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.
29 #include <libsigrok/libsigrok.h>
30 #include "libsigrok-internal.h"
32 #define LOG_PREFIX "ut372"
34 static const uint8_t lookup[] = {
47 #define DECIMAL_POINT_MASK 0x80
49 #define FLAGS1_HOLD_MASK (1 << 2)
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)
57 /* Decode a pair of characters into a byte. */
58 static uint8_t decode_pair(const uint8_t *buf)
65 for (i = 0; i < 2; i++) {
71 return strtol(hex, NULL, 16);
74 SR_PRIV gboolean sr_ut372_packet_valid(const uint8_t *buf)
78 if (!(buf[25] == '\r' && buf[26] == '\n'))
81 flags2 = decode_pair(buf + 23);
83 if (!(flags2 & (FLAGS2_RPM_MASK | FLAGS2_COUNT_MASK)))
84 /* Device is in the setup menu - no valid data shown. */
90 SR_PRIV int sr_ut372_parse(const uint8_t *buf, float *floatval,
91 struct sr_datafeed_analog *analog, void *info)
93 unsigned int i, j, value;
94 uint8_t segments, flags1, flags2;
99 flags1 = decode_pair(buf + 21);
100 flags2 = decode_pair(buf + 23);
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;
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;
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);
130 if (segments & DECIMAL_POINT_MASK)
134 *floatval = (float) value * powf(10, exponent);
136 analog->encoding->digits = -exponent;
137 analog->spec->spec_digits = -exponent;