[libsigrok.git] / hardware / common / dmm / metex14.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2012-2013 Uwe Hermann <uwe@hermann-uwe.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

/**
 * @file
 *
 * Metex 14-bytes ASCII protocol parser.
 *
 * @internal
 * This should work for various multimeters which use this kind of protocol,
 * even though there is some variation in which modes each DMM supports.
 *
 * It does _not_ work for all Metex DMMs, some use a quite different protocol.
 */

#include <string.h>
#include <ctype.h>
#include <math.h>
#include <glib.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"

#define LOG_PREFIX "metex14"

/** Parse value from buf, byte 2-8. */
static int parse_value(const uint8_t *buf, struct metex14_info *info,
			float *result)
{
	int i, is_ol, cnt;
	char valstr[7 + 1];

	/* Strip all spaces from bytes 2-8. */
	memset(&valstr, 0, 7 + 1);
	for (i = 0, cnt = 0; i < 7; i++) {
		if (buf[2 + i] != ' ')
			valstr[cnt++] = buf[2 + i];
	}

	/* Bytes 5-7: Over limit (various forms) */
	is_ol = 0;
	is_ol += (!strcasecmp((const char *)&valstr, ".OL")) ? 1 : 0;
	is_ol += (!strcasecmp((const char *)&valstr, "O.L")) ? 1 : 0;
	is_ol += (!strcasecmp((const char *)&valstr, "OL.")) ? 1 : 0;
	is_ol += (!strcasecmp((const char *)&valstr, "OL")) ? 1 : 0;
	is_ol += (!strcasecmp((const char *)&valstr, "-.OL")) ? 1 : 0;
	is_ol += (!strcasecmp((const char *)&valstr, "-O.L")) ? 1 : 0;
	is_ol += (!strcasecmp((const char *)&valstr, "-OL.")) ? 1 : 0;
	is_ol += (!strcasecmp((const char *)&valstr, "-OL")) ? 1 : 0;
	if (is_ol != 0) {
		sr_spew("Over limit.");
		*result = INFINITY;
		return SR_OK;
	}

	/* Logic functions */
	if (!strcmp((const char *)&valstr, "READY") ||
			!strcmp((const char *)&valstr, "FLOAT")) {
		*result = INFINITY;
		info->is_logic = TRUE;
	} else if (!strcmp((const char *)&valstr, "Hi")) {
		*result = 1.0;
		info->is_logic = TRUE;
	} else if (!strcmp((const char *)&valstr, "Lo")) {
		*result = 0.0;
		info->is_logic = TRUE;
	}
	if (info->is_logic)
		return SR_OK;

	/* Bytes 2-8: Sign, value (up to 5 digits) and decimal point */
	sscanf((const char *)&valstr, "%f", result);

	sr_spew("The display value is %f.", *result);

	return SR_OK;
}

static void parse_flags(const char *buf, struct metex14_info *info)
{
	int i, cnt;
	char unit[4 + 1];
	const char *u;

	/* Bytes 0-1: Measurement mode AC, DC */
	info->is_ac = !strncmp(buf, "AC", 2);
	info->is_dc = !strncmp(buf, "DC", 2);

	/* Bytes 2-8: See parse_value(). */

	/* Strip all spaces from bytes 9-12. */
	memset(&unit, 0, 4 + 1);
	for (i = 0, cnt = 0; i < 4; i++) {
		if (buf[9 + i] != ' ')
			unit[cnt++] = buf[9 + i];
	}

