--- /dev/null
+/*
+ * This file is part of the libsigrok project.
+ *
+ * Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <glib.h>
+#include <string.h>
+#include <math.h>
+#include "libsigrok.h"
+#include "libsigrok-internal.h"
+#include "protocol.h"
+
+/* Reverse the high nibble into the low nibble */
+static uint8_t decode_digit(uint8_t in)
+{
+ uint8_t out, i;
+
+ out = 0;
+ in >>= 4;
+ for (i = 0x08; i; i >>= 1) {
+ out >>= 1;
+ if (in & i)
+ out |= 0x08;
+ }
+
+ return out;
+}
+
+static void decode_buf(struct sr_dev_inst *sdi, unsigned char *data)
+{
+ struct sr_datafeed_packet packet;
+ struct sr_datafeed_analog analog;
+ struct dev_context *devc;
+ long factor, ivalue;
+ uint8_t digits[4];
+ gboolean is_duty, is_continuity, is_diode, is_ac, is_dc, is_auto;
+ gboolean is_hold, is_max, is_min, is_relative, minus;
+ float fvalue;
+
+ devc = sdi->priv;
+
+ digits[0] = decode_digit(data[12]);
+ digits[1] = decode_digit(data[11]);
+ digits[2] = decode_digit(data[10]);
+ digits[3] = decode_digit(data[9]);
+
+ if (digits[0] == 0x0f && digits[1] == 0x00 && digits[2] == 0x0a &&
+ digits[3] == 0x0f)
+ /* The "over limit" (OL) display comes through like this */
+ ivalue = -1;
+ else if (digits[0] > 9 || digits[1] > 9 || digits[2] > 9 || digits[3] > 9)
+ /* An invalid digit in any position denotes no value. */
+ ivalue = -2;
+ else {
+ ivalue = digits[0] * 1000;
+ ivalue += digits[1] * 100;
+ ivalue += digits[2] * 10;
+ ivalue += digits[3];
+ }
+
+ /* Decimal point position */
+ factor = 0;
+ switch (data[7] >> 4) {
+ case 0x00:
+ factor = 0;
+ break;
+ case 0x02:
+ factor = 1;
+ break;
+ case 0x04:
+ factor = 2;
+ break;
+ case 0x08:
+ factor = 3;
+ break;
+ default:
+ sr_err("Unknown decimal point byte: 0x%.2x.", data[7]);
+ break;
+ }
+
+ /* Minus flag */
+ minus = data[2] & 0x01;
+
+ /* Mode detail symbols on the right side of the digits */
+ is_duty = is_continuity = is_diode = FALSE;
+ switch (data[4]) {
+ case 0x00:
+ /* None. */
+ break;
+ case 0x01:
+ /* Micro */
+ factor += 6;
+ break;
+ case 0x02:
+ /* Milli */
+ factor += 3;
+ break;
+ case 0x04:
+ /* Kilo */
+ ivalue *= 1000;
+ break;
+ case 0x08:
+ /* Mega */
+ ivalue *= 1000000;
+ break;
+ case 0x10:
+ /* Continuity shows up as Ohm + this bit */
+ is_continuity = TRUE;
+ break;
+ case 0x20:
+ /* Diode tester is Volt + this bit */
+ is_diode = TRUE;
+ break;
+ case 0x40:
+ is_duty = TRUE;
+ break;
+ case 0x80:
+ /* Never seen */
+ sr_dbg("Unknown mode right detail: 0x%.2x.", data[4]);
+ break;
+ default:
+ sr_dbg("Unknown/invalid mode right detail: 0x%.2x.", data[4]);
+ break;
+ }
+
+ /* Scale flags on the right, continued */
+ is_max = is_min = FALSE;
+ if (data[5] & 0x04)
+ is_max = TRUE;
+ if (data[5] & 0x08)
+ is_min = TRUE;
+ if (data[5] & 0x40)
+ /* Nano */
+ factor += 9;
+
+ /* Mode detail symbols on the left side of the digits */
+ is_auto = is_dc = is_ac = is_hold = is_relative = FALSE;
+ if (data[6] & 0x04)
+ is_auto = TRUE;
+ if (data[6] & 0x08)
+ is_dc = TRUE;
+ if (data[6] & 0x10)
+ is_ac = TRUE;
+ if (data[6] & 0x20)
+ is_relative = TRUE;
+ if (data[6] & 0x40)
+ is_hold = TRUE;
+
+ fvalue = (float)ivalue / pow(10, factor);
+ if (minus)
