[libsigrok.git] / src / hardware / uni-t-ut32x / protocol.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2013 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 <math.h>
#include "protocol.h"

static float parse_temperature(unsigned char *buf)
{
	float temp;
	int i;
	gboolean negative;

	negative = FALSE;
	temp = 0.0;
	for (i = 0; i < 4; i++) {
		if (buf[i] == 0x3a)
			continue;
		if (buf[i] == 0x3b) {
			if (negative) {
				sr_dbg("Double negative sign!");
				return NAN;
			} else {
				negative = TRUE;
				continue;
			}
		}
		if (buf[i] < 0x30 || buf[i] > 0x39) {
			sr_dbg("Invalid digit '%.2x'!", buf[i]);
			return NAN;
		}
		temp *= 10;
		temp += (buf[i] - 0x30);
	}
	temp /= 10;
	if (negative)
		temp = -temp;

	return temp;
}

static void process_packet(struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	struct sr_datafeed_packet packet;
	struct sr_datafeed_analog_old analog;
	GString *spew;
	float temp;
	int i;
	gboolean is_valid;

	devc = sdi->priv;
	sr_dbg("Received full 19-byte packet.");
	if (sr_log_loglevel_get() >= SR_LOG_SPEW) {
		spew = g_string_sized_new(60);
		for (i = 0; i < devc->packet_len; i++)
			g_string_append_printf(spew, "%.2x ", devc->packet[i]);
		sr_spew("%s", spew->str);
		g_string_free(spew, TRUE);
	}

	is_valid = TRUE;
	if (devc->packet[1] == 0x3b && devc->packet[2] == 0x3b
			&& devc->packet[3] == 0x3b && devc->packet[4] == 0x3b)
		/* No measurement: missing channel, empty storage location, ... */
		is_valid = FALSE;

	temp = parse_temperature(devc->packet + 1);
	if (isnan(temp))
		is_valid = FALSE;

	if (is_valid) {
		memset(&analog, 0, sizeof(struct sr_datafeed_analog_old));
		analog.mq = SR_MQ_TEMPERATURE;
		analog.mqflags = 0;
		switch (devc->packet[5] - 0x30) {
		case 1:
			analog.unit = SR_UNIT_CELSIUS;
			break;
		case 2:
			analog.unit = SR_UNIT_FAHRENHEIT;
			break;
		case 3:
			analog.unit = SR_UNIT_KELVIN;
			break;
		default:
			/* We can still pass on the measurement, whatever it is. */
			sr_dbg("Unknown unit 0x%.2x.", devc->packet[5]);
		}
		switch (devc->packet[13] - 0x30) {
		case 0:
			/* Channel T1. */
			analog.channels = g_slist_append(NULL, g_slist_nth_data(sdi->channels, 0));
			break;
		case 1:
			/* Channel T2. */
			analog.channels = g_slist_append(NULL, g_slist_nth_data(sdi->channels, 1));
			break;
		case 2:
		case 3:
			/* Channel T1-T2. */
			analog.channels = g_slist_append(NULL, g_slist_nth_data(sdi->channels, 2));
			analog.mqflags |= SR_MQFLAG_RELATIVE;
			break;
		default:
			sr_err("Unknown channel 0x%.2x.", devc->packet[13]);
			is_valid = FALSE;
		}
		if (is_valid) {
			analog.num_samples = 1;
			analog.data = &temp;
			packet.type = SR_DF_ANALOG_OLD;
			packet.payload = &analog;
			sr_session_send(sdi, &packet);
			g_slist_free(analog.channels);
		}
	}

	/* We count packets even if the temperature was invalid. This way
	 * a sample limit on "Memory" data source still works: unused
	 * memory slots come through as "----" measurements. */
	devc->num_samples++;
	if (devc->limit_samples && devc->num_samples >= devc->limit_samples) {
		sdi->driver->dev_acquisition_stop(sdi);
	}