	/* Bytes 9-12: Unit */
	u = (const char *)&unit;
	if (!strcasecmp(u, "A"))
		info->is_ampere = TRUE;
	else if (!strcasecmp(u, "mA"))
		info->is_milli = info->is_ampere = TRUE;
	else if (!strcasecmp(u, "uA"))
		info->is_micro = info->is_ampere = TRUE;
	else if (!strcasecmp(u, "V"))
		info->is_volt = TRUE;
	else if (!strcasecmp(u, "mV"))
		info->is_milli = info->is_volt = TRUE;
	else if (!strcasecmp(u, "Ohm"))
		info->is_ohm = TRUE;
	else if (!strcasecmp(u, "KOhm"))
		info->is_kilo = info->is_ohm = TRUE;
	else if (!strcasecmp(u, "MOhm"))
		info->is_mega = info->is_ohm = TRUE;
	else if (!strcasecmp(u, "pF"))
		info->is_pico = info->is_farad = TRUE;
	else if (!strcasecmp(u, "nF"))
		info->is_nano = info->is_farad = TRUE;
	else if (!strcasecmp(u, "uF"))
		info->is_micro = info->is_farad = TRUE;
	else if (!strcasecmp(u, "KHz"))
		info->is_kilo = info->is_hertz = TRUE;
	else if (!strcasecmp(u, "C"))
		info->is_celsius = TRUE;
	else if (!strcasecmp(u, "DB"))
		info->is_decibel = TRUE;
	else if (!strcasecmp(u, ""))
		info->is_unitless = TRUE;

	/* Bytes 0-1: Measurement mode, except AC/DC */
	info->is_resistance  = !strncmp(buf, "OH", 2) ||
		(!strncmp(buf, "  ", 2) && info->is_ohm);
	info->is_capacity    = !strncmp(buf, "CA", 2) ||
		(!strncmp(buf, "  ", 2) && info->is_farad);
	info->is_temperature = !strncmp(buf, "TE", 2);
	info->is_diode       = !strncmp(buf, "DI", 2) ||
		(!strncmp(buf, "  ", 2) && info->is_volt && info->is_milli);
	info->is_frequency   = !strncmp(buf, "FR", 2) ||
		(!strncmp(buf, "  ", 2) && info->is_hertz);
	info->is_gain        = !strncmp(buf, "DB", 2);
	info->is_hfe         = !strncmp(buf, "HF", 2) ||
		(!strncmp(buf, "  ", 2) && !info->is_volt && !info->is_ohm &&
		 !info->is_logic && !info->is_farad && !info->is_hertz);
	/*
	 * Note:
	 * - Protocol doesn't distinguish "resistance" from "beep" mode.
	 * - "DB" shows the logarithmic ratio of input voltage to a
	 *   pre-stored (user-changeable) value in the DMM.
	 */

	/* Byte 13: Always '\r' (carriage return, 0x0d, 13) */
}

static void handle_flags(struct sr_datafeed_analog *analog, float *floatval,
			 const struct metex14_info *info)
{
	/* Factors */
	if (info->is_pico)
		*floatval /= 1000000000000ULL;
	if (info->is_nano)
		*floatval /= 1000000000;
	if (info->is_micro)
		*floatval /= 1000000;
	if (info->is_milli)
		*floatval /= 1000;
	if (info->is_kilo)
		*floatval *= 1000;
	if (info->is_mega)
		*floatval *= 1000000;

	/* Measurement modes */
	if (info->is_volt) {
		analog->mq = SR_MQ_VOLTAGE;
		analog->unit = SR_UNIT_VOLT;
	}
	if (info->is_ampere) {
		analog->mq = SR_MQ_CURRENT;
		analog->unit = SR_UNIT_AMPERE;
	}
	if (info->is_ohm) {
		analog->mq = SR_MQ_RESISTANCE;
		analog->unit = SR_UNIT_OHM;
	}
	if (info->is_hertz) {
		analog->mq = SR_MQ_FREQUENCY;
		analog->unit = SR_UNIT_HERTZ;
	}
	if (info->is_farad) {
		analog->mq = SR_MQ_CAPACITANCE;
		analog->unit = SR_UNIT_FARAD;
	}
	if (info->is_celsius) {
		analog->mq = SR_MQ_TEMPERATURE;
		analog->unit = SR_UNIT_CELSIUS;
	}
	if (info->is_diode) {
		analog->mq = SR_MQ_VOLTAGE;
		analog->unit = SR_UNIT_VOLT;
	}
	if (info->is_gain) {
		analog->mq = SR_MQ_GAIN;
		analog->unit = SR_UNIT_DECIBEL_VOLT;
	}
	if (info->is_hfe) {
		analog->mq = SR_MQ_GAIN;
		analog->unit = SR_UNIT_UNITLESS;
	}
	if (info->is_logic) {
		analog->mq = SR_MQ_GAIN;
		analog->unit = SR_UNIT_UNITLESS;
	}

