[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, see <http://www.gnu.org/licenses/>.
 */

#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 analog;
	struct sr_analog_encoding encoding;
	struct sr_analog_meaning meaning;
	struct sr_analog_spec spec;
	float floatval;
	void *info;
	int ret;

	devc = sdi->priv;
	dmm = (struct dmm_info *)sdi->driver;
	/* Note: digits/spec_digits will be overridden by the DMM parsers. */
	sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
	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.meaning->channels = sdi->channels;
	analog.num_samples = 1;
	analog.data = &floatval;
	packet.type = SR_DF_ANALOG;
	packet.payload = &analog;
	sr_session_send(sdi, &packet);

	sr_sw_limits_update_samples_read(&devc->limits, 1);
}

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;

	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;
		}
	}

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

	/* 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;
	}

	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)
{
	GString *text;

	text = sr_hexdump_new(buf, 14);
	sr_dbg("DMM packet:   %s", text->str);
	sr_hexdump_free(text);
}

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_es519xx_19200_11b_parse) ||
		    (dmm->packet_parse == sr_es519xx_2400_11b_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. */
	if (devc->bufoffset < devc->buflen)
		memmove(pbuf, pbuf + devc->bufoffset, devc->buflen - devc->bufoffset);
	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;

	(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 (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) 2012-2013 Uwe Hermann <uwe@hermann-uwe.de>
	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, see <http://www.gnu.org/licenses/>.
	18	*/
	19
	20	#include <config.h>
	21	#include <string.h>
	22	#include <glib.h>
	23	#include <libsigrok/libsigrok.h>
	24	#include "libsigrok-internal.h"
	25	#include "protocol.h"
	26
	27	/*
	28	* Driver for various UNI-T multimeters (and rebranded ones).
	29	*
	30	* Most UNI-T DMMs can be used with two (three) different PC interface cables:
	31	* - The UT-D04 USB/HID cable, old version with Hoitek HE2325U chip.
	32	* - The UT-D04 USB/HID cable, new version with WCH CH9325 chip.
	33	* - The UT-D02 RS232 cable.
	34	*
	35	* This driver is meant to support all USB/HID cables, and various DMMs that
	36	* can be attached to a PC via these cables. Currently only the UT-D04 cable
	37	* (new version) is supported/tested.
	38	* The UT-D02 RS232 cable is handled by the 'serial-dmm' driver.
	39	*
	40	* The data for one DMM packet (e.g. 14 bytes if the respective DMM uses a
	41	* Fortune Semiconductor FS9922-DMM4 chip) is spread across multiple
	42	* 8-byte chunks.
	43	*
	44	* An 8-byte chunk looks like this:
	45	* - Byte 0: 0xfz, where z is the number of actual data bytes in this chunk.
	46	* - Bytes 1-7: z data bytes, the rest of the bytes should be ignored.
	47	*
	48	* Example:
	49	* f0 00 00 00 00 00 00 00 (no data bytes)
	50	* f2 55 77 00 00 00 00 00 (2 data bytes, 0x55 and 0x77)
	51	* f1 d1 00 00 00 00 00 00 (1 data byte, 0xd1)
	52	*/
	53
	54	static void decode_packet(struct sr_dev_inst sdi, const uint8_t buf)
	55	{
	56	struct dev_context *devc;
	57	struct dmm_info *dmm;
	58	struct sr_datafeed_packet packet;
	59	struct sr_datafeed_analog analog;
	60	struct sr_analog_encoding encoding;
	61	struct sr_analog_meaning meaning;
	62	struct sr_analog_spec spec;
	63	float floatval;
	64	void *info;
