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

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2012-2013 Uwe Hermann <uwe@hermann-uwe.de>
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include <config.h>
#include <string.h>
#include <glib.h>
#include <libsigrok/libsigrok.h>
#include "libsigrok-internal.h"
#include "protocol.h"

/*
 * Driver for various UNI-T multimeters (and rebranded ones).
 *
 * Most UNI-T DMMs can be used with two (three) different PC interface cables:
 *  - The UT-D04 USB/HID cable, old version with Hoitek HE2325U chip.
 *  - The UT-D04 USB/HID cable, new version with WCH CH9325 chip.
 *  - The UT-D02 RS232 cable.
 *
 * This driver is meant to support all USB/HID cables, and various DMMs that
 * can be attached to a PC via these cables. Currently only the UT-D04 cable
 * (new version) is supported/tested.
 * The UT-D02 RS232 cable is handled by the 'serial-dmm' driver.
 *
 * The data for one DMM packet (e.g. 14 bytes if the respective DMM uses a
 * Fortune Semiconductor FS9922-DMM4 chip) is spread across multiple
 * 8-byte chunks.
 *
 * An 8-byte chunk looks like this:
 *  - Byte 0: 0xfz, where z is the number of actual data bytes in this chunk.
 *  - Bytes 1-7: z data bytes, the rest of the bytes should be ignored.
 *
 * Example:
 *  f0 00 00 00 00 00 00 00 (no data bytes)
 *  f2 55 77 00 00 00 00 00 (2 data bytes, 0x55 and 0x77)
 *  f1 d1 00 00 00 00 00 00 (1 data byte, 0xd1)
 */

static void decode_packet(struct sr_dev_inst *sdi, const uint8_t *buf)
{
	struct dev_context *devc;
	struct dmm_info *dmm;
	struct sr_datafeed_packet packet;
	struct sr_datafeed_analog_old analog;
	float floatval;
	void *info;
	int ret;

	devc = sdi->priv;
	dmm = (struct dmm_info *)sdi->driver;
	memset(&analog, 0, sizeof(struct sr_datafeed_analog_old));
	info = g_malloc(dmm->info_size);

	/* Parse the protocol packet. */
	ret = dmm->packet_parse(buf, &floatval, &analog, info);
	if (ret != SR_OK) {
		sr_dbg("Invalid DMM packet, ignoring.");
		g_free(info);
		return;
	}

	/* If this DMM needs additional handling, call the resp. function. */
	if (dmm->dmm_details)
		dmm->dmm_details(&analog, info);

	g_free(info);

	/* Send a sample packet with one analog value. */
	analog.channels = sdi->channels;
	analog.num_samples = 1;
	analog.data = &floatval;
	packet.type = SR_DF_ANALOG_OLD;
	packet.payload = &analog;
	sr_session_send(devc->cb_data, &packet);

	/* Increase sample count. */
	devc->num_samples++;
}

static int hid_chip_init(struct sr_dev_inst *sdi, uint16_t baudrate)
{
	int ret;
	uint8_t buf[5];
	struct sr_usb_dev_inst *usb;

	usb = sdi->conn;
	
	/* Detach kernel drivers which grabbed this device (if any). */
	if (libusb_kernel_driver_active(usb->devhdl, 0) == 1) {
		ret = libusb_detach_kernel_driver(usb->devhdl, 0);
		if (ret < 0) {
			sr_err("Failed to detach kernel driver: %s.",
			       libusb_error_name(ret));
			return SR_ERR;
		}
		sr_dbg("Successfully detached kernel driver.");
	} else {
		sr_dbg("No need to detach a kernel driver.");
	}

	/* Claim interface 0. */
	if ((ret = libusb_claim_interface(usb->devhdl, 0)) < 0) {
		sr_err("Failed to claim interface 0: %s.",
		       libusb_error_name(ret));
		return SR_ERR;
	}
	sr_dbg("Successfully claimed interface 0.");

	/* Set data for the HID feature report (e.g. baudrate). */
	buf[0] = baudrate & 0xff;        /* Baudrate, LSB */
	buf[1] = (baudrate >> 8) & 0xff; /* Baudrate, MSB */
	buf[2] = 0x00;                   /* Unknown/unused (?) */
	buf[3] = 0x00;                   /* Unknown/unused (?) */
	buf[4] = 0x03;                   /* Unknown, always 0x03. */

