* Must establish coms before calling init */

	/* Warm reset it */
	if ((ev = dtp22_command(p, "0PR\r", buf, MAX_MES_SIZE, 2.0)) != inst_ok)
		return ev;

	/* Get the model and version number */
	if ((ev = dtp22_command(p, "SV\r", buf, MAX_MES_SIZE, 0.2)) != inst_ok)
		return ev;

	/* Check that it is a DTP22 */
	if (   strlen(buf) < 12
	    || (strncmp(buf,"X-Rite DTP22",12) != 0))
		return inst_unknown_model;

	/* Factory reset */
//	if ((ev = dtp22_command(p, "5CRI\r", buf, MAX_MES_SIZE, 10.2)) != inst_ok)
//			return ev;

	/* Turn echoing of characters off */
	if ((ev = dtp22_command(p, "0EC\r", buf, MAX_MES_SIZE, 0.2)) != inst_ok)
			return ev;

	/* Set decimal point on */
	if ((ev = dtp22_command(p, "0106CF\r", buf, MAX_MES_SIZE, 0.2)) != inst_ok)
		return ev;

	/* Set color data separator to TAB */
	if ((ev = dtp22_command(p, "0207CF\r", buf, MAX_MES_SIZE, 0.2)) != inst_ok)
		return ev;

	/* Set delimeter to CR */
	if ((ev = dtp22_command(p, "0008CF\r", buf, MAX_MES_SIZE, 0.2)) != inst_ok)
		return ev;

	/* Set extra digit resolution (X10) */
	if ((ev = dtp22_command(p, "010ACF\r", buf, MAX_MES_SIZE, 0.2)) != inst_ok)
		return ev;

	/* - - - - - - - - - - - - - - - - - - - - - - - - */
	/* Get some information about the instrument */
	if ((ev = dtp22_command(p, "GI\r", buf, MAX_MES_SIZE, 0.2)) != inst_ok) {
		a1logd(p->log, 1, "dtp22: GI command failed with ICOM err 0x%x\n",ev);
		return ev;
	}

	/* Extract some of these */
	if ((bp = strstr(buf, "Serial Number:")) != NULL) {
		bp += strlen("Serial Number:");
		p->serno = atoi(bp);
	} else {
		p->serno = -1;
	}
	if ((bp = strstr(buf, "OEM Serial #:")) != NULL) {
		bp += strlen("OEM Serial #:");
		p->oemsn = atoi(bp);
	} else {
		p->oemsn = -1;
	}
	if ((bp = strstr(buf, "Cal Plaque Serial #:")) != NULL) {
		bp += strlen("Cal Plaque Serial #:");
		p->plaqueno = atoi(bp);
	} else {
		p->plaqueno = -1;
	}
	if (p->log->verb) {
		int i, j;
		for (j = i = 0; ;i++) {
			if (buf[i] == '<' || buf[i] == '\000')
				break;
			if (buf[i] == '\r') {
				buf[i] = '\000';
				a1logv(p->log, 1, " %s\n",&buf[j]);
				if (buf[i+1] == '\n')
					i++;
				j = i+1;
			}
		}
	}

	/* - - - - - - - - - - - - - - - - - - - - - - - - */
	/* Setup for the default type of measurements we want to do */

	/* Disable key codes */
	if ((ev = dtp22_command(p, "0OK\r", buf, MAX_MES_SIZE, 0.2)) != inst_ok)
		return ev;

	/* Disable the read microswitch by default */
	if ((ev = dtp22_command(p, "0PB\r", buf, MAX_MES_SIZE, 0.2)) != inst_ok)
		return ev;
	p->trig = inst_opt_trig_user;

	/* Set format to colorimetric */
	if ((ev = dtp22_command(p, "0120CF\r", buf, MAX_MES_SIZE, 0.2)) != inst_ok)
		return ev;
	p->mode &= ~inst_mode_spectral;

	/* Set colorimetric to XYZ */
	if ((ev = dtp22_command(p, "0221CF\r", buf, MAX_MES_SIZE, 0.2)) != inst_ok)
		return ev;

	/* Disable density */
	if ((ev = dtp22_command(p, "0022CF\r", buf, MAX_MES_SIZE, 0.2)) != inst_ok)
		return ev;

	/* Enable spectral */
	if ((ev = dtp22_command(p, "0126CF\r", buf, MAX_MES_SIZE, 0.2)) != inst_ok)
		return ev;

