[libsigrok.git] / hardware / victor-dmm / protocol.c

/*
 * 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 dev_context *devc, unsigned char *data)
{
	struct sr_datafeed_packet packet;
	struct sr_datafeed_analog analog;
	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;

	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 */
	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 = TRUE;
	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.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)
{
	struct dev_context *devc;
	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
	};

	devc = sdi->priv;

	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(devc, data);

	return SR_OK;
}
Commit	Line	Data
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
ac3898d2	20	#include <glib.h>
fa773062 UH	21	#include <string.h>
fa773062 UH	22	#include <math.h>
ac3898d2 BV	23	#include "libsigrok.h"
	24	#include "libsigrok-internal.h"
	25	#include "protocol.h"
ff945683 BV	26
	27	/* Reverse the high nibble into the low nibble */
	28	static uint8_t decode_digit(uint8_t in)
	29	{
	30	uint8_t out, i;
	31
	32	out = 0;
	33	in >>= 4;
	34	for (i = 0x08; i; i >>= 1) {
	35	out >>= 1;
	36	if (in & i)
	37	out \|= 0x08;
	38	}
	39
	40	return out;
	41	}
	42
	43	static void decode_buf(struct dev_context devc, unsigned char data)
	44	{
	45	struct sr_datafeed_packet packet;
	46	struct sr_datafeed_analog analog;
	47	long factor, ivalue;
	48	uint8_t digits[4];
	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;
	51	float fvalue;
	52
	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]);
	57
	58	if (digits[0] == 0x0f && digits[1] == 0x00 && digits[2] == 0x0a &&
	59	digits[3] == 0x0f)
	60	/* The "over limit" (OL) display comes through like this */
	61	ivalue = -1;
	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. */
	64	ivalue = -2;
	65	else {
	66	ivalue = digits[0] * 1000;
	67	ivalue += digits[1] * 100;
	68	ivalue += digits[2] * 10;
	69	ivalue += digits[3];
	70	}
	71
	72	/* Decimal point position */
	73	switch (data[7] >> 4) {
	74	case 0x00:
	75	factor = 0;
	76	break;
	77	case 0x02:
	78	factor = 1;
	79	break;
	80	case 0x04:
	81	factor = 2;
	82	break;
	83	case 0x08:
	84	factor = 3;
	85	break;
	86	default:
fa773062 UH	87	sr_err("Unknown decimal point byte: 0x%.2x.", data[7]);
fa773062 UH	88	break;
ff945683 BV	89	}
	90
	91	/* Minus flag */
	92	minus = data[2] & 0x01;
	93
	94	/* Mode detail symbols on the right side of the digits */
	95	is_duty = is_continuity = is_diode = FALSE;
	96	switch (data[4]) {
	97	case 0x00:
	98	/* None. */
	99	break;
	100	case 0x01:
	101	/* Micro */
	102	factor += 6;
	103	break;
	104	case 0x02:
	105	/* Milli */
	106	factor += 3;
	107	break;
	108	case 0x04:
	109	/* Kilo */
	110	ivalue *= 1000;
	111	break;
	112	case 0x08:
	113	/* Mega */
	114	ivalue *= 1000000;
	115	break;
	116	case 0x10:
	117	/* Continuity shows up as Ohm + this bit */
	118	is_continuity = TRUE;
	119	break;
	120	case 0x20:
	121	/* Diode tester is Volt + this bit */
	122	is_diode = TRUE;
	123	break;
	124	case 0x40:
	125	is_duty = TRUE;
	126	break;
	127	case 0x80:
	128	/* Never seen */
fa773062	129	sr_dbg("Unknown mode right detail: 0x%.2x.", data[4]);
ff945683 BV	130	break;
ff945683 BV	131	default:
fa773062 UH	132	sr_dbg("Unknown/invalid mode right detail: 0x%.2x.", data[4]);
fa773062 UH	133	break;
ff945683 BV	134	}
	135
	136	/* Scale flags on the right, continued */
	137	is_max = is_min = TRUE;
	138	if (data[5] & 0x04)
	139	is_max = TRUE;
	140	if (data[5] & 0x08)
	141	is_min = TRUE;
	142	if (data[5] & 0x40)
	143	/* Nano */
	144	factor += 9;
	145
	146	/* Mode detail symbols on the left side of the digits */
	147	is_auto = is_dc = is_ac = is_hold = is_relative = FALSE;
	148	if (data[6] & 0x04)
	149	is_auto = TRUE;
	150	if (data[6] & 0x08)
	151	is_dc = TRUE;
	152	if (data[6] & 0x10)
	153	is_ac = TRUE;
	154	if (data[6] & 0x20)