	/* Measurement related flags */
	if (info->is_ac)
		analog->mqflags |= SR_MQFLAG_AC;
	if (info->is_dc)
		analog->mqflags |= SR_MQFLAG_DC;
	if (info->is_diode)
		analog->mqflags |= SR_MQFLAG_DIODE;
}

static gboolean flags_valid(const struct metex14_info *info)
{
	int count;

	/* Does the packet have more than one multiplier? */
	count = 0;
	count += (info->is_pico) ? 1 : 0;
	count += (info->is_nano) ? 1 : 0;
	count += (info->is_micro) ? 1 : 0;
	count += (info->is_milli) ? 1 : 0;
	count += (info->is_kilo) ? 1 : 0;
	count += (info->is_mega) ? 1 : 0;
	if (count > 1) {
		sr_dbg("More than one multiplier detected in packet.");
		return FALSE;
	}

	/* Does the packet "measure" more than one type of value? */
	count = 0;
	count += (info->is_ac) ? 1 : 0;
	count += (info->is_dc) ? 1 : 0;
	count += (info->is_resistance) ? 1 : 0;
	count += (info->is_capacity) ? 1 : 0;
	count += (info->is_temperature) ? 1 : 0;
	count += (info->is_diode) ? 1 : 0;
	count += (info->is_frequency) ? 1 : 0;
	if (count > 1) {
		sr_dbg("More than one measurement type detected in packet.");
		return FALSE;
	}

	/* Both AC and DC set? */
	if (info->is_ac && info->is_dc) {
		sr_dbg("Both AC and DC flags detected in packet.");
		return FALSE;
	}

	return TRUE;
}

#ifdef HAVE_LIBSERIALPORT
SR_PRIV int sr_metex14_packet_request(struct sr_serial_dev_inst *serial)
{
	const uint8_t wbuf = 'D';

	sr_spew("Requesting DMM packet.");

	return (serial_write(serial, &wbuf, 1) == 1) ? SR_OK : SR_ERR;
}
#endif

SR_PRIV gboolean sr_metex14_packet_valid(const uint8_t *buf)
{
	struct metex14_info info;

	memset(&info, 0x00, sizeof(struct metex14_info));
	parse_flags((const char *)buf, &info);

	if (!flags_valid(&info))
		return FALSE;

	if (buf[13] != '\r')
		return FALSE;

	return TRUE;
}

/**
 * Parse a protocol packet.
 *
 * @param buf Buffer containing the protocol packet. Must not be NULL.
 * @param floatval Pointer to a float variable. That variable will be modified
 *                 in-place depending on the protocol packet. Must not be NULL.
 * @param analog Pointer to a struct sr_datafeed_analog. The struct will be
 *               filled with data according to the protocol packet.
 *               Must not be NULL.
 * @param info Pointer to a struct metex14_info. The struct will be filled
 *             with data according to the protocol packet. Must not be NULL.
 *
 * @return SR_OK upon success, SR_ERR upon failure. Upon errors, the
 *         'analog' variable contents are undefined and should not be used.
 */
SR_PRIV int sr_metex14_parse(const uint8_t *buf, float *floatval,
			     struct sr_datafeed_analog *analog, void *info)
{
	int ret;
	struct metex14_info *info_local;

	info_local = (struct metex14_info *)info;

