[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 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;
}
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
69e19dd7	43	static void decode_buf(struct sr_dev_inst sdi, unsigned char data)
ff945683 BV	44	{
	45	struct sr_datafeed_packet packet;
	46	struct sr_datafeed_analog analog;
69e19dd7	47	struct dev_context *devc;
ff945683 BV	48	long factor, ivalue;
	49	uint8_t digits[4];
	50	gboolean is_duty, is_continuity, is_diode, is_ac, is_dc, is_auto;
	51	gboolean is_hold, is_max, is_min, is_relative, minus;
	52	float fvalue;
	53
69e19dd7 BV	54	devc = sdi->priv;
69e19dd7 BV	55
ff945683 BV	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
	61	if (digits[0] == 0x0f && digits[1] == 0x00 && digits[2] == 0x0a &&
	62	digits[3] == 0x0f)
	63	/* The "over limit" (OL) display comes through like this */
	64	ivalue = -1;
	65	else if (digits[0] > 9 \|\| digits[1] > 9 \|\| digits[2] > 9 \|\| digits[3] > 9)
	66	/* An invalid digit in any position denotes no value. */
	67	ivalue = -2;
	68	else {
	69	ivalue = digits[0] * 1000;
	70	ivalue += digits[1] * 100;
	71	ivalue += digits[2] * 10;
	72	ivalue += digits[3];
	73	}
	74
	75	/* Decimal point position */
6375e1c3	76	factor = 0;
ff945683 BV	77	switch (data[7] >> 4) {
	78	case 0x00:
	79	factor = 0;
	80	break;
	81	case 0x02:
	82	factor = 1;
	83	break;
	84	case 0x04:
	85	factor = 2;
	86	break;
	87	case 0x08:
	88	factor = 3;
	89	break;
	90	default:
fa773062 UH	91	sr_err("Unknown decimal point byte: 0x%.2x.", data[7]);
fa773062 UH	92	break;
ff945683 BV	93	}
	94
	95	/* Minus flag */
	96	minus = data[2] & 0x01;
	97
	98	/* Mode detail symbols on the right side of the digits */
	99	is_duty = is_continuity = is_diode = FALSE;
	100	switch (data[4]) {
	101	case 0x00:
	102	/* None. */
	103	break;
	104	case 0x01:
	105	/* Micro */
	106	factor += 6;
	107	break;
	108	case 0x02:
	109	/* Milli */
	110	factor += 3;
	111	break;
	112	case 0x04:
	113	/* Kilo */
	114	ivalue *= 1000;
	115	break;
	116	case 0x08:
	117	/* Mega */
	118	ivalue *= 1000000;
	119	break;
	120	case 0x10:
	121	/* Continuity shows up as Ohm + this bit */
	122	is_continuity = TRUE;
	123	break;
	124	case 0x20:
	125	/* Diode tester is Volt + this bit */
	126	is_diode = TRUE;
	127	break;
	128	case 0x40:
	129	is_duty = TRUE;
	130	break;
	131	case 0x80:
	132	/* Never seen */
fa773062	133	sr_dbg("Unknown mode right detail: 0x%.2x.", data[4]);
ff945683 BV	134	break;
ff945683 BV	135	default:
fa773062 UH	136	sr_dbg("Unknown/invalid mode right detail: 0x%.2x.", data[4]);
fa773062 UH	137	break;
ff945683 BV	138	}
	139
	140	/* Scale flags on the right, continued */
b178c79d	141	is_max = is_min = FALSE;
ff945683 BV	142	if (data[5] & 0x04)
	143	is_max = TRUE;
	144	if (data[5] & 0x08)
	145	is_min = TRUE;
	146	if (data[5] & 0x40)
	147	/* Nano */
	148	factor += 9;
	149
	150	/* Mode detail symbols on the left side of the digits */
	151	is_auto = is_dc = is_ac = is_hold = is_relative = FALSE;
	152	if (data[6] & 0x04)
	153	is_auto = TRUE;
	154	if (data[6] & 0x08)
	155	is_dc = TRUE;
	156	if (data[6] & 0x10)
	157	is_ac = TRUE;
	158	if (data[6] & 0x20)
	159	is_relative = TRUE;
	160	if (data[6] & 0x40)
	161	is_hold = TRUE;
	162
	163	fvalue = (float)ivalue / pow(10, factor);
	164	if (minus)
	165	fvalue = -fvalue;
	166
	167	memset(&analog, 0, sizeof(struct sr_datafeed_analog));
	168
	169	/* Measurement mode */
	170	analog.mq = -1;
	171	switch (data[3]) {
	172	case 0x00:
	173	if (is_duty) {
	174	analog.mq = SR_MQ_DUTY_CYCLE;