	/* Set Illuminant to D50_2 */
	if ((ev = dtp22_command(p, "0427CF\r", buf, MAX_MES_SIZE, 0.2)) != inst_ok)
		return ev;

	/* Read the current calibration values */
//	if ((ev = dtp22_command(p, "0LC\r", buf, MAX_MES_SIZE, 10.2)) != inst_ok)
//		return ev;

	/* See that we have the correct challenge/response key */
	for (i = 0; keys[i].oemsn >= 0; i++) {
		if (keys[i].oemsn == p->oemsn) {
			p->key[0] = keys[i].key[0];
			p->key[1] = keys[i].key[1];
			p->key[2] = keys[i].key[2];
			p->key[3] = keys[i].key[3];
			break;
		}
	}
	if (keys[i].oemsn < 0)
		return inst_unknown_model | DTP22_UNKN_OEM;

	p->inited = 1;
	a1logd(p->log, 2, "dtp22_init_inst: instrument inited OK\n");

	return inst_ok;
}

/* Read a single sample */
/* Return the instrument error code */
static inst_code
dtp22_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 */
	dtp22 *p = (dtp22 *)pp;
	char *tp;
	char buf[MAX_RD_SIZE];
	char buf2[50];
	int se;
	inst_code ev = inst_ok;
	int switch_trig = 0;
	int user_trig = 0;

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

	if ((ev = activate_mode(p)) != inst_ok) 
		return ev;

	/* Signal a calibration is needed */
	if (p->need_cal && p->noutocalib == 0) {
		return inst_needs_cal;		/* Get user to calibrate */
	}

	/* Request challenge, so that we can return the response */
	if ((ev = dtp22_command(p, "GP\r", buf, MAX_MES_SIZE, 0.2)) != inst_ok)
		return ev;
	
	if (comp_password(buf2, buf, p->key))
		return inst_internal_error | DTP22_INTERNAL_ERROR;

	/* Validate the password */
	strcat(buf2, "VD\r");
	if ((ev = dtp22_command(p, buf2, buf, MAX_MES_SIZE, 0.2)) != inst_ok)
		return ev;
	
	if (strncmp(buf,"PASS", 4) != 0)
		return inst_unknown_model | DTP22_BAD_PASSWORD;

	if (p->trig == inst_opt_trig_user_switch) {

		/* Enable the read microswitch */
		if ((ev = dtp22_command(p, "3PB\r", buf, MAX_MES_SIZE, 0.2)) != inst_ok)
			return ev;

		/* Wait for the microswitch to be triggered, or the user to trigger */
		for (;;) {
			if ((se = p->icom->read(p->icom, buf, MAX_MES_SIZE, '>', 1, 1.0)) != 0) {
				if ((se & ICOM_TO) == 0) {		/* Some sort of read error */
					/* Disable the read microswitch */
					dtp22_command(p, "2PB\r", buf, MAX_MES_SIZE, 0.2);
					return dtp22_interp_code((inst *)p, icoms2dtp22_err(se));
				}
				/* Timed out */
				if (p->uicallback != NULL) {	/* Check for user trigger */
					if ((ev = p->uicallback(p->uic_cntx, inst_armed)) != inst_ok) {
						if (ev == inst_user_abort) {
							/* Disable the read microswitch */
							dtp22_command(p, "2PB\r", buf, MAX_MES_SIZE, 0.2);
							return ev;			/* User abort */
						}
						if (ev == inst_user_trig)
							break;					/* Trigger */
					}
				}
			} else {	/* Inst error or switch activated */
				if (strlen(buf) >= 4
				 && buf[0] == '<' && isdigit(buf[1]) && isdigit(buf[2]) && buf[3] == '>') {
					if ((ev = dtp22_interp_code((inst *)p, extract_ec(buf))) != inst_ok) {
						dtp22_command(p, "CE\r", buf, MAX_MES_SIZE, 0.5);
						dtp22_command(p, "2PB\r", buf, MAX_MES_SIZE, 0.5);
						return ev;
					}
					switch_trig = 1;
					break;				/* Measure triggered via inst switch */
				}
			}
		}
		/* Disable the read microswitch */
		if ((ev = dtp22_command(p, "2PB\r", buf, MAX_MES_SIZE, 0.2)) != inst_ok)
			return ev;
		/* Notify of trigger */
		if (p->uicallback)
			p->uicallback(p->uic_cntx, inst_triggered); 

