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a24c3f4a JH |
1 | /* |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2014 Janne Huttunen <jahuttun@gmail.com> | |
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 3 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, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | /** | |
21 | * @file | |
22 | * | |
23 | * Brymen BM25x serial protocol parser. | |
24 | */ | |
25 | ||
6ec6c43b | 26 | #include <config.h> |
a24c3f4a | 27 | #include <math.h> |
c1aae900 | 28 | #include <libsigrok/libsigrok.h> |
a24c3f4a JH |
29 | #include "libsigrok-internal.h" |
30 | ||
31 | #define LOG_PREFIX "brymen-bm25x" | |
32 | ||
33 | #define MAX_DIGITS 4 | |
34 | ||
35 | SR_PRIV gboolean sr_brymen_bm25x_packet_valid(const uint8_t *buf) | |
36 | { | |
37 | int i; | |
38 | ||
39 | if (buf[0] != 2) | |
40 | return FALSE; | |
41 | ||
42 | for (i = 1; i < BRYMEN_BM25X_PACKET_SIZE; i++) | |
43 | if ((buf[i] >> 4) != i) | |
44 | return FALSE; | |
45 | ||
46 | return TRUE; | |
47 | } | |
48 | ||
49 | static int decode_digit(int num, const uint8_t *buf) | |
50 | { | |
51 | int val; | |
52 | ||
53 | val = (buf[3 + 2 * num] & 0xe) | ((buf[4 + 2 * num] << 4) & 0xf0); | |
54 | ||
55 | switch (val) { | |
56 | case 0xbe: return 0; | |
57 | case 0xa0: return 1; | |
58 | case 0xda: return 2; | |
59 | case 0xf8: return 3; | |
60 | case 0xe4: return 4; | |
61 | case 0x7c: return 5; | |
62 | case 0x7e: return 6; | |
63 | case 0xa8: return 7; | |
64 | case 0xfe: return 8; | |
65 | case 0xfc: return 9; | |
66 | case 0x00: return ' '; | |
67 | case 0x40: return '-'; | |
68 | case 0x16: return 'L'; | |
69 | case 0x1e: return 'C'; | |
70 | case 0x4e: return 'F'; | |
71 | case 0x5e: return 'E'; | |
72 | case 0x62: return 'n'; | |
73 | case 0x42: return 'r'; | |
74 | default: | |
75 | sr_dbg("Unknown digit: 0x%02x.", val); | |
76 | return -1; | |
77 | } | |
78 | } | |
79 | ||
80 | static int decode_point(const uint8_t *buf) | |
81 | { | |
82 | int i, p = 0; | |
83 | ||
84 | for (i = 1; i < MAX_DIGITS; i++) { | |
85 | if ((buf[11 - 2 * i] & 1) == 0) | |
86 | continue; | |
87 | if (p != 0) { | |
88 | sr_spew("Multiple decimal points found!"); | |
89 | return -1; | |
90 | } | |
91 | p = i; | |
92 | } | |
93 | ||
94 | return p; | |
95 | } | |
96 | ||
97 | static float scale_value(float val, int point, int digits) | |
98 | { | |
99 | int pos; | |
100 | ||
101 | pos = point ? point + digits - MAX_DIGITS : 0; | |
102 | ||
103 | switch (pos) { | |
104 | case 0: return val; | |
105 | case 1: return val * 1e-1; | |
106 | case 2: return val * 1e-2; | |
107 | case 3: return val * 1e-3; | |
108 | } | |
109 | ||
110 | sr_dbg("Invalid decimal point %d (%d digits).", point, digits); | |
111 | ||
112 | return NAN; | |
113 | } | |
114 | ||
115 | static float decode_prefix(const uint8_t *buf) | |
116 | { | |
117 | if (buf[11] & 2) return 1e+6; | |