}

SR_PRIV void LIBUSB_CALL uni_t_ut32x_receive_transfer(struct libusb_transfer *transfer)
{
	struct dev_context *devc;
	struct sr_dev_inst *sdi;
	int hid_payload_len, ret;

	sdi = transfer->user_data;
	devc = sdi->priv;
	if (transfer->actual_length == 8) {
		/* CH9325 encodes length in low nibble of first byte, with
		 * bytes 1-7 being the (padded) payload. */
		hid_payload_len = transfer->buffer[0] & 0x0f;
		memcpy(devc->packet + devc->packet_len, transfer->buffer + 1,
				hid_payload_len);
		devc->packet_len += hid_payload_len;
		if (devc->packet_len >= 2
				&& devc->packet[devc->packet_len - 2] == 0x0d
				&& devc->packet[devc->packet_len - 1] == 0x0a) {
			/* Got end of packet, but do we have a complete packet? */
			if (devc->packet_len == 19)
				process_packet(sdi);
			/* Either way, done with it. */
			devc->packet_len = 0;
		} else if (devc->packet_len > 19) {
			/* Guard against garbage from the device overrunning
			 * our packet buffer. */
			sr_dbg("Buffer overrun!");
			devc->packet_len = 0;
		}
	}

	/* Get the next transfer (unless we're shutting down). */
	if (sdi->status != SR_ST_STOPPING) {
		if ((ret = libusb_submit_transfer(devc->xfer)) != 0) {
			sr_dbg("Failed to resubmit transfer: %s", libusb_error_name(ret));
			sdi->status = SR_ST_STOPPING;
			libusb_free_transfer(devc->xfer);
		}
	} else
		libusb_free_transfer(devc->xfer);

}

SR_PRIV int uni_t_ut32x_handle_events(int fd, int revents, void *cb_data)
{
	struct drv_context *drvc;
	struct dev_context *devc;
	struct sr_dev_driver *di;
	struct sr_dev_inst *sdi;
	struct sr_usb_dev_inst *usb;
	struct timeval tv;
	int len, ret;
	unsigned char cmd[2];

	(void)fd;
	(void)revents;

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

	di = sdi->driver;
	drvc = di->context;

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

	memset(&tv, 0, sizeof(struct timeval));
	libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
			NULL);

	if (sdi->status == SR_ST_STOPPING) {
		usb_source_remove(sdi->session, drvc->sr_ctx);
		std_session_send_df_end(sdi, LOG_PREFIX);

		/* Tell the device to stop sending USB packets. */
		usb = sdi->conn;
		cmd[0] = 0x01;
		cmd[1] = CMD_STOP;
		ret = libusb_bulk_transfer(usb->devhdl, EP_OUT, cmd, 2, &len, 5);
		if (ret != 0 || len != 2) {
			/* Warning only, doesn't matter. */
			sr_dbg("Failed to send stop command: %s", libusb_error_name(ret));
		}

