[libsigrok.git] / src / hardware / korad-kaxxxxp / protocol.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2015 Hannu Vuolasaho <vuokkosetae@gmail.com>
 * Copyright (C) 2018 Frank Stettner <frank-stettner@gmx.net>
 *
 * 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 <config.h>
#include "protocol.h"

#define REQ_TIMEOUT_MS 500
#define DEVICE_PROCESSING_TIME_MS 80

SR_PRIV int korad_kaxxxxp_send_cmd(struct sr_serial_dev_inst *serial,
				const char *cmd)
{
	int ret;

	sr_dbg("Sending '%s'.", cmd);
	if ((ret = serial_write_blocking(serial, cmd, strlen(cmd), 0)) < 0) {
		sr_err("Error sending command: %d.", ret);
		return ret;
	}

	return ret;
}

SR_PRIV int korad_kaxxxxp_read_chars(struct sr_serial_dev_inst *serial,
				int count, char *buf)
{
	int ret, received, turns;

	received = 0;
	turns = 0;

	do {
		if ((ret = serial_read_blocking(serial, buf + received,
				count - received,
				serial_timeout(serial, count))) < 0) {
			sr_err("Error %d reading %d bytes from device.",
			       ret, count);
			return ret;
		}
		received += ret;
		turns++;
	} while ((received < count) && (turns < 100));

	buf[count] = 0;

	sr_spew("Received: '%s'.", buf);

	return ret;
}

static void give_device_time_to_process(struct dev_context *devc)
{
	int64_t sleeping_time;

	sleeping_time = devc->req_sent_at + (DEVICE_PROCESSING_TIME_MS * 1000);
	sleeping_time -= g_get_monotonic_time();

	if (sleeping_time > 0) {
		g_usleep(sleeping_time);
		sr_spew("Sleeping for processing %" PRIi64 " usec", sleeping_time);
	}
}

SR_PRIV int korad_kaxxxxp_set_value(struct sr_serial_dev_inst *serial,
				int target, struct dev_context *devc)
{
	char msg[21];
	const char *cmd;
	float value;
	int ret;

	g_mutex_lock(&devc->rw_mutex);
	give_device_time_to_process(devc);

	msg[20] = 0;
	switch (target) {
	case KAXXXXP_CURRENT:
	case KAXXXXP_VOLTAGE:
	case KAXXXXP_STATUS:
		sr_err("Can't set measurable parameter %d.", target);
		g_mutex_unlock(&devc->rw_mutex);
		return SR_ERR;
	case KAXXXXP_CURRENT_MAX:
		cmd = "ISET1:%05.3f";
		value = devc->current_max;
		break;
	case KAXXXXP_VOLTAGE_MAX:
		cmd = "VSET1:%05.2f";
		value = devc->voltage_max;
		break;
	case KAXXXXP_OUTPUT:
		cmd = "OUT%01.0f";
		value = (devc->output_enabled) ? 1 : 0;
		break;
	case KAXXXXP_BEEP:
		cmd = "BEEP%01.0f";
		value = (devc->beep_enabled) ? 1 : 0;
		break;
	case KAXXXXP_OCP:
		cmd = "OCP%01.0f";
		value = (devc->ocp_enabled) ? 1 : 0;
		break;
	case KAXXXXP_OVP:
		cmd = "OVP%01.0f";
		value = (devc->ovp_enabled) ? 1 : 0;
		break;
	case KAXXXXP_SAVE:
		cmd = "SAV%01.0f";
		if (devc->program < 1 || devc->program > 5) {
			sr_err("Only programs 1-5 supported and %d isn't "
			       "between them.", devc->program);
			g_mutex_unlock(&devc->rw_mutex);
			return SR_ERR;
		}
		value = devc->program;
		break;
	case KAXXXXP_RECALL:
		cmd = "RCL%01.0f";
		if (devc->program < 1 || devc->program > 5) {
			sr_err("Only programs 1-5 supported and %d isn't "
			       "between them.", devc->program);
			g_mutex_unlock(&devc->rw_mutex);
			return SR_ERR;
		}
		value = devc->program;
		break;
	default:
		sr_err("Don't know how to set %d.", target);
		g_mutex_unlock(&devc->rw_mutex);
		return SR_ERR;
	}

