[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 <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
	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
	25	#include <config.h>
	26	#include <stdlib.h>
	27	#include <stdint.h>
	28	#include <math.h>
	29	#include <libsigrok/libsigrok.h>
	30	#include "libsigrok-internal.h"
	31
	32	#define LOG_PREFIX "ut372"
	33
	34	static const uint8_t lookup[] = {
	35	0x7B,
	36	0x60,
	37	0x5E,
	38	0x7C,
	39	0x65,
	40	0x3D,
	41	0x3F,
	42	0x70,
	43	0x7F,
	44	0x7D,
	45	};
	46
	47	#define DECIMAL_POINT_MASK 0x80
	48
	49	#define FLAGS1_HOLD_MASK (1 << 2)
	50
	51	#define FLAGS2_RPM_MASK (1 << 0)
	52	#define FLAGS2_COUNT_MASK (1 << 1)
	53	#define FLAGS2_MAX_MASK (1 << 4)
	54	#define FLAGS2_MIN_MASK (1 << 5)
	55	#define FLAGS2_AVG_MASK (1 << 6)
	56
	57	/* Decode a pair of characters into a byte. */
	58	static uint8_t decode_pair(const uint8_t *buf)
	59	{
	60	unsigned int i;
	61	char hex[3];
	62
	63	hex[2] = '\0';
	64
	65	for (i = 0; i < 2; i++) {
	66	hex[i] = buf[i];
	67	if (hex[i] > 0x39)
	68	hex[i] += 7;
	69	}
	70
	71	return strtol(hex, NULL, 16);
	72	}
	73
	74	SR_PRIV gboolean sr_ut372_packet_valid(const uint8_t *buf)
	75	{
	76	uint8_t flags2;
	77
	78	if (!(buf[25] == '\r' && buf[26] == '\n'))
	79	return FALSE;
	80
	81	flags2 = decode_pair(buf + 23);
	82
	83	if (!(flags2 & (FLAGS2_RPM_MASK \| FLAGS2_COUNT_MASK)))
	84	/* Device is in the setup menu - no valid data shown. */
	85	return FALSE;
	86
	87	return TRUE;
	88	}
	89
	90	SR_PRIV int sr_ut372_parse(const uint8_t buf, float floatval,
	91	struct sr_datafeed_analog analog, void info)
	92	{
	93	unsigned int i, j, value;
	94	uint8_t segments, flags1, flags2;
	95	int exponent;
	96
	97	(void) info;
	98
	99	flags1 = decode_pair(buf + 21);
	100	flags2 = decode_pair(buf + 23);
	101
	102	if (flags2 & FLAGS2_RPM_MASK) {
	103	analog->meaning->mq = SR_MQ_FREQUENCY;
	104	analog->meaning->unit = SR_UNIT_REVOLUTIONS_PER_MINUTE;
	105	} else if (flags2 & FLAGS2_COUNT_MASK) {
	106	analog->meaning->mq = SR_MQ_COUNT;
	107	analog->meaning->unit = SR_UNIT_UNITLESS;
	108	}
	109
	110	if (flags1 & FLAGS1_HOLD_MASK)
	111	analog->meaning->mqflags \|= SR_MQFLAG_HOLD;
	112	if (flags2 & FLAGS2_MIN_MASK)
	113	analog->meaning->mqflags \|= SR_MQFLAG_MIN;
	114	if (flags2 & FLAGS2_MAX_MASK)
	115	analog->meaning->mqflags \|= SR_MQFLAG_MAX;
	116	if (flags2 & FLAGS2_AVG_MASK)
	117	analog->meaning->mqflags \|= SR_MQFLAG_AVG;
	118
	119	value = 0;
	120	exponent = 0;
	121
	122	for (i = 0; i < 5; i++) {
	123	segments = decode_pair(buf + 1 + (2 * i));
	124	for (j = 0; j < ARRAY_SIZE(lookup); j++) {
	125	if (lookup[j] == (segments & ~DECIMAL_POINT_MASK)) {
	126	value += j * pow(10, i);
	127	break;
	128	}
	129	}
	130	if (segments & DECIMAL_POINT_MASK)
	131	exponent = -i;
	132	}
	133
	134	floatval = (float) value powf(10, exponent);
	135
	136	analog->encoding->digits = -exponent;
	137	analog->spec->spec_digits = -exponent;
	138
	139	return SR_OK;
	140	}