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Commit | Line | Data |
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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> |
f3cde309 ML |
28 | #include "libsigrok.h" |
29 | #include "libsigrok-internal.h" | |
30 | ||
31 | #define LOG_PREFIX "ut372" | |
32 | ||
118268a2 | 33 | uint8_t lookup[] = { |
472bef39 ML |
34 | 0x7B, |
35 | 0x60, | |
36 | 0x5E, | |
37 | 0x7C, | |
38 | 0x65, | |
39 | 0x3D, | |
40 | 0x3F, | |
41 | 0x70, | |
42 | 0x7F, | |
43 | 0x7D | |
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) | |
51 | #define FLAGS2_MAX_MASK (1 << 4) | |
52 | #define FLAGS2_MIN_MASK (1 << 5) | |
53 | #define FLAGS2_AVE_MASK (1 << 6) | |
54 | ||
118268a2 ML |
55 | /* Decode a pair of characters into a byte. */ |
56 | static uint8_t decode_pair(const uint8_t *buf) | |
57 | { | |
58 | unsigned int i; | |
59 | char hex[3]; | |
60 | ||
61 | hex[2] = '\0'; | |
62 | ||
63 | for (i = 0; i < 2; i++) { | |
64 | hex[i] = buf[i]; | |
65 | if (hex[i] > 0x39) | |
66 | hex[i] += 7; | |
67 | } | |
68 | ||
69 | return strtol(hex, NULL, 16); | |
70 | } | |
71 | ||
f3cde309 ML |
72 | SR_PRIV gboolean sr_ut372_packet_valid(const uint8_t *buf) |
73 | { | |
472bef39 | 74 | return (buf[25] == '\r' && buf[26] == '\n'); |
f3cde309 ML |
75 | } |
76 | ||
77 | SR_PRIV int sr_ut372_parse(const uint8_t *buf, float *floatval, | |
78 | struct sr_datafeed_analog *analog, void *info) | |
79 | { | |
118268a2 | 80 | unsigned int i, j, value, divisor; |
8c9092b0 | 81 | uint8_t segments, flags1, flags2; |
472bef39 ML |
82 | |
83 | (void) info; | |
84 | ||
8c9092b0 ML |
85 | flags1 = decode_pair(buf + 21); |
86 | flags2 = decode_pair(buf + 23); | |
87 | ||
88 | /* If not in RPM mode, ignore packet. */ | |
89 | if (!(flags2 & FLAGS2_RPM_MASK)) { | |
90 | sr_dbg("Not in RPM mode. Count mode is unsupported."); | |
91 | return SR_ERR_NA; | |
92 | } | |
93 | ||
94 | if (flags1 & FLAGS1_HOLD_MASK) | |
95 | analog->mqflags |= SR_MQFLAG_HOLD; | |
96 | if (flags2 & FLAGS2_MIN_MASK) | |
97 | analog->mqflags |= SR_MQFLAG_MIN; | |
98 | if (flags2 & FLAGS2_MAX_MASK) | |
99 | analog->mqflags |= SR_MQFLAG_MAX; | |
100 | if (flags2 & FLAGS2_AVE_MASK) | |
101 | analog->mqflags |= SR_MQFLAG_AVG; | |
102 | ||
472bef39 ML |
103 | value = 0; |
104 | divisor = 1; | |
105 | ||
106 | for (i = 0; i < 5; i++) { | |
118268a2 | 107 | segments = decode_pair(buf + 1 + 2*i); |
472bef39 ML |
108 | for (j = 0; j < ARRAY_SIZE(lookup); j++) { |
109 | if (lookup[j] == (segments & ~DECIMAL_POINT_MASK)) { | |
110 | value += j * pow(10, i); | |
111 | break; | |
112 | } | |
113 | } | |
114 | if (segments & DECIMAL_POINT_MASK) | |
115 | divisor = pow(10, i); | |
116 | } | |
117 | ||
118 | *floatval = (float) value / divisor; | |
119 | ||
120 | analog->mq = SR_MQ_FREQUENCY; | |
121 | analog->unit = SR_UNIT_REVOLUTIONS_PER_MINUTE; | |
122 | ||
f3cde309 ML |
123 | return SR_OK; |
124 | } |