[libsigrok.git] / src / dmm / ut71x.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2014 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, see <http://www.gnu.org/licenses/>.
 */

/*
 * UNI-T UT71x protocol parser.
 *
 * Communication parameters: Unidirectional, 2400/7o1
 */

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

#define LOG_PREFIX "ut71x"

/*
 * Exponents for the respective measurement mode.
 *
 * The Conrad/Voltcraft protocol descriptions have a typo (they suggest
 * index 0 for the 10A range (which is incorrect, it's range 1).
 */
static const int exponents[16][8] = {
	{ -5,   0,   0,   0,  0,  0,  0,  0 }, /* AC mV */
	{  0,  -4,  -3,  -2, -1,  0,  0,  0 }, /* DC V */
	{  0,  -4,  -3,  -2, -1,  0,  0,  0 }, /* AC V */
	{ -5,   0,   0,   0,  0,  0,  0,  0 }, /* DC mV */
	{  0,  -1,   0,   1,  2,  3,  4,  0 }, /* Resistance */
	{  0, -12, -11, -10, -9, -8, -7, -6 }, /* Capacitance */
	{ -1,   0,   0,   0,  0,  0,  0,  0 }, /* Temp (C) */
	{ -8,  -7,   0,   0,  0,  0,  0,  0 }, /* uA */
	{ -6,  -5,   0,   0,  0,  0,  0,  0 }, /* mA */
	{  0,  -3,   0,   0,  0,  0,  0,  0 }, /* 10A */
	{ -1,   0,   0,   0,  0,  0,  0,  0 }, /* Continuity */
	{ -4,   0,   0,   0,  0,  0,  0,  0 }, /* Diode */
	{ -3,  -2,  -1,   0,  1,  2,  3,  4 }, /* Frequency */
	{ -1,   0,   0,   0,  0,  0,  0,  0 }, /* Temp (F) */
	{  0,   0,   0,   0,  0,  0,  0,  0 }, /* Power */
	{ -2,   0,   0,   0,  0,  0,  0,  0 }, /* Loop current */
};

static int parse_value(const uint8_t *buf, struct ut71x_info *info, float *result)
{
	int i, intval, num_digits = 5;

	/* Bytes 0-4: Value (5 decimal digits) */
	if (!strncmp((const char *)buf, "::0<:", 5)) {
		sr_spew("Over limit.");
		*result = INFINITY;
		return SR_OK;
	} else if (!strncmp((const char *)buf, ":<0::", 5)) {
		sr_spew("Under limit.");
		*result = INFINITY;
		return SR_OK;
	} else if (buf[4] == ':') {
		sr_dbg("4000 count mode, only 4 digits used.");
		num_digits = 4;
	} else if (!isdigit(buf[0]) || !isdigit(buf[1]) ||
	           !isdigit(buf[2]) || !isdigit(buf[3]) || !isdigit(buf[4])) {
		sr_dbg("Invalid digits: %02x %02x %02x %02x %02x (%c %c "
		       "%c %c %c).", buf[0], buf[1], buf[2], buf[3], buf[4],
		       buf[0], buf[1], buf[2], buf[3], buf[4]);
		return SR_ERR;
	}
	for (i = 0, intval = 0; i < num_digits; i++)
		intval = 10 * intval + (buf[i] - '0');

	/* Apply sign. */
	intval *= info->is_sign ? -1 : 1;

	/* Note: The decimal point position will be parsed later. */
	*result = (float)intval;
	sr_spew("The display value is %f.", *result);

	return SR_OK;
}

static int parse_range(const uint8_t *buf, float *floatval, int *exponent)
{
	int idx, mode;

	idx = buf[5] - '0';
	if (idx < 0 || idx > 7) {
		sr_dbg("Invalid range byte 0x%02x (idx 0x%02x).", buf[5], idx);
		return SR_ERR;
	}

	mode = buf[6] - '0';
	if (mode < 0 || mode > 15) {
		sr_dbg("Invalid mode byte 0x%02x (idx 0x%02x).", buf[6], mode);
		return SR_ERR;
	}

	sr_spew("mode/idx = %d/%d", mode, idx);