	if (cmd)
		snprintf(msg, 20, cmd, value);

	ret = korad_kaxxxxp_send_cmd(serial, msg);
	devc->req_sent_at = g_get_monotonic_time();

	g_mutex_unlock(&devc->rw_mutex);

	return ret;
}

SR_PRIV int korad_kaxxxxp_get_value(struct sr_serial_dev_inst *serial,
				int target, struct dev_context *devc)
{
	int ret, count;
	char reply[6];
	float *value;
	char status_byte;

	g_mutex_lock(&devc->rw_mutex);
	give_device_time_to_process(devc);

	value = NULL;
	count = 5;

	switch (target) {
	case KAXXXXP_CURRENT:
		/* Read current from device. */
		ret = korad_kaxxxxp_send_cmd(serial, "IOUT1?");
		value = &(devc->current);
		break;
	case KAXXXXP_CURRENT_MAX:
		/* Read set current from device. */
		ret = korad_kaxxxxp_send_cmd(serial, "ISET1?");
		value = &(devc->current_max);
		break;
	case KAXXXXP_VOLTAGE:
		/* Read voltage from device. */
		ret = korad_kaxxxxp_send_cmd(serial, "VOUT1?");
		value = &(devc->voltage);
		break;
	case KAXXXXP_VOLTAGE_MAX:
		/* Read set voltage from device. */
		ret = korad_kaxxxxp_send_cmd(serial, "VSET1?");
		value = &(devc->voltage_max);
		break;
	case KAXXXXP_STATUS:
	case KAXXXXP_OUTPUT:
	case KAXXXXP_OCP:
	case KAXXXXP_OVP:
		/* Read status from device. */
		ret = korad_kaxxxxp_send_cmd(serial, "STATUS?");
		count = 1;
		break;
	default:
		sr_err("Don't know how to query %d.", target);
		g_mutex_unlock(&devc->rw_mutex);
		return SR_ERR;
	}

	devc->req_sent_at = g_get_monotonic_time();

	if ((ret = korad_kaxxxxp_read_chars(serial, count, reply)) < 0) {
		g_mutex_unlock(&devc->rw_mutex);
		return ret;
	}

	reply[count] = 0;

	if (value) {
		sr_atof_ascii((const char *)&reply, value);
		sr_dbg("value: %f", *value);
	} else {
		/* We have status reply. */
		status_byte = reply[0];
		/* Constant current */
		devc->cc_mode[0] = !(status_byte & (1 << 0)); /* Channel one */
		devc->cc_mode[1] = !(status_byte & (1 << 1)); /* Channel two */
		/*
		 * Tracking
		 * status_byte & ((1 << 2) | (1 << 3))
		 * 00 independent 01 series 11 parallel
		 */
		devc->beep_enabled = (1 << 4);
		devc->ocp_enabled = (status_byte & (1 << 5));
		devc->output_enabled = (status_byte & (1 << 6));
		/* Velleman LABPS3005 quirk */
		if (devc->output_enabled)
			devc->ovp_enabled = (status_byte & (1 << 7));
		sr_dbg("Status: 0x%02x", status_byte);
		sr_spew("Status: CH1: constant %s CH2: constant %s. "
			"Tracking would be %s. Device is "
			"%s and %s. Buttons are %s. Output is %s "
			"and extra byte is %s.",
			(status_byte & (1 << 0)) ? "voltage" : "current",
			(status_byte & (1 << 1)) ? "voltage" : "current",
			(status_byte & (1 << 2)) ? "parallel" : "series",
			(status_byte & (1 << 3)) ? "tracking" : "independent",
			(status_byte & (1 << 4)) ? "beeping" : "silent",
			(status_byte & (1 << 5)) ? "locked" : "unlocked",
			(status_byte & (1 << 6)) ? "enabled" : "disabled",
			(status_byte & (1 << 7)) ? "true" : "false");
	}