	/* Send HID feature report to setup the baudrate/chip. */
	sr_dbg("Sending initial HID feature report.");
	sr_spew("HID init = 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x (%d baud)",
		buf[0], buf[1], buf[2], buf[3], buf[4], baudrate);
	ret = libusb_control_transfer(
		usb->devhdl, /* libusb device handle */
		LIBUSB_REQUEST_TYPE_CLASS |
		LIBUSB_RECIPIENT_INTERFACE |
		LIBUSB_ENDPOINT_OUT,
		9, /* bRequest: HID set_report */
		0x300, /* wValue: HID feature, report number 0 */
		0, /* wIndex: interface 0 */
		(unsigned char *)&buf, /* payload buffer */
		5, /* wLength: 5 bytes payload */
		1000 /* timeout (ms) */);

	if (ret < 0) {
		sr_err("HID feature report error: %s.", libusb_error_name(ret));
		return SR_ERR;
	}

	if (ret != 5) {
		/* TODO: Handle better by also sending the remaining bytes. */
		sr_err("Short packet: sent %d/5 bytes.", ret);
		return SR_ERR;
	}

	sr_dbg("Successfully sent initial HID feature report.");

	return SR_OK;
}

static void log_8byte_chunk(const uint8_t *buf)
{
	sr_spew("8-byte chunk: %02x %02x %02x %02x %02x %02x %02x %02x "
		"(%d data bytes)", buf[0], buf[1], buf[2], buf[3],
		buf[4], buf[5], buf[6], buf[7], (buf[0] & 0x0f));
}

static void log_dmm_packet(const uint8_t *buf)
{
	sr_dbg("DMM packet:   %02x %02x %02x %02x %02x %02x %02x"
	       " %02x %02x %02x %02x %02x %02x %02x",
	       buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6],
	       buf[7], buf[8], buf[9], buf[10], buf[11], buf[12], buf[13]);
}

static int get_and_handle_data(struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	struct dmm_info *dmm;
	uint8_t buf[CHUNK_SIZE], *pbuf;
	int i, ret, len, num_databytes_in_chunk;
	struct sr_usb_dev_inst *usb;

	devc = sdi->priv;
	dmm = (struct dmm_info *)sdi->driver;
	usb = sdi->conn;
	pbuf = devc->protocol_buf;

	/* On the first run, we need to init the HID chip. */
	if (devc->first_run) {
		if ((ret = hid_chip_init(sdi, dmm->baudrate)) != SR_OK) {
			sr_err("HID chip init failed: %d.", ret);
			return SR_ERR;
		}
		memset(pbuf, 0x00, DMM_BUFSIZE);
		devc->first_run = FALSE;
	}

	memset(&buf, 0x00, CHUNK_SIZE);

	/* Get data from EP2 using an interrupt transfer. */
	ret = libusb_interrupt_transfer(
		usb->devhdl, /* libusb device handle */
		LIBUSB_ENDPOINT_IN | 2, /* EP2, IN */
		(unsigned char *)&buf, /* receive buffer */
		CHUNK_SIZE, /* wLength */
		&len, /* actually received byte count */
		1000 /* timeout (ms) */);

	if (ret < 0) {
		sr_err("USB receive error: %s.", libusb_error_name(ret));
		return SR_ERR;
	}

	if (len != CHUNK_SIZE) {
		sr_err("Short packet: received %d/%d bytes.", len, CHUNK_SIZE);
		/* TODO: Print the bytes? */
		return SR_ERR;
	}

	log_8byte_chunk((const uint8_t *)&buf);

	/* If there are no data bytes just return (without error). */
	if (buf[0] == 0xf0)
		return SR_OK;

	devc->bufoffset = 0;

	/*
	 * Append the 1-7 data bytes of this chunk to pbuf.
	 *
	 * Special case:
	 * DMMs with Cyrustek ES51922 chip and UT71x DMMs need serial settings
	 * of 7o1. The WCH CH9325 UART to USB/HID chip used in (some
	 * versions of) the UNI-T UT-D04 cable however, will also send
	 * the parity bit to the host in the 8-byte data chunks. This bit
	 * is encoded in bit 7 of each of the 1-7 data bytes and must thus
	 * be removed in order for the actual protocol parser to work properly.
	 */
	num_databytes_in_chunk = buf[0] & 0x0f;
	for (i = 0; i < num_databytes_in_chunk; i++, devc->buflen++) {
		pbuf[devc->buflen] = buf[1 + i];
		if ((dmm->packet_parse == sr_es519xx_19200_14b_parse) ||
		    (dmm->packet_parse == sr_ut71x_parse)) {
			/* Mask off the parity bit. */
			pbuf[devc->buflen] &= ~(1 << 7);
		}
	}

