2 * This file is part of the sigrok 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/>.
20 #include "libsigrok.h"
21 #include "libsigrok-internal.h"
22 #include "genericdmm.h"
27 #define DMM_DATA_SIZE 14
30 /* Reverse the high nibble into the low nibble */
31 static uint8_t decode_digit(uint8_t in)
37 for (i = 0x08; i; i >>= 1) {
46 static void decode_buf(struct dev_context *devc, unsigned char *data)
48 struct sr_datafeed_packet packet;
49 struct sr_datafeed_analog analog;
52 gboolean is_duty, is_continuity, is_diode, is_ac, is_dc, is_auto,
53 is_hold, is_max, is_min, is_relative, minus;
56 digits[0] = decode_digit(data[12]);
57 digits[1] = decode_digit(data[11]);
58 digits[2] = decode_digit(data[10]);
59 digits[3] = decode_digit(data[9]);
60 if (digits[0] == 0x0f && digits[1] == 0x00 && digits[2] == 0x0a &&
62 /* The "over limit" (OL) display comes through like this */
64 else if (digits[0] > 9 || digits[1] > 9 || digits[2] > 9 || digits[3] > 9)
65 /* An invalid digit in any position denotes no value. */
68 ivalue = digits[0] * 1000;
69 ivalue += digits[1] * 100;
70 ivalue += digits[2] * 10;
74 /* Decimal point position */
75 switch (data[7] >> 4) {
89 sr_err("genericdmm/victor-70c: unknown decimal point value %.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("genericdmm/victor-70c: unknown mode right detail %.2x", data[4]);
133 sr_dbg("genericdmm/victor-70c: unknown/invalid mode right detail %.2x", data[4]);
136 /* Scale flags on the right, continued */
137 is_max = is_min = TRUE;
146 /* Mode detail symbols on the left side of the digits */
147 is_auto = is_dc = is_ac = is_hold = is_relative = FALSE;
159 fvalue = (float)ivalue / pow(10, factor);
163 memset(&analog, 0, sizeof(struct sr_datafeed_analog));
165 /* Measurement mode */
170 analog.mq = SR_MQ_DUTY_CYCLE;
171 analog.unit = SR_UNIT_PERCENTAGE;
173 sr_dbg("genericdmm/victor-70c: unknown measurement mode %.2x", data[3]);
177 analog.mq = SR_MQ_VOLTAGE;
178 analog.unit = SR_UNIT_VOLT;
179 analog.mqflags |= SR_MQFLAG_DIODE;
185 analog.mq = SR_MQ_VOLTAGE;
186 analog.unit = SR_UNIT_VOLT;
188 analog.mqflags |= SR_MQFLAG_AC;
190 analog.mqflags |= SR_MQFLAG_DC;
194 analog.mq = SR_MQ_CURRENT;
195 analog.unit = SR_UNIT_AMPERE;
197 analog.mqflags |= SR_MQFLAG_AC;
199 analog.mqflags |= SR_MQFLAG_DC;
203 analog.mq = SR_MQ_CONTINUITY;
204 analog.unit = SR_UNIT_BOOLEAN;
205 fvalue = ivalue < 0 ? 0.0 : 1.0;
207 analog.mq = SR_MQ_RESISTANCE;
208 analog.unit = SR_UNIT_OHM;
213 sr_dbg("genericdmm/victor-70c: unknown measurement mode %.2x", data[3]);
216 analog.mq = SR_MQ_FREQUENCY;
217 analog.mq = SR_UNIT_HERTZ;
220 analog.mq = SR_MQ_CAPACITANCE;
221 analog.unit = SR_UNIT_FARAD;
224 analog.mq = SR_MQ_TEMPERATURE;
225 analog.unit = SR_UNIT_CELSIUS;
228 analog.mq = SR_MQ_TEMPERATURE;
229 analog.unit = SR_UNIT_FAHRENHEIT;
232 sr_dbg("genericdmm/victor-70c: unknown/invalid measurement mode %.2x", data[3]);
238 analog.mqflags |= SR_MQFLAG_AUTORANGE;
240 analog.mqflags |= SR_MQFLAG_HOLD;
242 analog.mqflags |= SR_MQFLAG_MAX;
244 analog.mqflags |= SR_MQFLAG_MIN;
246 analog.mqflags |= SR_MQFLAG_RELATIVE;
248 analog.num_samples = 1;
249 analog.data = &fvalue;
250 packet.type = SR_DF_ANALOG;
251 packet.payload = &analog;
252 sr_session_send(devc->cb_data, &packet);
258 static int victor70c_data(struct sr_dev_inst *sdi)
260 struct dev_context *devc;
263 unsigned char buf[DMM_DATA_SIZE], data[DMM_DATA_SIZE];
264 unsigned char obfuscation[DMM_DATA_SIZE] = "jodenxunickxia";
265 unsigned char shuffle[DMM_DATA_SIZE] = {
266 6, 13, 5, 11, 2, 7, 9, 8, 3, 10, 12, 0, 4, 1
271 if (sdi->status == SR_ST_INACTIVE) {
272 /* First time through. */
273 if (libusb_kernel_driver_active(devc->usb->devhdl, 0) == 1) {
274 if (libusb_detach_kernel_driver(devc->usb->devhdl, 0) < 0) {
275 sr_err("genericdmm/victor-70c: failed to detach kernel driver");
280 if (libusb_claim_interface(devc->usb->devhdl, 0)) {
281 sr_err("genericdmm/victor-70c: failed to claim interface 0");
284 sdi->status = SR_ST_ACTIVE;
287 ret = libusb_interrupt_transfer(devc->usb->devhdl, 0x81, buf, DMM_DATA_SIZE,
290 sr_err("genericdmm/victor-70c: failed to get data: libusb error %d", ret);
294 if (len != DMM_DATA_SIZE) {
295 sr_dbg("genericdmm/victor-70c: short packet: received %d/%d bytes",
300 for (i = 0; i < DMM_DATA_SIZE && buf[i] == 0; i++);
301 if (i == DMM_DATA_SIZE) {
302 /* This DMM outputs all zeroes from time to time, just ignore it. */
303 sr_dbg("genericdmm/victor-70c: received all zeroes");
307 /* Deobfuscate and reorder data. */
308 for (i = 0; i < DMM_DATA_SIZE; i++)
309 data[shuffle[i]] = (buf[i] - obfuscation[i]) & 0xff;
311 if (sr_log_loglevel_get() >= SR_LOG_SPEW) {
312 dbg = g_string_sized_new(128);
313 g_string_printf(dbg, "genericdmm/victor-70c: deobfuscated");
314 for (i = 0; i < DMM_DATA_SIZE; i++)
315 g_string_append_printf(dbg, " %.2x", data[i]);
316 sr_spew("%s", dbg->str);
317 g_string_free(dbg, TRUE);
320 decode_buf(devc, data);
326 SR_PRIV struct dmmchip dmmchip_victor70c = {
327 .data = victor70c_data,