	} else if (p->trig == inst_opt_trig_user) {

		if (p->uicallback == NULL) {
			a1logd(p->log, 1, "dtp22: 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)
					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 */
	}

	/* Trigger a read if the switch has not been used */
	if (switch_trig == 0) {
		if ((ev = dtp22_command(p, "RM\r", buf, MAX_RD_SIZE, 20.0)) != inst_ok) {
			return ev; 	/* Misread */
		}
	}

	/* Gather the results in D50_2 XYZ % reflectance */
	if ((ev = dtp22_command(p, "0SR\r", buf, MAX_RD_SIZE, 5.0)) != inst_ok)
		return ev; 	/* misread */

	/* Parse the buffer */
	/* Replace '\r' with '\000' */
	for (tp = buf; *tp != '\000'; tp++) {
		if (*tp == '\r')
			*tp = '\000';
	}

	if (sscanf(buf, " X %lf Y %lf Z %lf ", &val->XYZ[0], &val->XYZ[1], &val->XYZ[2]) != 3) {
		return inst_protocol_error;
	}

	/* This may not change anything since instrument may clamp */
	if (clamp)
		icmClamp3(val->XYZ, val->XYZ);
	val->loc[0] = '\000';
	val->mtype = inst_mrt_reflective;
	val->XYZ_v = 1;
	val->sp.spec_n = 0;
	val->duration = 0.0;

	if (p->mode & inst_mode_spectral) {
		int j;
		char *fmt;

		/* Reset tp to point to start of spectral */
		tp = buf + strlen(buf) + 1;

		/* Different dialects spoken by DTP-22 */
		if (strcmp(tp, "SPECTRAL DATA") == 0 ) {
			tp += strlen(tp) + 1;
			fmt = " w %*lf S %lf ";
		} else {
			fmt = " S %lf ";
		}

		/* Read the spectral value */
		for (j = 0; j < 31; j++) {
			if (sscanf(tp, fmt, &val->sp.spec[j]) != 1)
				return inst_protocol_error;
			tp += strlen(tp) + 1;
		}

		val->sp.spec_n = 31;
		val->sp.spec_wl_short = 400.0;
		val->sp.spec_wl_long = 700.0;
		val->sp.norm = 100.0;
	}

	if (user_trig)
		return inst_user_trig;
	return inst_ok;
}

/* Return needed and available inst_cal_type's */
static inst_code dtp22_get_n_a_cals(inst *pp, inst_cal_type *pn_cals, inst_cal_type *pa_cals) {
	dtp22 *p = (dtp22 *)pp;
	inst_cal_type n_cals = inst_calt_none;
	inst_cal_type a_cals = inst_calt_none;
		
	if (p->need_cal && p->noutocalib == 0)
		n_cals |= inst_calt_ref_white;
	a_cals |= inst_calt_ref_white;

	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. */
inst_code dtp22_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) */
) {
	dtp22 *p = (dtp22 *)pp;
	char buf[MAX_RD_SIZE];
	int se;
	inst_code tv, ev = inst_ok;
    inst_cal_type needed, available;
	int swen = 0;

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

	id[0] = '\000';

	if ((ev = dtp22_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,"dtp22_calibrate: doing calt 0x%x\n",calt);

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

	/* See if it's a calibration we understand */
	if (*calt & ~available & inst_calt_all_mask) { 
		return inst_unsupported;
	}

	if (*calt & inst_calt_ref_white) {		/* White calibration */

		sprintf(id, "Serial no. %d",p->plaqueno);
		if (*calc != inst_calc_man_ref_whitek) {
			*calc = inst_calc_man_ref_whitek;
			ev = inst_cal_setup;
			goto do_exit;
		}

		/* Calibration only works when triggered by the read switch... */
		if (!swen) {
			if ((ev = dtp22_command(p, "3PB\r", buf, MAX_MES_SIZE, 0.2)) != inst_ok)
				return ev;
			swen = 1;
		}

		if ((ev = activate_mode(p)) != inst_ok) 
			goto do_exit;

		/* Issue white calibration */
		if ((se = p->icom->write(p->icom, "1CA\r", 0.5)) != ICOM_OK) {
			ev = dtp22_interp_code((inst *)p, icoms2dtp22_err(se));
			goto do_exit;
		}