	*exponent = exponents[mode][idx];

	/* Apply respective exponent (mode-dependent) on the value. */
	*floatval *= powf(10, *exponent);
	sr_dbg("Applying exponent %d, new value is %f.", *exponent, *floatval);

	return SR_OK;
}

static void parse_flags(const uint8_t *buf, struct ut71x_info *info)
{
	/* Function byte */
	switch (buf[6] - '0') {
	case 0: /* AC mV */
		info->is_voltage = info->is_ac = TRUE;
		break;
	case 1: /* DC V */
		info->is_voltage = info->is_dc = TRUE;
		break;
	case 2: /* AC V */
		info->is_voltage = info->is_ac = TRUE;
		break;
	case 3: /* DC mV */
		info->is_voltage = info->is_dc = TRUE;
		break;
	case 4: /* Resistance */
		info->is_resistance = TRUE;
		break;
	case 5: /* Capacitance */
		info->is_capacitance = TRUE;
		break;
	case 6: /* Temperature (Celsius) */
		info->is_temperature = info->is_celsius = TRUE;
		break;
	case 7: /* uA */
		info->is_current = info->is_dc = TRUE;
		break;
	case 8: /* mA */
		info->is_current = info->is_dc = TRUE;
		break;
	case 9: /* 10A */
		info->is_current = info->is_dc = TRUE;
		break;
	case 10: /* Continuity */
		info->is_continuity = TRUE;
		break;
	case 11: /* Diode */
		info->is_diode = TRUE;
		break;
	case 12: /* Frequency */
		info->is_frequency = TRUE;
		break;
	case 13: /* Temperature (F) */
		info->is_temperature = info->is_fahrenheit = TRUE;
		break;
	case 14: /* Power */
		/* Note: Only available on UT71E (range 0-2500W). */
		info->is_power = TRUE;
		break;
	case 15: /* DC loop current, percentage display (range 4-20mA) */
		info->is_loop_current = TRUE;
		break;
	default:
		sr_dbg("Invalid function byte: 0x%02x.", buf[6]);
		break;
	}

	/*
	 * State 1 byte: bit 0 = AC, bit 1 = DC
	 * Either AC or DC or both or none can be set at the same time.
	 */
	info->is_ac = (buf[7] & (1 << 0)) != 0;
	info->is_dc = (buf[7] & (1 << 1)) != 0;

	/*
	 * State 2 byte: bit 0 = auto, bit 1 = manual, bit 2 = sign
	 *
	 * The Conrad/Voltcraft protocol descriptions have a typo
	 * (they suggest bit 3 as sign bit, which is incorrect).
	 *
	 * For modes where there's only one possible range (e.g. AC mV)
	 * neither the "auto" nor the "manual" bits will be set.
	 */
	info->is_auto   = (buf[8] & (1 << 0)) != 0;
	info->is_manual = (buf[8] & (1 << 1)) != 0;
	info->is_sign   = (buf[8] & (1 << 2)) != 0;

	/* Note: "Frequency mode + sign bit" means "duty cycle mode". */
	if (info->is_frequency && info->is_sign) {
		info->is_duty_cycle = TRUE;
		info->is_frequency = info->is_sign = FALSE;
	}
}

