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

/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.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 <stdlib.h>
#include <math.h>
#include <string.h>
#include <errno.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
#include "protocol.h"

static gboolean lcd14_is_sync_valid(const struct lcd14_packet *packet)
{
	int i;
	uint8_t sync;

	/* Check the syncronization nibbles, and make sure they all match. */
	for (i = 0; i < LCD14_PACKET_SIZE; i++) {
		sync = (packet->raw[i] & LCD14_SYNC_MASK) >> 4;
		if (sync != (i + 1))
			return FALSE;
	}
	return TRUE;
}

static gboolean lcd14_is_selection_good(const struct lcd14_data *data)
{
	int n_postfix = 0, n_type = 0;

	/* Does the packet have more than one multiplier? */
	if (data->flags & LCD14_NANO)
		n_postfix++;
	if (data->flags & LCD14_MICRO)
		n_postfix++;
	if (data->flags & LCD14_MILLI)
		n_postfix++;
	if (data->flags & LCD14_KILO)
		n_postfix++;
	if (data->flags & LCD14_MEGA)
		n_postfix++;

	if (n_postfix > 1)
		return FALSE;

	/* Does the packet "measure" more than one type of value? */
	if (data->flags & LCD14_HZ)
		n_type++;
	if (data->flags & LCD14_OHM)
		n_type++;
	if (data->flags & LCD14_FARAD)
		n_type++;
	if (data->flags & LCD14_AMP)
		n_type++;
	if (data->flags & LCD14_VOLT)
		n_type++;
	if (data->flags & LCD14_DUTY)
		n_type++;
	if (data->flags & LCD14_CELSIUS)
		n_type++;
	/* Do not test for hFE. hFE is not implemented and always '1'. */
	if (n_type > 1)
		return FALSE;

	/* Both AC and DC? */
	if ((data->flags & LCD14_AC) && (data->flags & LCD14_DC))
		return FALSE;

	/* OK, no duplicates. */
	return TRUE;
}

/* We "cook" a raw lcd14_pcaket into a more pallatable form, lcd14_data. */
static void lcd14_cook_raw(const struct lcd14_packet *packet,
			   struct lcd14_data *data)
{
	int i, j;

	/* Get the digits out. */
	for (i = 0; i < 4; i++) {
		j = (i << 1) + 1;
		data->digit[i] = ((packet->raw[j] & ~LCD14_SYNC_MASK) << 4) |
				 ((packet->raw[j + 1] & ~LCD14_SYNC_MASK));
	}

	/* Now extract the flags. */
	data->flags = ((packet->raw[0]  & ~LCD14_SYNC_MASK) << 20) |
		      ((packet->raw[9]  & ~LCD14_SYNC_MASK) << 16) |
		      ((packet->raw[10] & ~LCD14_SYNC_MASK) << 12) |
		      ((packet->raw[11] & ~LCD14_SYNC_MASK) << 8) |
		      ((packet->raw[12] & ~LCD14_SYNC_MASK) << 4) |
		      ((packet->raw[13] & ~LCD14_SYNC_MASK));
}

/*
 * Since the DMM does not identify itself in any way shape, or form, we really
 * don't know for sure who is sending the data. We must use every possible
 * check to filter out bad packets, especially since the detection mechanism
 * depends on how well we can filter out bad packets packets.
 */
SR_PRIV gboolean lcd14_is_packet_valid(const struct lcd14_packet *packet,
				       struct lcd14_data *data)
{
	struct lcd14_data placeholder;

	/* Callers not interested in the data, pass NULL. */
	if (data == NULL)
		data = &placeholder;

	if (!lcd14_is_sync_valid(packet))
		return FALSE;

	lcd14_cook_raw(packet, data);

	if (!lcd14_is_selection_good(data))
		return FALSE;