		/* Wait for the microswitch to be triggered, or a user trigger via uicallback */
		for (;;) {
			if ((se = p->icom->read(p->icom, buf, MAX_MES_SIZE, '>', 1, 1.0)) != 0) {
				if ((se & ICOM_TO) == 0) {		/* Some sort of read error */
					ev = dtp22_interp_code((inst *)p, icoms2dtp22_err(se));
					goto do_exit;
				}
				/* Timed out - poll user */
				if (p->uicallback != NULL) {	/* Check for user trigger */
					if ((ev = p->uicallback(p->uic_cntx, inst_armed)) != inst_ok) {
						if (ev == inst_user_abort)
							goto do_exit;			/* User abort */
						if (ev == inst_user_trig)
							break;					/* User trigger */
					}
				}
			} else {	/* Inst error or switch activated */
				if (strlen(buf) >= 4
				 && buf[0] == '<' && isdigit(buf[1]) && isdigit(buf[2]) && buf[3] == '>') {
					if ((ev = dtp22_interp_code((inst *)p, extract_ec(buf))) != inst_ok) {
						dtp22_command(p, "CE\r", buf, MAX_MES_SIZE, 0.5);
						if (ev != inst_ok)
							goto do_exit;			/* Error */
					}
					break;				/* Switch trigger */
				}
			}
		}

		if (p->uicallback)	/* Notify of trigger */
			p->uicallback(p->uic_cntx, inst_triggered); 

		p->need_cal = 0;
		*calt &= ~inst_calt_ref_white;

	}
	if (*calt & inst_calt_ref_dark) {	/* Black calibration */

		if (*calc != inst_calc_man_ref_dark) {
			*calc = inst_calc_man_ref_dark;
			ev = inst_cal_setup;
			goto do_exit;
		}

		/* Check for abort */
		if (p->uicallback != NULL
		 && (ev = p->uicallback(p->uic_cntx, inst_armed)) == inst_user_abort) {
			goto do_exit;
		}

		/* Calibration only works when triggered by the read switch... */
		if (!swen) {
			if ((ev = dtp22_command(p, "3PB\r", buf, MAX_MES_SIZE, 0.2)) != inst_ok)
				return ev;
			swen = 1;
		}

		if ((ev = activate_mode(p)) != inst_ok)
			goto do_exit;

		/* Do black calibration */
		if ((ev = dtp22_command(p, "1CB\r", buf, MAX_RD_SIZE, 20)) != inst_ok)
			goto do_exit;

		/* Make calibration permanent */
		if ((ev = dtp22_command(p, "MP\r", buf, MAX_RD_SIZE, 10.0)) != inst_ok)
			goto do_exit;

		*calt &= ~inst_calt_ref_dark;
	}

 do_exit:

	if (swen) {
		/* Disable the read microswitch */
		if ((tv = dtp22_command(p, "3PB\r", buf, MAX_MES_SIZE, 0.2)) != inst_ok && ev == inst_ok)
			return tv;
		swen = 0;
	}

	return ev;
}

/* Error codes interpretation */
static char *
dtp22_interp_error(inst *pp, int ec) {
//	dtp22 *p = (dtp22 *)pp;
	ec &= inst_imask;
	switch (ec) {
		case DTP22_INTERNAL_ERROR:
			return "Internal software error";
		case DTP22_COMS_FAIL:
			return "Communications failure";
		case DTP22_UNKNOWN_MODEL:
			return "Not a DTP22 or DTP52";
		case DTP22_DATA_PARSE_ERROR:
			return "Data from DTP didn't parse as expected";
		case DTP22_UNKN_OEM:
			return "Instrument is an unknown OEM version";
		case DTP22_BAD_PASSWORD:
			return "Instrument password was rejected";

		case DTP22_OK:
			return "No device error";

