[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, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

/*
 * 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
	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	* UNI-T UT71x protocol parser.
	23	*
	24	* Communication parameters: Unidirectional, 2400/7o1
	25	*/
	26
6ec6c43b	27	#include <config.h>
626027df UH	28	#include <string.h>
	29	#include <ctype.h>
	30	#include <math.h>
	31	#include <glib.h>
c1aae900	32	#include <libsigrok/libsigrok.h>
626027df UH	33	#include "libsigrok-internal.h"
	34
	35	#define LOG_PREFIX "ut71x"
	36
	37	/*
4f414d4c	38	* Exponents for the respective measurement mode.
626027df UH	39	*
	40	* The Conrad/Voltcraft protocol descriptions have a typo (they suggest
	41	* index 0 for the 10A range (which is incorrect, it's range 1).
	42	*/
4f414d4c AJ	43	static const int exponents[16][8] = {
	44	{ -5, 0, 0, 0, 0, 0, 0, 0 }, /* AC mV */
	45	{ 0, -4, -3, -2, -1, 0, 0, 0 }, /* DC V */
	46	{ 0, -4, -3, -2, -1, 0, 0, 0 }, /* AC V */
	47	{ -5, 0, 0, 0, 0, 0, 0, 0 }, /* DC mV */
	48	{ 0, -1, 0, 1, 2, 3, 4, 0 }, /* Resistance */
	49	{ 0, -12, -11, -10, -9, -8, -7, -6 }, /* Capacitance */
	50	{ -1, 0, 0, 0, 0, 0, 0, 0 }, /* Temp (C) */
	51	{ -8, -7, 0, 0, 0, 0, 0, 0 }, /* uA */
	52	{ -6, -5, 0, 0, 0, 0, 0, 0 }, /* mA */
	53	{ 0, -3, 0, 0, 0, 0, 0, 0 }, /* 10A */
	54	{ -1, 0, 0, 0, 0, 0, 0, 0 }, /* Continuity */
	55	{ -4, 0, 0, 0, 0, 0, 0, 0 }, /* Diode */
	56	{ -3, -2, -1, 0, 1, 2, 3, 4 }, /* Frequency */
	57	{ -1, 0, 0, 0, 0, 0, 0, 0 }, /* Temp (F) */
	58	{ 0, 0, 0, 0, 0, 0, 0, 0 }, /* Power */
	59	{ -2, 0, 0, 0, 0, 0, 0, 0 }, /* Loop current */
626027df UH	60	};
	61
	62	static int parse_value(const uint8_t buf, struct ut71x_info info, float *result)
	63	{
	64	int i, intval, num_digits = 5;
	65
	66	/* Bytes 0-4: Value (5 decimal digits) */
	67	if (!strncmp((const char *)buf, "::0<:", 5)) {
	68	sr_spew("Over limit.");
	69	*result = INFINITY;
	70	return SR_OK;
	71	} else if (!strncmp((const char *)buf, ":<0::", 5)) {
	72	sr_spew("Under limit.");
	73	*result = INFINITY;
	74	return SR_OK;
	75	} else if (buf[4] == ':') {
	76	sr_dbg("4000 count mode, only 4 digits used.");
	77	num_digits = 4;
	78	} else if (!isdigit(buf[0]) \|\| !isdigit(buf[1]) \|\|
	79	!isdigit(buf[2]) \|\| !isdigit(buf[3]) \|\| !isdigit(buf[4])) {
	80	sr_dbg("Invalid digits: %02x %02x %02x %02x %02x (%c %c "
	81	"%c %c %c).", buf[0], buf[1], buf[2], buf[3], buf[4],
	82	buf[0], buf[1], buf[2], buf[3], buf[4]);
	83	return SR_ERR;
	84	}
	85	for (i = 0, intval = 0; i < num_digits; i++)
	86	intval = 10 * intval + (buf[i] - '0');
	87
	88	/* Apply sign. */
	89	intval *= info->is_sign ? -1 : 1;
	90
	91	/* Note: The decimal point position will be parsed later. */
	92	*result = (float)intval;
	93	sr_spew("The display value is %f.", *result);
	94
	95	return SR_OK;
	96	}
