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ac3898d2 BV |
1 | /* |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2012 Bert Vermeulen <bert@biot.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 | ||
6ec6c43b | 20 | #include <config.h> |
ac3898d2 | 21 | #include <glib.h> |
fa773062 UH |
22 | #include <string.h> |
23 | #include <math.h> | |
c1aae900 | 24 | #include <libsigrok/libsigrok.h> |
ac3898d2 BV |
25 | #include "libsigrok-internal.h" |
26 | #include "protocol.h" | |
ff945683 BV |
27 | |
28 | /* Reverse the high nibble into the low nibble */ | |
29 | static uint8_t decode_digit(uint8_t in) | |
30 | { | |
31 | uint8_t out, i; | |
32 | ||
33 | out = 0; | |
34 | in >>= 4; | |
35 | for (i = 0x08; i; i >>= 1) { | |
36 | out >>= 1; | |
37 | if (in & i) | |
38 | out |= 0x08; | |
39 | } | |
40 | ||
41 | return out; | |
42 | } | |
43 | ||
69e19dd7 | 44 | static void decode_buf(struct sr_dev_inst *sdi, unsigned char *data) |
ff945683 BV |
45 | { |
46 | struct sr_datafeed_packet packet; | |
edb691fc | 47 | struct sr_datafeed_analog analog; |
a84a26d9 UH |
48 | struct sr_analog_encoding encoding; |
49 | struct sr_analog_meaning meaning; | |
50 | struct sr_analog_spec spec; | |
69e19dd7 | 51 | struct dev_context *devc; |
ff945683 BV |
52 | long factor, ivalue; |
53 | uint8_t digits[4]; | |
54 | gboolean is_duty, is_continuity, is_diode, is_ac, is_dc, is_auto; | |
55 | gboolean is_hold, is_max, is_min, is_relative, minus; | |
56 | float fvalue; | |
57 | ||
69e19dd7 BV |
58 | devc = sdi->priv; |
59 | ||
ff945683 BV |
60 | digits[0] = decode_digit(data[12]); |
61 | digits[1] = decode_digit(data[11]); | |
62 | digits[2] = decode_digit(data[10]); | |
63 | digits[3] = decode_digit(data[9]); | |
64 | ||
65 | if (digits[0] == 0x0f && digits[1] == 0x00 && digits[2] == 0x0a && | |
66 | digits[3] == 0x0f) | |
67 | /* The "over limit" (OL) display comes through like this */ | |
68 | ivalue = -1; | |
69 | else if (digits[0] > 9 || digits[1] > 9 || digits[2] > 9 || digits[3] > 9) | |
70 | /* An invalid digit in any position denotes no value. */ | |
71 | ivalue = -2; | |
72 | else { | |
73 | ivalue = digits[0] * 1000; | |
74 | ivalue += digits[1] * 100; | |
75 | ivalue += digits[2] * 10; | |
76 | ivalue += digits[3]; | |
77 | } | |
78 | ||
79 | /* Decimal point position */ | |
6375e1c3 | 80 | factor = 0; |
ff945683 BV |
81 | switch (data[7] >> 4) { |
82 | case 0x00: | |
83 | factor = 0; | |
84 | break; | |
85 | case 0x02: | |
86 | factor = 1; | |
87 | break; | |
88 | case 0x04: | |
89 | factor = 2; | |
90 | break; | |
91 | case 0x08: | |
92 | factor = 3; | |
93 | break; | |
94 | default: | |
fa773062 UH |
95 | sr_err("Unknown decimal point byte: 0x%.2x.", data[7]); |
96 | break; | |
ff945683 BV |
97 | } |
98 | ||
99 | /* Minus flag */ | |
100 | minus = data[2] & 0x01; | |
101 | ||
102 | /* Mode detail symbols on the right side of the digits */ | |
103 | is_duty = is_continuity = is_diode = FALSE; | |
104 | switch (data[4]) { | |
105 | case 0x00: | |
106 | /* None. */ | |
107 | break; | |
108 | case 0x01: | |
109 | /* Micro */ | |
110 | factor += 6; | |
111 | break; | |
112 | case 0x02: | |
113 | /* Milli */ | |
114 | factor += 3; | |
115 | break; | |
116 | case 0x04: | |