	/* If we made it here, this looks to be a valid packet. */
	return TRUE;
}

static uint8_t lcd14_to_digit(uint8_t raw_digit)
{
	/* Take out the decimal point, so we can use a simple switch(). */
	raw_digit &= ~LCD14_DP_MASK;

	switch (raw_digit) {
	case 0x00:
	case LCD14_LCD_0:
		return 0;
	case LCD14_LCD_1:
		return 1;
	case LCD14_LCD_2:
		return 2;
	case LCD14_LCD_3:
		return 3;
	case LCD14_LCD_4:
		return 4;
	case LCD14_LCD_5:
		return 5;
	case LCD14_LCD_6:
		return 6;
	case LCD14_LCD_7:
		return 7;
	case LCD14_LCD_8:
		return 8;
	case LCD14_LCD_9:
		return 9;
	default:
		return LCD14_LCD_INVALID;
	}
}

/* Get a raw floating point value from the data. */
static double lcdraw_to_double(struct lcd14_data *data)
{
	double rawval;
	double multiplier = 1;
	uint8_t digit, raw_digit;
	gboolean dp_reached = FALSE;
	int i;

	/* We have 4 digits, and we start from the most significant. */
	for (i = 0; i < 4; i++) {
		raw_digit = data->digit[i];
		digit = lcd14_to_digit(raw_digit);
		if (digit == LCD14_LCD_INVALID) {
			rawval = NAN;
			break;
		}

		/*
		 * Digit 1 does not have a decimal point. Instead, the decimal
		 * point is used to indicate MAX, so we must avoid testing it.
		 */
		if ((i > 0) && (raw_digit & LCD14_DP_MASK))
			dp_reached = TRUE;
		if (dp_reached)
			multiplier /= 10;
		rawval = rawval * 10 + digit;
	}
	rawval *= multiplier;
	if (data->digit[0] & LCD14_D0_NEG)
		rawval *= -1;

	/* See if we need to multiply our raw value by anything. */
	if (data->flags & LCD14_NANO)
		rawval *= 1E-9;
	else if (data->flags & LCD14_MICRO)
		rawval *= 1E-6;
	else if (data->flags & LCD14_MILLI)
		rawval *= 1E-3;
	else if (data->flags & LCD14_KILO)
		rawval *= 1E3;
	else if (data->flags & LCD14_MEGA)
		rawval *= 1E6;

	return rawval;
}

/* Now see what the value means, and pass that on. */
static void lcd14_handle_packet(struct lcd14_data *data,
				struct dev_context *devc)
{
	double rawval;
	struct sr_datafeed_packet packet;
	struct sr_datafeed_analog *analog;

	if (!(analog = g_try_malloc0(sizeof(struct sr_datafeed_analog)))) {
		sr_err("Failed to malloc packet.");
		return;
	}

	if (!(analog->data = g_try_malloc(sizeof(float)))) {
		sr_err("Failed to malloc data.");
		g_free(analog);
		return;
	}

	rawval = lcdraw_to_double(data);

	analog->num_samples = 1;
	*analog->data = (float)rawval;

	analog->mq = -1;

	/* What does the data mean? */
	if (data->flags & LCD14_VOLT) {
		analog->mq = SR_MQ_VOLTAGE;
		analog->unit = SR_UNIT_VOLT;
		if (data->flags & LCD14_AC)
			analog->mqflags |= SR_MQFLAG_AC;
		else
			analog->mqflags |= SR_MQFLAG_DC;
	} else if (data->flags & LCD14_AMP) {
		analog->mq = SR_MQ_CURRENT;
		analog->unit = SR_UNIT_AMPERE;
		if (data->flags & LCD14_AC)
			analog->mqflags |= SR_MQFLAG_AC;
		else
			analog->mqflags |= SR_MQFLAG_DC;
	} else if (data->flags & LCD14_OHM) {
		if (data->flags & LCD14_BEEP)
			analog->mq = SR_MQ_CONTINUITY;
		else
			analog->mq = SR_MQ_RESISTANCE;
		if (!isnan(rawval))
			analog->unit = SR_UNIT_OHM;
		else {
			analog->unit = SR_UNIT_BOOLEAN;
			*analog->data = FALSE;
		}
	} else if (data->flags & LCD14_FARAD) {
		analog->mq = SR_MQ_CAPACITANCE;
		analog->unit = SR_UNIT_FARAD;
	} else if (data->flags & LCD14_CELSIUS) {
		analog->mq = SR_MQ_TEMPERATURE;
		/* No Kelvin or Fahrenheit from the device, just Celsius. */
		analog->unit = SR_UNIT_CELSIUS;
	} else if (data->flags & LCD14_HZ) {
		analog->mq = SR_MQ_FREQUENCY;
		analog->unit = SR_UNIT_HERTZ;
	} else if (data->flags & LCD14_DUTY) {
		analog->mq = SR_MQ_DUTY_CYCLE;
		analog->unit = SR_UNIT_PERCENTAGE;
	} else if (data->flags & LCD14_HFE) {
		analog->mq = SR_MQ_GAIN;
		analog->unit = SR_UNIT_UNITLESS;
	} else if (data->flags & LCD14_DIODE) {
		analog->mq = SR_MQ_VOLTAGE;
		analog->unit = SR_UNIT_VOLT;
		analog->mqflags |= SR_MQFLAG_DIODE | SR_MQFLAG_DC;
	} else {
		sr_warn("Unable to identify measurement mode.");
	}