	97
4f414d4c	98	static int parse_range(const uint8_t buf, float floatval, int *exponent)
626027df UH	99	{
626027df UH	100	int idx, mode;
626027df UH	101
	102	idx = buf[5] - '0';
	103	if (idx < 0 \|\| idx > 7) {
	104	sr_dbg("Invalid range byte 0x%02x (idx 0x%02x).", buf[5], idx);
	105	return SR_ERR;
	106	}
	107
	108	mode = buf[6] - '0';
	109	if (mode < 0 \|\| mode > 15) {
	110	sr_dbg("Invalid mode byte 0x%02x (idx 0x%02x).", buf[6], mode);
	111	return SR_ERR;
	112	}
	113
	114	sr_spew("mode/idx = %d/%d", mode, idx);
	115
4f414d4c	116	*exponent = exponents[mode][idx];
626027df	117
4f414d4c AJ	118	/* Apply respective exponent (mode-dependent) on the value. */
	119	floatval = powf(10, *exponent);
	120	sr_dbg("Applying exponent %d, new value is %f.", exponent, floatval);
626027df UH	121
	122	return SR_OK;
	123	}
	124
	125	static void parse_flags(const uint8_t buf, struct ut71x_info info)
	126	{
	127	/* Function byte */
	128	switch (buf[6] - '0') {
	129	case 0: /* AC mV */
	130	info->is_voltage = info->is_ac = TRUE;
	131	break;
	132	case 1: /* DC V */
	133	info->is_voltage = info->is_dc = TRUE;
	134	break;
	135	case 2: /* AC V */
	136	info->is_voltage = info->is_ac = TRUE;
	137	break;
	138	case 3: /* DC mV */
	139	info->is_voltage = info->is_dc = TRUE;
	140	break;
	141	case 4: /* Resistance */
	142	info->is_resistance = TRUE;
	143	break;
	144	case 5: /* Capacitance */
	145	info->is_capacitance = TRUE;
	146	break;
	147	case 6: /* Temperature (Celsius) */
	148	info->is_temperature = info->is_celsius = TRUE;
	149	break;
	150	case 7: /* uA */
	151	info->is_current = info->is_dc = TRUE;
	152	break;
	153	case 8: /* mA */
	154	info->is_current = info->is_dc = TRUE;
	155	break;
	156	case 9: /* 10A */
	157	info->is_current = info->is_dc = TRUE;
	158	break;
	159	case 10: /* Continuity */
	160	info->is_continuity = TRUE;
	161	break;
	162	case 11: /* Diode */
	163	info->is_diode = TRUE;
	164	break;
	165	case 12: /* Frequency */
	166	info->is_frequency = TRUE;
	167	break;
	168	case 13: /* Temperature (F) */
	169	info->is_temperature = info->is_fahrenheit = TRUE;
	170	break;
	171	case 14: /* Power */
	172	/* Note: Only available on UT71E (range 0-2500W). */
	173	info->is_power = TRUE;
	174	break;
	175	case 15: /* DC loop current, percentage display (range 4-20mA) */
	176	info->is_loop_current = TRUE;
	177	break;
	178	default:
	179	sr_dbg("Invalid function byte: 0x%02x.", buf[6]);
	180	break;
	181	}
	182
	183	/*
	184	* State 1 byte: bit 0 = AC, bit 1 = DC
185	* Either AC or DC or both or none can be set at the same time.
186	*/
187	info->is_ac = (buf[7] & (1 << 0)) != 0;
188	info->is_dc = (buf[7] & (1 << 1)) != 0;
189
190	/*
191	* State 2 byte: bit 0 = auto, bit 1 = manual, bit 2 = sign
192	*
193	* The Conrad/Voltcraft protocol descriptions have a typo
194	* (they suggest bit 3 as sign bit, which is incorrect).
