[libsigrok.git] / hardware / scpi-pps / protocol.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2014 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 <config.h>
#include <string.h>
#include <strings.h>
#include <stdarg.h>
#include "scpi.h"
#include "protocol.h"

SR_PRIV int select_channel(const struct sr_dev_inst *sdi, struct sr_channel *ch)
{
	struct dev_context *devc;
	struct pps_channel *cur_pch, *new_pch;
	int ret;

	if (g_slist_length(sdi->channels) == 1)
		return SR_OK;

	devc = sdi->priv;
	if (ch == devc->cur_channel)
		return SR_OK;

	new_pch = ch->priv;
	if (devc->cur_channel) {
		cur_pch = devc->cur_channel->priv;
		if (cur_pch->hw_output_idx == new_pch->hw_output_idx) {
			/* Same underlying output channel. */
			devc->cur_channel = ch;
			return SR_OK;
		}
	}

	if ((ret = scpi_cmd(sdi, devc->device->commands, SCPI_CMD_SELECT_CHANNEL,
			new_pch->hwname)) >= 0)
		devc->cur_channel = ch;

	return ret;
}

SR_PRIV int scpi_pps_receive_data(int fd, int revents, void *cb_data)
{
	struct dev_context *devc;
	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;
	const struct sr_dev_inst *sdi;
	struct sr_channel *next_channel;
	struct sr_scpi_dev_inst *scpi;
	struct pps_channel *pch;
	float f;
	int cmd;

	(void)fd;
	(void)revents;

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

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

	scpi = sdi->conn;

	/* Retrieve requested value for this state. */
	if (sr_scpi_get_float(scpi, NULL, &f) == SR_OK) {
		pch = devc->cur_channel->priv;
		packet.type = SR_DF_ANALOG;
		packet.payload = &analog;
		sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
		analog.meaning->channels = g_slist_append(NULL, devc->cur_channel);
		analog.num_samples = 1;
		analog.meaning->mq = pch->mq;
		if (pch->mq == SR_MQ_VOLTAGE)
			analog.meaning->unit = SR_UNIT_VOLT;
		else if (pch->mq == SR_MQ_CURRENT)
			analog.meaning->unit = SR_UNIT_AMPERE;
		else if (pch->mq == SR_MQ_POWER)
			analog.meaning->unit = SR_UNIT_WATT;
		analog.meaning->mqflags = SR_MQFLAG_DC;
		analog.data = &f;
		sr_session_send(sdi, &packet);
		g_slist_free(analog.meaning->channels);
	}

	if (g_slist_length(sdi->channels) > 1) {
		next_channel = sr_next_enabled_channel(sdi, devc->cur_channel);
		if (select_channel(sdi, next_channel) != SR_OK) {
			sr_err("Failed to select channel %s", next_channel->name);
			return FALSE;
		}
	}

	pch = devc->cur_channel->priv;
	if (pch->mq == SR_MQ_VOLTAGE)
		cmd = SCPI_CMD_GET_MEAS_VOLTAGE;
	else if (pch->mq == SR_MQ_FREQUENCY)
		cmd = SCPI_CMD_GET_MEAS_FREQUENCY;
	else if (pch->mq == SR_MQ_CURRENT)
		cmd = SCPI_CMD_GET_MEAS_CURRENT;
	else if (pch->mq == SR_MQ_POWER)
		cmd = SCPI_CMD_GET_MEAS_POWER;
	else
		return SR_ERR;
	scpi_cmd(sdi, devc->device->commands, cmd);

