[libsigrok.git] / src / dmm / ut372.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2015 Martin Ling <martin-sigrok@earth.li>
 *
 * 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 UT372 protocol parser.
 */

#include <config.h>
#include <stdlib.h>
#include <stdint.h>
#include <math.h>
#include <libsigrok/libsigrok.h>
#include "libsigrok-internal.h"

#define LOG_PREFIX "ut372"

static const uint8_t lookup[] = {
	0x7B,
	0x60,
	0x5E,
	0x7C,
	0x65,
	0x3D,
	0x3F,
	0x70,
	0x7F,
	0x7D,
};

#define DECIMAL_POINT_MASK 0x80

#define FLAGS1_HOLD_MASK (1 << 2)

#define FLAGS2_RPM_MASK (1 << 0)
#define FLAGS2_COUNT_MASK (1 << 1)
#define FLAGS2_MAX_MASK (1 << 4)
#define FLAGS2_MIN_MASK (1 << 5)
#define FLAGS2_AVG_MASK (1 << 6)

/* Decode a pair of characters into a byte. */
static uint8_t decode_pair(const uint8_t *buf)
{
	unsigned int i;
	char hex[3];

	hex[2] = '\0';

	for (i = 0; i < 2; i++) {
		hex[i] = buf[i];
		if (hex[i] > 0x39)
			hex[i] += 7;
	}

	return strtol(hex, NULL, 16);
}

SR_PRIV gboolean sr_ut372_packet_valid(const uint8_t *buf)
{
	uint8_t flags2;

	if (!(buf[25] == '\r' && buf[26] == '\n'))
		return FALSE;

	flags2 = decode_pair(buf + 23);

	if (!(flags2 & (FLAGS2_RPM_MASK | FLAGS2_COUNT_MASK)))
		/* Device is in the setup menu - no valid data shown. */
		return FALSE;

	return TRUE;
}

SR_PRIV int sr_ut372_parse(const uint8_t *buf, float *floatval,
		struct sr_datafeed_analog *analog, void *info)
{
	unsigned int i, j, value;
	uint8_t segments, flags1, flags2;
	int exponent;

	(void) info;

	flags1 = decode_pair(buf + 21);
	flags2 = decode_pair(buf + 23);

	if (flags2 & FLAGS2_RPM_MASK) {
		analog->meaning->mq = SR_MQ_FREQUENCY;
		analog->meaning->unit = SR_UNIT_REVOLUTIONS_PER_MINUTE;
	} else if (flags2 & FLAGS2_COUNT_MASK) {
		analog->meaning->mq = SR_MQ_COUNT;
		analog->meaning->unit = SR_UNIT_UNITLESS;
	}

	if (flags1 & FLAGS1_HOLD_MASK)
		analog->meaning->mqflags |= SR_MQFLAG_HOLD;
	if (flags2 & FLAGS2_MIN_MASK)
		analog->meaning->mqflags |= SR_MQFLAG_MIN;
	if (flags2 & FLAGS2_MAX_MASK)
		analog->meaning->mqflags |= SR_MQFLAG_MAX;
	if (flags2 & FLAGS2_AVG_MASK)
		analog->meaning->mqflags |= SR_MQFLAG_AVG;

	value = 0;
	exponent = 0;

	for (i = 0; i < 5; i++) {
		segments = decode_pair(buf + 1 + (2 * i));
		for (j = 0; j < ARRAY_SIZE(lookup); j++) {
			if (lookup[j] == (segments & ~DECIMAL_POINT_MASK)) {
				value += j * pow(10, i);
				break;
			}
		}
		if (segments & DECIMAL_POINT_MASK)
			exponent = -i;
	}

	*floatval = (float) value * powf(10, exponent);

