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

/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2012 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 <string.h>
#include <glib.h>
#include "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-D01 RS232 cable.
 *
 * This driver is meant to support all three cables, and various DMMs that
 * can be attached to a PC via these cables. Currently only the UT-D04 cable
 * (new version) is supported.
 *
 * 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)
 *
 * Chips and serial settings used in UNI-T DMMs (and rebranded ones):
 *  - UNI-T UT108: ?
 *  - UNI-T UT109: ?
 *  - UNI-T UT30A: ?
 *  - UNI-T UT30E: ?
 *  - UNI-T UT60E: Fortune Semiconductor FS9721_LP3
 *  - UNI-T UT60G: ?
 *  - UNI-T UT61B: ?
 *  - UNI-T UT61C: ?
 *  - UNI-T UT61D: Fortune Semiconductor FS9922-DMM4
 *  - UNI-T UT61E: Cyrustek ES51922
 *  - UNI-T UT70B: ?
 *  - Voltcraft VC-820: Fortune Semiconductor FS9721_LP3
 *  - Voltcraft VC-840: Fortune Semiconductor FS9721_LP3
 *  - ...
 */

static void decode_packet(struct sr_dev_inst *sdi, int dmm, const uint8_t *buf)
{
	struct sr_datafeed_packet packet;
	struct sr_datafeed_analog analog;
	struct dev_context *devc;
	struct fs9721_info info;
	float floatval;
	int ret;

	devc = sdi->priv;
	memset(&analog, 0, sizeof(struct sr_datafeed_analog));

	/* Parse the protocol packet. */
	ret = SR_ERR;
	if (dmm == UNI_T_UT61D)
		ret = sr_dmm_parse_fs9922(buf, &floatval, &analog);
	else if (dmm == VOLTCRAFT_VC820)
		ret = sr_fs9721_parse(buf, &floatval, &analog, &info);
	if (ret != SR_OK) {
		sr_err("Invalid DMM packet, ignoring.");
		return;
	}

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

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

static int hid_chip_init(struct dev_context *devc, uint16_t baudrate)
{
	int ret;
	uint8_t buf[5];

	/* Detach kernel drivers which grabbed this device (if any). */
	if (libusb_kernel_driver_active(devc->usb->devhdl, 0) == 1) {
		ret = libusb_detach_kernel_driver(devc->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(devc->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.");

	/* Baudrate example: 19230 baud -> HEX(19230) == 0x4b1e */
	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(
		devc->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 uni_t_dmm_receive_data(int fd, int revents, int dmm, void *cb_data)
{
	struct sr_dev_inst *sdi;
	struct dev_context *devc;
	int i, ret, len, num_databytes_in_chunk;
	uint8_t buf[CHUNK_SIZE];
	uint8_t *pbuf;
	static gboolean first_run = TRUE, synced_on_first_packet = FALSE;
	static uint64_t data_byte_counter = 0;

	(void)fd;
	(void)revents;

	sdi = cb_data;
	devc = sdi->priv;

	pbuf = devc->protocol_buf;

	/* On the first run, we need to init the HID chip. */
	if (first_run) {
		/* TODO: The baudrate is DMM-specific (UT61D: 19230). */
		if ((ret = hid_chip_init(devc, 19230)) != SR_OK) {
			sr_err("HID chip init failed: %d.", ret);
			return FALSE;
		}
		memset(pbuf, 0x00, NUM_DATA_BYTES);
		first_run = FALSE;
	}

	memset(&buf, 0x00, CHUNK_SIZE);

	/* Get data from EP2 using an interrupt transfer. */
	ret = libusb_interrupt_transfer(
		devc->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 FALSE;
	}

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

	log_8byte_chunk((const uint8_t *)&buf);

	if (buf[0] != 0xf0) {
		/* First time: Synchronize to the start of a packet. */
		if (!synced_on_first_packet) {
			if (dmm == UNI_T_UT61D) {
				/* Valid packets start with '+' or '-'. */
				if ((buf[1] != '+') && buf[1] != '-')
					return TRUE;
			} else if (dmm == VOLTCRAFT_VC820) {
				/* Valid packets have 0x1 as high nibble. */
				if (!sr_fs9721_is_packet_start(buf[1]))
					return TRUE;
			}
			synced_on_first_packet = TRUE;
			sr_spew("Successfully synchronized on first packet.");
		}

		num_databytes_in_chunk = buf[0] & 0x0f;
		for (i = 0; i < num_databytes_in_chunk; i++)
			pbuf[data_byte_counter++] = buf[1 + i];