static void handle_flags(struct sr_datafeed_analog *analog,
		float *floatval, const struct ut71x_info *info)
{
	/* Measurement modes */
	if (info->is_voltage) {
		analog->meaning->mq = SR_MQ_VOLTAGE;
		analog->meaning->unit = SR_UNIT_VOLT;
	}
	if (info->is_current) {
		analog->meaning->mq = SR_MQ_CURRENT;
		analog->meaning->unit = SR_UNIT_AMPERE;
	}
	if (info->is_resistance) {
		analog->meaning->mq = SR_MQ_RESISTANCE;
		analog->meaning->unit = SR_UNIT_OHM;
	}
	if (info->is_frequency) {
		analog->meaning->mq = SR_MQ_FREQUENCY;
		analog->meaning->unit = SR_UNIT_HERTZ;
	}
	if (info->is_capacitance) {
		analog->meaning->mq = SR_MQ_CAPACITANCE;
		analog->meaning->unit = SR_UNIT_FARAD;
	}
	if (info->is_temperature && info->is_celsius) {
		analog->meaning->mq = SR_MQ_TEMPERATURE;
		analog->meaning->unit = SR_UNIT_CELSIUS;
	}
	if (info->is_temperature && info->is_fahrenheit) {
		analog->meaning->mq = SR_MQ_TEMPERATURE;
		analog->meaning->unit = SR_UNIT_FAHRENHEIT;
	}
	if (info->is_continuity) {
		analog->meaning->mq = SR_MQ_CONTINUITY;
		analog->meaning->unit = SR_UNIT_BOOLEAN;
		*floatval = (*floatval < 0.0 || *floatval > 60.0) ? 0.0 : 1.0;
	}
	if (info->is_diode) {
		analog->meaning->mq = SR_MQ_VOLTAGE;
		analog->meaning->unit = SR_UNIT_VOLT;
	}
	if (info->is_duty_cycle) {
		analog->meaning->mq = SR_MQ_DUTY_CYCLE;
		analog->meaning->unit = SR_UNIT_PERCENTAGE;
	}
	if (info->is_power) {
		analog->meaning->mq = SR_MQ_POWER;
		analog->meaning->unit = SR_UNIT_WATT;
	}
	if (info->is_loop_current) {
		/* 4mA = 0%, 20mA = 100% */
		analog->meaning->mq = SR_MQ_CURRENT;
		analog->meaning->unit = SR_UNIT_PERCENTAGE;
	}

	/* Measurement related flags */
	if (info->is_ac)
		analog->meaning->mqflags |= SR_MQFLAG_AC;
	if (info->is_dc)
		analog->meaning->mqflags |= SR_MQFLAG_DC;
	if (info->is_ac)
		/* All AC modes do True-RMS measurements. */
		analog->meaning->mqflags |= SR_MQFLAG_RMS;
	if (info->is_auto)
		analog->meaning->mqflags |= SR_MQFLAG_AUTORANGE;
	if (info->is_diode)
		analog->meaning->mqflags |= SR_MQFLAG_DIODE;
}

static gboolean flags_valid(const struct ut71x_info *info)
{
	int count;

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

	/* Auto and manual can't be active at the same time. */
	if (info->is_auto && info->is_manual) {
		sr_dbg("Auto and manual modes are both active.");
		return FALSE;
	}

	return TRUE;
}

SR_PRIV gboolean sr_ut71x_packet_valid(const uint8_t *buf)
{
	struct ut71x_info info;

	memset(&info, 0, sizeof(struct ut71x_info));

	if (buf[9] != '\r' || buf[10] != '\n')
		return FALSE;

	parse_flags(buf, &info);

	return flags_valid(&info);
}

SR_PRIV int sr_ut71x_parse(const uint8_t *buf, float *floatval,
		struct sr_datafeed_analog *analog, void *info)
{
	int ret, exponent = 0;
	struct ut71x_info *info_local;

	info_local = (struct ut71x_info *)info;
	memset(info_local, 0, sizeof(struct ut71x_info));

	if (!sr_ut71x_packet_valid(buf))
		return SR_ERR;

	parse_flags(buf, info_local);