	/* Don't print byte 13. That one contains the carriage return. */
	sr_dbg("DMM packet: \"%.13s\"", buf);

	memset(info_local, 0x00, sizeof(struct metex14_info));

	if ((ret = parse_value(buf, info_local, floatval)) != SR_OK) {
		sr_dbg("Error parsing value: %d.", ret);
		return ret;
	}

	parse_flags((const char *)buf, info_local);
	handle_flags(analog, floatval, info_local);

	return SR_OK;
}
Commit	Line	Data
ac913e5c	1	/*
50985c20	2	* This file is part of the libsigrok project.
ac913e5c	3	*
71f1302b	4	* Copyright (C) 2012-2013 Uwe Hermann <uwe@hermann-uwe.de>
ac913e5c UH	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
e83437ae MH	21	/**
	22	* @file
	23	*
ac913e5c UH	24	* Metex 14-bytes ASCII protocol parser.
ac913e5c UH	25	*
e83437ae	26	* @internal
ac913e5c UH	27	* This should work for various multimeters which use this kind of protocol,
	28	* even though there is some variation in which modes each DMM supports.
	29	*
	30	* It does _not_ work for all Metex DMMs, some use a quite different protocol.
	31	*/
	32
	33	#include <string.h>
	34	#include <ctype.h>
	35	#include <math.h>
	36	#include <glib.h>
	37	#include "libsigrok.h"
	38	#include "libsigrok-internal.h"
	39
3544f848	40	#define LOG_PREFIX "metex14"
ac913e5c	41
e83437ae MH	42	/** Parse value from buf, byte 2-8. */
	43	static int parse_value(const uint8_t buf, struct metex14_info info,
	44	float *result)
ac913e5c	45	{
1a807c13 UH	46	int i, is_ol, cnt;
	47	char valstr[7 + 1];
	48
	49	/* Strip all spaces from bytes 2-8. */
	50	memset(&valstr, 0, 7 + 1);
	51	for (i = 0, cnt = 0; i < 7; i++) {
	52	if (buf[2 + i] != ' ')
	53	valstr[cnt++] = buf[2 + i];
ac913e5c UH	54	}
	55
	56	/* Bytes 5-7: Over limit (various forms) */
	57	is_ol = 0;
ee6cb5a4 UH	58	is_ol += (!strcasecmp((const char *)&valstr, ".OL")) ? 1 : 0;
	59	is_ol += (!strcasecmp((const char *)&valstr, "O.L")) ? 1 : 0;
	60	is_ol += (!strcasecmp((const char *)&valstr, "OL.")) ? 1 : 0;
	61	is_ol += (!strcasecmp((const char *)&valstr, "OL")) ? 1 : 0;
3a8cad91 UH	62	is_ol += (!strcasecmp((const char *)&valstr, "-.OL")) ? 1 : 0;
	63	is_ol += (!strcasecmp((const char *)&valstr, "-O.L")) ? 1 : 0;
	64	is_ol += (!strcasecmp((const char *)&valstr, "-OL.")) ? 1 : 0;
	65	is_ol += (!strcasecmp((const char *)&valstr, "-OL")) ? 1 : 0;
ac913e5c UH	66	if (is_ol != 0) {
	67	sr_spew("Over limit.");
	68	*result = INFINITY;
	69	return SR_OK;
	70	}
	71
e83437ae MH	72	/* Logic functions */
	73	if (!strcmp((const char *)&valstr, "READY") \|\|
	74	!strcmp((const char *)&valstr, "FLOAT")) {
	75	*result = INFINITY;
	76	info->is_logic = TRUE;
	77	} else if (!strcmp((const char *)&valstr, "Hi")) {
	78	*result = 1.0;
	79	info->is_logic = TRUE;
	80	} else if (!strcmp((const char *)&valstr, "Lo")) {
	81	*result = 0.0;
	82	info->is_logic = TRUE;
	83	}
	84	if (info->is_logic)
	85	return SR_OK;
	86
1a807c13 UH	87	/* Bytes 2-8: Sign, value (up to 5 digits) and decimal point */