	175	analog.unit = SR_UNIT_PERCENTAGE;
	176	} else
fa773062	177	sr_dbg("Unknown measurement mode: %.2x.", data[3]);
ff945683 BV	178	break;
	179	case 0x01:
	180	if (is_diode) {
	181	analog.mq = SR_MQ_VOLTAGE;
	182	analog.unit = SR_UNIT_VOLT;
	183	analog.mqflags \|= SR_MQFLAG_DIODE;
	184	if (ivalue < 0)
	185	fvalue = NAN;
	186	} else {
	187	if (ivalue < 0)
	188	break;
	189	analog.mq = SR_MQ_VOLTAGE;
	190	analog.unit = SR_UNIT_VOLT;
	191	if (is_ac)
	192	analog.mqflags \|= SR_MQFLAG_AC;
	193	if (is_dc)
	194	analog.mqflags \|= SR_MQFLAG_DC;
	195	}
	196	break;
	197	case 0x02:
	198	analog.mq = SR_MQ_CURRENT;
	199	analog.unit = SR_UNIT_AMPERE;
	200	if (is_ac)
	201	analog.mqflags \|= SR_MQFLAG_AC;
	202	if (is_dc)
	203	analog.mqflags \|= SR_MQFLAG_DC;
	204	break;
	205	case 0x04:
	206	if (is_continuity) {
	207	analog.mq = SR_MQ_CONTINUITY;
	208	analog.unit = SR_UNIT_BOOLEAN;
	209	fvalue = ivalue < 0 ? 0.0 : 1.0;
	210	} else {
	211	analog.mq = SR_MQ_RESISTANCE;
	212	analog.unit = SR_UNIT_OHM;
	213	if (ivalue < 0)
	214	fvalue = INFINITY;
	215	}
	216	break;
	217	case 0x08:
	218	/* Never seen */
fa773062	219	sr_dbg("Unknown measurement mode: 0x%.2x.", data[3]);
ff945683 BV	220	break;
	221	case 0x10:
	222	analog.mq = SR_MQ_FREQUENCY;
	223	analog.unit = SR_UNIT_HERTZ;
	224	break;
	225	case 0x20:
	226	analog.mq = SR_MQ_CAPACITANCE;
	227	analog.unit = SR_UNIT_FARAD;
	228	break;
	229	case 0x40:
	230	analog.mq = SR_MQ_TEMPERATURE;
	231	analog.unit = SR_UNIT_CELSIUS;
	232	break;
	233	case 0x80:
	234	analog.mq = SR_MQ_TEMPERATURE;
	235	analog.unit = SR_UNIT_FAHRENHEIT;
	236	break;
	237	default:
fa773062 UH	238	sr_dbg("Unknown/invalid measurement mode: 0x%.2x.", data[3]);
fa773062 UH	239	break;
ff945683 BV	240	}
	241	if (analog.mq == -1)
	242	return;
	243
	244	if (is_auto)
	245	analog.mqflags \|= SR_MQFLAG_AUTORANGE;
	246	if (is_hold)
	247	analog.mqflags \|= SR_MQFLAG_HOLD;
	248	if (is_max)
	249	analog.mqflags \|= SR_MQFLAG_MAX;
	250	if (is_min)
	251	analog.mqflags \|= SR_MQFLAG_MIN;
	252	if (is_relative)
	253	analog.mqflags \|= SR_MQFLAG_RELATIVE;
	254
ba7dd8bb	255	analog.channels = sdi->channels;
ff945683 BV	256	analog.num_samples = 1;
	257	analog.data = &fvalue;
	258	packet.type = SR_DF_ANALOG;
	259	packet.payload = &analog;
	260	sr_session_send(devc->cb_data, &packet);
	261
	262	devc->num_samples++;
	263	}
	264
	265	SR_PRIV int victor_dmm_receive_data(struct sr_dev_inst sdi, unsigned char buf)
ac3898d2	266	{
ff945683 BV	267	GString *dbg;
	268	int i;
	269	unsigned char data[DMM_DATA_SIZE];
	270	unsigned char obfuscation[DMM_DATA_SIZE] = "jodenxunickxia";
	271	unsigned char shuffle[DMM_DATA_SIZE] = {
	272	6, 13, 5, 11, 2, 7, 9, 8, 3, 10, 12, 0, 4, 1
	273	};
ac3898d2	274
ff945683 BV	275	for (i = 0; i < DMM_DATA_SIZE && buf[i] == 0; i++);
	276	if (i == DMM_DATA_SIZE) {
	277	/* This DMM outputs all zeroes from time to time, just ignore it. */
	278	sr_dbg("Received all zeroes.");
	279	return SR_OK;
	280	}
ac3898d2	281
ff945683 BV	282	/* Deobfuscate and reorder data. */
	283	for (i = 0; i < DMM_DATA_SIZE; i++)
	284	data[shuffle[i]] = (buf[i] - obfuscation[i]) & 0xff;
	285
	286	if (sr_log_loglevel_get() >= SR_LOG_SPEW) {
	287	dbg = g_string_sized_new(128);
	288	g_string_printf(dbg, "Deobfuscated.");
	289	for (i = 0; i < DMM_DATA_SIZE; i++)
	290	g_string_append_printf(dbg, " %.2x", data[i]);
	291	sr_spew("%s", dbg->str);
	292	g_string_free(dbg, TRUE);
ac3898d2 BV	293	}
ac3898d2 BV	294
69e19dd7	295	decode_buf(sdi, data);
ff945683 BV	296
ff945683 BV	297	return SR_OK;
ac3898d2	298	}