	/* What other flags are associated with the data? */
	if (data->flags & LCD14_HOLD)
		analog->mqflags |= SR_MQFLAG_HOLD;
	if (data->flags & LCD14_AUTO)
		analog->mqflags |= SR_MQFLAG_AUTORANGE;
	if (data->flags & LCD14_REL)
		analog->mqflags |= SR_MQFLAG_RELATIVE;

	if (analog->mq != -1) {
		/* Got a measurement. */
		sr_spew("Measurement value is %f.", rawval);
		packet.type = SR_DF_ANALOG;
		packet.payload = analog;
		sr_session_send(devc->cb_data, &packet);
		devc->num_samples++;
	}

	g_free(analog->data);
	g_free(analog);
}

static void handle_new_data(struct dev_context *devc, int fd)
{
	int len, i, offset = 0;
	struct lcd14_packet *packet;
	struct lcd14_data data;

	/* Try to get as much data as the buffer can hold. */
	len = DMM_BUFSIZE - devc->buflen;
	len = serial_read(fd, devc->buf + devc->buflen, len);
	if (len < 1) {
		sr_err("Serial port read error: %d.", len);
		return;
	}
	devc->buflen += len;

	/* Now look for packets in that data. */
	while ((devc->buflen - offset) >= LCD14_PACKET_SIZE) {
		packet = (void *)(devc->buf + offset);
		if (lcd14_is_packet_valid(packet, &data)) {
			lcd14_handle_packet(&data, devc);
			offset += LCD14_PACKET_SIZE;
		} else {
			offset++;
		}
	}

	/* If we have any data left, move it to the beginning of our buffer. */
	for (i = 0; i < devc->buflen - offset; i++)
		devc->buf[i] = devc->buf[offset + i];
	devc->buflen -= offset;
}

SR_PRIV int tekpower_dmm_receive_data(int fd, int revents, void *cb_data)
{
	const struct sr_dev_inst *sdi;
	struct dev_context *devc;

	if (!(sdi = cb_data))
		return TRUE;

	if (!(devc = sdi->priv))
		return TRUE;

	if (revents == G_IO_IN) {
		/* Serial data arrived. */
		handle_new_data(devc, fd);
	}

	if (devc->num_samples >= devc->limit_samples) {
		sdi->driver->dev_acquisition_stop(sdi, cb_data);
		return TRUE;
	}