	/* Now look for packets in that data. */
	while ((devc->buflen - devc->bufoffset) >= dmm->packet_size) {
		if (dmm->packet_valid(pbuf + devc->bufoffset)) {
			log_dmm_packet(pbuf + devc->bufoffset);
			decode_packet(sdi, pbuf + devc->bufoffset);
			devc->bufoffset += dmm->packet_size;
		} else {
			devc->bufoffset++;
		}
	}

	/* Move remaining bytes to beginning of buffer. */
	for (i = 0; i < devc->buflen - devc->bufoffset; i++)
		pbuf[i] = pbuf[devc->bufoffset + i];
	devc->buflen -= devc->bufoffset;

	return SR_OK;
}

SR_PRIV int uni_t_dmm_receive_data(int fd, int revents, void *cb_data)
{
	int ret;
	struct sr_dev_inst *sdi;
	struct dev_context *devc;
	int64_t time_ms;

	(void)fd;
	(void)revents;

	sdi = cb_data;
	devc = sdi->priv;

	if ((ret = get_and_handle_data(sdi)) != SR_OK)
		return FALSE;

	/* Abort acquisition if we acquired enough samples. */
	if (devc->limit_samples && devc->num_samples >= devc->limit_samples) {
		sr_info("Requested number of samples reached.");
		sdi->driver->dev_acquisition_stop(sdi, cb_data);
	}

	if (devc->limit_msec) {
		time_ms = (g_get_monotonic_time() - devc->starttime) / 1000;
		if (time_ms > (int64_t)devc->limit_msec) {
			sr_info("Requested time limit reached.");
			sdi->driver->dev_acquisition_stop(sdi, cb_data);
			return TRUE;
		}
	}