	/* Read the sixth byte from ISET? BUG workaround. */
	if (target == KAXXXXP_CURRENT_MAX)
		serial_read_blocking(serial, &status_byte, 1, 10);

	g_mutex_unlock(&devc->rw_mutex);

	return ret;
}

SR_PRIV int korad_kaxxxxp_get_all_values(struct sr_serial_dev_inst *serial,
				struct dev_context *devc)
{
	int ret, target;

	for (target = KAXXXXP_CURRENT;
			target <= KAXXXXP_STATUS; target++) {
		if ((ret = korad_kaxxxxp_get_value(serial, target, devc)) < 0)
			return ret;
	}

	return ret;
}

static void next_measurement(struct dev_context *devc)
{
	switch (devc->acquisition_target) {
	case KAXXXXP_CURRENT:
		devc->acquisition_target = KAXXXXP_VOLTAGE;
		break;
	case KAXXXXP_VOLTAGE:
		devc->acquisition_target = KAXXXXP_STATUS;
		break;
	case KAXXXXP_STATUS:
		devc->acquisition_target = KAXXXXP_CURRENT;
		break;
	default:
		devc->acquisition_target = KAXXXXP_CURRENT;
		sr_err("Invalid target for next acquisition.");
	}
}

SR_PRIV int korad_kaxxxxp_receive_data(int fd, int revents, void *cb_data)
{
	struct sr_dev_inst *sdi;
	struct dev_context *devc;
	struct sr_serial_dev_inst *serial;
	struct sr_datafeed_packet packet;
	struct sr_datafeed_analog analog;
	struct sr_analog_encoding encoding;
	struct sr_analog_meaning meaning;
	struct sr_analog_spec spec;
	GSList *l;

	(void)fd;

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

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

	serial = sdi->conn;

	if (revents == G_IO_IN) {
		/* Get the value. */
		korad_kaxxxxp_get_value(serial, devc->acquisition_target, devc);

		/* Note: digits/spec_digits will be overridden later. */
		sr_analog_init(&analog, &encoding, &meaning, &spec, 0);

		/* Send the value forward. */
		packet.type = SR_DF_ANALOG;
		packet.payload = &analog;
		analog.num_samples = 1;
		l = g_slist_copy(sdi->channels);
		if (devc->acquisition_target == KAXXXXP_CURRENT) {
			l = g_slist_remove_link(l, g_slist_nth(l, 0));
			analog.meaning->channels = l;
			analog.meaning->mq = SR_MQ_CURRENT;
			analog.meaning->unit = SR_UNIT_AMPERE;
			analog.meaning->mqflags = 0;
			analog.encoding->digits = 3;
			analog.spec->spec_digits = 3;
			analog.data = &devc->current;
			sr_session_send(sdi, &packet);
		}
		else if (devc->acquisition_target == KAXXXXP_VOLTAGE) {
			l = g_slist_remove_link(l, g_slist_nth(l, 1));
			analog.meaning->channels = l;
			analog.meaning->mq = SR_MQ_VOLTAGE;
			analog.meaning->unit = SR_UNIT_VOLT;
			analog.meaning->mqflags = SR_MQFLAG_DC;
			analog.encoding->digits = 2;
			analog.spec->spec_digits = 2;
			analog.data = &devc->voltage;
			sr_session_send(sdi, &packet);
			sr_sw_limits_update_samples_read(&devc->limits, 1);
		}
		next_measurement(devc);
	}

	if (sr_sw_limits_check(&devc->limits))
		sr_dev_acquisition_stop(sdi);