1a807c13 UH	88	sscanf((const char *)&valstr, "%f", result);
ac913e5c	89
1a807c13	90	sr_spew("The display value is %f.", *result);
ac913e5c UH	91
	92	return SR_OK;
	93	}
	94
	95	static void parse_flags(const char buf, struct metex14_info info)
	96	{
71f1302b UH	97	int i, cnt;
	98	char unit[4 + 1];
	99	const char *u;
	100
e83437ae MH	101	/* Bytes 0-1: Measurement mode AC, DC */
	102	info->is_ac = !strncmp(buf, "AC", 2);
	103	info->is_dc = !strncmp(buf, "DC", 2);
ac913e5c	104
1a807c13	105	/* Bytes 2-8: See parse_value(). */
ac913e5c	106
1a807c13	107	/* Strip all spaces from bytes 9-12. */
71f1302b UH	108	memset(&unit, 0, 4 + 1);
	109	for (i = 0, cnt = 0; i < 4; i++) {
	110	if (buf[9 + i] != ' ')
	111	unit[cnt++] = buf[9 + i];
	112	}
1a807c13 UH	113
1a807c13 UH	114	/* Bytes 9-12: Unit */
71f1302b	115	u = (const char *)&unit;
ee6cb5a4	116	if (!strcasecmp(u, "A"))
ac913e5c	117	info->is_ampere = TRUE;
ee6cb5a4	118	else if (!strcasecmp(u, "mA"))
ac913e5c	119	info->is_milli = info->is_ampere = TRUE;
ee6cb5a4	120	else if (!strcasecmp(u, "uA"))
2477fb95	121	info->is_micro = info->is_ampere = TRUE;
ee6cb5a4	122	else if (!strcasecmp(u, "V"))
ac913e5c	123	info->is_volt = TRUE;
ee6cb5a4	124	else if (!strcasecmp(u, "mV"))
ac913e5c	125	info->is_milli = info->is_volt = TRUE;
ee6cb5a4	126	else if (!strcasecmp(u, "Ohm"))
ac913e5c	127	info->is_ohm = TRUE;
ee6cb5a4	128	else if (!strcasecmp(u, "KOhm"))
ac913e5c	129	info->is_kilo = info->is_ohm = TRUE;
ee6cb5a4	130	else if (!strcasecmp(u, "MOhm"))
ac913e5c	131	info->is_mega = info->is_ohm = TRUE;
c02dc3e2 UH	132	else if (!strcasecmp(u, "pF"))
c02dc3e2 UH	133	info->is_pico = info->is_farad = TRUE;
ee6cb5a4	134	else if (!strcasecmp(u, "nF"))
ac913e5c	135	info->is_nano = info->is_farad = TRUE;
ee6cb5a4	136	else if (!strcasecmp(u, "uF"))
ac913e5c	137	info->is_micro = info->is_farad = TRUE;
ee6cb5a4	138	else if (!strcasecmp(u, "KHz"))
ac913e5c	139	info->is_kilo = info->is_hertz = TRUE;
ee6cb5a4	140	else if (!strcasecmp(u, "C"))
ac913e5c	141	info->is_celsius = TRUE;
ee6cb5a4	142	else if (!strcasecmp(u, "DB"))
9871215c	143	info->is_decibel = TRUE;
ee6cb5a4	144	else if (!strcasecmp(u, ""))
9871215c	145	info->is_unitless = TRUE;
ac913e5c	146
e83437ae MH	147	/* Bytes 0-1: Measurement mode, except AC/DC */
	148	info->is_resistance = !strncmp(buf, "OH", 2) \|\|
	149	(!strncmp(buf, " ", 2) && info->is_ohm);
	150	info->is_capacity = !strncmp(buf, "CA", 2) \|\|
	151	(!strncmp(buf, " ", 2) && info->is_farad);
	152	info->is_temperature = !strncmp(buf, "TE", 2);
	153	info->is_diode = !strncmp(buf, "DI", 2) \|\|
	154	(!strncmp(buf, " ", 2) && info->is_volt && info->is_milli);
	155	info->is_frequency = !strncmp(buf, "FR", 2) \|\|
	156	(!strncmp(buf, " ", 2) && info->is_hertz);
	157	info->is_gain = !strncmp(buf, "DB", 2);
	158	info->is_hfe = !strncmp(buf, "HF", 2) \|\|
	159	(!strncmp(buf, " ", 2) && !info->is_volt && !info->is_ohm &&
