[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
 */

/*
 * Metex 14-bytes ASCII protocol parser.
 *
 * 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"

/* Message logging helpers with subsystem-specific prefix string. */
#define LOG_PREFIX "metex14: "
#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)

static int parse_value(const uint8_t *buf, float *result)
{
	int i, sign, intval = 0, factor, decimal_point = 0, is_ol;
	float floatval;
	uint8_t digit;

	/* Byte 3: Sign (' ' or '-') */
	if (buf[3] == ' ') {
		sign = 1;
	} else if (buf[3] == '-') {
		sign = -1;
	} else {
		sr_err("Invalid sign byte: 0x%02x.", buf[3]);
		return SR_ERR;
	}

	/* Bytes 5-7: Over limit (various forms) */
	is_ol = 0;
	is_ol += (!strncmp((char *)&buf[5], ".OL", 3)) ? 1 : 0;
	is_ol += (!strncmp((char *)&buf[5], "O.L", 3)) ? 1 : 0;
	is_ol += (!strncmp((char *)&buf[5], "OL.", 3)) ? 1 : 0;
	is_ol += (!strncmp((char *)&buf[5], " OL", 3)) ? 1 : 0;
	if (is_ol != 0) {
		sr_spew("Over limit.");
		*result = INFINITY;
		return SR_OK;
	}

	/* Bytes 4-8: Value (up to 4 digits) and decimal point */
	factor = 1000;
	for (i = 0; i < 5; i++) {
		digit = buf[4 + i];
		/* Convert spaces to '0', so that we can parse them. */
		if (digit == ' ')
			digit = '0';
		if (digit == '.') {
			decimal_point = i;
		} else if (isdigit(digit)) {
			intval += (digit - '0') * factor;
			factor /= 10;
		} else {
			sr_err("Invalid digit byte: 0x%02x.", digit);
			return SR_ERR;
		}
	}

	floatval = (float)intval;

	/* Decimal point position */
	if (decimal_point == 0 || decimal_point == 4) {
		/* TODO: Doesn't happen? */
	} else if (decimal_point == 1) {
		floatval /= 1000;
	} else if (decimal_point == 2) {
		floatval /= 100;
	} else if (decimal_point == 3) {
		floatval /= 10;
	} else {
		sr_err("Invalid decimal point position: %d.", decimal_point);
		return SR_ERR;
	}

	/* Apply sign. */
	floatval *= sign;

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

	*result = floatval;

	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 */
	/* Note: Protocol doesn't distinguish "resistance" from "beep" mode. */
	info->is_ac          = !strncmp(buf, "AC", 2);
	info->is_dc          = !strncmp(buf, "DC", 2);
	info->is_resistance  = !strncmp(buf, "OH", 2);
	info->is_capacity    = !strncmp(buf, "CA", 2);
	info->is_temperature = !strncmp(buf, "TE", 2);
	info->is_diode       = !strncmp(buf, "DI", 2);
	info->is_frequency   = !strncmp(buf, "FR", 2);
	info->is_gain        = !strncmp(buf, "DB", 2);
	info->is_hfe         = !strncmp(buf, "HF", 2);

	/*
	 * Note: "DB" shows the logarithmic ratio of input voltage to a
	 * pre-stored (user-changeable) value in the DMM.
	 */

	if (info->is_dc || info->is_ac)
		info->is_volt = TRUE;

	/* Byte 2: Always space (0x20). */

	/* Bytes 3-8: See parse_value(). */

	/* Bytes 9-12: Unit */
	memset(&unit, 0, 4 + 1);
	for (i = 0, cnt = 0; i < 4; i++) {
		if (buf[9 + i] != ' ')
			unit[cnt++] = buf[9 + i];
	}
	u = (const char *)&unit;
	if (!strcmp(u, "A"))
		info->is_ampere = TRUE;
	else if (!strcmp(u, "mA"))
		info->is_milli = info->is_ampere = TRUE;
	else if (!strcmp(u, "uA"))
		info->is_micro = info->is_ampere = TRUE;
	else if (!strcmp(u, "V"))
		info->is_volt = TRUE;
	else if (!strcmp(u, "mV"))
		info->is_milli = info->is_volt = TRUE;
	else if (!strcmp(u, "Ohm"))
		info->is_ohm = TRUE;
	else if (!strcmp(u, "KOhm"))
		info->is_kilo = info->is_ohm = TRUE;
	else if (!strcmp(u, "MOhm"))
		info->is_mega = info->is_ohm = TRUE;
	else if (!strcmp(u, "nF"))
		info->is_nano = info->is_farad = TRUE;
	else if (!strcmp(u, "uF"))
		info->is_micro = info->is_farad = TRUE;
	else if (!strcmp(u, "KHz"))
		info->is_kilo = info->is_hertz = TRUE;
	else if (!strcmp(u, "C"))
		info->is_celsius = TRUE;
	else if (!strcmp(u, "DB"))
		info->is_decibel = TRUE;
	else if (!strcmp(u, ""))
		info->is_unitless = TRUE;