	return TRUE;
}
Commit	Line	Data
79081ec8	1	/*
50985c20	2	* This file is part of the libsigrok project.
79081ec8	3	*
bc653a56	4	* Copyright (C) 2012-2013 Uwe Hermann <uwe@hermann-uwe.de>
79081ec8 UH	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 2 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, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
6ec6c43b	21	#include <config.h>
79081ec8 UH	22	#include <string.h>
79081ec8 UH	23	#include <glib.h>
c1aae900	24	#include <libsigrok/libsigrok.h>
79081ec8 UH	25	#include "libsigrok-internal.h"
	26	#include "protocol.h"
	27
	28	/*
	29	* Driver for various UNI-T multimeters (and rebranded ones).
	30	*
	31	* Most UNI-T DMMs can be used with two (three) different PC interface cables:
	32	* - The UT-D04 USB/HID cable, old version with Hoitek HE2325U chip.
	33	* - The UT-D04 USB/HID cable, new version with WCH CH9325 chip.
c8852687	34	* - The UT-D02 RS232 cable.
79081ec8	35	*
c8852687	36	* This driver is meant to support all USB/HID cables, and various DMMs that
79081ec8	37	* can be attached to a PC via these cables. Currently only the UT-D04 cable
c8852687 UH	38	* (new version) is supported/tested.
c8852687 UH	39	* The UT-D02 RS232 cable is handled by the 'serial-dmm' driver.
79081ec8 UH	40	*
	41	* The data for one DMM packet (e.g. 14 bytes if the respective DMM uses a
	42	* Fortune Semiconductor FS9922-DMM4 chip) is spread across multiple
	43	* 8-byte chunks.
	44	*
	45	* An 8-byte chunk looks like this:
	46	* - Byte 0: 0xfz, where z is the number of actual data bytes in this chunk.
	47	* - Bytes 1-7: z data bytes, the rest of the bytes should be ignored.
	48	*
	49	* Example:
	50	* f0 00 00 00 00 00 00 00 (no data bytes)
	51	* f2 55 77 00 00 00 00 00 (2 data bytes, 0x55 and 0x77)
	52	* f1 d1 00 00 00 00 00 00 (1 data byte, 0xd1)
79081ec8 UH	53	*/
79081ec8 UH	54
f0540611	55	static void decode_packet(struct sr_dev_inst sdi, const uint8_t buf)
79081ec8	56	{
bc653a56	57	struct dev_context *devc;
f0540611	58	struct dmm_info *dmm;
79081ec8	59	struct sr_datafeed_packet packet;
5faebab2	60	struct sr_datafeed_analog_old analog;
79081ec8	61	float floatval;
f0540611	62	void *info;
79081ec8 UH	63	int ret;
79081ec8 UH	64
69e19dd7	65	devc = sdi->priv;
f0540611	66	dmm = (struct dmm_info *)sdi->driver;
5faebab2	67	memset(&analog, 0, sizeof(struct sr_datafeed_analog_old));
f0540611	68	info = g_malloc(dmm->info_size);
79081ec8 UH	69
79081ec8 UH	70	/* Parse the protocol packet. */
f0540611	71	ret = dmm->packet_parse(buf, &floatval, &analog, info);
fdbcb86d	72	if (ret != SR_OK) {
bc653a56	73	sr_dbg("Invalid DMM packet, ignoring.");
f0540611	74	g_free(info);
79081ec8 UH	75	return;
	76	}
	77
c8852687	78	/* If this DMM needs additional handling, call the resp. function. */
f0540611 ML	79	if (dmm->dmm_details)
	80	dmm->dmm_details(&analog, info);
	81
	82	g_free(info);
c8852687	83
79081ec8	84	/* Send a sample packet with one analog value. */
ba7dd8bb	85	analog.channels = sdi->channels;
79081ec8 UH	86	analog.num_samples = 1;
79081ec8 UH	87	analog.data = &floatval;
5faebab2	88	packet.type = SR_DF_ANALOG_OLD;
79081ec8 UH	89	packet.payload = &analog;
	90	sr_session_send(devc->cb_data, &packet);
	91
	92	/* Increase sample count. */
	93	devc->num_samples++;
	94	}
	95
3ece1dff	96	static int hid_chip_init(struct sr_dev_inst *sdi, uint16_t baudrate)
79081ec8 UH	97	{
	98	int ret;
	99	uint8_t buf[5];
3ece1dff	100	struct sr_usb_dev_inst *usb;
79081ec8	101
3ece1dff UH	102	usb = sdi->conn;
3ece1dff UH	103
79081ec8	104	/* Detach kernel drivers which grabbed this device (if any). */
3ece1dff UH	105	if (libusb_kernel_driver_active(usb->devhdl, 0) == 1) {