	return TRUE;
}
Commit	Line	Data
7dc55d93 AG	1	/*
	2	* This file is part of the sigrok project.
	3	*
	4	* Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.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
	20	#include <glib.h>
7dc55d93 AG	21	#include <stdlib.h>
	22	#include <math.h>
	23	#include <string.h>
	24	#include <errno.h>
bbabddbd UH	25	#include "libsigrok.h"
	26	#include "libsigrok-internal.h"
	27	#include "protocol.h"
7dc55d93	28
bbabddbd	29	static gboolean lcd14_is_sync_valid(const struct lcd14_packet *packet)
7dc55d93	30	{
bbabddbd UH	31	int i;
	32	uint8_t sync;
	33
	34	/* Check the syncronization nibbles, and make sure they all match. */
	35	for (i = 0; i < LCD14_PACKET_SIZE; i++) {
	36	sync = (packet->raw[i] & LCD14_SYNC_MASK) >> 4;
	37	if (sync != (i + 1))
7dc55d93 AG	38	return FALSE;
	39	}
	40	return TRUE;
	41	}
	42
bbabddbd	43	static gboolean lcd14_is_selection_good(const struct lcd14_data *data)
7dc55d93	44	{
bbabddbd UH	45	int n_postfix = 0, n_type = 0;
	46
	47	/* Does the packet have more than one multiplier? */
	48	if (data->flags & LCD14_NANO)
7dc55d93	49	n_postfix++;
bbabddbd	50	if (data->flags & LCD14_MICRO)
7dc55d93	51	n_postfix++;
bbabddbd	52	if (data->flags & LCD14_MILLI)
7dc55d93	53	n_postfix++;
bbabddbd	54	if (data->flags & LCD14_KILO)
7dc55d93	55	n_postfix++;
bbabddbd	56	if (data->flags & LCD14_MEGA)
7dc55d93 AG	57	n_postfix++;
7dc55d93 AG	58
bbabddbd	59	if (n_postfix > 1)
7dc55d93 AG	60	return FALSE;
7dc55d93 AG	61
bbabddbd UH	62	/* Does the packet "measure" more than one type of value? */
bbabddbd UH	63	if (data->flags & LCD14_HZ)
7dc55d93	64	n_type++;
bbabddbd	65	if (data->flags & LCD14_OHM)
7dc55d93	66	n_type++;
bbabddbd	67	if (data->flags & LCD14_FARAD)
7dc55d93	68	n_type++;
bbabddbd	69	if (data->flags & LCD14_AMP)
7dc55d93	70	n_type++;
bbabddbd	71	if (data->flags & LCD14_VOLT)
7dc55d93	72	n_type++;
bbabddbd	73	if (data->flags & LCD14_DUTY)
7dc55d93	74	n_type++;
bbabddbd	75	if (data->flags & LCD14_CELSIUS)
7dc55d93	76	n_type++;
bbabddbd UH	77	/* Do not test for hFE. hFE is not implemented and always '1'. */
bbabddbd UH	78	if (n_type > 1)
7dc55d93 AG	79	return FALSE;
7dc55d93 AG	80
bbabddbd UH	81	/* Both AC and DC? */
bbabddbd UH	82	if ((data->flags & LCD14_AC) && (data->flags & LCD14_DC))
7dc55d93 AG	83	return FALSE;
7dc55d93 AG	84
bbabddbd	85	/* OK, no duplicates. */
7dc55d93 AG	86	return TRUE;
	87	}
	88
bbabddbd UH	89	/* We "cook" a raw lcd14_pcaket into a more pallatable form, lcd14_data. */
	90	static void lcd14_cook_raw(const struct lcd14_packet *packet,
	91	struct lcd14_data *data)
7dc55d93	92	{
bbabddbd UH	93	int i, j;
	94
	95	/* Get the digits out. */
	96	for (i = 0; i < 4; i++) {
	97	j = (i << 1) + 1;
	98	data->digit[i] = ((packet->raw[j] & ~LCD14_SYNC_MASK) << 4) \|
	99	((packet->raw[j + 1] & ~LCD14_SYNC_MASK));
7dc55d93 AG	100	}
7dc55d93 AG	101
bbabddbd UH	102	/* Now extract the flags. */
	103	data->flags = ((packet->raw[0] & ~LCD14_SYNC_MASK) << 20) \|