	/* 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_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;
	}

	/* 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_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_err("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_err("More than one measurement type detected in packet.");
		return FALSE;
	}

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

	return TRUE;
}

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;
}

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);

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

	memset(info_local, 0x00, sizeof(struct metex14_info));
	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
	21	/*
	22	* Metex 14-bytes ASCII protocol parser.
	23	*
	24	* This should work for various multimeters which use this kind of protocol,
	25	* even though there is some variation in which modes each DMM supports.
	26	*
	27	* It does _not_ work for all Metex DMMs, some use a quite different protocol.
	28	*/
	29
	30	#include <string.h>
	31	#include <ctype.h>
	32	#include <math.h>
	33	#include <glib.h>
	34	#include "libsigrok.h"
	35	#include "libsigrok-internal.h"
	36
29a27196 UH	37	/* Message logging helpers with subsystem-specific prefix string. */
	38	#define LOG_PREFIX "metex14: "
	39	#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
	40	#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
	41	#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
	42	#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
	43	#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
	44	#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
ac913e5c UH	45
	46	static int parse_value(const uint8_t buf, float result)
	47	{
	48	int i, sign, intval = 0, factor, decimal_point = 0, is_ol;
	49	float floatval;
	50	uint8_t digit;
	51
	52	/* Byte 3: Sign (' ' or '-') */
	53	if (buf[3] == ' ') {
	54	sign = 1;
	55	} else if (buf[3] == '-') {
	56	sign = -1;
	57	} else {
	58	sr_err("Invalid sign byte: 0x%02x.", buf[3]);
	59	return SR_ERR;
	60	}
	61
	62	/* Bytes 5-7: Over limit (various forms) */
	63	is_ol = 0;
8f46911e UH	64	is_ol += (!strncmp((char *)&buf[5], ".OL", 3)) ? 1 : 0;
	65	is_ol += (!strncmp((char *)&buf[5], "O.L", 3)) ? 1 : 0;
	66	is_ol += (!strncmp((char *)&buf[5], "OL.", 3)) ? 1 : 0;
	67	is_ol += (!strncmp((char *)&buf[5], " OL", 3)) ? 1 : 0;
ac913e5c UH	68	if (is_ol != 0) {
	69	sr_spew("Over limit.");
	70	*result = INFINITY;
	71	return SR_OK;
	72	}
	73
	74	/* Bytes 4-8: Value (up to 4 digits) and decimal point */
	75	factor = 1000;
	76	for (i = 0; i < 5; i++) {
	77	digit = buf[4 + i];
76b55dfa AG	78	/* Convert spaces to '0', so that we can parse them. */
	79	if (digit == ' ')
	80	digit = '0';
ac913e5c UH	81	if (digit == '.') {
	82	decimal_point = i;
	83	} else if (isdigit(digit)) {
	84	intval += (digit - '0') * factor;
	85	factor /= 10;
	86	} else {
	87	sr_err("Invalid digit byte: 0x%02x.", digit);
	88	return SR_ERR;
	89	}
	90	}
	91
	92	floatval = (float)intval;
	93
	94	/* Decimal point position */
	95	if (decimal_point == 0 \|\| decimal_point == 4) {
	96	/* TODO: Doesn't happen? */
	97	} else if (decimal_point == 1) {
	98	floatval /= 1000;
	99	} else if (decimal_point == 2) {
	100	floatval /= 100;
	101	} else if (decimal_point == 3) {
	102	floatval /= 10;
	103	} else {
	104	sr_err("Invalid decimal point position: %d.", decimal_point);
	105	return SR_ERR;
	106	}
	107
	108	/* Apply sign. */
	109	floatval *= sign;
	110
	111	sr_spew("The display value is %f.", floatval);
	112
	113	*result = floatval;
	114
	115	return SR_OK;
	116	}
	117
	118	static void parse_flags(const char buf, struct metex14_info info)
	119	{
71f1302b UH	120	int i, cnt;