	return TRUE;
}
Commit	Line	Data
	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2015 Hannu Vuolasaho <vuokkosetae@gmail.com>
	5	* Copyright (C) 2018 Frank Stettner <frank-stettner@gmx.net>
	6	*
	7	* This program is free software: you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation, either version 3 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	19	*/
	20
	21	#include <config.h>
	22	#include "protocol.h"
	23
	24	#define REQ_TIMEOUT_MS 500
	25	#define DEVICE_PROCESSING_TIME_MS 80
	26
	27	SR_PRIV int korad_kaxxxxp_send_cmd(struct sr_serial_dev_inst *serial,
	28	const char *cmd)
	29	{
	30	int ret;
	31
	32	sr_dbg("Sending '%s'.", cmd);
	33	if ((ret = serial_write_blocking(serial, cmd, strlen(cmd), 0)) < 0) {
	34	sr_err("Error sending command: %d.", ret);
	35	return ret;
	36	}
	37
	38	return ret;
	39	}
	40
	41	SR_PRIV int korad_kaxxxxp_read_chars(struct sr_serial_dev_inst *serial,
	42	int count, char *buf)
	43	{
	44	int ret, received, turns;
	45
	46	received = 0;
	47	turns = 0;
	48
	49	do {
	50	if ((ret = serial_read_blocking(serial, buf + received,
	51	count - received,
	52	serial_timeout(serial, count))) < 0) {
	53	sr_err("Error %d reading %d bytes from device.",
	54	ret, count);
	55	return ret;
	56	}
	57	received += ret;
	58	turns++;
	59	} while ((received < count) && (turns < 100));
	60
	61	buf[count] = 0;
	62
	63	sr_spew("Received: '%s'.", buf);
	64
	65	return ret;
	66	}
	67
	68	static void give_device_time_to_process(struct dev_context *devc)
	69	{
	70	int64_t sleeping_time;
	71
	72	sleeping_time = devc->req_sent_at + (DEVICE_PROCESSING_TIME_MS * 1000);
	73	sleeping_time -= g_get_monotonic_time();
	74
	75	if (sleeping_time > 0) {
	76	g_usleep(sleeping_time);
	77	sr_spew("Sleeping for processing %" PRIi64 " usec", sleeping_time);
	78	}
	79	}
	80
	81	SR_PRIV int korad_kaxxxxp_set_value(struct sr_serial_dev_inst *serial,
	82	int target, struct dev_context *devc)
	83	{
	84	char msg[21];
	85	const char *cmd;
	86	float value;
	87	int ret;
	88
	89	g_mutex_lock(&devc->rw_mutex);
	90	give_device_time_to_process(devc);
	91
	92	msg[20] = 0;
	93	switch (target) {
	94	case KAXXXXP_CURRENT:
	95	case KAXXXXP_VOLTAGE:
	96	case KAXXXXP_STATUS:
	97	sr_err("Can't set measurable parameter %d.", target);
	98	g_mutex_unlock(&devc->rw_mutex);
	99	return SR_ERR;
	100	case KAXXXXP_CURRENT_MAX:
	101	cmd = "ISET1:%05.3f";
	102	value = devc->current_max;
	103	break;
	104	case KAXXXXP_VOLTAGE_MAX:
	105	cmd = "VSET1:%05.2f";
	106	value = devc->voltage_max;
	107	break;
	108	case KAXXXXP_OUTPUT:
	109	cmd = "OUT%01.0f";
	110	value = (devc->output_enabled) ? 1 : 0;
	111	break;
	112	case KAXXXXP_BEEP:
	113	cmd = "BEEP%01.0f";
	114	value = (devc->beep_enabled) ? 1 : 0;
	115	break;
	116	case KAXXXXP_OCP:
	117	cmd = "OCP%01.0f";
	118	value = (devc->ocp_enabled) ? 1 : 0;
	119	break;
	120	case KAXXXXP_OVP:
	121	cmd = "OVP%01.0f";
	122	value = (devc->ovp_enabled) ? 1 : 0;
	123	break;
	124	case KAXXXXP_SAVE:
	125	cmd = "SAV%01.0f";
	126	if (devc->program < 1 \|\| devc->program > 5) {
	127	sr_err("Only programs 1-5 supported and %d isn't "
	128	"between them.", devc->program);
	129	g_mutex_unlock(&devc->rw_mutex);
	130	return SR_ERR;
	131	}
	132	value = devc->program;
	133	break;
	134	case KAXXXXP_RECALL:
	135	cmd = "RCL%01.0f";
	136	if (devc->program < 1 \|\| devc->program > 5) {
