2 * This file is part of the libsigrok project.
4 * Copyright (C) 2012-2013 Uwe Hermann <uwe@hermann-uwe.de>
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.
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.
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
23 #include "libsigrok.h"
24 #include "libsigrok-internal.h"
28 * Driver for various UNI-T multimeters (and rebranded ones).
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.
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.
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
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.
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)
53 * Chips and serial settings used in UNI-T DMMs (and rebranded ones):
58 * - UNI-T UT60E: Fortune Semiconductor FS9721_LP3
62 * - UNI-T UT61D: Fortune Semiconductor FS9922-DMM4
63 * - UNI-T UT61E: Cyrustek ES51922
65 * - Voltcraft VC-820: Fortune Semiconductor FS9721_LP3
66 * - Voltcraft VC-840: Fortune Semiconductor FS9721_LP3
70 static void decode_packet(struct sr_dev_inst *sdi, int dmm, const uint8_t *buf,
73 struct dev_context *devc;
74 struct sr_datafeed_packet packet;
75 struct sr_datafeed_analog analog;
80 memset(&analog, 0, sizeof(struct sr_datafeed_analog));
82 /* Parse the protocol packet. */
83 ret = udmms[dmm].packet_parse(buf, &floatval, &analog, info);
85 sr_dbg("Invalid DMM packet, ignoring.");
89 /* If this DMM needs additional handling, call the resp. function. */
90 if (udmms[dmm].dmm_details)
91 udmms[dmm].dmm_details(&analog, info);
93 /* Send a sample packet with one analog value. */
94 analog.probes = sdi->probes;
95 analog.num_samples = 1;
96 analog.data = &floatval;
97 packet.type = SR_DF_ANALOG;
98 packet.payload = &analog;
99 sr_session_send(devc->cb_data, &packet);
101 /* Increase sample count. */
105 static int hid_chip_init(struct sr_dev_inst *sdi, uint16_t baudrate)
109 struct sr_usb_dev_inst *usb;
113 /* Detach kernel drivers which grabbed this device (if any). */
114 if (libusb_kernel_driver_active(usb->devhdl, 0) == 1) {
115 ret = libusb_detach_kernel_driver(usb->devhdl, 0);
117 sr_err("Failed to detach kernel driver: %s.",
118 libusb_error_name(ret));
121 sr_dbg("Successfully detached kernel driver.");
123 sr_dbg("No need to detach a kernel driver.");
126 /* Claim interface 0. */
127 if ((ret = libusb_claim_interface(usb->devhdl, 0)) < 0) {
128 sr_err("Failed to claim interface 0: %s.",
129 libusb_error_name(ret));
132 sr_dbg("Successfully claimed interface 0.");
134 /* Set data for the HID feature report (e.g. baudrate). */
135 buf[0] = baudrate & 0xff; /* Baudrate, LSB */
136 buf[1] = (baudrate >> 8) & 0xff; /* Baudrate, MSB */
137 buf[2] = 0x00; /* Unknown/unused (?) */
138 buf[3] = 0x00; /* Unknown/unused (?) */
139 buf[4] = 0x03; /* Unknown, always 0x03. */
141 /* Send HID feature report to setup the baudrate/chip. */
142 sr_dbg("Sending initial HID feature report.");
143 sr_spew("HID init = 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x (%d baud)",
144 buf[0], buf[1], buf[2], buf[3], buf[4], baudrate);
145 ret = libusb_control_transfer(
146 usb->devhdl, /* libusb device handle */
147 LIBUSB_REQUEST_TYPE_CLASS |
148 LIBUSB_RECIPIENT_INTERFACE |
150 9, /* bRequest: HID set_report */
151 0x300, /* wValue: HID feature, report number 0 */
152 0, /* wIndex: interface 0 */
153 (unsigned char *)&buf, /* payload buffer */
154 5, /* wLength: 5 bytes payload */
155 1000 /* timeout (ms) */);
158 sr_err("HID feature report error: %s.", libusb_error_name(ret));