		case DTP22_BAD_COMMAND:
			return "Unrecognized command";
		case DTP22_PRM_RANGE:
			return "Command parameter out of range";
		case DTP22_MEMORY_OVERFLOW:
			return "Memory bounds error";
		case DTP22_INVALID_BAUD_RATE:
			return "Invalid baud rate";
		case DTP22_TIMEOUT:
			return "Receive timeout";
		case DTP22_SYNTAX_ERROR:
			return "Badly formed parameter";
		case DTP22_INCORRECT_DATA_FORMAT:
			return "Incorrect Data Format";
		case DTP22_WEAK_LAMP:
			return "Lamp is weak";
		case DTP22_LAMP_FAILED:
			return "Lamp has failed";
		case DTP22_UNSTABLE_CAL:
			return "Unstable calibration";
		case DTP22_CAL_GAIN_ERROR:
			return "Error setting gains during calibration";
		case DTP22_SENSOR_FAILURE:
			return "Sensing cell failure";
		case DTP22_BLACK_CAL_TOO_HIGH:
			return "Black calibration values are too high";
		case DTP22_UNSTABLE_BLACK_CAL:
			return "Unstable black calibration";
		case DTP22_CAL_MEM_ERROR:
			return "Memory error with calibration values";
		case DTP22_FILTER_MOTOR:
			return "Filter motor not working";
		case DTP22_LAMP_FAILED_READING:
			return "Lamp failed during reading";
		case DTP22_POWER_INTR_READING:
			return "Power failed during reading";
		case DTP22_SIG_OFFSETS_READING:
			return "Signal offsets exceeded limits during reading";
		case DTP22_RD_SWITCH_TO_SOON:
			return "Read switch released too soon";
		case DTP22_OVERRANGE:
			return "Overrange reading";
		case DTP22_FILT_POS_ERROR:
			return "Filter position sensor error";
		case DTP22_FACT_TST_CONNECT:
			return "Factory test connector error";
		case DTP22_FACT_TST_LAMP_INH:
			return "Factory test lamp inhibit error";

		case DTP22_EEPROM_FAILURE:
			return "EEprom write failure";
		case DTP22_PROGRAM_WRITE_FAIL:
			return "Loading new program error";
		case DTP22_MEMORY_WRITE_FAIL:
			return "Memory write error";
		default:
			return "Unknown error code";
	}
}


/* Convert a machine specific error code into an abstract dtp code */
static inst_code 
dtp22_interp_code(inst *pp, int ec) {
//	dtp22 *p = (dtp22 *)pp;

	ec &= inst_imask;
	switch (ec) {

		case DTP22_OK:
			return inst_ok;

		case DTP22_INTERNAL_ERROR:
			return inst_internal_error | ec;

		case DTP22_COMS_FAIL:
			return inst_coms_fail | ec;

		case DTP22_UNKNOWN_MODEL:
		case DTP22_UNKN_OEM:
		case DTP22_BAD_PASSWORD:
			return inst_unknown_model | ec;

		case DTP22_DATA_PARSE_ERROR:
			return inst_protocol_error | ec;

		case DTP22_POWER_INTR_READING:
		case DTP22_RD_SWITCH_TO_SOON:
		case DTP22_OVERRANGE:
		case DTP22_SIG_OFFSETS_READING:
		case DTP22_UNSTABLE_CAL:
		case DTP22_UNSTABLE_BLACK_CAL:
		case DTP22_BLACK_CAL_TOO_HIGH:
		case DTP22_CAL_GAIN_ERROR:				/* Or H/W error ? */
			return inst_misread | ec;

		case DTP22_WEAK_LAMP:
		case DTP22_LAMP_FAILED:
		case DTP22_SENSOR_FAILURE:
		case DTP22_CAL_MEM_ERROR:
		case DTP22_FILTER_MOTOR:
		case DTP22_LAMP_FAILED_READING:
		case DTP22_FACT_TST_CONNECT:
		case DTP22_FACT_TST_LAMP_INH:
		case DTP22_EEPROM_FAILURE:
		case DTP22_PROGRAM_WRITE_FAIL:
		case DTP22_MEMORY_WRITE_FAIL:
		case DTP22_FILT_POS_ERROR:
			return inst_hardware_fail | ec;
	}
	return inst_other_error | ec;
}

/* Destroy ourselves */
static void
dtp22_del(inst *pp) {
	dtp22 *p = (dtp22 *)pp;
	if (p->icom != NULL)
		p->icom->del(p->icom);
	free(p);
}

/* Return the instrument capabilities */
void dtp22_capabilities(inst *pp,
inst_mode *pcap1,
inst2_capability *pcap2,
inst3_capability *pcap3) {
	inst_mode cap1 = 0;
	inst2_capability cap2 = 0;

	cap1 |= inst_mode_ref_spot
	     |  inst_mode_colorimeter
	     |  inst_mode_spectral
	        ;

	cap2 |= inst2_prog_trig
	     |  inst2_user_trig
	     |  inst2_user_switch_trig
	     |  inst2_cal_using_switch		/* DTP22 special */
	        ;