	137	sr_err("Only programs 1-5 supported and %d isn't "
	138	"between them.", devc->program);
	139	g_mutex_unlock(&devc->rw_mutex);
	140	return SR_ERR;
	141	}
	142	value = devc->program;
	143	break;
	144	default:
	145	sr_err("Don't know how to set %d.", target);
	146	g_mutex_unlock(&devc->rw_mutex);
	147	return SR_ERR;
	148	}
	149
	150	if (cmd)
	151	snprintf(msg, 20, cmd, value);
	152
	153	ret = korad_kaxxxxp_send_cmd(serial, msg);
	154	devc->req_sent_at = g_get_monotonic_time();
	155
	156	g_mutex_unlock(&devc->rw_mutex);
	157
	158	return ret;
	159	}
	160
	161	SR_PRIV int korad_kaxxxxp_get_value(struct sr_serial_dev_inst *serial,
	162	int target, struct dev_context *devc)
	163	{
	164	int ret, count;
	165	char reply[6];
	166	float *value;
	167	char status_byte;
	168
	169	g_mutex_lock(&devc->rw_mutex);
	170	give_device_time_to_process(devc);
	171
	172	value = NULL;
	173	count = 5;
	174
	175	switch (target) {
	176	case KAXXXXP_CURRENT:
	177	/* Read current from device. */
	178	ret = korad_kaxxxxp_send_cmd(serial, "IOUT1?");
	179	value = &(devc->current);
	180	break;
	181	case KAXXXXP_CURRENT_MAX:
	182	/* Read set current from device. */
	183	ret = korad_kaxxxxp_send_cmd(serial, "ISET1?");
	184	value = &(devc->current_max);
	185	break;
	186	case KAXXXXP_VOLTAGE:
	187	/* Read voltage from device. */
	188	ret = korad_kaxxxxp_send_cmd(serial, "VOUT1?");
	189	value = &(devc->voltage);
	190	break;
	191	case KAXXXXP_VOLTAGE_MAX:
	192	/* Read set voltage from device. */
	193	ret = korad_kaxxxxp_send_cmd(serial, "VSET1?");
	194	value = &(devc->voltage_max);
	195	break;
	196	case KAXXXXP_STATUS:
	197	case KAXXXXP_OUTPUT:
	198	case KAXXXXP_OCP:
	199	case KAXXXXP_OVP:
	200	/* Read status from device. */
	201	ret = korad_kaxxxxp_send_cmd(serial, "STATUS?");
	202	count = 1;
	203	break;
	204	default:
	205	sr_err("Don't know how to query %d.", target);
	206	g_mutex_unlock(&devc->rw_mutex);
	207	return SR_ERR;
	208	}
	209
	210	devc->req_sent_at = g_get_monotonic_time();
	211
	212	if ((ret = korad_kaxxxxp_read_chars(serial, count, reply)) < 0) {
	213	g_mutex_unlock(&devc->rw_mutex);
	214	return ret;
	215	}
	216
	217	reply[count] = 0;
	218
	219	if (value) {
	220	sr_atof_ascii((const char *)&reply, value);
	221	sr_dbg("value: %f", *value);
	222	} else {
	223	/* We have status reply. */
	224	status_byte = reply[0];
	225	/* Constant current */
	226	devc->cc_mode[0] = !(status_byte & (1 << 0)); /* Channel one */
	227	devc->cc_mode[1] = !(status_byte & (1 << 1)); /* Channel two */
	228	/*
	229	* Tracking
	230	* status_byte & ((1 << 2) \| (1 << 3))
	231	* 00 independent 01 series 11 parallel
	232	*/
	233	devc->beep_enabled = (1 << 4);
	234	devc->ocp_enabled = (status_byte & (1 << 5));
	235	devc->output_enabled = (status_byte & (1 << 6));
	236	/* Velleman LABPS3005 quirk */
	237	if (devc->output_enabled)
	238	devc->ovp_enabled = (status_byte & (1 << 7));
	239	sr_dbg("Status: 0x%02x", status_byte);
	240	sr_spew("Status: CH1: constant %s CH2: constant %s. "
	241	"Tracking would be %s. Device is "
	242	"%s and %s. Buttons are %s. Output is %s "
	243	"and extra byte is %s.",
	244	(status_byte & (1 << 0)) ? "voltage" : "current",
	245	(status_byte & (1 << 1)) ? "voltage" : "current",
	246	(status_byte & (1 << 2)) ? "parallel" : "series",
	247	(status_byte & (1 << 3)) ? "tracking" : "independent",