	160	!info->is_logic && !info->is_farad && !info->is_hertz);
	161	/*
	162	* Note:
	163	* - Protocol doesn't distinguish "resistance" from "beep" mode.
	164	* - "DB" shows the logarithmic ratio of input voltage to a
	165	* pre-stored (user-changeable) value in the DMM.
	166	*/
	167
ac913e5c UH	168	/* Byte 13: Always '\r' (carriage return, 0x0d, 13) */
	169	}
	170
	171	static void handle_flags(struct sr_datafeed_analog analog, float floatval,
	172	const struct metex14_info *info)
	173	{
	174	/* Factors */
c02dc3e2 UH	175	if (info->is_pico)
c02dc3e2 UH	176	*floatval /= 1000000000000ULL;
ac913e5c UH	177	if (info->is_nano)
	178	*floatval /= 1000000000;
	179	if (info->is_micro)
	180	*floatval /= 1000000;
	181	if (info->is_milli)
	182	*floatval /= 1000;
	183	if (info->is_kilo)
	184	floatval = 1000;
	185	if (info->is_mega)
	186	floatval = 1000000;
	187
	188	/* Measurement modes */
	189	if (info->is_volt) {
	190	analog->mq = SR_MQ_VOLTAGE;
	191	analog->unit = SR_UNIT_VOLT;
	192	}
	193	if (info->is_ampere) {
	194	analog->mq = SR_MQ_CURRENT;
	195	analog->unit = SR_UNIT_AMPERE;
	196	}
	197	if (info->is_ohm) {
	198	analog->mq = SR_MQ_RESISTANCE;
	199	analog->unit = SR_UNIT_OHM;
	200	}
	201	if (info->is_hertz) {
	202	analog->mq = SR_MQ_FREQUENCY;
	203	analog->unit = SR_UNIT_HERTZ;
	204	}
	205	if (info->is_farad) {
	206	analog->mq = SR_MQ_CAPACITANCE;
	207	analog->unit = SR_UNIT_FARAD;
	208	}
	209	if (info->is_celsius) {
	210	analog->mq = SR_MQ_TEMPERATURE;
	211	analog->unit = SR_UNIT_CELSIUS;
	212	}
	213	if (info->is_diode) {
	214	analog->mq = SR_MQ_VOLTAGE;
	215	analog->unit = SR_UNIT_VOLT;
	216	}
9871215c UH	217	if (info->is_gain) {
	218	analog->mq = SR_MQ_GAIN;
	219	analog->unit = SR_UNIT_DECIBEL_VOLT;
	220	}
	221	if (info->is_hfe) {
	222	analog->mq = SR_MQ_GAIN;
	223	analog->unit = SR_UNIT_UNITLESS;
	224	}
e83437ae MH	225	if (info->is_logic) {
	226	analog->mq = SR_MQ_GAIN;
	227	analog->unit = SR_UNIT_UNITLESS;
	228	}
ac913e5c UH	229
	230	/* Measurement related flags */
	231	if (info->is_ac)
	232	analog->mqflags \|= SR_MQFLAG_AC;
	233	if (info->is_dc)
	234	analog->mqflags \|= SR_MQFLAG_DC;
a6ed50f4 UH	235	if (info->is_diode)
a6ed50f4 UH	236	analog->mqflags \|= SR_MQFLAG_DIODE;
ac913e5c UH	237	}
	238
	239	static gboolean flags_valid(const struct metex14_info *info)
	240	{
	241	int count;
	242
	243	/* Does the packet have more than one multiplier? */
	244	count = 0;
c02dc3e2	245	count += (info->is_pico) ? 1 : 0;
ac913e5c UH	246	count += (info->is_nano) ? 1 : 0;
	247	count += (info->is_micro) ? 1 : 0;
	248	count += (info->is_milli) ? 1 : 0;
	249	count += (info->is_kilo) ? 1 : 0;
	250	count += (info->is_mega) ? 1 : 0;
	251	if (count > 1) {
ec5186f9	252	sr_dbg("More than one multiplier detected in packet.");
ac913e5c UH	253	return FALSE;
	254	}
	255
	256	/* Does the packet "measure" more than one type of value? */
	257	count = 0;
	258	count += (info->is_ac) ? 1 : 0;