	return TRUE;
}
Commit	Line	Data
	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2014 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
	20	#include <config.h>
	21	#include <string.h>
	22	#include <strings.h>
	23	#include <stdarg.h>
	24	#include "scpi.h"
	25	#include "protocol.h"
	26
	27	SR_PRIV int select_channel(const struct sr_dev_inst sdi, struct sr_channel ch)
	28	{
	29	struct dev_context *devc;
	30	struct pps_channel cur_pch, new_pch;
	31	int ret;
	32
	33	if (g_slist_length(sdi->channels) == 1)
	34	return SR_OK;
	35
	36	devc = sdi->priv;
	37	if (ch == devc->cur_channel)
	38	return SR_OK;
	39
	40	new_pch = ch->priv;
	41	if (devc->cur_channel) {
	42	cur_pch = devc->cur_channel->priv;
	43	if (cur_pch->hw_output_idx == new_pch->hw_output_idx) {
	44	/* Same underlying output channel. */
	45	devc->cur_channel = ch;
	46	return SR_OK;
	47	}
	48	}
	49
	50	if ((ret = scpi_cmd(sdi, devc->device->commands, SCPI_CMD_SELECT_CHANNEL,
	51	new_pch->hwname)) >= 0)
	52	devc->cur_channel = ch;
	53
	54	return ret;
	55	}
	56
	57	SR_PRIV int scpi_pps_receive_data(int fd, int revents, void *cb_data)
	58	{
	59	struct dev_context *devc;
	60	struct sr_datafeed_packet packet;
	61	struct sr_datafeed_analog analog;
	62	struct sr_analog_encoding encoding;
	63	struct sr_analog_meaning meaning;
	64	struct sr_analog_spec spec;
	65	const struct sr_dev_inst *sdi;
	66	struct sr_channel *next_channel;
	67	struct sr_scpi_dev_inst *scpi;
	68	struct pps_channel *pch;
	69	float f;
	70	int cmd;
	71
	72	(void)fd;
	73	(void)revents;
	74
	75	if (!(sdi = cb_data))
	76	return TRUE;
	77
	78	if (!(devc = sdi->priv))
	79	return TRUE;
	80
	81	scpi = sdi->conn;
	82
	83	/* Retrieve requested value for this state. */
	84	if (sr_scpi_get_float(scpi, NULL, &f) == SR_OK) {
	85	pch = devc->cur_channel->priv;
	86	packet.type = SR_DF_ANALOG;
	87	packet.payload = &analog;
	88	sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
	89	analog.meaning->channels = g_slist_append(NULL, devc->cur_channel);
	90	analog.num_samples = 1;
	91	analog.meaning->mq = pch->mq;
	92	if (pch->mq == SR_MQ_VOLTAGE)
	93	analog.meaning->unit = SR_UNIT_VOLT;
	94	else if (pch->mq == SR_MQ_CURRENT)
	95	analog.meaning->unit = SR_UNIT_AMPERE;
	96	else if (pch->mq == SR_MQ_POWER)
	97	analog.meaning->unit = SR_UNIT_WATT;
	98	analog.meaning->mqflags = SR_MQFLAG_DC;
	99	analog.data = &f;
	100	sr_session_send(sdi, &packet);
	101	g_slist_free(analog.meaning->channels);
	102	}
	103
	104	if (g_slist_length(sdi->channels) > 1) {
	105	next_channel = sr_next_enabled_channel(sdi, devc->cur_channel);
	106	if (select_channel(sdi, next_channel) != SR_OK) {
	107	sr_err("Failed to select channel %s", next_channel->name);
	108	return FALSE;
	109	}
	110	}
	111
	112	pch = devc->cur_channel->priv;
	113	if (pch->mq == SR_MQ_VOLTAGE)
	114	cmd = SCPI_CMD_GET_MEAS_VOLTAGE;
	115	else if (pch->mq == SR_MQ_FREQUENCY)
	116	cmd = SCPI_CMD_GET_MEAS_FREQUENCY;
	117	else if (pch->mq == SR_MQ_CURRENT)
	118	cmd = SCPI_CMD_GET_MEAS_CURRENT;
	119	else if (pch->mq == SR_MQ_POWER)
	120	cmd = SCPI_CMD_GET_MEAS_POWER;
	121	else
	122	return SR_ERR;
	123	scpi_cmd(sdi, devc->device->commands, cmd);
	124
	125	return TRUE;
	126	}