	121	char unit[4 + 1];
	122	const char *u;
	123
ac913e5c UH	124	/* Bytes 0-1: Measurement mode */
	125	/* Note: Protocol doesn't distinguish "resistance" from "beep" mode. */
	126	info->is_ac = !strncmp(buf, "AC", 2);
	127	info->is_dc = !strncmp(buf, "DC", 2);
	128	info->is_resistance = !strncmp(buf, "OH", 2);
	129	info->is_capacity = !strncmp(buf, "CA", 2);
	130	info->is_temperature = !strncmp(buf, "TE", 2);
	131	info->is_diode = !strncmp(buf, "DI", 2);
	132	info->is_frequency = !strncmp(buf, "FR", 2);
9871215c UH	133	info->is_gain = !strncmp(buf, "DB", 2);
	134	info->is_hfe = !strncmp(buf, "HF", 2);
	135
	136	/*
	137	* Note: "DB" shows the logarithmic ratio of input voltage to a
	138	* pre-stored (user-changeable) value in the DMM.
	139	*/
ac913e5c UH	140
	141	if (info->is_dc \|\| info->is_ac)
	142	info->is_volt = TRUE;
	143
	144	/* Byte 2: Always space (0x20). */
	145
	146	/* Bytes 3-8: See parse_value(). */
	147
	148	/* Bytes 9-12: Unit */
71f1302b UH	149	memset(&unit, 0, 4 + 1);
	150	for (i = 0, cnt = 0; i < 4; i++) {
	151	if (buf[9 + i] != ' ')
	152	unit[cnt++] = buf[9 + i];
	153	}
	154	u = (const char *)&unit;
	155	if (!strcmp(u, "A"))
ac913e5c	156	info->is_ampere = TRUE;
71f1302b	157	else if (!strcmp(u, "mA"))
ac913e5c	158	info->is_milli = info->is_ampere = TRUE;
71f1302b	159	else if (!strcmp(u, "uA"))
2477fb95	160	info->is_micro = info->is_ampere = TRUE;
71f1302b	161	else if (!strcmp(u, "V"))
ac913e5c	162	info->is_volt = TRUE;
71f1302b	163	else if (!strcmp(u, "mV"))
ac913e5c	164	info->is_milli = info->is_volt = TRUE;
71f1302b	165	else if (!strcmp(u, "Ohm"))
ac913e5c	166	info->is_ohm = TRUE;
71f1302b	167	else if (!strcmp(u, "KOhm"))
ac913e5c	168	info->is_kilo = info->is_ohm = TRUE;
71f1302b	169	else if (!strcmp(u, "MOhm"))
ac913e5c	170	info->is_mega = info->is_ohm = TRUE;
71f1302b	171	else if (!strcmp(u, "nF"))
ac913e5c	172	info->is_nano = info->is_farad = TRUE;
71f1302b	173	else if (!strcmp(u, "uF"))
ac913e5c	174	info->is_micro = info->is_farad = TRUE;
71f1302b	175	else if (!strcmp(u, "KHz"))
ac913e5c	176	info->is_kilo = info->is_hertz = TRUE;
71f1302b	177	else if (!strcmp(u, "C"))
ac913e5c	178	info->is_celsius = TRUE;
71f1302b	179	else if (!strcmp(u, "DB"))
9871215c	180	info->is_decibel = TRUE;
71f1302b	181	else if (!strcmp(u, ""))
9871215c	182	info->is_unitless = TRUE;
ac913e5c UH	183
	184	/* Byte 13: Always '\r' (carriage return, 0x0d, 13) */
	185	}
	186
	187	static void handle_flags(struct sr_datafeed_analog analog, float floatval,
	188	const struct metex14_info *info)
	189	{
	190	/* Factors */
	191	if (info->is_nano)
	192	*floatval /= 1000000000;
	193	if (info->is_micro)
	194	*floatval /= 1000000;
	195	if (info->is_milli)
	196	*floatval /= 1000;
	197	if (info->is_kilo)
	198	floatval = 1000;
	199	if (info->is_mega)
	200	floatval = 1000000;
	201
	202	/* Measurement modes */
	203	if (info->is_volt) {
	204	analog->mq = SR_MQ_VOLTAGE;
	205	analog->unit = SR_UNIT_VOLT;
	206	}
	207	if (info->is_ampere) {
	208	analog->mq = SR_MQ_CURRENT;
	209	analog->unit = SR_UNIT_AMPERE;
	210	}
	211	if (info->is_ohm) {
	212	analog->mq = SR_MQ_RESISTANCE;
	213	analog->unit = SR_UNIT_OHM;
	214	}
	215	if (info->is_hertz) {
	216	analog->mq = SR_MQ_FREQUENCY;
	217	analog->unit = SR_UNIT_HERTZ;
	218	}
	219	if (info->is_farad) {
	220	analog->mq = SR_MQ_CAPACITANCE;
	221	analog->unit = SR_UNIT_FARAD;
	222	}
	223	if (info->is_celsius) {
	224	analog->mq = SR_MQ_TEMPERATURE;
	225	analog->unit = SR_UNIT_CELSIUS;
	226	}
	227	if (info->is_diode) {
	228	analog->mq = SR_MQ_VOLTAGE;
	229	analog->unit = SR_UNIT_VOLT;
	230	}
9871215c UH	231	if (info->is_gain) {
	232	analog->mq = SR_MQ_GAIN;
	233	analog->unit = SR_UNIT_DECIBEL_VOLT;
	234	}
	235	if (info->is_hfe) {