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

	if ((ret = parse_range(buf, floatval, &exponent)) != SR_OK)
		return ret;

	handle_flags(analog, floatval, info);

	analog->encoding->digits = -exponent;
	analog->spec->spec_digits = -exponent;

	return SR_OK;
}
Commit	Line	Data
626027df UH	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2014 Uwe Hermann <uwe@hermann-uwe.de>
	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
2ea1fdf1	17	* along with this program; if not, see <http://www.gnu.org/licenses/>.
626027df UH	18	*/
	19
	20	/*
	21	* UNI-T UT71x protocol parser.
	22	*
	23	* Communication parameters: Unidirectional, 2400/7o1
	24	*/
	25
6ec6c43b	26	#include <config.h>
626027df UH	27	#include <string.h>
	28	#include <ctype.h>
	29	#include <math.h>
	30	#include <glib.h>
c1aae900	31	#include <libsigrok/libsigrok.h>
626027df UH	32	#include "libsigrok-internal.h"
	33
	34	#define LOG_PREFIX "ut71x"
	35
	36	/*
4f414d4c	37	* Exponents for the respective measurement mode.
626027df UH	38	*
	39	* The Conrad/Voltcraft protocol descriptions have a typo (they suggest
	40	* index 0 for the 10A range (which is incorrect, it's range 1).
	41	*/
4f414d4c AJ	42	static const int exponents[16][8] = {
	43	{ -5, 0, 0, 0, 0, 0, 0, 0 }, /* AC mV */
	44	{ 0, -4, -3, -2, -1, 0, 0, 0 }, /* DC V */
	45	{ 0, -4, -3, -2, -1, 0, 0, 0 }, /* AC V */
	46	{ -5, 0, 0, 0, 0, 0, 0, 0 }, /* DC mV */
	47	{ 0, -1, 0, 1, 2, 3, 4, 0 }, /* Resistance */
	48	{ 0, -12, -11, -10, -9, -8, -7, -6 }, /* Capacitance */
	49	{ -1, 0, 0, 0, 0, 0, 0, 0 }, /* Temp (C) */
	50	{ -8, -7, 0, 0, 0, 0, 0, 0 }, /* uA */
	51	{ -6, -5, 0, 0, 0, 0, 0, 0 }, /* mA */
	52	{ 0, -3, 0, 0, 0, 0, 0, 0 }, /* 10A */
	53	{ -1, 0, 0, 0, 0, 0, 0, 0 }, /* Continuity */
	54	{ -4, 0, 0, 0, 0, 0, 0, 0 }, /* Diode */
	55	{ -3, -2, -1, 0, 1, 2, 3, 4 }, /* Frequency */
	56	{ -1, 0, 0, 0, 0, 0, 0, 0 }, /* Temp (F) */
	57	{ 0, 0, 0, 0, 0, 0, 0, 0 }, /* Power */
	58	{ -2, 0, 0, 0, 0, 0, 0, 0 }, /* Loop current */
626027df UH	59	};
	60
	61	static int parse_value(const uint8_t buf, struct ut71x_info info, float *result)
	62	{
	63	int i, intval, num_digits = 5;
	64
	65	/* Bytes 0-4: Value (5 decimal digits) */
	66	if (!strncmp((const char *)buf, "::0<:", 5)) {
	67	sr_spew("Over limit.");
	68	*result = INFINITY;
	69	return SR_OK;
	70	} else if (!strncmp((const char *)buf, ":<0::", 5)) {
	71	sr_spew("Under limit.");
	72	*result = INFINITY;
	73	return SR_OK;
	74	} else if (buf[4] == ':') {
	75	sr_dbg("4000 count mode, only 4 digits used.");
	76	num_digits = 4;
	77	} else if (!isdigit(buf[0]) \|\| !isdigit(buf[1]) \|\|
	78	!isdigit(buf[2]) \|\| !isdigit(buf[3]) \|\| !isdigit(buf[4])) {
	79	sr_dbg("Invalid digits: %02x %02x %02x %02x %02x (%c %c "
	80	"%c %c %c).", buf[0], buf[1], buf[2], buf[3], buf[4],
	81	buf[0], buf[1], buf[2], buf[3], buf[4]);
	82	return SR_ERR;
	83	}
	84	for (i = 0, intval = 0; i < num_digits; i++)