3ece1dff UH	106	ret = libusb_detach_kernel_driver(usb->devhdl, 0);
79081ec8	107	if (ret < 0) {
d4928d71 PS	108	sr_err("Failed to detach kernel driver: %s.",
d4928d71 PS	109	libusb_error_name(ret));
79081ec8 UH	110	return SR_ERR;
	111	}
	112	sr_dbg("Successfully detached kernel driver.");
	113	} else {
	114	sr_dbg("No need to detach a kernel driver.");
	115	}
	116
	117	/* Claim interface 0. */
3ece1dff	118	if ((ret = libusb_claim_interface(usb->devhdl, 0)) < 0) {
d4928d71 PS	119	sr_err("Failed to claim interface 0: %s.",
d4928d71 PS	120	libusb_error_name(ret));
79081ec8 UH	121	return SR_ERR;
	122	}
	123	sr_dbg("Successfully claimed interface 0.");
	124
bc653a56	125	/* Set data for the HID feature report (e.g. baudrate). */
79081ec8 UH	126	buf[0] = baudrate & 0xff; /* Baudrate, LSB */
	127	buf[1] = (baudrate >> 8) & 0xff; /* Baudrate, MSB */
	128	buf[2] = 0x00; /* Unknown/unused (?) */
	129	buf[3] = 0x00; /* Unknown/unused (?) */
	130	buf[4] = 0x03; /* Unknown, always 0x03. */
	131
	132	/* Send HID feature report to setup the baudrate/chip. */
	133	sr_dbg("Sending initial HID feature report.");
	134	sr_spew("HID init = 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x (%d baud)",
	135	buf[0], buf[1], buf[2], buf[3], buf[4], baudrate);
	136	ret = libusb_control_transfer(
3ece1dff	137	usb->devhdl, /* libusb device handle */
79081ec8 UH	138	LIBUSB_REQUEST_TYPE_CLASS \|
	139	LIBUSB_RECIPIENT_INTERFACE \|
	140	LIBUSB_ENDPOINT_OUT,
	141	9, /* bRequest: HID set_report */
	142	0x300, /* wValue: HID feature, report number 0 */
	143	0, /* wIndex: interface 0 */
	144	(unsigned char )&buf, / payload buffer */
	145	5, /* wLength: 5 bytes payload */
	146	1000 /* timeout (ms) */);
	147
	148	if (ret < 0) {
d4928d71	149	sr_err("HID feature report error: %s.", libusb_error_name(ret));
79081ec8 UH	150	return SR_ERR;
	151	}
	152
	153	if (ret != 5) {
	154	/* TODO: Handle better by also sending the remaining bytes. */
	155	sr_err("Short packet: sent %d/5 bytes.", ret);
	156	return SR_ERR;
	157	}
	158
	159	sr_dbg("Successfully sent initial HID feature report.");
	160
	161	return SR_OK;
	162	}
	163
	164	static void log_8byte_chunk(const uint8_t *buf)
	165	{
	166	sr_spew("8-byte chunk: %02x %02x %02x %02x %02x %02x %02x %02x "
	167	"(%d data bytes)", buf[0], buf[1], buf[2], buf[3],
	168	buf[4], buf[5], buf[6], buf[7], (buf[0] & 0x0f));
	169	}
	170
	171	static void log_dmm_packet(const uint8_t *buf)
	172	{
	173	sr_dbg("DMM packet: %02x %02x %02x %02x %02x %02x %02x"
	174	" %02x %02x %02x %02x %02x %02x %02x",
	175	buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6],
	176	buf[7], buf[8], buf[9], buf[10], buf[11], buf[12], buf[13]);
	177	}
	178
f0540611	179	static int get_and_handle_data(struct sr_dev_inst *sdi)
79081ec8	180	{
79081ec8	181	struct dev_context *devc;
f0540611	182	struct dmm_info *dmm;
bc653a56	183	uint8_t buf[CHUNK_SIZE], *pbuf;
79081ec8	184	int i, ret, len, num_databytes_in_chunk;
3ece1dff	185	struct sr_usb_dev_inst *usb;
79081ec8	186
79081ec8	187	devc = sdi->priv;
f0540611	188	dmm = (struct dmm_info *)sdi->driver;
3ece1dff	189	usb = sdi->conn;
79081ec8 UH	190	pbuf = devc->protocol_buf;
	191
	192	/* On the first run, we need to init the HID chip. */
bc653a56	193	if (devc->first_run) {
f0540611	194	if ((ret = hid_chip_init(sdi, dmm->baudrate)) != SR_OK) {
79081ec8	195	sr_err("HID chip init failed: %d.", ret);
bc653a56	196	return SR_ERR;
79081ec8	197	}
bc653a56 UH	198	memset(pbuf, 0x00, DMM_BUFSIZE);
bc653a56 UH	199	devc->first_run = FALSE;
79081ec8 UH	200	}
	201
	202	memset(&buf, 0x00, CHUNK_SIZE);
	203
	204	/* Get data from EP2 using an interrupt transfer. */
	205	ret = libusb_interrupt_transfer(