+ fvalue = -fvalue;
+
+ memset(&analog, 0, sizeof(struct sr_datafeed_analog));
+
+ /* Measurement mode */
+ analog.mq = -1;
+ switch (data[3]) {
+ case 0x00:
+ if (is_duty) {
+ analog.mq = SR_MQ_DUTY_CYCLE;
+ analog.unit = SR_UNIT_PERCENTAGE;
+ } else
+ sr_dbg("Unknown measurement mode: %.2x.", data[3]);
+ break;
+ case 0x01:
+ if (is_diode) {
+ analog.mq = SR_MQ_VOLTAGE;
+ analog.unit = SR_UNIT_VOLT;
+ analog.mqflags |= SR_MQFLAG_DIODE;
+ if (ivalue < 0)
+ fvalue = NAN;
+ } else {
+ if (ivalue < 0)
+ break;
+ analog.mq = SR_MQ_VOLTAGE;
+ analog.unit = SR_UNIT_VOLT;
+ if (is_ac)
+ analog.mqflags |= SR_MQFLAG_AC;
+ if (is_dc)
+ analog.mqflags |= SR_MQFLAG_DC;
+ }
+ break;
+ case 0x02:
+ analog.mq = SR_MQ_CURRENT;
+ analog.unit = SR_UNIT_AMPERE;
+ if (is_ac)
+ analog.mqflags |= SR_MQFLAG_AC;
+ if (is_dc)
+ analog.mqflags |= SR_MQFLAG_DC;
+ break;
+ case 0x04:
+ if (is_continuity) {
+ analog.mq = SR_MQ_CONTINUITY;
+ analog.unit = SR_UNIT_BOOLEAN;
+ fvalue = ivalue < 0 ? 0.0 : 1.0;
+ } else {
+ analog.mq = SR_MQ_RESISTANCE;
+ analog.unit = SR_UNIT_OHM;
+ if (ivalue < 0)
+ fvalue = INFINITY;
+ }
+ break;
+ case 0x08:
+ /* Never seen */
+ sr_dbg("Unknown measurement mode: 0x%.2x.", data[3]);
+ break;
+ case 0x10:
+ analog.mq = SR_MQ_FREQUENCY;
+ analog.unit = SR_UNIT_HERTZ;
+ break;
+ case 0x20:
+ analog.mq = SR_MQ_CAPACITANCE;
+ analog.unit = SR_UNIT_FARAD;
+ break;
+ case 0x40:
+ analog.mq = SR_MQ_TEMPERATURE;
+ analog.unit = SR_UNIT_CELSIUS;
+ break;
+ case 0x80:
+ analog.mq = SR_MQ_TEMPERATURE;
+ analog.unit = SR_UNIT_FAHRENHEIT;
+ break;
+ default:
+ sr_dbg("Unknown/invalid measurement mode: 0x%.2x.", data[3]);
+ break;
+ }
+ if (analog.mq == -1)
+ return;
+
+ if (is_auto)
+ analog.mqflags |= SR_MQFLAG_AUTORANGE;
+ if (is_hold)
+ analog.mqflags |= SR_MQFLAG_HOLD;
+ if (is_max)
+ analog.mqflags |= SR_MQFLAG_MAX;
+ if (is_min)
+ analog.mqflags |= SR_MQFLAG_MIN;
+ if (is_relative)
+ analog.mqflags |= SR_MQFLAG_RELATIVE;
+
+ analog.channels = sdi->channels;
+ analog.num_samples = 1;
+ analog.data = &fvalue;
+ packet.type = SR_DF_ANALOG;
+ packet.payload = &analog;
+ sr_session_send(devc->cb_data, &packet);
+
+ devc->num_samples++;
+}
+
+SR_PRIV int victor_dmm_receive_data(struct sr_dev_inst *sdi, unsigned char *buf)
+{
+ GString *dbg;
+ int i;
+ unsigned char data[DMM_DATA_SIZE];
+ unsigned char obfuscation[DMM_DATA_SIZE] = "jodenxunickxia";
+ unsigned char shuffle[DMM_DATA_SIZE] = {
+ 6, 13, 5, 11, 2, 7, 9, 8, 3, 10, 12, 0, 4, 1
+ };
+
+ for (i = 0; i < DMM_DATA_SIZE && buf[i] == 0; i++);
+ if (i == DMM_DATA_SIZE) {
+ /* This DMM outputs all zeroes from time to time, just ignore it. */
+ sr_dbg("Received all zeroes.");
+ return SR_OK;
+ }
+
+ /* Deobfuscate and reorder data. */
+ for (i = 0; i < DMM_DATA_SIZE; i++)
+ data[shuffle[i]] = (buf[i] - obfuscation[i]) & 0xff;
+
+ if (sr_log_loglevel_get() >= SR_LOG_SPEW) {
+ dbg = g_string_sized_new(128);
+ g_string_printf(dbg, "Deobfuscated.");
+ for (i = 0; i < DMM_DATA_SIZE; i++)
+ g_string_append_printf(dbg, " %.2x", data[i]);
+ sr_spew("%s", dbg->str);
+ g_string_free(dbg, TRUE);
+ }
+
+ decode_buf(sdi, data);
+
+ return SR_OK;
+}
projects / libsigrok.git / blobdiff