	104	((packet->raw[9] & ~LCD14_SYNC_MASK) << 16) \|
	105	((packet->raw[10] & ~LCD14_SYNC_MASK) << 12) \|
	106	((packet->raw[11] & ~LCD14_SYNC_MASK) << 8) \|
	107	((packet->raw[12] & ~LCD14_SYNC_MASK) << 4) \|
	108	((packet->raw[13] & ~LCD14_SYNC_MASK));
7dc55d93 AG	109	}
7dc55d93 AG	110
bbabddbd UH	111	/*
bbabddbd UH	112	* Since the DMM does not identify itself in any way shape, or form, we really
7dc55d93	113	* don't know for sure who is sending the data. We must use every possible
bbabddbd UH	114	* check to filter out bad packets, especially since the detection mechanism
	115	* depends on how well we can filter out bad packets packets.
	116	*/
	117	SR_PRIV gboolean lcd14_is_packet_valid(const struct lcd14_packet *packet,
	118	struct lcd14_data *data)
7dc55d93	119	{
bbabddbd UH	120	struct lcd14_data placeholder;
	121
	122	/* Callers not interested in the data, pass NULL. */
	123	if (data == NULL)
7dc55d93	124	data = &placeholder;
bbabddbd UH	125
bbabddbd UH	126	if (!lcd14_is_sync_valid(packet))
7dc55d93 AG	127	return FALSE;
	128
	129	lcd14_cook_raw(packet, data);
	130
bbabddbd	131	if (!lcd14_is_selection_good(data))
7dc55d93 AG	132	return FALSE;
7dc55d93 AG	133
bbabddbd	134	/* If we made it here, this looks to be a valid packet. */
7dc55d93 AG	135	return TRUE;
	136	}
	137
	138	static uint8_t lcd14_to_digit(uint8_t raw_digit)
	139	{
bbabddbd	140	/* Take out the decimal point, so we can use a simple switch(). */
7dc55d93	141	raw_digit &= ~LCD14_DP_MASK;
bbabddbd UH	142
bbabddbd UH	143	switch (raw_digit) {
7dc55d93 AG	144	case 0x00:
	145	case LCD14_LCD_0:
	146	return 0;
	147	case LCD14_LCD_1:
	148	return 1;
	149	case LCD14_LCD_2:
	150	return 2;
	151	case LCD14_LCD_3:
	152	return 3;
	153	case LCD14_LCD_4:
	154	return 4;
	155	case LCD14_LCD_5:
	156	return 5;
	157	case LCD14_LCD_6:
	158	return 6;
	159	case LCD14_LCD_7:
	160	return 7;
	161	case LCD14_LCD_8:
	162	return 8;
	163	case LCD14_LCD_9:
	164	return 9;
	165	default:
	166	return LCD14_LCD_INVALID;
	167	}
	168	}
	169
bbabddbd UH	170	/* Get a raw floating point value from the data. */
bbabddbd UH	171	static double lcdraw_to_double(struct lcd14_data *data)
7dc55d93	172	{
7dc55d93 AG	173	double rawval;
7dc55d93 AG	174	double multiplier = 1;
bbabddbd	175	uint8_t digit, raw_digit;
7dc55d93 AG	176	gboolean dp_reached = FALSE;
	177	int i;
	178
bbabddbd UH	179	/* We have 4 digits, and we start from the most significant. */
	180	for (i = 0; i < 4; i++) {
	181	raw_digit = data->digit[i];
7dc55d93	182	digit = lcd14_to_digit(raw_digit);
bbabddbd	183	if (digit == LCD14_LCD_INVALID) {
7dc55d93 AG	184	rawval = NAN;
	185	break;
	186	}
bbabddbd UH	187
	188	/*
	189	* Digit 1 does not have a decimal point. Instead, the decimal
	190	* point is used to indicate MAX, so we must avoid testing it.
	191	*/
	192	if ((i > 0) && (raw_digit & LCD14_DP_MASK))
7dc55d93	193	dp_reached = TRUE;
bbabddbd UH	194	if (dp_reached)
bbabddbd UH	195	multiplier /= 10;
7dc55d93 AG	196	rawval = rawval * 10 + digit;
