X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=src%2Fhardware%2Fvictor-dmm%2Fprotocol.c;fp=src%2Fhardware%2Fvictor-dmm%2Fprotocol.c;h=6af51419326694c6241c349b850bb5c04a70a393;hb=155b680da482cea2381becb73c51cfb838bff31e;hp=0000000000000000000000000000000000000000;hpb=43cd4637285833706f8a404ca027bcf0ee75b9ae;p=libsigrok.git

diff --git a/src/hardware/victor-dmm/protocol.c b/src/hardware/victor-dmm/protocol.c
new file mode 100644
index 00000000..6af51419
--- /dev/null
+++ b/src/hardware/victor-dmm/protocol.c
@@ -0,0 +1,298 @@
+/*
+ * 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;
+}