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

/*
 * UNI-T UT372 protocol parser.
 */

#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, divisor;
	uint8_t segments, flags1, flags2;

	(void) info;

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

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

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

	value = 0;
	divisor = 1;

	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)
			divisor = pow(10, i);
	}

	*floatval = (float) value / divisor;

	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
	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 UT372 protocol parser.
	23	*/
	24
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,
	90	struct sr_datafeed_analog analog, void info)
	91	{
118268a2	92	unsigned int i, j, value, divisor;
8c9092b0	93	uint8_t segments, flags1, flags2;
472bef39 ML	94
	95	(void) info;
	96
8c9092b0 ML	97	flags1 = decode_pair(buf + 21);
	98	flags2 = decode_pair(buf + 23);
	99
12318aab ML	100	if (flags2 & FLAGS2_RPM_MASK) {
	101	analog->mq = SR_MQ_FREQUENCY;
	102	analog->unit = SR_UNIT_REVOLUTIONS_PER_MINUTE;
	103	} else if (flags2 & FLAGS2_COUNT_MASK) {
	104	analog->mq = SR_MQ_COUNT;
	105	analog->unit = SR_UNIT_UNITLESS;
8c9092b0 ML	106	}
	107
	108	if (flags1 & FLAGS1_HOLD_MASK)
	109	analog->mqflags \|= SR_MQFLAG_HOLD;
	110	if (flags2 & FLAGS2_MIN_MASK)
	111	analog->mqflags \|= SR_MQFLAG_MIN;
	112	if (flags2 & FLAGS2_MAX_MASK)
	113	analog->mqflags \|= SR_MQFLAG_MAX;
6df8e239	114	if (flags2 & FLAGS2_AVG_MASK)
8c9092b0 ML	115	analog->mqflags \|= SR_MQFLAG_AVG;
8c9092b0 ML	116
472bef39 ML	117	value = 0;
	118	divisor = 1;
	119
	120	for (i = 0; i < 5; i++) {
07ffa5b3	121	segments = decode_pair(buf + 1 + (2 * i));
472bef39 ML	122	for (j = 0; j < ARRAY_SIZE(lookup); j++) {
	123	if (lookup[j] == (segments & ~DECIMAL_POINT_MASK)) {
	124	value += j * pow(10, i);
	125	break;
	126	}
	127	}
	128	if (segments & DECIMAL_POINT_MASK)
	129	divisor = pow(10, i);
	130	}
	131
	132	*floatval = (float) value / divisor;
	133
f3cde309 ML	134	return SR_OK;
f3cde309 ML	135	}