		/* TODO: Handle > 14 bytes in pbuf? Can this happen? */
		if (data_byte_counter == NUM_DATA_BYTES) {
			log_dmm_packet(pbuf);
			data_byte_counter = 0;
			if (dmm == VOLTCRAFT_VC820) {
				if (!sr_fs9721_packet_valid(pbuf)) {
					sr_err("Invalid packet.");
					return TRUE;
				}
			}
			decode_packet(sdi, dmm, pbuf);
			memset(pbuf, 0x00, NUM_DATA_BYTES);
		}
	}

	/* 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);
	}

	return TRUE;
}

SR_PRIV int uni_t_ut61d_receive_data(int fd, int revents, void *cb_data)
{
	return uni_t_dmm_receive_data(fd, revents, UNI_T_UT61D, cb_data);
}

SR_PRIV int voltcraft_vc820_receive_data(int fd, int revents, void *cb_data)
{
	return uni_t_dmm_receive_data(fd, revents, VOLTCRAFT_VC820, cb_data);
}
Commit	Line	Data
79081ec8 UH	1	/*
	2	* This file is part of the sigrok project.
	3	*
	4	* Copyright (C) 2012 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, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
	21	#include <string.h>
	22	#include <glib.h>
	23	#include "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-D01 RS232 cable.
	34	*
	35	* This driver is meant to support all three 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.
	38	*
	39	* The data for one DMM packet (e.g. 14 bytes if the respective DMM uses a
	40	* Fortune Semiconductor FS9922-DMM4 chip) is spread across multiple
	41	* 8-byte chunks.
	42	*
	43	* An 8-byte chunk looks like this:
	44	* - Byte 0: 0xfz, where z is the number of actual data bytes in this chunk.
	45	* - Bytes 1-7: z data bytes, the rest of the bytes should be ignored.
	46	*
	47	* Example:
	48	* f0 00 00 00 00 00 00 00 (no data bytes)
	49	* f2 55 77 00 00 00 00 00 (2 data bytes, 0x55 and 0x77)
	50	* f1 d1 00 00 00 00 00 00 (1 data byte, 0xd1)
	51	*
	52	* Chips and serial settings used in UNI-T DMMs (and rebranded ones):
	53	* - UNI-T UT108: ?
	54	* - UNI-T UT109: ?
	55	* - UNI-T UT30A: ?
	56	* - UNI-T UT30E: ?
	57	* - UNI-T UT60E: Fortune Semiconductor FS9721_LP3
	58	* - UNI-T UT60G: ?
	59	* - UNI-T UT61B: ?
	60	* - UNI-T UT61C: ?
	61	* - UNI-T UT61D: Fortune Semiconductor FS9922-DMM4
	62	* - UNI-T UT61E: Cyrustek ES51922
	63	* - UNI-T UT70B: ?
	64	* - Voltcraft VC-820: Fortune Semiconductor FS9721_LP3
65	* - Voltcraft VC-840: Fortune Semiconductor FS9721_LP3
66	* - ...
67	*/
68
69e19dd7	69	static void decode_packet(struct sr_dev_inst sdi, int dmm, const uint8_t buf)
79081ec8 UH	70	{
	71	struct sr_datafeed_packet packet;
	72	struct sr_datafeed_analog analog;
69e19dd7	73	struct dev_context *devc;
8c1adf37	74	struct fs9721_info info;
79081ec8 UH	75	float floatval;
	76	int ret;
	77
69e19dd7	78	devc = sdi->priv;
79081ec8 UH	79	memset(&analog, 0, sizeof(struct sr_datafeed_analog));
	80
	81	/* Parse the protocol packet. */
811155da	82	ret = SR_ERR;
fdbcb86d UH	83	if (dmm == UNI_T_UT61D)
	84	ret = sr_dmm_parse_fs9922(buf, &floatval, &analog);
	85	else if (dmm == VOLTCRAFT_VC820)
8c1adf37	86	ret = sr_fs9721_parse(buf, &floatval, &analog, &info);
fdbcb86d	87	if (ret != SR_OK) {
79081ec8 UH	88	sr_err("Invalid DMM packet, ignoring.");
	89	return;
	90	}
	91
	92	/* Send a sample packet with one analog value. */
69e19dd7	93	analog.probes = sdi->probes;
79081ec8 UH	94	analog.num_samples = 1;
	95	analog.data = &floatval;
