2 * This file is part of the libsigrok project.
4 * Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
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.
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, see <http://www.gnu.org/licenses/>.
23 #include "libsigrok.h"
24 #include "libsigrok-internal.h"
27 /* Reverse the high nibble into the low nibble */
28 static uint8_t decode_digit(uint8_t in)
34 for (i = 0x08; i; i >>= 1) {
43 static void decode_buf(struct dev_context *devc, unsigned char *data)
45 struct sr_datafeed_packet packet;
46 struct sr_datafeed_analog analog;
49 gboolean is_duty, is_continuity, is_diode, is_ac, is_dc, is_auto;
50 gboolean is_hold, is_max, is_min, is_relative, minus;
53 digits[0] = decode_digit(data[12]);
54 digits[1] = decode_digit(data[11]);
55 digits[2] = decode_digit(data[10]);
56 digits[3] = decode_digit(data[9]);
58 if (digits[0] == 0x0f && digits[1] == 0x00 && digits[2] == 0x0a &&
60 /* The "over limit" (OL) display comes through like this */
62 else if (digits[0] > 9 || digits[1] > 9 || digits[2] > 9 || digits[3] > 9)
63 /* An invalid digit in any position denotes no value. */
66 ivalue = digits[0] * 1000;
67 ivalue += digits[1] * 100;
68 ivalue += digits[2] * 10;
72 /* Decimal point position */
74 switch (data[7] >> 4) {
88 sr_err("Unknown decimal point byte: 0x%.2x.", data[7]);
93 minus = data[2] & 0x01;
95 /* Mode detail symbols on the right side of the digits */
96 is_duty = is_continuity = is_diode = FALSE;
118 /* Continuity shows up as Ohm + this bit */
119 is_continuity = TRUE;
122 /* Diode tester is Volt + this bit */
130 sr_dbg("Unknown mode right detail: 0x%.2x.", data[4]);
133 sr_dbg("Unknown/invalid mode right detail: 0x%.2x.", data[4]);
137 /* Scale flags on the right, continued */
138 is_max = is_min = TRUE;
147 /* Mode detail symbols on the left side of the digits */
148 is_auto = is_dc = is_ac = is_hold = is_relative = FALSE;
160 fvalue = (float)ivalue / pow(10, factor);
164 memset(&analog, 0, sizeof(struct sr_datafeed_analog));
166 /* Measurement mode */
171 analog.mq = SR_MQ_DUTY_CYCLE;
172 analog.unit = SR_UNIT_PERCENTAGE;
174 sr_dbg("Unknown measurement mode: %.2x.", data[3]);
178 analog.mq = SR_MQ_VOLTAGE;
179 analog.unit = SR_UNIT_VOLT;
180 analog.mqflags |= SR_MQFLAG_DIODE;
186 analog.mq = SR_MQ_VOLTAGE;
187 analog.unit = SR_UNIT_VOLT;
189 analog.mqflags |= SR_MQFLAG_AC;
191 analog.mqflags |= SR_MQFLAG_DC;
195 analog.mq = SR_MQ_CURRENT;
196 analog.unit = SR_UNIT_AMPERE;
198 analog.mqflags |= SR_MQFLAG_AC;
200 analog.mqflags |= SR_MQFLAG_DC;
204 analog.mq = SR_MQ_CONTINUITY;
205 analog.unit = SR_UNIT_BOOLEAN;
206 fvalue = ivalue < 0 ? 0.0 : 1.0;
208 analog.mq = SR_MQ_RESISTANCE;
209 analog.unit = SR_UNIT_OHM;
216 sr_dbg("Unknown measurement mode: 0x%.2x.", data[3]);
219 analog.mq = SR_MQ_FREQUENCY;
220 analog.unit = SR_UNIT_HERTZ;
223 analog.mq = SR_MQ_CAPACITANCE;
224 analog.unit = SR_UNIT_FARAD;
227 analog.mq = SR_MQ_TEMPERATURE;
228 analog.unit = SR_UNIT_CELSIUS;
231 analog.mq = SR_MQ_TEMPERATURE;
232 analog.unit = SR_UNIT_FAHRENHEIT;
235 sr_dbg("Unknown/invalid measurement mode: 0x%.2x.", data[3]);
242 analog.mqflags |= SR_MQFLAG_AUTORANGE;
244 analog.mqflags |= SR_MQFLAG_HOLD;
246 analog.mqflags |= SR_MQFLAG_MAX;
248 analog.mqflags |= SR_MQFLAG_MIN;
250 analog.mqflags |= SR_MQFLAG_RELATIVE;
252 analog.num_samples = 1;
253 analog.data = &fvalue;
254 packet.type = SR_DF_ANALOG;
255 packet.payload = &analog;
256 sr_session_send(devc->cb_data, &packet);
261 SR_PRIV int victor_dmm_receive_data(struct sr_dev_inst *sdi, unsigned char *buf)
263 struct dev_context *devc;
266 unsigned char data[DMM_DATA_SIZE];
267 unsigned char obfuscation[DMM_DATA_SIZE] = "jodenxunickxia";
268 unsigned char shuffle[DMM_DATA_SIZE] = {
269 6, 13, 5, 11, 2, 7, 9, 8, 3, 10, 12, 0, 4, 1
274 for (i = 0; i < DMM_DATA_SIZE && buf[i] == 0; i++);
275 if (i == DMM_DATA_SIZE) {
276 /* This DMM outputs all zeroes from time to time, just ignore it. */
277 sr_dbg("Received all zeroes.");
281 /* Deobfuscate and reorder data. */
282 for (i = 0; i < DMM_DATA_SIZE; i++)
283 data[shuffle[i]] = (buf[i] - obfuscation[i]) & 0xff;
285 if (sr_log_loglevel_get() >= SR_LOG_SPEW) {
286 dbg = g_string_sized_new(128);
287 g_string_printf(dbg, "Deobfuscated.");
288 for (i = 0; i < DMM_DATA_SIZE; i++)
289 g_string_append_printf(dbg, " %.2x", data[i]);
290 sr_spew("%s", dbg->str);
291 g_string_free(dbg, TRUE);
294 decode_buf(devc, data);