	259	count += (info->is_dc) ? 1 : 0;
	260	count += (info->is_resistance) ? 1 : 0;
	261	count += (info->is_capacity) ? 1 : 0;
	262	count += (info->is_temperature) ? 1 : 0;
	263	count += (info->is_diode) ? 1 : 0;
	264	count += (info->is_frequency) ? 1 : 0;
	265	if (count > 1) {
ec5186f9	266	sr_dbg("More than one measurement type detected in packet.");
ac913e5c UH	267	return FALSE;
	268	}
	269
	270	/* Both AC and DC set? */
	271	if (info->is_ac && info->is_dc) {
ec5186f9	272	sr_dbg("Both AC and DC flags detected in packet.");
ac913e5c UH	273	return FALSE;
	274	}
	275
	276	return TRUE;
	277	}
	278
c4f2dfd0	279	#ifdef HAVE_LIBSERIALPORT
e90cf076 UH	280	SR_PRIV int sr_metex14_packet_request(struct sr_serial_dev_inst *serial)
	281	{
	282	const uint8_t wbuf = 'D';
	283
	284	sr_spew("Requesting DMM packet.");
	285
	286	return (serial_write(serial, &wbuf, 1) == 1) ? SR_OK : SR_ERR;
	287	}
c4f2dfd0	288	#endif
e90cf076	289
ac913e5c UH	290	SR_PRIV gboolean sr_metex14_packet_valid(const uint8_t *buf)
	291	{
	292	struct metex14_info info;
	293
	294	memset(&info, 0x00, sizeof(struct metex14_info));
	295	parse_flags((const char *)buf, &info);
	296
	297	if (!flags_valid(&info))
	298	return FALSE;
	299
	300	if (buf[13] != '\r')
	301	return FALSE;
	302
	303	return TRUE;
	304	}
	305
	306	/**
	307	* Parse a protocol packet.
	308	*
1fbab466	309	* @param buf Buffer containing the protocol packet. Must not be NULL.
ac913e5c	310	* @param floatval Pointer to a float variable. That variable will be modified
1fbab466	311	* in-place depending on the protocol packet. Must not be NULL.
ac913e5c UH	312	* @param analog Pointer to a struct sr_datafeed_analog. The struct will be
ac913e5c UH	313	* filled with data according to the protocol packet.
1fbab466 UH	314	* Must not be NULL.
	315	* @param info Pointer to a struct metex14_info. The struct will be filled
	316	* with data according to the protocol packet. Must not be NULL.
ac913e5c UH	317	*
	318	* @return SR_OK upon success, SR_ERR upon failure. Upon errors, the
	319	* 'analog' variable contents are undefined and should not be used.
	320	*/
	321	SR_PRIV int sr_metex14_parse(const uint8_t buf, float floatval,
1fbab466	322	struct sr_datafeed_analog analog, void info)
ac913e5c UH	323	{
ac913e5c UH	324	int ret;
1fbab466 UH	325	struct metex14_info *info_local;
	326
	327	info_local = (struct metex14_info *)info;
ac913e5c	328
e82d7dbc AG	329	/* Don't print byte 13. That one contains the carriage return. */
	330	sr_dbg("DMM packet: \"%.13s\"", buf);
	331
e83437ae MH	332	memset(info_local, 0x00, sizeof(struct metex14_info));
	333
	334	if ((ret = parse_value(buf, info_local, floatval)) != SR_OK) {
ec5186f9	335	sr_dbg("Error parsing value: %d.", ret);
ac913e5c UH	336	return ret;
	337	}
	338
1fbab466 UH	339	parse_flags((const char *)buf, info_local);
1fbab466 UH	340	handle_flags(analog, floatval, info_local);
ac913e5c UH	341
	342	return SR_OK;
	343	}