118 | if (buf[11] & 1) return 1e+3; | |
119 | if (buf[13] & 1) return 1e-3; | |
120 | if (buf[13] & 2) return 1e-6; | |
121 | if (buf[12] & 1) return 1e-9; | |
122 | ||
123 | return 1.0f; | |
124 | } | |
125 | ||
126 | static float decode_value(const uint8_t *buf) | |
127 | { | |
128 | float val = 0.0f; | |
129 | int i, digit; | |
130 | ||
131 | for (i = 0; i < MAX_DIGITS; i++) { | |
132 | digit = decode_digit(i, buf); | |
133 | if (i == 3 && (digit == 'C' || digit == 'F')) | |
134 | break; | |
135 | if (digit < 0 || digit > 9) | |
136 | goto special; | |
137 | val = 10.0 * val + digit; | |
138 | } | |
139 | ||
140 | return scale_value(val, decode_point(buf), i); | |
141 | ||
142 | special: | |
143 | if (decode_digit(1, buf) == 0 && decode_digit(2, buf) == 'L') | |
144 | return INFINITY; | |
145 | ||
146 | return NAN; | |
147 | } | |
148 | ||
149 | SR_PRIV int sr_brymen_bm25x_parse(const uint8_t *buf, float *floatval, | |
5faebab2 | 150 | struct sr_datafeed_analog_old *analog, void *info) |
a24c3f4a JH |
151 | { |
152 | float val; | |
153 | ||
154 | (void)info; | |
155 | ||
156 | analog->mq = SR_MQ_GAIN; | |
157 | analog->unit = SR_UNIT_UNITLESS; | |
158 | analog->mqflags = 0; | |
159 | ||
160 | if (buf[1] & 8) | |
161 | analog->mqflags |= SR_MQFLAG_AUTORANGE; | |
162 | if (buf[1] & 4) | |
163 | analog->mqflags |= SR_MQFLAG_DC; | |
164 | if (buf[1] & 2) | |
165 | analog->mqflags |= SR_MQFLAG_AC; | |
166 | if (buf[1] & 1) | |
167 | analog->mqflags |= SR_MQFLAG_RELATIVE; | |
168 | if (buf[11] & 8) | |
169 | analog->mqflags |= SR_MQFLAG_HOLD; | |
170 | if (buf[13] & 8) | |
171 | analog->mqflags |= SR_MQFLAG_MAX; | |
172 | if (buf[14] & 8) | |
173 | analog->mqflags |= SR_MQFLAG_MIN; | |
174 | ||
175 | if (buf[14] & 4) { | |
176 | analog->mq = SR_MQ_VOLTAGE; | |
177 | analog->unit = SR_UNIT_VOLT; | |
178 | if ((analog->mqflags & (SR_MQFLAG_DC | SR_MQFLAG_AC)) == 0) | |
179 | analog->mqflags |= SR_MQFLAG_DIODE; | |
180 | } | |
181 | if (buf[14] & 2) { | |
182 | analog->mq = SR_MQ_CURRENT; | |
183 | analog->unit = SR_UNIT_AMPERE; | |
184 | } | |
185 | if (buf[12] & 4) { | |
186 | analog->mq = SR_MQ_RESISTANCE; | |
187 | analog->unit = SR_UNIT_OHM; | |
188 | } | |
189 | if (buf[13] & 4) { | |
190 | analog->mq = SR_MQ_CAPACITANCE; | |
191 | analog->unit = SR_UNIT_FARAD; | |
192 | } | |
193 | if (buf[12] & 2) { | |
194 | analog->mq = SR_MQ_FREQUENCY; | |
195 | analog->unit = SR_UNIT_HERTZ; | |
196 | } | |
197 | ||
198 | if (decode_digit(3, buf) == 'C') { | |
199 | analog->mq = SR_MQ_TEMPERATURE; | |
200 | analog->unit = SR_UNIT_CELSIUS; | |
201 | } | |
202 | if (decode_digit(3, buf) == 'F') { | |
203 | analog->mq = SR_MQ_TEMPERATURE; | |
204 | analog->unit = SR_UNIT_FAHRENHEIT; | |
205 | } | |
206 | ||
207 | val = decode_value(buf) * decode_prefix(buf); | |
208 | ||
209 | if (buf[3] & 1) | |
210 | val = -val; | |
211 | ||
212 | *floatval = val; | |
213 | ||
214 | return SR_OK; | |
215 | } |