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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> |
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. |
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 | */ |
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; |
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 | |
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; |
87 | analog.data = &floatval; | |
5faebab2 | 88 | packet.type = SR_DF_ANALOG_OLD; |
79081ec8 | 89 | packet.payload = &analog; |
695dc859 | 90 | sr_session_send(sdi, &packet); |
79081ec8 | 91 | |
8a63a406 | 92 | sr_sw_limits_update_samples_read(&devc->limits, 1); |
79081ec8 UH |
93 | } |
94 | ||
3ece1dff | 95 | static int hid_chip_init(struct sr_dev_inst *sdi, uint16_t baudrate) |
79081ec8 UH |
96 | { |
97 | int ret; | |
98 | uint8_t buf[5]; | |
3ece1dff | 99 | struct sr_usb_dev_inst *usb; |
79081ec8 | 100 | |
3ece1dff UH |
101 | usb = sdi->conn; |
102 | ||
79081ec8 | 103 | /* Detach kernel drivers which grabbed this device (if any). */ |
3ece1dff UH |
104 | if (libusb_kernel_driver_active(usb->devhdl, 0) == 1) { |
105 | ret = libusb_detach_kernel_driver(usb->devhdl, 0); | |
79081ec8 | 106 | if (ret < 0) { |
d4928d71 PS |
107 | sr_err("Failed to detach kernel driver: %s.", |
108 | libusb_error_name(ret)); | |
79081ec8 UH |
109 | return SR_ERR; |
110 | } | |
111 | sr_dbg("Successfully detached kernel driver."); | |
112 | } else { | |
113 | sr_dbg("No need to detach a kernel driver."); | |
114 | } | |
115 | ||
116 | /* Claim interface 0. */ | |
3ece1dff | 117 | if ((ret = libusb_claim_interface(usb->devhdl, 0)) < 0) { |
d4928d71 PS |
118 | sr_err("Failed to claim interface 0: %s.", |
119 | libusb_error_name(ret)); | |
79081ec8 UH |
120 | return SR_ERR; |
121 | } | |
122 | sr_dbg("Successfully claimed interface 0."); | |
123 | ||
bc653a56 | 124 | /* Set data for the HID feature report (e.g. baudrate). */ |
79081ec8 UH |
125 | buf[0] = baudrate & 0xff; /* Baudrate, LSB */ |
126 | buf[1] = (baudrate >> 8) & 0xff; /* Baudrate, MSB */ | |
127 | buf[2] = 0x00; /* Unknown/unused (?) */ | |
128 | buf[3] = 0x00; /* Unknown/unused (?) */ | |
129 | buf[4] = 0x03; /* Unknown, always 0x03. */ | |
130 | ||
131 | /* Send HID feature report to setup the baudrate/chip. */ | |
132 | sr_dbg("Sending initial HID feature report."); | |
133 | sr_spew("HID init = 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x (%d baud)", | |
134 | buf[0], buf[1], buf[2], buf[3], buf[4], baudrate); | |
135 | ret = libusb_control_transfer( | |
3ece1dff | 136 | usb->devhdl, /* libusb device handle */ |
79081ec8 UH |
137 | LIBUSB_REQUEST_TYPE_CLASS | |
138 | LIBUSB_RECIPIENT_INTERFACE | | |
139 | LIBUSB_ENDPOINT_OUT, | |
140 | 9, /* bRequest: HID set_report */ | |
141 | 0x300, /* wValue: HID feature, report number 0 */ | |
142 | 0, /* wIndex: interface 0 */ | |
143 | (unsigned char *)&buf, /* payload buffer */ | |
144 | 5, /* wLength: 5 bytes payload */ | |