	236	analog->mq = SR_MQ_GAIN;
	237	analog->unit = SR_UNIT_UNITLESS;
	238	}
ac913e5c UH	239
	240	/* Measurement related flags */
	241	if (info->is_ac)
	242	analog->mqflags \|= SR_MQFLAG_AC;
	243	if (info->is_dc)
	244	analog->mqflags \|= SR_MQFLAG_DC;
a6ed50f4 UH	245	if (info->is_diode)
a6ed50f4 UH	246	analog->mqflags \|= SR_MQFLAG_DIODE;
ac913e5c UH	247	}
	248
	249	static gboolean flags_valid(const struct metex14_info *info)
	250	{
	251	int count;
	252
	253	/* Does the packet have more than one multiplier? */
	254	count = 0;
	255	count += (info->is_nano) ? 1 : 0;
	256	count += (info->is_micro) ? 1 : 0;
	257	count += (info->is_milli) ? 1 : 0;
	258	count += (info->is_kilo) ? 1 : 0;
	259	count += (info->is_mega) ? 1 : 0;
	260	if (count > 1) {
	261	sr_err("More than one multiplier detected in packet.");
	262	return FALSE;
	263	}
	264
	265	/* Does the packet "measure" more than one type of value? */
	266	count = 0;
	267	count += (info->is_ac) ? 1 : 0;
	268	count += (info->is_dc) ? 1 : 0;
	269	count += (info->is_resistance) ? 1 : 0;
	270	count += (info->is_capacity) ? 1 : 0;
	271	count += (info->is_temperature) ? 1 : 0;
	272	count += (info->is_diode) ? 1 : 0;
	273	count += (info->is_frequency) ? 1 : 0;
	274	if (count > 1) {
	275	sr_err("More than one measurement type detected in packet.");
	276	return FALSE;
	277	}
	278
	279	/* Both AC and DC set? */
	280	if (info->is_ac && info->is_dc) {
	281	sr_err("Both AC and DC flags detected in packet.");
	282	return FALSE;
	283	}
	284
	285	return TRUE;
	286	}
	287
e90cf076 UH	288	SR_PRIV int sr_metex14_packet_request(struct sr_serial_dev_inst *serial)
	289	{
	290	const uint8_t wbuf = 'D';
	291
	292	sr_spew("Requesting DMM packet.");
	293
	294	return (serial_write(serial, &wbuf, 1) == 1) ? SR_OK : SR_ERR;
	295	}
	296
ac913e5c UH	297	SR_PRIV gboolean sr_metex14_packet_valid(const uint8_t *buf)
	298	{
	299	struct metex14_info info;
	300
	301	memset(&info, 0x00, sizeof(struct metex14_info));
	302	parse_flags((const char *)buf, &info);
	303
	304	if (!flags_valid(&info))
	305	return FALSE;
	306
	307	if (buf[13] != '\r')
	308	return FALSE;
	309
	310	return TRUE;
	311	}
	312
	313	/**
	314	* Parse a protocol packet.
	315	*
1fbab466	316	* @param buf Buffer containing the protocol packet. Must not be NULL.
ac913e5c	317	* @param floatval Pointer to a float variable. That variable will be modified
1fbab466	318	* in-place depending on the protocol packet. Must not be NULL.
ac913e5c UH	319	* @param analog Pointer to a struct sr_datafeed_analog. The struct will be
ac913e5c UH	320	* filled with data according to the protocol packet.
1fbab466 UH	321	* Must not be NULL.
	322	* @param info Pointer to a struct metex14_info. The struct will be filled
	323	* with data according to the protocol packet. Must not be NULL.
ac913e5c UH	324	*
	325	* @return SR_OK upon success, SR_ERR upon failure. Upon errors, the
	326	* 'analog' variable contents are undefined and should not be used.
	327	*/
	328	SR_PRIV int sr_metex14_parse(const uint8_t buf, float floatval,
1fbab466	329	struct sr_datafeed_analog analog, void info)
ac913e5c UH	330	{
ac913e5c UH	331	int ret;
1fbab466 UH	332	struct metex14_info *info_local;
	333
	334	info_local = (struct metex14_info *)info;
ac913e5c	335
e82d7dbc AG	336	/* Don't print byte 13. That one contains the carriage return. */
	337	sr_dbg("DMM packet: \"%.13s\"", buf);
	338
ac913e5c UH	339	if ((ret = parse_value(buf, floatval)) != SR_OK) {
	340	sr_err("Error parsing value: %d.", ret);
	341	return ret;
	342	}
	343
1fbab466 UH	344	memset(info_local, 0x00, sizeof(struct metex14_info));
	345	parse_flags((const char *)buf, info_local);
	346	handle_flags(analog, floatval, info_local);
ac913e5c UH	347
	348	return SR_OK;
	349	}