	197	}
	198	rawval *= multiplier;
bbabddbd	199	if (data->digit[0] & LCD14_D0_NEG)
7dc55d93 AG	200	rawval *= -1;
7dc55d93 AG	201
bbabddbd UH	202	/* See if we need to multiply our raw value by anything. */
bbabddbd UH	203	if (data->flags & LCD14_NANO)
7dc55d93	204	rawval *= 1E-9;
bbabddbd	205	else if (data->flags & LCD14_MICRO)
7dc55d93	206	rawval *= 1E-6;
bbabddbd	207	else if (data->flags & LCD14_MILLI)
7dc55d93	208	rawval *= 1E-3;
bbabddbd	209	else if (data->flags & LCD14_KILO)
7dc55d93	210	rawval *= 1E3;
bbabddbd	211	else if (data->flags & LCD14_MEGA)
7dc55d93	212	rawval *= 1E6;
7dc55d93 AG	213
	214	return rawval;
	215	}
	216
bbabddbd UH	217	/* Now see what the value means, and pass that on. */
	218	static void lcd14_handle_packet(struct lcd14_data *data,
	219	struct dev_context *devc)
7dc55d93	220	{
bbabddbd	221	double rawval;
7dc55d93 AG	222	struct sr_datafeed_packet packet;
	223	struct sr_datafeed_analog *analog;
	224
bbabddbd UH	225	if (!(analog = g_try_malloc0(sizeof(struct sr_datafeed_analog)))) {
bbabddbd UH	226	sr_err("Failed to malloc packet.");
7dc55d93 AG	227	return;
7dc55d93 AG	228	}
bbabddbd UH	229
	230	if (!(analog->data = g_try_malloc(sizeof(float)))) {
	231	sr_err("Failed to malloc data.");
7dc55d93 AG	232	g_free(analog);
	233	return;
	234	}
bbabddbd UH	235
	236	rawval = lcdraw_to_double(data);
	237
	238	analog->num_samples = 1;
7dc55d93	239	*analog->data = (float)rawval;
bbabddbd	240
7dc55d93 AG	241	analog->mq = -1;
7dc55d93 AG	242
bbabddbd UH	243	/* What does the data mean? */
bbabddbd UH	244	if (data->flags & LCD14_VOLT) {
7dc55d93 AG	245	analog->mq = SR_MQ_VOLTAGE;
7dc55d93 AG	246	analog->unit = SR_UNIT_VOLT;
bbabddbd	247	if (data->flags & LCD14_AC)
7dc55d93 AG	248	analog->mqflags \|= SR_MQFLAG_AC;
	249	else
	250	analog->mqflags \|= SR_MQFLAG_DC;
bbabddbd	251	} else if (data->flags & LCD14_AMP) {
7dc55d93 AG	252	analog->mq = SR_MQ_CURRENT;
7dc55d93 AG	253	analog->unit = SR_UNIT_AMPERE;
bbabddbd	254	if (data->flags & LCD14_AC)
7dc55d93 AG	255	analog->mqflags \|= SR_MQFLAG_AC;
	256	else
	257	analog->mqflags \|= SR_MQFLAG_DC;
bbabddbd UH	258	} else if (data->flags & LCD14_OHM) {
bbabddbd UH	259	if (data->flags & LCD14_BEEP)
7dc55d93 AG	260	analog->mq = SR_MQ_CONTINUITY;
	261	else
	262	analog->mq = SR_MQ_RESISTANCE;
bbabddbd	263	if (!isnan(rawval))
7dc55d93 AG	264	analog->unit = SR_UNIT_OHM;
	265	else {
	266	analog->unit = SR_UNIT_BOOLEAN;
	267	*analog->data = FALSE;
	268	}
bbabddbd	269	} else if (data->flags & LCD14_FARAD) {
7dc55d93 AG	270	analog->mq = SR_MQ_CAPACITANCE;
7dc55d93 AG	271	analog->unit = SR_UNIT_FARAD;
bbabddbd	272	} else if (data->flags & LCD14_CELSIUS) {
7dc55d93	273	analog->mq = SR_MQ_TEMPERATURE;
bbabddbd	274	/* No Kelvin or Fahrenheit from the device, just Celsius. */
7dc55d93	275	analog->unit = SR_UNIT_CELSIUS;
bbabddbd	276	} else if (data->flags & LCD14_HZ) {
7dc55d93 AG	277	analog->mq = SR_MQ_FREQUENCY;
7dc55d93 AG	278	analog->unit = SR_UNIT_HERTZ;