	96	packet.type = SR_DF_ANALOG;
	97	packet.payload = &analog;
	98	sr_session_send(devc->cb_data, &packet);
	99
	100	/* Increase sample count. */
	101	devc->num_samples++;
	102	}
	103
	104	static int hid_chip_init(struct dev_context *devc, uint16_t baudrate)
	105	{
	106	int ret;
	107	uint8_t buf[5];
	108
	109	/* Detach kernel drivers which grabbed this device (if any). */
	110	if (libusb_kernel_driver_active(devc->usb->devhdl, 0) == 1) {
	111	ret = libusb_detach_kernel_driver(devc->usb->devhdl, 0);
	112	if (ret < 0) {
d4928d71 PS	113	sr_err("Failed to detach kernel driver: %s.",
d4928d71 PS	114	libusb_error_name(ret));
79081ec8 UH	115	return SR_ERR;
	116	}
	117	sr_dbg("Successfully detached kernel driver.");
	118	} else {
	119	sr_dbg("No need to detach a kernel driver.");
	120	}
	121
	122	/* Claim interface 0. */
	123	if ((ret = libusb_claim_interface(devc->usb->devhdl, 0)) < 0) {
d4928d71 PS	124	sr_err("Failed to claim interface 0: %s.",
d4928d71 PS	125	libusb_error_name(ret));
79081ec8 UH	126	return SR_ERR;
	127	}
	128	sr_dbg("Successfully claimed interface 0.");
	129
	130	/* Baudrate example: 19230 baud -> HEX(19230) == 0x4b1e */
	131	buf[0] = baudrate & 0xff; /* Baudrate, LSB */
	132	buf[1] = (baudrate >> 8) & 0xff; /* Baudrate, MSB */
	133	buf[2] = 0x00; /* Unknown/unused (?) */
	134	buf[3] = 0x00; /* Unknown/unused (?) */
	135	buf[4] = 0x03; /* Unknown, always 0x03. */
	136
	137	/* Send HID feature report to setup the baudrate/chip. */
	138	sr_dbg("Sending initial HID feature report.");
	139	sr_spew("HID init = 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x (%d baud)",
	140	buf[0], buf[1], buf[2], buf[3], buf[4], baudrate);
	141	ret = libusb_control_transfer(
	142	devc->usb->devhdl, /* libusb device handle */
	143	LIBUSB_REQUEST_TYPE_CLASS \|
	144	LIBUSB_RECIPIENT_INTERFACE \|
	145	LIBUSB_ENDPOINT_OUT,
	146	9, /* bRequest: HID set_report */
	147	0x300, /* wValue: HID feature, report number 0 */
	148	0, /* wIndex: interface 0 */
	149	(unsigned char )&buf, / payload buffer */
	150	5, /* wLength: 5 bytes payload */
	151	1000 /* timeout (ms) */);
	152
	153	if (ret < 0) {
d4928d71	154	sr_err("HID feature report error: %s.", libusb_error_name(ret));
79081ec8 UH	155	return SR_ERR;
	156	}
	157
	158	if (ret != 5) {
	159	/* TODO: Handle better by also sending the remaining bytes. */
	160	sr_err("Short packet: sent %d/5 bytes.", ret);
	161	return SR_ERR;
	162	}
	163
	164	sr_dbg("Successfully sent initial HID feature report.");
	165
	166	return SR_OK;
	167	}
	168
	169	static void log_8byte_chunk(const uint8_t *buf)
	170	{
	171	sr_spew("8-byte chunk: %02x %02x %02x %02x %02x %02x %02x %02x "
	172	"(%d data bytes)", buf[0], buf[1], buf[2], buf[3],
	173	buf[4], buf[5], buf[6], buf[7], (buf[0] & 0x0f));
	174	}
	175
	176	static void log_dmm_packet(const uint8_t *buf)
	177	{
	178	sr_dbg("DMM packet: %02x %02x %02x %02x %02x %02x %02x"
	179	" %02x %02x %02x %02x %02x %02x %02x",
	180	buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6],
	181	buf[7], buf[8], buf[9], buf[10], buf[11], buf[12], buf[13]);
	182	}
	183
fdbcb86d	184	static int uni_t_dmm_receive_data(int fd, int revents, int dmm, void *cb_data)
79081ec8 UH	185	{
	186	struct sr_dev_inst *sdi;
	187	struct dev_context *devc;