195	*
196	* For modes where there's only one possible range (e.g. AC mV)
197	* neither the "auto" nor the "manual" bits will be set.
198	*/
199	info->is_auto = (buf[8] & (1 << 0)) != 0;
200	info->is_manual = (buf[8] & (1 << 1)) != 0;
201	info->is_sign = (buf[8] & (1 << 2)) != 0;
202
203	/* Note: "Frequency mode + sign bit" means "duty cycle mode". */
204	if (info->is_frequency && info->is_sign) {
205	info->is_duty_cycle = TRUE;
206	info->is_frequency = info->is_sign = FALSE;
207	}
208	}
209
b02bb45f	210	static void handle_flags(struct sr_datafeed_analog *analog,
626027df UH	211	float floatval, const struct ut71x_info info)
	212	{
	213	/* Measurement modes */
	214	if (info->is_voltage) {
b02bb45f UH	215	analog->meaning->mq = SR_MQ_VOLTAGE;
b02bb45f UH	216	analog->meaning->unit = SR_UNIT_VOLT;
626027df UH	217	}
626027df UH	218	if (info->is_current) {
b02bb45f UH	219	analog->meaning->mq = SR_MQ_CURRENT;
b02bb45f UH	220	analog->meaning->unit = SR_UNIT_AMPERE;
626027df UH	221	}
626027df UH	222	if (info->is_resistance) {
b02bb45f UH	223	analog->meaning->mq = SR_MQ_RESISTANCE;
b02bb45f UH	224	analog->meaning->unit = SR_UNIT_OHM;
626027df UH	225	}
626027df UH	226	if (info->is_frequency) {
b02bb45f UH	227	analog->meaning->mq = SR_MQ_FREQUENCY;
b02bb45f UH	228	analog->meaning->unit = SR_UNIT_HERTZ;
626027df UH	229	}
626027df UH	230	if (info->is_capacitance) {
b02bb45f UH	231	analog->meaning->mq = SR_MQ_CAPACITANCE;
b02bb45f UH	232	analog->meaning->unit = SR_UNIT_FARAD;
626027df UH	233	}
626027df UH	234	if (info->is_temperature && info->is_celsius) {
b02bb45f UH	235	analog->meaning->mq = SR_MQ_TEMPERATURE;
b02bb45f UH	236	analog->meaning->unit = SR_UNIT_CELSIUS;
626027df UH	237	}
626027df UH	238	if (info->is_temperature && info->is_fahrenheit) {
b02bb45f UH	239	analog->meaning->mq = SR_MQ_TEMPERATURE;
b02bb45f UH	240	analog->meaning->unit = SR_UNIT_FAHRENHEIT;
626027df UH	241	}
626027df UH	242	if (info->is_continuity) {
b02bb45f UH	243	analog->meaning->mq = SR_MQ_CONTINUITY;
b02bb45f UH	244	analog->meaning->unit = SR_UNIT_BOOLEAN;
626027df UH	245	floatval = (floatval < 0.0 \|\| *floatval > 60.0) ? 0.0 : 1.0;
	246	}
	247	if (info->is_diode) {
b02bb45f UH	248	analog->meaning->mq = SR_MQ_VOLTAGE;
b02bb45f UH	249	analog->meaning->unit = SR_UNIT_VOLT;
626027df UH	250	}
626027df UH	251	if (info->is_duty_cycle) {
b02bb45f UH	252	analog->meaning->mq = SR_MQ_DUTY_CYCLE;
b02bb45f UH	253	analog->meaning->unit = SR_UNIT_PERCENTAGE;
626027df UH	254	}
626027df UH	255	if (info->is_power) {
b02bb45f UH	256	analog->meaning->mq = SR_MQ_POWER;
b02bb45f UH	257	analog->meaning->unit = SR_UNIT_WATT;
626027df UH	258	}
	259	if (info->is_loop_current) {
	260	/* 4mA = 0%, 20mA = 100% */
b02bb45f UH	261	analog->meaning->mq = SR_MQ_CURRENT;