bbabddbd	279	} else if (data->flags & LCD14_DUTY) {
7dc55d93 AG	280	analog->mq = SR_MQ_DUTY_CYCLE;
7dc55d93 AG	281	analog->unit = SR_UNIT_PERCENTAGE;
bbabddbd	282	} else if (data->flags & LCD14_HFE) {
7dc55d93 AG	283	analog->mq = SR_MQ_GAIN;
7dc55d93 AG	284	analog->unit = SR_UNIT_UNITLESS;
bbabddbd	285	} else if (data->flags & LCD14_DIODE) {
7dc55d93 AG	286	analog->mq = SR_MQ_VOLTAGE;
	287	analog->unit = SR_UNIT_VOLT;
	288	analog->mqflags \|= SR_MQFLAG_DIODE \| SR_MQFLAG_DC;
bbabddbd UH	289	} else {
bbabddbd UH	290	sr_warn("Unable to identify measurement mode.");
7dc55d93 AG	291	}
	292
	293	/* What other flags are associated with the data? */
bbabddbd	294	if (data->flags & LCD14_HOLD)
7dc55d93	295	analog->mqflags \|= SR_MQFLAG_HOLD;
bbabddbd	296	if (data->flags & LCD14_AUTO)
7dc55d93	297	analog->mqflags \|= SR_MQFLAG_AUTORANGE;
bbabddbd	298	if (data->flags & LCD14_REL)
7dc55d93	299	analog->mqflags \|= SR_MQFLAG_RELATIVE;
7dc55d93 AG	300
	301	if (analog->mq != -1) {
	302	/* Got a measurement. */
bbabddbd	303	sr_spew("Measurement value is %f.", rawval);
7dc55d93 AG	304	packet.type = SR_DF_ANALOG;
	305	packet.payload = analog;
	306	sr_session_send(devc->cb_data, &packet);
	307	devc->num_samples++;
	308	}
bbabddbd	309
7dc55d93 AG	310	g_free(analog->data);
	311	g_free(analog);
	312	}
	313
	314	static void handle_new_data(struct dev_context *devc, int fd)
	315	{
bbabddbd UH	316	int len, i, offset = 0;
	317	struct lcd14_packet *packet;
	318	struct lcd14_data data;
	319
	320	/* Try to get as much data as the buffer can hold. */
7dc55d93 AG	321	len = DMM_BUFSIZE - devc->buflen;
	322	len = serial_read(fd, devc->buf + devc->buflen, len);
	323	if (len < 1) {
bbabddbd	324	sr_err("Serial port read error: %d.", len);
7dc55d93 AG	325	return;
	326	}
	327	devc->buflen += len;
	328
bbabddbd UH	329	/* Now look for packets in that data. */
	330	while ((devc->buflen - offset) >= LCD14_PACKET_SIZE) {
	331	packet = (void *)(devc->buf + offset);
	332	if (lcd14_is_packet_valid(packet, &data)) {
7dc55d93 AG	333	lcd14_handle_packet(&data, devc);
	334	offset += LCD14_PACKET_SIZE;
	335	} else {
	336	offset++;
	337	}
	338	}
	339
bbabddbd UH	340	/* If we have any data left, move it to the beginning of our buffer. */
bbabddbd UH	341	for (i = 0; i < devc->buflen - offset; i++)
7dc55d93 AG	342	devc->buf[i] = devc->buf[offset + i];
	343	devc->buflen -= offset;
	344	}
	345
bbabddbd	346	SR_PRIV int tekpower_dmm_receive_data(int fd, int revents, void *cb_data)
7dc55d93 AG	347	{
	348	const struct sr_dev_inst *sdi;
	349	struct dev_context *devc;
	350
	351	if (!(sdi = cb_data))
	352	return TRUE;
	353
	354	if (!(devc = sdi->priv))
	355	return TRUE;
	356
bbabddbd	357	if (revents == G_IO_IN) {
7dc55d93 AG	358	/* Serial data arrived. */
	359	handle_new_data(devc, fd);
	360	}
	361
	362	if (devc->num_samples >= devc->limit_samples) {
	363	sdi->driver->dev_acquisition_stop(sdi, cb_data);
	364	return TRUE;
	365	}
	366
	367	return TRUE;
	368	}