	85	intval = 10 * intval + (buf[i] - '0');
	86
	87	/* Apply sign. */
	88	intval *= info->is_sign ? -1 : 1;
	89
	90	/* Note: The decimal point position will be parsed later. */
	91	*result = (float)intval;
	92	sr_spew("The display value is %f.", *result);
	93
	94	return SR_OK;
	95	}
	96
4f414d4c	97	static int parse_range(const uint8_t buf, float floatval, int *exponent)
626027df UH	98	{
626027df UH	99	int idx, mode;
626027df UH	100
	101	idx = buf[5] - '0';
	102	if (idx < 0 \|\| idx > 7) {
	103	sr_dbg("Invalid range byte 0x%02x (idx 0x%02x).", buf[5], idx);
	104	return SR_ERR;
	105	}
	106
	107	mode = buf[6] - '0';
	108	if (mode < 0 \|\| mode > 15) {
	109	sr_dbg("Invalid mode byte 0x%02x (idx 0x%02x).", buf[6], mode);
	110	return SR_ERR;
	111	}
	112
	113	sr_spew("mode/idx = %d/%d", mode, idx);
	114
4f414d4c	115	*exponent = exponents[mode][idx];
626027df	116
4f414d4c AJ	117	/* Apply respective exponent (mode-dependent) on the value. */
	118	floatval = powf(10, *exponent);
	119	sr_dbg("Applying exponent %d, new value is %f.", exponent, floatval);
626027df UH	120
	121	return SR_OK;
	122	}
	123
	124	static void parse_flags(const uint8_t buf, struct ut71x_info info)
	125	{
	126	/* Function byte */
	127	switch (buf[6] - '0') {
	128	case 0: /* AC mV */
	129	info->is_voltage = info->is_ac = TRUE;
	130	break;
	131	case 1: /* DC V */
	132	info->is_voltage = info->is_dc = TRUE;
	133	break;
	134	case 2: /* AC V */
	135	info->is_voltage = info->is_ac = TRUE;
	136	break;
	137	case 3: /* DC mV */
	138	info->is_voltage = info->is_dc = TRUE;
	139	break;
	140	case 4: /* Resistance */
	141	info->is_resistance = TRUE;
	142	break;
	143	case 5: /* Capacitance */
	144	info->is_capacitance = TRUE;
	145	break;
	146	case 6: /* Temperature (Celsius) */
	147	info->is_temperature = info->is_celsius = TRUE;
	148	break;
	149	case 7: /* uA */
	150	info->is_current = info->is_dc = TRUE;
	151	break;
	152	case 8: /* mA */
	153	info->is_current = info->is_dc = TRUE;
	154	break;
	155	case 9: /* 10A */
	156	info->is_current = info->is_dc = TRUE;
	157	break;
	158	case 10: /* Continuity */
	159	info->is_continuity = TRUE;
	160	break;
	161	case 11: /* Diode */
	162	info->is_diode = TRUE;
	163	break;
	164	case 12: /* Frequency */
	165	info->is_frequency = TRUE;
	166	break;
	167	case 13: /* Temperature (F) */
	168	info->is_temperature = info->is_fahrenheit = TRUE;
	169	break;
	170	case 14: /* Power */
	171	/* Note: Only available on UT71E (range 0-2500W). */
	172	info->is_power = TRUE;
	173	break;
	174	case 15: /* DC loop current, percentage display (range 4-20mA) */
	175	info->is_loop_current = TRUE;
	176	break;
	177	default:
	178	sr_dbg("Invalid function byte: 0x%02x.", buf[6]);
	179	break;
	180	}
	181
	182	/*
	183	* State 1 byte: bit 0 = AC, bit 1 = DC
184	* Either AC or DC or both or none can be set at the same time.
185	*/
186	info->is_ac = (buf[7] & (1 << 0)) != 0;