	65	int ret;
	66
	67	devc = sdi->priv;
	68	dmm = (struct dmm_info *)sdi->driver;
	69	/* Note: digits/spec_digits will be overridden by the DMM parsers. */
	70	sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
	71	info = g_malloc(dmm->info_size);
	72
	73	/* Parse the protocol packet. */
	74	ret = dmm->packet_parse(buf, &floatval, &analog, info);
	75	if (ret != SR_OK) {
	76	sr_dbg("Invalid DMM packet, ignoring.");
	77	g_free(info);
	78	return;
	79	}
	80
	81	/* If this DMM needs additional handling, call the resp. function. */
	82	if (dmm->dmm_details)
	83	dmm->dmm_details(&analog, info);
	84
	85	g_free(info);
	86
	87	/* Send a sample packet with one analog value. */
	88	analog.meaning->channels = sdi->channels;
	89	analog.num_samples = 1;
	90	analog.data = &floatval;
	91	packet.type = SR_DF_ANALOG;
	92	packet.payload = &analog;
	93	sr_session_send(sdi, &packet);
	94
	95	sr_sw_limits_update_samples_read(&devc->limits, 1);
	96	}
	97
	98	static int hid_chip_init(struct sr_dev_inst *sdi, uint16_t baudrate)
	99	{
	100	int ret;
	101	uint8_t buf[5];
	102	struct sr_usb_dev_inst *usb;
	103
	104	usb = sdi->conn;
	105
	106	if (libusb_kernel_driver_active(usb->devhdl, 0) == 1) {
	107	ret = libusb_detach_kernel_driver(usb->devhdl, 0);
	108	if (ret < 0) {
	109	sr_err("Failed to detach kernel driver: %s.",
	110	libusb_error_name(ret));
	111	return SR_ERR;
	112	}
	113	}
	114
	115	if ((ret = libusb_claim_interface(usb->devhdl, 0)) < 0) {
	116	sr_err("Failed to claim interface 0: %s.",
	117	libusb_error_name(ret));
	118	return SR_ERR;
	119	}
	120
	121	/* Set data for the HID feature report (e.g. baudrate). */
	122	buf[0] = baudrate & 0xff; /* Baudrate, LSB */
	123	buf[1] = (baudrate >> 8) & 0xff; /* Baudrate, MSB */
	124	buf[2] = 0x00; /* Unknown/unused (?) */
	125	buf[3] = 0x00; /* Unknown/unused (?) */
	126	buf[4] = 0x03; /* Unknown, always 0x03. */
	127
	128	/* Send HID feature report to setup the baudrate/chip. */
	129	sr_dbg("Sending initial HID feature report.");
	130	sr_spew("HID init = 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x (%d baud)",
	131	buf[0], buf[1], buf[2], buf[3], buf[4], baudrate);
	132	ret = libusb_control_transfer(
	133	usb->devhdl, /* libusb device handle */
	134	LIBUSB_REQUEST_TYPE_CLASS \|
	135	LIBUSB_RECIPIENT_INTERFACE \|
	136	LIBUSB_ENDPOINT_OUT,
	137	9, /* bRequest: HID set_report */
	138	0x300, /* wValue: HID feature, report number 0 */
	139	0, /* wIndex: interface 0 */
	140	(unsigned char )&buf, / payload buffer */
	141	5, /* wLength: 5 bytes payload */
	142	1000 /* timeout (ms) */);
	143
	144	if (ret < 0) {
	145	sr_err("HID feature report error: %s.", libusb_error_name(ret));
	146	return SR_ERR;
	147	}
	148
	149	if (ret != 5) {
	150	/* TODO: Handle better by also sending the remaining bytes. */
	151	sr_err("Short packet: sent %d/5 bytes.", ret);
	152	return SR_ERR;
	153	}
	154
	155	return SR_OK;
	156	}
	157
	158	static void log_8byte_chunk(const uint8_t *buf)
	159	{
	160	sr_spew("8-byte chunk: %02x %02x %02x %02x %02x %02x %02x %02x "
	161	"(%d data bytes)", buf[0], buf[1], buf[2], buf[3],
	162	buf[4], buf[5], buf[6], buf[7], (buf[0] & 0x0f));
	163	}
	164
	165	static void log_dmm_packet(const uint8_t *buf)
	166	{
	167	GString *text;
	168
	169	text = sr_hexdump_new(buf, 14);
	170	sr_dbg("DMM packet: %s", text->str);
	171	sr_hexdump_free(text);
	172	}
	173
	174	static int get_and_handle_data(struct sr_dev_inst *sdi)
	175	{
	176	struct dev_context *devc;
	177	struct dmm_info *dmm;
	178	uint8_t buf[CHUNK_SIZE], *pbuf;