	155	is_relative = TRUE;
	156	if (data[6] & 0x40)
	157	is_hold = TRUE;
	158
	159	fvalue = (float)ivalue / pow(10, factor);
	160	if (minus)
	161	fvalue = -fvalue;
	162
	163	memset(&analog, 0, sizeof(struct sr_datafeed_analog));
	164
	165	/* Measurement mode */
	166	analog.mq = -1;
	167	switch (data[3]) {
	168	case 0x00:
	169	if (is_duty) {
	170	analog.mq = SR_MQ_DUTY_CYCLE;
	171	analog.unit = SR_UNIT_PERCENTAGE;
	172	} else
fa773062	173	sr_dbg("Unknown measurement mode: %.2x.", data[3]);
ff945683 BV	174	break;
	175	case 0x01:
	176	if (is_diode) {
	177	analog.mq = SR_MQ_VOLTAGE;
	178	analog.unit = SR_UNIT_VOLT;
	179	analog.mqflags \|= SR_MQFLAG_DIODE;
	180	if (ivalue < 0)
	181	fvalue = NAN;
	182	} else {
	183	if (ivalue < 0)
	184	break;
	185	analog.mq = SR_MQ_VOLTAGE;
	186	analog.unit = SR_UNIT_VOLT;
	187	if (is_ac)
	188	analog.mqflags \|= SR_MQFLAG_AC;
	189	if (is_dc)
	190	analog.mqflags \|= SR_MQFLAG_DC;
	191	}
	192	break;
	193	case 0x02:
	194	analog.mq = SR_MQ_CURRENT;
	195	analog.unit = SR_UNIT_AMPERE;
	196	if (is_ac)
	197	analog.mqflags \|= SR_MQFLAG_AC;
	198	if (is_dc)
	199	analog.mqflags \|= SR_MQFLAG_DC;
	200	break;
	201	case 0x04:
	202	if (is_continuity) {
	203	analog.mq = SR_MQ_CONTINUITY;
	204	analog.unit = SR_UNIT_BOOLEAN;
	205	fvalue = ivalue < 0 ? 0.0 : 1.0;
	206	} else {
	207	analog.mq = SR_MQ_RESISTANCE;
	208	analog.unit = SR_UNIT_OHM;
	209	if (ivalue < 0)
	210	fvalue = INFINITY;
	211	}
	212	break;
	213	case 0x08:
	214	/* Never seen */
fa773062	215	sr_dbg("Unknown measurement mode: 0x%.2x.", data[3]);
ff945683 BV	216	break;
	217	case 0x10:
	218	analog.mq = SR_MQ_FREQUENCY;
	219	analog.unit = SR_UNIT_HERTZ;
	220	break;
	221	case 0x20:
	222	analog.mq = SR_MQ_CAPACITANCE;
	223	analog.unit = SR_UNIT_FARAD;
	224	break;
	225	case 0x40:
	226	analog.mq = SR_MQ_TEMPERATURE;
	227	analog.unit = SR_UNIT_CELSIUS;
	228	break;
	229	case 0x80:
	230	analog.mq = SR_MQ_TEMPERATURE;
	231	analog.unit = SR_UNIT_FAHRENHEIT;
	232	break;
	233	default:
fa773062 UH	234	sr_dbg("Unknown/invalid measurement mode: 0x%.2x.", data[3]);
fa773062 UH	235	break;
ff945683 BV	236	}
	237	if (analog.mq == -1)
	238	return;
	239
	240	if (is_auto)
	241	analog.mqflags \|= SR_MQFLAG_AUTORANGE;
	242	if (is_hold)
	243	analog.mqflags \|= SR_MQFLAG_HOLD;
	244	if (is_max)
	245	analog.mqflags \|= SR_MQFLAG_MAX;
	246	if (is_min)
	247	analog.mqflags \|= SR_MQFLAG_MIN;
	248	if (is_relative)
	249	analog.mqflags \|= SR_MQFLAG_RELATIVE;
	250
	251	analog.num_samples = 1;
	252	analog.data = &fvalue;
	253	packet.type = SR_DF_ANALOG;
	254	packet.payload = &analog;
	255	sr_session_send(devc->cb_data, &packet);
	256
	257	devc->num_samples++;
	258	}
	259
	260	SR_PRIV int victor_dmm_receive_data(struct sr_dev_inst sdi, unsigned char buf)
ac3898d2	261	{
ac3898d2	262	struct dev_context *devc;
ff945683 BV	263	GString *dbg;
	264	int i;
	265	unsigned char data[DMM_DATA_SIZE];
	266	unsigned char obfuscation[DMM_DATA_SIZE] = "jodenxunickxia";
	267	unsigned char shuffle[DMM_DATA_SIZE] = {
	268	6, 13, 5, 11, 2, 7, 9, 8, 3, 10, 12, 0, 4, 1
	269	};
ac3898d2	270
ff945683	271	devc = sdi->priv;
ac3898d2	272
ff945683 BV	273	for (i = 0; i < DMM_DATA_SIZE && buf[i] == 0; i++);
	274	if (i == DMM_DATA_SIZE) {
	275	/* This DMM outputs all zeroes from time to time, just ignore it. */
	276	sr_dbg("Received all zeroes.");
	277	return SR_OK;
	278	}
ac3898d2	279
ff945683 BV	280	/* Deobfuscate and reorder data. */
	281	for (i = 0; i < DMM_DATA_SIZE; i++)
	282	data[shuffle[i]] = (buf[i] - obfuscation[i]) & 0xff;
	283
	284	if (sr_log_loglevel_get() >= SR_LOG_SPEW) {
	285	dbg = g_string_sized_new(128);
	286	g_string_printf(dbg, "Deobfuscated.");
	287	for (i = 0; i < DMM_DATA_SIZE; i++)
	288	g_string_append_printf(dbg, " %.2x", data[i]);
	289	sr_spew("%s", dbg->str);
	290	g_string_free(dbg, TRUE);
ac3898d2 BV	291	}
ac3898d2 BV	292
ff945683 BV	293	decode_buf(devc, data);
	294
	295	return SR_OK;
ac3898d2	296	}