187	info->is_dc = (buf[7] & (1 << 1)) != 0;
188
189	/*
190	* State 2 byte: bit 0 = auto, bit 1 = manual, bit 2 = sign
191	*
192	* The Conrad/Voltcraft protocol descriptions have a typo
193	* (they suggest bit 3 as sign bit, which is incorrect).
194	*
195	* For modes where there's only one possible range (e.g. AC mV)
196	* neither the "auto" nor the "manual" bits will be set.
197	*/
198	info->is_auto = (buf[8] & (1 << 0)) != 0;
199	info->is_manual = (buf[8] & (1 << 1)) != 0;
200	info->is_sign = (buf[8] & (1 << 2)) != 0;
201
202	/* Note: "Frequency mode + sign bit" means "duty cycle mode". */
203	if (info->is_frequency && info->is_sign) {
204	info->is_duty_cycle = TRUE;
205	info->is_frequency = info->is_sign = FALSE;
206	}
207	}
208
b02bb45f	209	static void handle_flags(struct sr_datafeed_analog *analog,
626027df UH	210	float floatval, const struct ut71x_info info)
	211	{
	212	/* Measurement modes */
	213	if (info->is_voltage) {
b02bb45f UH	214	analog->meaning->mq = SR_MQ_VOLTAGE;
b02bb45f UH	215	analog->meaning->unit = SR_UNIT_VOLT;
626027df UH	216	}
626027df UH	217	if (info->is_current) {
b02bb45f UH	218	analog->meaning->mq = SR_MQ_CURRENT;
b02bb45f UH	219	analog->meaning->unit = SR_UNIT_AMPERE;
626027df UH	220	}
626027df UH	221	if (info->is_resistance) {
b02bb45f UH	222	analog->meaning->mq = SR_MQ_RESISTANCE;
b02bb45f UH	223	analog->meaning->unit = SR_UNIT_OHM;
626027df UH	224	}
626027df UH	225	if (info->is_frequency) {
b02bb45f UH	226	analog->meaning->mq = SR_MQ_FREQUENCY;
b02bb45f UH	227	analog->meaning->unit = SR_UNIT_HERTZ;
626027df UH	228	}
626027df UH	229	if (info->is_capacitance) {
b02bb45f UH	230	analog->meaning->mq = SR_MQ_CAPACITANCE;
b02bb45f UH	231	analog->meaning->unit = SR_UNIT_FARAD;
626027df UH	232	}
626027df UH	233	if (info->is_temperature && info->is_celsius) {
b02bb45f UH	234	analog->meaning->mq = SR_MQ_TEMPERATURE;
b02bb45f UH	235	analog->meaning->unit = SR_UNIT_CELSIUS;
626027df UH	236	}
626027df UH	237	if (info->is_temperature && info->is_fahrenheit) {
b02bb45f UH	238	analog->meaning->mq = SR_MQ_TEMPERATURE;
b02bb45f UH	239	analog->meaning->unit = SR_UNIT_FAHRENHEIT;
626027df UH	240	}
626027df UH	241	if (info->is_continuity) {
b02bb45f UH	242	analog->meaning->mq = SR_MQ_CONTINUITY;
b02bb45f UH	243	analog->meaning->unit = SR_UNIT_BOOLEAN;
626027df UH	244	floatval = (floatval < 0.0 \|\| *floatval > 60.0) ? 0.0 : 1.0;
	245	}
	246	if (info->is_diode) {
b02bb45f UH	247	analog->meaning->mq = SR_MQ_VOLTAGE;
b02bb45f UH	248	analog->meaning->unit = SR_UNIT_VOLT;
626027df UH	249	}
626027df UH	250	if (info->is_duty_cycle) {
b02bb45f UH	251	analog->meaning->mq = SR_MQ_DUTY_CYCLE;
b02bb45f UH	252	analog->meaning->unit = SR_UNIT_PERCENTAGE;
626027df UH	253	}
626027df UH	254	if (info->is_power) {
b02bb45f UH	255	analog->meaning->mq = SR_MQ_POWER;
b02bb45f UH	256	analog->meaning->unit = SR_UNIT_WATT;
626027df UH	257	}