163 /* TODO: Handle better by also sending the remaining bytes. */
164 sr_err("Short packet: sent %d/5 bytes.", ret);
168 sr_dbg("Successfully sent initial HID feature report.");
173 static void log_8byte_chunk(const uint8_t *buf)
175 sr_spew("8-byte chunk: %02x %02x %02x %02x %02x %02x %02x %02x "
176 "(%d data bytes)", buf[0], buf[1], buf[2], buf[3],
177 buf[4], buf[5], buf[6], buf[7], (buf[0] & 0x0f));
180 static void log_dmm_packet(const uint8_t *buf)
182 sr_dbg("DMM packet: %02x %02x %02x %02x %02x %02x %02x"
183 " %02x %02x %02x %02x %02x %02x %02x",
184 buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6],
185 buf[7], buf[8], buf[9], buf[10], buf[11], buf[12], buf[13]);
188 static int get_and_handle_data(struct sr_dev_inst *sdi, int dmm, void *info)
190 struct dev_context *devc;
191 uint8_t buf[CHUNK_SIZE], *pbuf;
192 int i, ret, len, num_databytes_in_chunk;
193 struct sr_usb_dev_inst *usb;
197 pbuf = devc->protocol_buf;
199 /* On the first run, we need to init the HID chip. */
200 if (devc->first_run) {
201 if ((ret = hid_chip_init(sdi, udmms[dmm].baudrate)) != SR_OK) {
202 sr_err("HID chip init failed: %d.", ret);
205 memset(pbuf, 0x00, DMM_BUFSIZE);
206 devc->first_run = FALSE;
209 memset(&buf, 0x00, CHUNK_SIZE);
211 /* Get data from EP2 using an interrupt transfer. */
212 ret = libusb_interrupt_transfer(
213 usb->devhdl, /* libusb device handle */
214 LIBUSB_ENDPOINT_IN | 2, /* EP2, IN */
215 (unsigned char *)&buf, /* receive buffer */
216 CHUNK_SIZE, /* wLength */
217 &len, /* actually received byte count */
218 1000 /* timeout (ms) */);
221 sr_err("USB receive error: %s.", libusb_error_name(ret));
225 if (len != CHUNK_SIZE) {
226 sr_err("Short packet: received %d/%d bytes.", len, CHUNK_SIZE);
227 /* TODO: Print the bytes? */
231 log_8byte_chunk((const uint8_t *)&buf);
233 /* If there are no data bytes just return (without error). */
239 /* Append the 1-7 data bytes of this chunk to pbuf. */
240 num_databytes_in_chunk = buf[0] & 0x0f;
241 for (i = 0; i < num_databytes_in_chunk; i++)
242 pbuf[devc->buflen++] = buf[1 + i];
244 /* Now look for packets in that data. */
245 while ((devc->buflen - devc->bufoffset) >= udmms[dmm].packet_size) {
246 if (udmms[dmm].packet_valid(pbuf + devc->bufoffset)) {
247 log_dmm_packet(pbuf + devc->bufoffset);
248 decode_packet(sdi, dmm, pbuf + devc->bufoffset, info);
249 devc->bufoffset += udmms[dmm].packet_size;
255 /* Move remaining bytes to beginning of buffer. */
256 for (i = 0; i < devc->buflen - devc->bufoffset; i++)
257 pbuf[i] = pbuf[devc->bufoffset + i];
258 devc->buflen -= devc->bufoffset;
263 static int receive_data(int fd, int revents, int dmm, void *info, void *cb_data)
266 struct sr_dev_inst *sdi;
267 struct dev_context *devc;
275 if ((ret = get_and_handle_data(sdi, dmm, info)) != SR_OK)
278 /* Abort acquisition if we acquired enough samples. */
279 if (devc->limit_samples && devc->num_samples >= devc->limit_samples) {
280 sr_info("Requested number of samples reached.");
281 sdi->driver->dev_acquisition_stop(sdi, cb_data);
287 #define RECEIVE_DATA(ID_UPPER, DMM_DRIVER) \
288 SR_PRIV int receive_data_##ID_UPPER(int fd, int revents, void *cb_data) { \
289 struct DMM_DRIVER##_info info; \
290 return receive_data(fd, revents, ID_UPPER, &info, cb_data); }
292 /* Driver-specific receive_data() wrappers */
293 RECEIVE_DATA(UNI_T_UT61D, fs9922)
294 RECEIVE_DATA(UNI_T_UT61E, es51922)
295 RECEIVE_DATA(VOLTCRAFT_VC820, fs9721)
296 RECEIVE_DATA(VOLTCRAFT_VC840, fs9721)