145 | 1000 /* timeout (ms) */); | |
146 | ||
147 | if (ret < 0) { | |
d4928d71 | 148 | sr_err("HID feature report error: %s.", libusb_error_name(ret)); |
79081ec8 UH |
149 | return SR_ERR; |
150 | } | |
151 | ||
152 | if (ret != 5) { | |
153 | /* TODO: Handle better by also sending the remaining bytes. */ | |
154 | sr_err("Short packet: sent %d/5 bytes.", ret); | |
155 | return SR_ERR; | |
156 | } | |
157 | ||
158 | sr_dbg("Successfully sent initial HID feature report."); | |
159 | ||
160 | return SR_OK; | |
161 | } | |
162 | ||
163 | static void log_8byte_chunk(const uint8_t *buf) | |
164 | { | |
165 | sr_spew("8-byte chunk: %02x %02x %02x %02x %02x %02x %02x %02x " | |
166 | "(%d data bytes)", buf[0], buf[1], buf[2], buf[3], | |
167 | buf[4], buf[5], buf[6], buf[7], (buf[0] & 0x0f)); | |
168 | } | |
169 | ||
170 | static void log_dmm_packet(const uint8_t *buf) | |
171 | { | |
172 | sr_dbg("DMM packet: %02x %02x %02x %02x %02x %02x %02x" | |
173 | " %02x %02x %02x %02x %02x %02x %02x", | |
174 | buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], | |
175 | buf[7], buf[8], buf[9], buf[10], buf[11], buf[12], buf[13]); | |
176 | } | |
177 | ||
f0540611 | 178 | static int get_and_handle_data(struct sr_dev_inst *sdi) |
79081ec8 | 179 | { |
79081ec8 | 180 | struct dev_context *devc; |
f0540611 | 181 | struct dmm_info *dmm; |
bc653a56 | 182 | uint8_t buf[CHUNK_SIZE], *pbuf; |
79081ec8 | 183 | int i, ret, len, num_databytes_in_chunk; |
3ece1dff | 184 | struct sr_usb_dev_inst *usb; |
79081ec8 | 185 | |
79081ec8 | 186 | devc = sdi->priv; |
f0540611 | 187 | dmm = (struct dmm_info *)sdi->driver; |
3ece1dff | 188 | usb = sdi->conn; |
79081ec8 UH |
189 | pbuf = devc->protocol_buf; |
190 | ||
191 | /* On the first run, we need to init the HID chip. */ | |
bc653a56 | 192 | if (devc->first_run) { |
f0540611 | 193 | if ((ret = hid_chip_init(sdi, dmm->baudrate)) != SR_OK) { |
79081ec8 | 194 | sr_err("HID chip init failed: %d.", ret); |
bc653a56 | 195 | return SR_ERR; |
79081ec8 | 196 | } |
bc653a56 UH |
197 | memset(pbuf, 0x00, DMM_BUFSIZE); |
198 | devc->first_run = FALSE; | |
79081ec8 UH |
199 | } |
200 | ||
201 | memset(&buf, 0x00, CHUNK_SIZE); | |
202 | ||
203 | /* Get data from EP2 using an interrupt transfer. */ | |
204 | ret = libusb_interrupt_transfer( | |
3ece1dff | 205 | usb->devhdl, /* libusb device handle */ |
79081ec8 UH |
206 | LIBUSB_ENDPOINT_IN | 2, /* EP2, IN */ |
207 | (unsigned char *)&buf, /* receive buffer */ | |
208 | CHUNK_SIZE, /* wLength */ | |
209 | &len, /* actually received byte count */ | |
210 | 1000 /* timeout (ms) */); | |
211 | ||
212 | if (ret < 0) { | |
d4928d71 | 213 | sr_err("USB receive error: %s.", libusb_error_name(ret)); |
bc653a56 | 214 | return SR_ERR; |
79081ec8 UH |
215 | } |
216 | ||
217 | if (len != CHUNK_SIZE) { | |
218 | sr_err("Short packet: received %d/%d bytes.", len, CHUNK_SIZE); | |
219 | /* TODO: Print the bytes? */ | |
bc653a56 | 220 | return SR_ERR; |