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

/* Activate the last set mode */
static inst_code
activate_mode(dtp22 *p) {
	static char buf[MAX_MES_SIZE];
	inst_code rv;

	if (p->mode != p->lastmode) {

		if ((p->lastmode & inst_mode_spectral) == inst_mode_spectral
		 && (p->mode     & inst_mode_spectral) != inst_mode_spectral) {
	
			/* Set format to colorimetric + spectral */
			if ((rv = dtp22_command(p, "0020CF\r", buf, MAX_MES_SIZE, 0.2)) != inst_ok)
				return rv;
		}
		if ((p->lastmode & inst_mode_spectral) != inst_mode_spectral
		 && (p->mode     & inst_mode_spectral) == inst_mode_spectral) {
	
			/* Set format to just colorimetric */
			if ((rv = dtp22_command(p, "0120CF\r", buf, MAX_MES_SIZE, 0.2)) != inst_ok)
				return rv;
		}
		p->mode = p->lastmode;
	}
	return inst_ok;
}

/* 
 * check measurement mode
 */
static inst_code
dtp22_check_mode(inst *pp, inst_mode m) {
	dtp22 *p = (dtp22 *)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;

	/* General check mode against specific capabilities logic: */
	if (!IMODETST(m, inst_mode_ref_spot)) {
		return inst_unsupported;
	}

	return inst_ok;
}

/* 
 * set measurement mode
 */
static inst_code
dtp22_set_mode(inst *pp, inst_mode m)
{
	dtp22 *p = (dtp22 *)pp;
	inst_code ev;

	if ((ev = dtp22_check_mode(pp, m)) != inst_ok)
		return ev;

	p->lastmode = m;

	return inst_ok;
}

/* !! It's not clear if there is a way of knowing */
/* whether the instrument has a UV filter. */

/* 
 * set or reset an optional mode
 *
 * Since there is no interaction with the instrument,
 * was assume that all of these can be done before initialisation.
 */
static inst_code
dtp22_get_set_opt(inst *pp, inst_opt_type m, ...)
{
	dtp22 *p = (dtp22 *)pp;

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

	return inst_unsupported;
}

/* Constructor */
extern dtp22 *new_dtp22(icoms *icom, instType itype) {
	dtp22 *p;
	if ((p = (dtp22 *)calloc(sizeof(dtp22),1)) == NULL) {
		a1loge(icom->log, 1, "new_dtp22: malloc failed!\n");
		return NULL;
	}

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

	p->init_coms             = dtp22_init_coms;
	p->init_inst             = dtp22_init_inst;
	p->capabilities          = dtp22_capabilities;
	p->check_mode            = dtp22_check_mode;
	p->set_mode              = dtp22_set_mode;
	p->get_set_opt           = dtp22_get_set_opt;
	p->read_sample           = dtp22_read_sample;
	p->get_n_a_cals          = dtp22_get_n_a_cals;
	p->calibrate             = dtp22_calibrate;
	p->interp_error          = dtp22_interp_error;
	p->del                   = dtp22_del;

	p->icom = icom;
	p->itype = icom->itype;
	p->mode = inst_mode_none;
	p->need_cal = 1;			/* Do a white calibration each time we open the device */

	return p;
}

/* Compute the DTP22/Digital Swatchbook password response. */
/* Return NZ if there was an error */
static int comp_password(char *out, char *in, unsigned char key[4]) {
	unsigned short inv[5];
	unsigned short outv;

	in[10] = '\000';

	/* Convert the 10 hex chars of input to 5 unsigned chars */
	if (sscanf(in, "%2hx%2hx%2hx%2hx%2hx", &inv[0], &inv[1], &inv[2], &inv[3], &inv[4]) != 5)
		return 1;

	/* X-Rite magic... */
	inv[0] ^= key[0];		/* All seen to have 2 bits set in each nibble. */
	inv[1] ^= key[1];		/* ie. taken from set 3,5,6,9,A,C ? */
	inv[2] ^= key[2];
	inv[4] ^= key[3];
	outv = ((inv[0] * 256 + inv[2]) ^ (inv[4] * 256 + inv[1])) + inv[4];

	sprintf(out, "%04x", outv);
	return 0;
}