117 | /* Kilo */ | |
118 | ivalue *= 1000; | |
119 | break; | |
120 | case 0x08: | |
121 | /* Mega */ | |
122 | ivalue *= 1000000; | |
123 | break; | |
124 | case 0x10: | |
125 | /* Continuity shows up as Ohm + this bit */ | |
126 | is_continuity = TRUE; | |
127 | break; | |
128 | case 0x20: | |
129 | /* Diode tester is Volt + this bit */ | |
130 | is_diode = TRUE; | |
131 | break; | |
132 | case 0x40: | |
133 | is_duty = TRUE; | |
134 | break; | |
135 | case 0x80: | |
136 | /* Never seen */ | |
fa773062 | 137 | sr_dbg("Unknown mode right detail: 0x%.2x.", data[4]); |
ff945683 BV |
138 | break; |
139 | default: | |
fa773062 UH |
140 | sr_dbg("Unknown/invalid mode right detail: 0x%.2x.", data[4]); |
141 | break; | |
ff945683 BV |
142 | } |
143 | ||
144 | /* Scale flags on the right, continued */ | |
b178c79d | 145 | is_max = is_min = FALSE; |
ff945683 BV |
146 | if (data[5] & 0x04) |
147 | is_max = TRUE; | |
148 | if (data[5] & 0x08) | |
149 | is_min = TRUE; | |
150 | if (data[5] & 0x40) | |
151 | /* Nano */ | |
152 | factor += 9; | |
153 | ||
154 | /* Mode detail symbols on the left side of the digits */ | |
155 | is_auto = is_dc = is_ac = is_hold = is_relative = FALSE; | |
156 | if (data[6] & 0x04) | |
157 | is_auto = TRUE; | |
158 | if (data[6] & 0x08) | |
159 | is_dc = TRUE; | |
160 | if (data[6] & 0x10) | |
161 | is_ac = TRUE; | |
162 | if (data[6] & 0x20) | |
163 | is_relative = TRUE; | |
164 | if (data[6] & 0x40) | |
165 | is_hold = TRUE; | |
166 | ||
167 | fvalue = (float)ivalue / pow(10, factor); | |
168 | if (minus) | |
169 | fvalue = -fvalue; | |
170 | ||
41caa319 | 171 | sr_analog_init(&analog, &encoding, &meaning, &spec, 4); |
ff945683 BV |
172 | |
173 | /* Measurement mode */ | |
a84a26d9 UH |
174 | meaning.channels = sdi->channels; |
175 | meaning.mq = 0; | |
ff945683 BV |
176 | switch (data[3]) { |
177 | case 0x00: | |
178 | if (is_duty) { | |
a84a26d9 UH |
179 | meaning.mq = SR_MQ_DUTY_CYCLE; |
180 | meaning.unit = SR_UNIT_PERCENTAGE; | |
ff945683 | 181 | } else |
fa773062 | 182 | sr_dbg("Unknown measurement mode: %.2x.", data[3]); |
ff945683 BV |
183 | break; |
184 | case 0x01: | |
185 | if (is_diode) { | |
a84a26d9 UH |
186 | meaning.mq = SR_MQ_VOLTAGE; |
187 | meaning.unit = SR_UNIT_VOLT; | |
188 | meaning.mqflags |= SR_MQFLAG_DIODE; | |
ff945683 BV |
189 | if (ivalue < 0) |
190 | fvalue = NAN; | |
191 | } else { | |
192 | if (ivalue < 0) | |
193 | break; | |
a84a26d9 UH |
194 | meaning.mq = SR_MQ_VOLTAGE; |
195 | meaning.unit = SR_UNIT_VOLT; | |
ff945683 | 196 | if (is_ac) |
a84a26d9 | 197 | meaning.mqflags |= SR_MQFLAG_AC; |
ff945683 | 198 | if (is_dc) |
a84a26d9 | 199 | meaning.mqflags |= SR_MQFLAG_DC; |
ff945683 BV |
200 | } |
201 | break; | |
202 | case 0x02: | |
a84a26d9 UH |
203 | meaning.mq = SR_MQ_CURRENT; |
204 | meaning.unit = SR_UNIT_AMPERE; | |
ff945683 | 205 | if (is_ac) |
a84a26d9 | 206 | meaning.mqflags |= SR_MQFLAG_AC; |
ff945683 | 207 | if (is_dc) |
a84a26d9 | 208 | meaning.mqflags |= SR_MQFLAG_DC; |
ff945683 BV |
209 | break; |
210 | case 0x04: | |
211 | if (is_continuity) { | |
a84a26d9 UH |
212 | meaning.mq = SR_MQ_CONTINUITY; |
213 | meaning.unit = SR_UNIT_BOOLEAN; | |
ff945683 BV |
214 | fvalue = ivalue < 0 ? 0.0 : 1.0; |
215 | } else { | |