	188	int i, ret, len, num_databytes_in_chunk;
	189	uint8_t buf[CHUNK_SIZE];
	190	uint8_t *pbuf;
	191	static gboolean first_run = TRUE, synced_on_first_packet = FALSE;
	192	static uint64_t data_byte_counter = 0;
	193
	194	(void)fd;
	195	(void)revents;
	196
	197	sdi = cb_data;
	198	devc = sdi->priv;
	199
	200	pbuf = devc->protocol_buf;
	201
	202	/* On the first run, we need to init the HID chip. */
	203	if (first_run) {
	204	/* TODO: The baudrate is DMM-specific (UT61D: 19230). */
	205	if ((ret = hid_chip_init(devc, 19230)) != SR_OK) {
	206	sr_err("HID chip init failed: %d.", ret);
	207	return FALSE;
	208	}
	209	memset(pbuf, 0x00, NUM_DATA_BYTES);
	210	first_run = FALSE;
	211	}
	212
	213	memset(&buf, 0x00, CHUNK_SIZE);
	214
	215	/* Get data from EP2 using an interrupt transfer. */
	216	ret = libusb_interrupt_transfer(
	217	devc->usb->devhdl, /* libusb device handle */
	218	LIBUSB_ENDPOINT_IN \| 2, /* EP2, IN */
	219	(unsigned char )&buf, / receive buffer */
	220	CHUNK_SIZE, /* wLength */
	221	&len, /* actually received byte count */
	222	1000 /* timeout (ms) */);
	223
	224	if (ret < 0) {
d4928d71	225	sr_err("USB receive error: %s.", libusb_error_name(ret));
79081ec8 UH	226	return FALSE;
	227	}
	228
	229	if (len != CHUNK_SIZE) {
	230	sr_err("Short packet: received %d/%d bytes.", len, CHUNK_SIZE);
	231	/* TODO: Print the bytes? */
	232	return FALSE;
	233	}
	234
	235	log_8byte_chunk((const uint8_t *)&buf);
	236
	237	if (buf[0] != 0xf0) {
	238	/* First time: Synchronize to the start of a packet. */
	239	if (!synced_on_first_packet) {
fdbcb86d UH	240	if (dmm == UNI_T_UT61D) {
	241	/* Valid packets start with '+' or '-'. */
	242	if ((buf[1] != '+') && buf[1] != '-')
	243	return TRUE;
	244	} else if (dmm == VOLTCRAFT_VC820) {
	245	/* Valid packets have 0x1 as high nibble. */
8c1adf37	246	if (!sr_fs9721_is_packet_start(buf[1]))
fdbcb86d UH	247	return TRUE;
fdbcb86d UH	248	}
79081ec8 UH	249	synced_on_first_packet = TRUE;
	250	sr_spew("Successfully synchronized on first packet.");
	251	}
	252
	253	num_databytes_in_chunk = buf[0] & 0x0f;
	254	for (i = 0; i < num_databytes_in_chunk; i++)
	255	pbuf[data_byte_counter++] = buf[1 + i];
	256
	257	/* TODO: Handle > 14 bytes in pbuf? Can this happen? */
	258	if (data_byte_counter == NUM_DATA_BYTES) {
	259	log_dmm_packet(pbuf);
	260	data_byte_counter = 0;
9d8fde40 UH	261	if (dmm == VOLTCRAFT_VC820) {
	262	if (!sr_fs9721_packet_valid(pbuf)) {
	263	sr_err("Invalid packet.");
	264	return TRUE;
	265	}
8c1adf37	266	}
69e19dd7	267	decode_packet(sdi, dmm, pbuf);
79081ec8 UH	268	memset(pbuf, 0x00, NUM_DATA_BYTES);
	269	}
	270	}
	271
	272	/* Abort acquisition if we acquired enough samples. */
35e199da	273	if (devc->limit_samples && devc->num_samples >= devc->limit_samples) {
79081ec8 UH	274	sr_info("Requested number of samples reached.");
	275	sdi->driver->dev_acquisition_stop(sdi, cb_data);
	276	}
	277
	278	return TRUE;
	279	}
fdbcb86d UH	280
	281	SR_PRIV int uni_t_ut61d_receive_data(int fd, int revents, void *cb_data)
	282	{
	283	return uni_t_dmm_receive_data(fd, revents, UNI_T_UT61D, cb_data);
	284	}
	285
	286	SR_PRIV int voltcraft_vc820_receive_data(int fd, int revents, void *cb_data)
	287	{
	288	return uni_t_dmm_receive_data(fd, revents, VOLTCRAFT_VC820, cb_data);
	289	}