b02bb45f UH	262	analog->meaning->unit = SR_UNIT_PERCENTAGE;
626027df UH	263	}
	264
	265	/* Measurement related flags */
	266	if (info->is_ac)
b02bb45f	267	analog->meaning->mqflags \|= SR_MQFLAG_AC;
626027df	268	if (info->is_dc)
b02bb45f	269	analog->meaning->mqflags \|= SR_MQFLAG_DC;
626027df UH	270	if (info->is_ac)
626027df UH	271	/* All AC modes do True-RMS measurements. */
b02bb45f	272	analog->meaning->mqflags \|= SR_MQFLAG_RMS;
626027df	273	if (info->is_auto)
b02bb45f	274	analog->meaning->mqflags \|= SR_MQFLAG_AUTORANGE;
626027df	275	if (info->is_diode)
b02bb45f	276	analog->meaning->mqflags \|= SR_MQFLAG_DIODE;
626027df UH	277	}
	278
	279	static gboolean flags_valid(const struct ut71x_info *info)
	280	{
	281	int count;
	282
	283	/* Does the packet "measure" more than one type of value? */
	284	count = (info->is_voltage) ? 1 : 0;
	285	count += (info->is_current) ? 1 : 0;
	286	count += (info->is_resistance) ? 1 : 0;
	287	count += (info->is_capacitance) ? 1 : 0;
	288	count += (info->is_frequency) ? 1 : 0;
	289	count += (info->is_temperature) ? 1 : 0;
	290	count += (info->is_continuity) ? 1 : 0;
	291	count += (info->is_diode) ? 1 : 0;
	292	count += (info->is_power) ? 1 : 0;
	293	count += (info->is_loop_current) ? 1 : 0;
	294	if (count > 1) {
	295	sr_dbg("More than one measurement type detected in packet.");
	296	return FALSE;
	297	}
	298
	299	/* Auto and manual can't be active at the same time. */
	300	if (info->is_auto && info->is_manual) {
	301	sr_dbg("Auto and manual modes are both active.");
	302	return FALSE;
	303	}
	304
	305	return TRUE;
	306	}
	307
	308	SR_PRIV gboolean sr_ut71x_packet_valid(const uint8_t *buf)
	309	{
	310	struct ut71x_info info;
	311
	312	memset(&info, 0, sizeof(struct ut71x_info));
	313
	314	if (buf[9] != '\r' \|\| buf[10] != '\n')
	315	return FALSE;
	316
	317	parse_flags(buf, &info);
	318
	319	return flags_valid(&info);
	320	}
	321
	322	SR_PRIV int sr_ut71x_parse(const uint8_t buf, float floatval,
b02bb45f	323	struct sr_datafeed_analog analog, void info)
626027df	324	{
4f414d4c	325	int ret, exponent = 0;
626027df UH	326	struct ut71x_info *info_local;
	327
	328	info_local = (struct ut71x_info *)info;
	329	memset(info_local, 0, sizeof(struct ut71x_info));
	330
	331	if (!sr_ut71x_packet_valid(buf))
	332	return SR_ERR;
	333
	334	parse_flags(buf, info_local);
	335
	336	if ((ret = parse_value(buf, info, floatval)) != SR_OK) {
	337	sr_dbg("Error parsing value: %d.", ret);
	338	return ret;
	339	}
	340
4f414d4c	341	if ((ret = parse_range(buf, floatval, &exponent)) != SR_OK)
626027df UH	342	return ret;
	343
	344	handle_flags(analog, floatval, info);
	345
4f414d4c AJ	346	analog->encoding->digits = -exponent;
	347	analog->spec->spec_digits = -exponent;
	348
626027df UH	349	return SR_OK;
626027df UH	350	}