a84a26d9 UH |
216 | meaning.mq = SR_MQ_RESISTANCE; |
217 | meaning.unit = SR_UNIT_OHM; | |
ff945683 BV |
218 | if (ivalue < 0) |
219 | fvalue = INFINITY; | |
220 | } | |
221 | break; | |
222 | case 0x08: | |
223 | /* Never seen */ | |
fa773062 | 224 | sr_dbg("Unknown measurement mode: 0x%.2x.", data[3]); |
ff945683 BV |
225 | break; |
226 | case 0x10: | |
a84a26d9 UH |
227 | meaning.mq = SR_MQ_FREQUENCY; |
228 | meaning.unit = SR_UNIT_HERTZ; | |
ff945683 BV |
229 | break; |
230 | case 0x20: | |
a84a26d9 UH |
231 | meaning.mq = SR_MQ_CAPACITANCE; |
232 | meaning.unit = SR_UNIT_FARAD; | |
ff945683 BV |
233 | break; |
234 | case 0x40: | |
a84a26d9 UH |
235 | meaning.mq = SR_MQ_TEMPERATURE; |
236 | meaning.unit = SR_UNIT_CELSIUS; | |
ff945683 BV |
237 | break; |
238 | case 0x80: | |
a84a26d9 UH |
239 | meaning.mq = SR_MQ_TEMPERATURE; |
240 | meaning.unit = SR_UNIT_FAHRENHEIT; | |
ff945683 BV |
241 | break; |
242 | default: | |
fa773062 UH |
243 | sr_dbg("Unknown/invalid measurement mode: 0x%.2x.", data[3]); |
244 | break; | |
ff945683 | 245 | } |
a84a26d9 | 246 | if (meaning.mq == 0) |
ff945683 BV |
247 | return; |
248 | ||
249 | if (is_auto) | |
a84a26d9 | 250 | meaning.mqflags |= SR_MQFLAG_AUTORANGE; |
ff945683 | 251 | if (is_hold) |
a84a26d9 | 252 | meaning.mqflags |= SR_MQFLAG_HOLD; |
ff945683 | 253 | if (is_max) |
a84a26d9 | 254 | meaning.mqflags |= SR_MQFLAG_MAX; |
ff945683 | 255 | if (is_min) |
a84a26d9 | 256 | meaning.mqflags |= SR_MQFLAG_MIN; |
ff945683 | 257 | if (is_relative) |
a84a26d9 UH |
258 | meaning.mqflags |= SR_MQFLAG_RELATIVE; |
259 | ||
ff945683 | 260 | analog.data = &fvalue; |
a84a26d9 | 261 | analog.num_samples = 1; |
a84a26d9 | 262 | |
edb691fc | 263 | packet.type = SR_DF_ANALOG; |
ff945683 BV |
264 | packet.payload = &analog; |
265 | sr_session_send(devc->cb_data, &packet); | |
266 | ||
267 | devc->num_samples++; | |
268 | } | |
269 | ||
270 | SR_PRIV int victor_dmm_receive_data(struct sr_dev_inst *sdi, unsigned char *buf) | |
ac3898d2 | 271 | { |
ff945683 BV |
272 | GString *dbg; |
273 | int i; | |
274 | unsigned char data[DMM_DATA_SIZE]; | |
275 | unsigned char obfuscation[DMM_DATA_SIZE] = "jodenxunickxia"; | |
276 | unsigned char shuffle[DMM_DATA_SIZE] = { | |
277 | 6, 13, 5, 11, 2, 7, 9, 8, 3, 10, 12, 0, 4, 1 | |
278 | }; | |
ac3898d2 | 279 | |
ff945683 BV |
280 | for (i = 0; i < DMM_DATA_SIZE && buf[i] == 0; i++); |
281 | if (i == DMM_DATA_SIZE) { | |
282 | /* This DMM outputs all zeroes from time to time, just ignore it. */ | |
283 | sr_dbg("Received all zeroes."); | |
284 | return SR_OK; | |
285 | } | |
ac3898d2 | 286 | |
ff945683 BV |
287 | /* Deobfuscate and reorder data. */ |
288 | for (i = 0; i < DMM_DATA_SIZE; i++) | |
289 | data[shuffle[i]] = (buf[i] - obfuscation[i]) & 0xff; | |
290 | ||
291 | if (sr_log_loglevel_get() >= SR_LOG_SPEW) { | |
292 | dbg = g_string_sized_new(128); | |
293 | g_string_printf(dbg, "Deobfuscated."); | |
294 | for (i = 0; i < DMM_DATA_SIZE; i++) | |
295 | g_string_append_printf(dbg, " %.2x", data[i]); | |
296 | sr_spew("%s", dbg->str); | |
297 | g_string_free(dbg, TRUE); | |
ac3898d2 BV |
298 | } |
299 | ||
69e19dd7 | 300 | decode_buf(sdi, data); |
ff945683 BV |
301 | |
302 | return SR_OK; | |
ac3898d2 | 303 | } |