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

	return SR_OK;
}
Commit	Line	Data
f3cde309 ML	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2015 Martin Ling <martin-sigrok@earth.li>
	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/>.
f3cde309 ML	18	*/
	19
	20	/*
	21	* UNI-T UT372 protocol parser.
	22	*/
	23
6ec6c43b	24	#include <config.h>
472bef39	25	#include <stdlib.h>
118268a2	26	#include <stdint.h>
472bef39	27	#include <math.h>
c1aae900	28	#include <libsigrok/libsigrok.h>
f3cde309 ML	29	#include "libsigrok-internal.h"
	30
	31	#define LOG_PREFIX "ut372"
	32
6df8e239	33	static const uint8_t lookup[] = {
472bef39 ML	34	0x7B,
	35	0x60,
	36	0x5E,
	37	0x7C,
	38	0x65,
	39	0x3D,
	40	0x3F,
	41	0x70,
	42	0x7F,
6df8e239	43	0x7D,
472bef39 ML	44	};
	45
	46	#define DECIMAL_POINT_MASK 0x80
	47
8c9092b0 ML	48	#define FLAGS1_HOLD_MASK (1 << 2)
	49
	50	#define FLAGS2_RPM_MASK (1 << 0)
12318aab	51	#define FLAGS2_COUNT_MASK (1 << 1)
8c9092b0 ML	52	#define FLAGS2_MAX_MASK (1 << 4)
8c9092b0 ML	53	#define FLAGS2_MIN_MASK (1 << 5)
6df8e239	54	#define FLAGS2_AVG_MASK (1 << 6)
8c9092b0	55
118268a2 ML	56	/* Decode a pair of characters into a byte. */
	57	static uint8_t decode_pair(const uint8_t *buf)
	58	{
	59	unsigned int i;
	60	char hex[3];
	61
	62	hex[2] = '\0';
	63
	64	for (i = 0; i < 2; i++) {
	65	hex[i] = buf[i];
	66	if (hex[i] > 0x39)
	67	hex[i] += 7;
	68	}
	69
	70	return strtol(hex, NULL, 16);
	71	}
	72
f3cde309 ML	73	SR_PRIV gboolean sr_ut372_packet_valid(const uint8_t *buf)
f3cde309 ML	74	{
12318aab ML	75	uint8_t flags2;
	76
	77	if (!(buf[25] == '\r' && buf[26] == '\n'))
	78	return FALSE;
	79
	80	flags2 = decode_pair(buf + 23);
	81
	82	if (!(flags2 & (FLAGS2_RPM_MASK \| FLAGS2_COUNT_MASK)))
	83	/* Device is in the setup menu - no valid data shown. */
	84	return FALSE;
	85
	86	return TRUE;
f3cde309 ML	87	}
	88
	89	SR_PRIV int sr_ut372_parse(const uint8_t buf, float floatval,
b02bb45f	90	struct sr_datafeed_analog analog, void info)
f3cde309	91	{
47166326	92	unsigned int i, j, value;
8c9092b0	93	uint8_t segments, flags1, flags2;
47166326	94	int exponent;
472bef39 ML	95
	96	(void) info;
	97
8c9092b0 ML	98	flags1 = decode_pair(buf + 21);
	99	flags2 = decode_pair(buf + 23);
	100
12318aab	101	if (flags2 & FLAGS2_RPM_MASK) {
b02bb45f UH	102	analog->meaning->mq = SR_MQ_FREQUENCY;
b02bb45f UH	103	analog->meaning->unit = SR_UNIT_REVOLUTIONS_PER_MINUTE;
12318aab	104	} else if (flags2 & FLAGS2_COUNT_MASK) {
b02bb45f UH	105	analog->meaning->mq = SR_MQ_COUNT;
b02bb45f UH	106	analog->meaning->unit = SR_UNIT_UNITLESS;
8c9092b0 ML	107	}
	108
	109	if (flags1 & FLAGS1_HOLD_MASK)
b02bb45f	110	analog->meaning->mqflags \|= SR_MQFLAG_HOLD;
8c9092b0	111	if (flags2 & FLAGS2_MIN_MASK)
b02bb45f	112	analog->meaning->mqflags \|= SR_MQFLAG_MIN;
8c9092b0	113	if (flags2 & FLAGS2_MAX_MASK)
b02bb45f	114	analog->meaning->mqflags \|= SR_MQFLAG_MAX;
6df8e239	115	if (flags2 & FLAGS2_AVG_MASK)
b02bb45f	116	analog->meaning->mqflags \|= SR_MQFLAG_AVG;
8c9092b0	117
472bef39	118	value = 0;
47166326	119	exponent = 0;
472bef39 ML	120
472bef39 ML	121	for (i = 0; i < 5; i++) {
07ffa5b3	122	segments = decode_pair(buf + 1 + (2 * i));
472bef39 ML	123	for (j = 0; j < ARRAY_SIZE(lookup); j++) {
	124	if (lookup[j] == (segments & ~DECIMAL_POINT_MASK)) {
	125	value += j * pow(10, i);
	126	break;
	127	}
	128	}
	129	if (segments & DECIMAL_POINT_MASK)
47166326	130	exponent = -i;
472bef39 ML	131	}
472bef39 ML	132
47166326 AJ	133	floatval = (float) value powf(10, exponent);
47166326 AJ	134
405b9c10	135	analog->encoding->digits = -exponent;
47166326	136	analog->spec->spec_digits = -exponent;
472bef39	137
f3cde309 ML	138	return SR_OK;
f3cde309 ML	139	}