3ece1dff	206	usb->devhdl, /* libusb device handle */
79081ec8 UH	207	LIBUSB_ENDPOINT_IN \| 2, /* EP2, IN */
	208	(unsigned char )&buf, / receive buffer */
	209	CHUNK_SIZE, /* wLength */
	210	&len, /* actually received byte count */
	211	1000 /* timeout (ms) */);
	212
	213	if (ret < 0) {
d4928d71	214	sr_err("USB receive error: %s.", libusb_error_name(ret));
bc653a56	215	return SR_ERR;
79081ec8 UH	216	}
	217
	218	if (len != CHUNK_SIZE) {
	219	sr_err("Short packet: received %d/%d bytes.", len, CHUNK_SIZE);
	220	/* TODO: Print the bytes? */
bc653a56	221	return SR_ERR;
79081ec8 UH	222	}
	223
	224	log_8byte_chunk((const uint8_t *)&buf);
	225
bc653a56 UH	226	/* If there are no data bytes just return (without error). */
	227	if (buf[0] == 0xf0)
	228	return SR_OK;
	229
	230	devc->bufoffset = 0;
	231
4d7ddff7 UH	232	/*
	233	* Append the 1-7 data bytes of this chunk to pbuf.
	234	*
	235	* Special case:
8769478c UH	236	* DMMs with Cyrustek ES51922 chip and UT71x DMMs need serial settings
8769478c UH	237	* of 7o1. The WCH CH9325 UART to USB/HID chip used in (some
4d7ddff7 UH	238	* versions of) the UNI-T UT-D04 cable however, will also send
	239	* the parity bit to the host in the 8-byte data chunks. This bit
	240	* is encoded in bit 7 of each of the 1-7 data bytes and must thus
8769478c	241	* be removed in order for the actual protocol parser to work properly.
4d7ddff7	242	*/
bc653a56	243	num_databytes_in_chunk = buf[0] & 0x0f;
4d7ddff7 UH	244	for (i = 0; i < num_databytes_in_chunk; i++, devc->buflen++) {
4d7ddff7 UH	245	pbuf[devc->buflen] = buf[1 + i];
f0540611 ML	246	if ((dmm->packet_parse == sr_es519xx_19200_14b_parse) \|\|
f0540611 ML	247	(dmm->packet_parse == sr_ut71x_parse)) {
8769478c	248	/* Mask off the parity bit. */
4d7ddff7	249	pbuf[devc->buflen] &= ~(1 << 7);
8769478c	250	}
4d7ddff7	251	}
bc653a56 UH	252
bc653a56 UH	253	/* Now look for packets in that data. */
f0540611 ML	254	while ((devc->buflen - devc->bufoffset) >= dmm->packet_size) {
f0540611 ML	255	if (dmm->packet_valid(pbuf + devc->bufoffset)) {
bc653a56	256	log_dmm_packet(pbuf + devc->bufoffset);
f0540611 ML	257	decode_packet(sdi, pbuf + devc->bufoffset);
f0540611 ML	258	devc->bufoffset += dmm->packet_size;
bc653a56 UH	259	} else {
bc653a56 UH	260	devc->bufoffset++;
79081ec8	261	}
bc653a56	262	}
79081ec8	263
bc653a56 UH	264	/* Move remaining bytes to beginning of buffer. */
	265	for (i = 0; i < devc->buflen - devc->bufoffset; i++)
	266	pbuf[i] = pbuf[devc->bufoffset + i];
	267	devc->buflen -= devc->bufoffset;
79081ec8	268
bc653a56 UH	269	return SR_OK;
	270	}
	271
f0540611	272	SR_PRIV int uni_t_dmm_receive_data(int fd, int revents, void *cb_data)
bc653a56 UH	273	{
	274	int ret;
	275	struct sr_dev_inst *sdi;
	276	struct dev_context *devc;
c5ffac41	277	int64_t time_ms;
c8852687	278
bc653a56 UH	279	(void)fd;
bc653a56 UH	280	(void)revents;
c8852687	281
bc653a56 UH	282	sdi = cb_data;
bc653a56 UH	283	devc = sdi->priv;
c8852687	284
f0540611	285	if ((ret = get_and_handle_data(sdi)) != SR_OK)
bc653a56	286	return FALSE;
79081ec8 UH	287
79081ec8 UH	288	/* Abort acquisition if we acquired enough samples. */
35e199da	289	if (devc->limit_samples && devc->num_samples >= devc->limit_samples) {
79081ec8 UH	290	sr_info("Requested number of samples reached.");
	291	sdi->driver->dev_acquisition_stop(sdi, cb_data);
	292	}
	293
c5ffac41 UH	294	if (devc->limit_msec) {
	295	time_ms = (g_get_monotonic_time() - devc->starttime) / 1000;
	296	if (time_ms > (int64_t)devc->limit_msec) {
	297	sr_info("Requested time limit reached.");
	298	sdi->driver->dev_acquisition_stop(sdi, cb_data);
	299	return TRUE;
	300	}
	301	}
	302
79081ec8 UH	303	return TRUE;
79081ec8 UH	304	}