		sdi->status = SR_ST_ACTIVE;
		return TRUE;
	}

	return TRUE;
}
Commit	Line	Data
3877dde4 BV	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2013 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
6ec6c43b	20	#include <config.h>
d6ff054a BV	21	#include <string.h>
d6ff054a BV	22	#include <math.h>
515ab088	23	#include "protocol.h"
d6ff054a	24
d6ff054a	25	static float parse_temperature(unsigned char *buf)
3877dde4	26	{
d6ff054a BV	27	float temp;
	28	int i;
	29	gboolean negative;
	30
	31	negative = FALSE;
	32	temp = 0.0;
	33	for (i = 0; i < 4; i++) {
	34	if (buf[i] == 0x3a)
	35	continue;
	36	if (buf[i] == 0x3b) {
	37	if (negative) {
	38	sr_dbg("Double negative sign!");
	39	return NAN;
	40	} else {
	41	negative = TRUE;
	42	continue;
	43	}
	44	}
	45	if (buf[i] < 0x30 \|\| buf[i] > 0x39) {
	46	sr_dbg("Invalid digit '%.2x'!", buf[i]);
	47	return NAN;
	48	}
	49	temp *= 10;
	50	temp += (buf[i] - 0x30);
	51	}
	52	temp /= 10;
	53	if (negative)
	54	temp = -temp;
3877dde4	55
d6ff054a BV	56	return temp;
	57	}
	58
	59	static void process_packet(struct sr_dev_inst *sdi)
	60	{
3877dde4	61	struct dev_context *devc;
d6ff054a	62	struct sr_datafeed_packet packet;
5faebab2	63	struct sr_datafeed_analog_old analog;
d6ff054a BV	64	GString *spew;
	65	float temp;
	66	int i;
	67	gboolean is_valid;
3877dde4	68
d6ff054a BV	69	devc = sdi->priv;
	70	sr_dbg("Received full 19-byte packet.");
	71	if (sr_log_loglevel_get() >= SR_LOG_SPEW) {
	72	spew = g_string_sized_new(60);
	73	for (i = 0; i < devc->packet_len; i++)
	74	g_string_append_printf(spew, "%.2x ", devc->packet[i]);
	75	sr_spew("%s", spew->str);
	76	g_string_free(spew, TRUE);
	77	}
3877dde4	78
d6ff054a BV	79	is_valid = TRUE;
	80	if (devc->packet[1] == 0x3b && devc->packet[2] == 0x3b
	81	&& devc->packet[3] == 0x3b && devc->packet[4] == 0x3b)
ba7dd8bb	82	/* No measurement: missing channel, empty storage location, ... */
d6ff054a	83	is_valid = FALSE;
3877dde4	84
d6ff054a BV	85	temp = parse_temperature(devc->packet + 1);
	86	if (isnan(temp))
	87	is_valid = FALSE;
	88
	89	if (is_valid) {
5faebab2	90	memset(&analog, 0, sizeof(struct sr_datafeed_analog_old));
d6ff054a BV	91	analog.mq = SR_MQ_TEMPERATURE;
	92	analog.mqflags = 0;
	93	switch (devc->packet[5] - 0x30) {
	94	case 1:
	95	analog.unit = SR_UNIT_CELSIUS;
	96	break;
	97	case 2:
	98	analog.unit = SR_UNIT_FAHRENHEIT;
	99	break;
	100	case 3:
	101	analog.unit = SR_UNIT_KELVIN;
	102	break;
	103	default:
	104	/* We can still pass on the measurement, whatever it is. */
	105	sr_dbg("Unknown unit 0x%.2x.", devc->packet[5]);
	106	}
	107	switch (devc->packet[13] - 0x30) {
	108	case 0:
ba7dd8bb UH	109	/* Channel T1. */
ba7dd8bb UH	110	analog.channels = g_slist_append(NULL, g_slist_nth_data(sdi->channels, 0));
d6ff054a BV	111	break;
d6ff054a BV	112	case 1:
ba7dd8bb UH	113	/* Channel T2. */
ba7dd8bb UH	114	analog.channels = g_slist_append(NULL, g_slist_nth_data(sdi->channels, 1));
d6ff054a BV	115	break;
	116	case 2:
	117	case 3:
ba7dd8bb UH	118	/* Channel T1-T2. */
ba7dd8bb UH	119	analog.channels = g_slist_append(NULL, g_slist_nth_data(sdi->channels, 2));
d6ff054a BV	120	analog.mqflags \|= SR_MQFLAG_RELATIVE;
	121	break;
	122	default:
ba7dd8bb	123	sr_err("Unknown channel 0x%.2x.", devc->packet[13]);
d6ff054a BV	124	is_valid = FALSE;
	125	}
	126	if (is_valid) {
	127	analog.num_samples = 1;
	128	analog.data = &temp;
5faebab2	129	packet.type = SR_DF_ANALOG_OLD;
d6ff054a	130	packet.payload = &analog;
