2 * This file is part of the libsigrok project.
4 * Copyright (C) 2015 Martin Ling <martin-sigrok@earth.li>
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.
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.
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
22 * UNI-T UT372 protocol parser.
27 #include "libsigrok.h"
28 #include "libsigrok-internal.h"
30 #define LOG_PREFIX "ut372"
45 #define DECIMAL_POINT_MASK 0x80
47 SR_PRIV gboolean sr_ut372_packet_valid(const uint8_t *buf)
49 return (buf[25] == '\r' && buf[26] == '\n');
52 SR_PRIV int sr_ut372_parse(const uint8_t *buf, float *floatval,
53 struct sr_datafeed_analog *analog, void *info)
55 unsigned int i, j, segments, value, divisor;
64 for (i = 0; i < 5; i++) {
65 for (j = 0; j < 2; j++) {
66 hex[j] = buf[2*i + 1 + j];
70 segments = strtol(hex, NULL, 16);
71 for (j = 0; j < ARRAY_SIZE(lookup); j++) {
72 if (lookup[j] == (segments & ~DECIMAL_POINT_MASK)) {
73 value += j * pow(10, i);
77 if (segments & DECIMAL_POINT_MASK)
81 *floatval = (float) value / divisor;
83 analog->mq = SR_MQ_FREQUENCY;
84 analog->unit = SR_UNIT_REVOLUTIONS_PER_MINUTE;