	248	(status_byte & (1 << 4)) ? "beeping" : "silent",
	249	(status_byte & (1 << 5)) ? "locked" : "unlocked",
	250	(status_byte & (1 << 6)) ? "enabled" : "disabled",
	251	(status_byte & (1 << 7)) ? "true" : "false");
	252	}
	253
	254	/* Read the sixth byte from ISET? BUG workaround. */
	255	if (target == KAXXXXP_CURRENT_MAX)
	256	serial_read_blocking(serial, &status_byte, 1, 10);
	257
	258	g_mutex_unlock(&devc->rw_mutex);
	259
	260	return ret;
	261	}
	262
	263	SR_PRIV int korad_kaxxxxp_get_all_values(struct sr_serial_dev_inst *serial,
	264	struct dev_context *devc)
	265	{
	266	int ret, target;
	267
	268	for (target = KAXXXXP_CURRENT;
	269	target <= KAXXXXP_STATUS; target++) {
	270	if ((ret = korad_kaxxxxp_get_value(serial, target, devc)) < 0)
	271	return ret;
	272	}
	273
	274	return ret;
	275	}
	276
	277	static void next_measurement(struct dev_context *devc)
	278	{
	279	switch (devc->acquisition_target) {
	280	case KAXXXXP_CURRENT:
	281	devc->acquisition_target = KAXXXXP_VOLTAGE;
	282	break;
	283	case KAXXXXP_VOLTAGE:
	284	devc->acquisition_target = KAXXXXP_STATUS;
	285	break;
	286	case KAXXXXP_STATUS:
	287	devc->acquisition_target = KAXXXXP_CURRENT;
	288	break;
	289	default:
	290	devc->acquisition_target = KAXXXXP_CURRENT;
	291	sr_err("Invalid target for next acquisition.");
	292	}
	293	}
	294
	295	SR_PRIV int korad_kaxxxxp_receive_data(int fd, int revents, void *cb_data)
	296	{
	297	struct sr_dev_inst *sdi;
	298	struct dev_context *devc;
	299	struct sr_serial_dev_inst *serial;
	300	struct sr_datafeed_packet packet;
	301	struct sr_datafeed_analog analog;
	302	struct sr_analog_encoding encoding;
	303	struct sr_analog_meaning meaning;
	304	struct sr_analog_spec spec;
	305	GSList *l;
	306
	307	(void)fd;
	308
	309	if (!(sdi = cb_data))
	310	return TRUE;
	311
	312	if (!(devc = sdi->priv))
	313	return TRUE;
	314
	315	serial = sdi->conn;
	316
	317	if (revents == G_IO_IN) {
	318	/* Get the value. */
	319	korad_kaxxxxp_get_value(serial, devc->acquisition_target, devc);
	320
	321	/* Note: digits/spec_digits will be overridden later. */
	322	sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
	323
	324	/* Send the value forward. */
	325	packet.type = SR_DF_ANALOG;
	326	packet.payload = &analog;
	327	analog.num_samples = 1;
	328	l = g_slist_copy(sdi->channels);
	329	if (devc->acquisition_target == KAXXXXP_CURRENT) {
	330	l = g_slist_remove_link(l, g_slist_nth(l, 0));
	331	analog.meaning->channels = l;
	332	analog.meaning->mq = SR_MQ_CURRENT;
	333	analog.meaning->unit = SR_UNIT_AMPERE;
	334	analog.meaning->mqflags = 0;
	335	analog.encoding->digits = 3;
	336	analog.spec->spec_digits = 3;
	337	analog.data = &devc->current;
	338	sr_session_send(sdi, &packet);
	339	}
	340	else if (devc->acquisition_target == KAXXXXP_VOLTAGE) {
	341	l = g_slist_remove_link(l, g_slist_nth(l, 1));
	342	analog.meaning->channels = l;
	343	analog.meaning->mq = SR_MQ_VOLTAGE;
	344	analog.meaning->unit = SR_UNIT_VOLT;
	345	analog.meaning->mqflags = SR_MQFLAG_DC;
	346	analog.encoding->digits = 2;
	347	analog.spec->spec_digits = 2;
	348	analog.data = &devc->voltage;
	349	sr_session_send(sdi, &packet);
	350	sr_sw_limits_update_samples_read(&devc->limits, 1);
	351	}
	352	next_measurement(devc);
	353	}
	354
	355	if (sr_sw_limits_check(&devc->limits))
	356	sr_dev_acquisition_stop(sdi);
	357
	358	return TRUE;
	359	}