695dc859	131	sr_session_send(sdi, &packet);
ba7dd8bb	132	g_slist_free(analog.channels);
d6ff054a BV	133	}
	134	}
	135
	136	/* We count packets even if the temperature was invalid. This way
	137	* a sample limit on "Memory" data source still works: unused
	138	* memory slots come through as "----" measurements. */
	139	devc->num_samples++;
	140	if (devc->limit_samples && devc->num_samples >= devc->limit_samples) {
695dc859	141	sdi->driver->dev_acquisition_stop(sdi);
3877dde4 BV	142	}
3877dde4 BV	143
3877dde4	144	}
6513f97f	145
55462b8b	146	SR_PRIV void LIBUSB_CALL uni_t_ut32x_receive_transfer(struct libusb_transfer *transfer)
6513f97f	147	{
d6ff054a BV	148	struct dev_context *devc;
	149	struct sr_dev_inst *sdi;
	150	int hid_payload_len, ret;
	151
	152	sdi = transfer->user_data;
	153	devc = sdi->priv;
	154	if (transfer->actual_length == 8) {
	155	/* CH9325 encodes length in low nibble of first byte, with
	156	* bytes 1-7 being the (padded) payload. */
	157	hid_payload_len = transfer->buffer[0] & 0x0f;
	158	memcpy(devc->packet + devc->packet_len, transfer->buffer + 1,
	159	hid_payload_len);
	160	devc->packet_len += hid_payload_len;
	161	if (devc->packet_len >= 2
	162	&& devc->packet[devc->packet_len - 2] == 0x0d
	163	&& devc->packet[devc->packet_len - 1] == 0x0a) {
	164	/* Got end of packet, but do we have a complete packet? */
	165	if (devc->packet_len == 19)
	166	process_packet(sdi);
	167	/* Either way, done with it. */
	168	devc->packet_len = 0;
	169	} else if (devc->packet_len > 19) {
	170	/* Guard against garbage from the device overrunning
	171	* our packet buffer. */
	172	sr_dbg("Buffer overrun!");
	173	devc->packet_len = 0;
	174	}
	175	}
	176
	177	/* Get the next transfer (unless we're shutting down). */
	178	if (sdi->status != SR_ST_STOPPING) {
	179	if ((ret = libusb_submit_transfer(devc->xfer)) != 0) {
	180	sr_dbg("Failed to resubmit transfer: %s", libusb_error_name(ret));
	181	sdi->status = SR_ST_STOPPING;
	182	libusb_free_transfer(devc->xfer);
	183	}
	184	} else
	185	libusb_free_transfer(devc->xfer);
6513f97f BV	186
	187	}
	188
d6ff054a BV	189	SR_PRIV int uni_t_ut32x_handle_events(int fd, int revents, void *cb_data)
	190	{
	191	struct drv_context *drvc;
	192	struct dev_context *devc;
4f840ce9	193	struct sr_dev_driver *di;
d6ff054a	194	struct sr_dev_inst *sdi;
d6ff054a BV	195	struct sr_usb_dev_inst *usb;
d6ff054a BV	196	struct timeval tv;
6c60facc	197	int len, ret;
d6ff054a BV	198	unsigned char cmd[2];
	199
	200	(void)fd;
	201	(void)revents;
8bd3daa4	202
d6ff054a BV	203	if (!(sdi = cb_data))
	204	return TRUE;
	205
4f840ce9	206	di = sdi->driver;
41812aca	207	drvc = di->context;
4f840ce9	208
d6ff054a BV	209	if (!(devc = sdi->priv))
	210	return TRUE;
	211
	212	memset(&tv, 0, sizeof(struct timeval));
	213	libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
	214	NULL);
	215
	216	if (sdi->status == SR_ST_STOPPING) {
102f1239	217	usb_source_remove(sdi->session, drvc->sr_ctx);
67ea60e0	218	std_session_send_df_end(sdi, LOG_PREFIX);
d6ff054a BV	219
	220	/* Tell the device to stop sending USB packets. */
	221	usb = sdi->conn;
	222	cmd[0] = 0x01;
	223	cmd[1] = CMD_STOP;
	224	ret = libusb_bulk_transfer(usb->devhdl, EP_OUT, cmd, 2, &len, 5);
	225	if (ret != 0 \|\| len != 2) {
	226	/* Warning only, doesn't matter. */
	227	sr_dbg("Failed to send stop command: %s", libusb_error_name(ret));
	228	}
	229
	230	sdi->status = SR_ST_ACTIVE;
	231	return TRUE;
	232	}
	233
	234	return TRUE;
	235	}