79081ec8 UH |
221 | } |
222 | ||
223 | log_8byte_chunk((const uint8_t *)&buf); | |
224 | ||
bc653a56 UH |
225 | /* If there are no data bytes just return (without error). */ |
226 | if (buf[0] == 0xf0) | |
227 | return SR_OK; | |
228 | ||
229 | devc->bufoffset = 0; | |
230 | ||
4d7ddff7 UH |
231 | /* |
232 | * Append the 1-7 data bytes of this chunk to pbuf. | |
233 | * | |
234 | * Special case: | |
8769478c UH |
235 | * DMMs with Cyrustek ES51922 chip and UT71x DMMs need serial settings |
236 | * of 7o1. The WCH CH9325 UART to USB/HID chip used in (some | |
4d7ddff7 UH |
237 | * versions of) the UNI-T UT-D04 cable however, will also send |
238 | * the parity bit to the host in the 8-byte data chunks. This bit | |
239 | * is encoded in bit 7 of each of the 1-7 data bytes and must thus | |
8769478c | 240 | * be removed in order for the actual protocol parser to work properly. |
4d7ddff7 | 241 | */ |
bc653a56 | 242 | num_databytes_in_chunk = buf[0] & 0x0f; |
4d7ddff7 UH |
243 | for (i = 0; i < num_databytes_in_chunk; i++, devc->buflen++) { |
244 | pbuf[devc->buflen] = buf[1 + i]; | |
f0540611 ML |
245 | if ((dmm->packet_parse == sr_es519xx_19200_14b_parse) || |
246 | (dmm->packet_parse == sr_ut71x_parse)) { | |
8769478c | 247 | /* Mask off the parity bit. */ |
4d7ddff7 | 248 | pbuf[devc->buflen] &= ~(1 << 7); |
8769478c | 249 | } |
4d7ddff7 | 250 | } |
bc653a56 UH |
251 | |
252 | /* Now look for packets in that data. */ | |
f0540611 ML |
253 | while ((devc->buflen - devc->bufoffset) >= dmm->packet_size) { |
254 | if (dmm->packet_valid(pbuf + devc->bufoffset)) { | |
bc653a56 | 255 | log_dmm_packet(pbuf + devc->bufoffset); |
f0540611 ML |
256 | decode_packet(sdi, pbuf + devc->bufoffset); |
257 | devc->bufoffset += dmm->packet_size; | |
bc653a56 UH |
258 | } else { |
259 | devc->bufoffset++; | |
79081ec8 | 260 | } |
bc653a56 | 261 | } |
79081ec8 | 262 | |
bc653a56 UH |
263 | /* Move remaining bytes to beginning of buffer. */ |
264 | for (i = 0; i < devc->buflen - devc->bufoffset; i++) | |
265 | pbuf[i] = pbuf[devc->bufoffset + i]; | |
266 | devc->buflen -= devc->bufoffset; | |
79081ec8 | 267 | |
bc653a56 UH |
268 | return SR_OK; |
269 | } | |
270 | ||
f0540611 | 271 | SR_PRIV int uni_t_dmm_receive_data(int fd, int revents, void *cb_data) |
bc653a56 UH |
272 | { |
273 | int ret; | |
274 | struct sr_dev_inst *sdi; | |
275 | struct dev_context *devc; | |
c8852687 | 276 | |
bc653a56 UH |
277 | (void)fd; |
278 | (void)revents; | |
c8852687 | 279 | |
bc653a56 UH |
280 | sdi = cb_data; |
281 | devc = sdi->priv; | |
c8852687 | 282 | |
f0540611 | 283 | if ((ret = get_and_handle_data(sdi)) != SR_OK) |
bc653a56 | 284 | return FALSE; |
79081ec8 UH |
285 | |
286 | /* Abort acquisition if we acquired enough samples. */ | |
8a63a406 | 287 | if (sr_sw_limits_check(&devc->limits)) |
695dc859 | 288 | sdi->driver->dev_acquisition_stop(sdi); |
c5ffac41 | 289 | |
79081ec8 UH |
290 | return TRUE; |
291 | } |