	179	int i, ret, len, num_databytes_in_chunk;
	180	struct sr_usb_dev_inst *usb;
	181
	182	devc = sdi->priv;
	183	dmm = (struct dmm_info *)sdi->driver;
	184	usb = sdi->conn;
	185	pbuf = devc->protocol_buf;
	186
	187	/* On the first run, we need to init the HID chip. */
	188	if (devc->first_run) {
	189	if ((ret = hid_chip_init(sdi, dmm->baudrate)) != SR_OK) {
	190	sr_err("HID chip init failed: %d.", ret);
	191	return SR_ERR;
	192	}
	193	memset(pbuf, 0x00, DMM_BUFSIZE);
	194	devc->first_run = FALSE;
	195	}
	196
	197	memset(&buf, 0x00, CHUNK_SIZE);
	198
	199	/* Get data from EP2 using an interrupt transfer. */
	200	ret = libusb_interrupt_transfer(
	201	usb->devhdl, /* libusb device handle */
	202	LIBUSB_ENDPOINT_IN \| 2, /* EP2, IN */
	203	(unsigned char )&buf, / receive buffer */
	204	CHUNK_SIZE, /* wLength */
	205	&len, /* actually received byte count */
	206	1000 /* timeout (ms) */);
	207
	208	if (ret < 0) {
	209	sr_err("USB receive error: %s.", libusb_error_name(ret));
	210	return SR_ERR;
	211	}
	212
	213	if (len != CHUNK_SIZE) {
	214	sr_err("Short packet: received %d/%d bytes.", len, CHUNK_SIZE);
	215	/* TODO: Print the bytes? */
	216	return SR_ERR;
	217	}
	218
	219	log_8byte_chunk((const uint8_t *)&buf);
	220
	221	/* If there are no data bytes just return (without error). */
	222	if (buf[0] == 0xf0)
	223	return SR_OK;
	224
	225	devc->bufoffset = 0;
	226
	227	/*
	228	* Append the 1-7 data bytes of this chunk to pbuf.
	229	*
	230	* Special case:
	231	* DMMs with Cyrustek ES51922 chip and UT71x DMMs need serial settings
	232	* of 7o1. The WCH CH9325 UART to USB/HID chip used in (some
	233	* versions of) the UNI-T UT-D04 cable however, will also send
	234	* the parity bit to the host in the 8-byte data chunks. This bit
	235	* is encoded in bit 7 of each of the 1-7 data bytes and must thus
	236	* be removed in order for the actual protocol parser to work properly.
	237	*/
	238	num_databytes_in_chunk = buf[0] & 0x0f;
	239	for (i = 0; i < num_databytes_in_chunk; i++, devc->buflen++) {
	240	pbuf[devc->buflen] = buf[1 + i];
	241	if ((dmm->packet_parse == sr_es519xx_19200_14b_parse) \|\|
	242	(dmm->packet_parse == sr_es519xx_19200_11b_parse) \|\|
	243	(dmm->packet_parse == sr_es519xx_2400_11b_parse) \|\|
	244	(dmm->packet_parse == sr_ut71x_parse)) {
	245	/* Mask off the parity bit. */
	246	pbuf[devc->buflen] &= ~(1 << 7);
	247	}
	248	}
	249
	250	/* Now look for packets in that data. */
	251	while ((devc->buflen - devc->bufoffset) >= dmm->packet_size) {
	252	if (dmm->packet_valid(pbuf + devc->bufoffset)) {
	253	log_dmm_packet(pbuf + devc->bufoffset);
	254	decode_packet(sdi, pbuf + devc->bufoffset);
	255	devc->bufoffset += dmm->packet_size;
	256	} else {
	257	devc->bufoffset++;
	258	}
	259	}
	260
	261	/* Move remaining bytes to beginning of buffer. */
	262	if (devc->bufoffset < devc->buflen)
	263	memmove(pbuf, pbuf + devc->bufoffset, devc->buflen - devc->bufoffset);
	264	devc->buflen -= devc->bufoffset;
	265
	266	return SR_OK;
	267	}
	268
	269	SR_PRIV int uni_t_dmm_receive_data(int fd, int revents, void *cb_data)
	270	{
	271	int ret;
	272	struct sr_dev_inst *sdi;
	273	struct dev_context *devc;
	274
	275	(void)fd;
	276	(void)revents;
	277
	278	sdi = cb_data;
	279	devc = sdi->priv;
	280
	281	if ((ret = get_and_handle_data(sdi)) != SR_OK)
	282	return FALSE;
	283
	284	/* Abort acquisition if we acquired enough samples. */
	285	if (sr_sw_limits_check(&devc->limits))
	286	sr_dev_acquisition_stop(sdi);
	287
	288	return TRUE;
	289	}