	258	if (info->is_loop_current) {
	259	/* 4mA = 0%, 20mA = 100% */
b02bb45f UH	260	analog->meaning->mq = SR_MQ_CURRENT;
b02bb45f UH	261	analog->meaning->unit = SR_UNIT_PERCENTAGE;
626027df UH	262	}
	263
	264	/* Measurement related flags */
	265	if (info->is_ac)
b02bb45f	266	analog->meaning->mqflags \|= SR_MQFLAG_AC;
626027df	267	if (info->is_dc)
b02bb45f	268	analog->meaning->mqflags \|= SR_MQFLAG_DC;
626027df UH	269	if (info->is_ac)
626027df UH	270	/* All AC modes do True-RMS measurements. */
b02bb45f	271	analog->meaning->mqflags \|= SR_MQFLAG_RMS;
626027df	272	if (info->is_auto)
b02bb45f	273	analog->meaning->mqflags \|= SR_MQFLAG_AUTORANGE;
626027df	274	if (info->is_diode)
b02bb45f	275	analog->meaning->mqflags \|= SR_MQFLAG_DIODE;
626027df UH	276	}
	277
	278	static gboolean flags_valid(const struct ut71x_info *info)
	279	{
	280	int count;
	281
	282	/* Does the packet "measure" more than one type of value? */
	283	count = (info->is_voltage) ? 1 : 0;
	284	count += (info->is_current) ? 1 : 0;
	285	count += (info->is_resistance) ? 1 : 0;
	286	count += (info->is_capacitance) ? 1 : 0;
	287	count += (info->is_frequency) ? 1 : 0;
	288	count += (info->is_temperature) ? 1 : 0;
	289	count += (info->is_continuity) ? 1 : 0;
	290	count += (info->is_diode) ? 1 : 0;
	291	count += (info->is_power) ? 1 : 0;
	292	count += (info->is_loop_current) ? 1 : 0;
	293	if (count > 1) {
	294	sr_dbg("More than one measurement type detected in packet.");
	295	return FALSE;
	296	}
	297
	298	/* Auto and manual can't be active at the same time. */
	299	if (info->is_auto && info->is_manual) {
	300	sr_dbg("Auto and manual modes are both active.");
	301	return FALSE;
	302	}
	303
	304	return TRUE;
	305	}
	306
	307	SR_PRIV gboolean sr_ut71x_packet_valid(const uint8_t *buf)
	308	{
	309	struct ut71x_info info;
	310
	311	memset(&info, 0, sizeof(struct ut71x_info));
	312
	313	if (buf[9] != '\r' \|\| buf[10] != '\n')
	314	return FALSE;
	315
	316	parse_flags(buf, &info);
	317
	318	return flags_valid(&info);
	319	}
	320
	321	SR_PRIV int sr_ut71x_parse(const uint8_t buf, float floatval,
b02bb45f	322	struct sr_datafeed_analog analog, void info)
626027df	323	{
4f414d4c	324	int ret, exponent = 0;
626027df UH	325	struct ut71x_info *info_local;
	326
	327	info_local = (struct ut71x_info *)info;
	328	memset(info_local, 0, sizeof(struct ut71x_info));
	329
	330	if (!sr_ut71x_packet_valid(buf))
	331	return SR_ERR;
	332
	333	parse_flags(buf, info_local);
	334
	335	if ((ret = parse_value(buf, info, floatval)) != SR_OK) {
	336	sr_dbg("Error parsing value: %d.", ret);
	337	return ret;
	338	}
	339
4f414d4c	340	if ((ret = parse_range(buf, floatval, &exponent)) != SR_OK)
626027df UH	341	return ret;
	342
	343	handle_flags(analog, floatval, info);
	344
d9251a2c	345	analog->encoding->digits = -exponent;
4f414d4c AJ	346	analog->spec->spec_digits = -exponent;
4f414d4c AJ	347
626027df UH	348	return SR_OK;
626027df UH	349	}