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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, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include <config.h> | |
22 | #include <string.h> | |
23 | #include <glib.h> | |
24 | #include <libsigrok/libsigrok.h> | |
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. | |
34 | * - The UT-D02 RS232 cable. | |
35 | * | |
36 | * This driver is meant to support all USB/HID cables, and various DMMs that | |
37 | * can be attached to a PC via these cables. Currently only the UT-D04 cable | |
38 | * (new version) is supported/tested. | |
39 | * The UT-D02 RS232 cable is handled by the 'serial-dmm' driver. | |
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) | |
53 | */ | |
54 | ||
55 | static void decode_packet(struct sr_dev_inst *sdi, const uint8_t *buf) | |
56 | { | |
57 | struct dev_context *devc; | |
58 | struct dmm_info *dmm; | |
59 | struct sr_datafeed_packet packet; | |
60 | struct sr_datafeed_analog_old analog; | |
61 | float floatval; | |
62 | void *info; | |
63 | int ret; | |
64 | ||
65 | devc = sdi->priv; | |
66 | dmm = (struct dmm_info *)sdi->driver; | |
67 | memset(&analog, 0, sizeof(struct sr_datafeed_analog_old)); | |
68 | info = g_malloc(dmm->info_size); | |
69 | ||
70 | /* Parse the protocol packet. */ | |
71 | ret = dmm->packet_parse(buf, &floatval, &analog, info); | |
72 | if (ret != SR_OK) { | |
73 | sr_dbg("Invalid DMM packet, ignoring."); | |
74 | g_free(info); | |
75 | return; | |
76 | } | |
77 | ||
78 | /* If this DMM needs additional handling, call the resp. function. */ | |
79 | if (dmm->dmm_details) | |
80 | dmm->dmm_details(&analog, info); | |
81 | ||
82 | g_free(info); | |
83 | ||
84 | /* Send a sample packet with one analog value. */ | |
85 | analog.channels = sdi->channels; | |
86 | analog.num_samples = 1; | |
87 | analog.data = &floatval; | |
88 | packet.type = SR_DF_ANALOG_OLD; | |
89 | packet.payload = &analog; | |
90 | sr_session_send(sdi, &packet); | |
91 | ||
92 | /* Increase sample count. */ | |
93 | devc->num_samples++; | |
94 | } | |
95 | ||
96 | static int hid_chip_init(struct sr_dev_inst *sdi, uint16_t baudrate) | |
97 | { | |
98 | int ret; | |
99 | uint8_t buf[5]; | |
100 | struct sr_usb_dev_inst *usb; | |
101 | ||
102 | usb = sdi->conn; | |
103 | ||
104 | /* Detach kernel drivers which grabbed this device (if any). */ | |
105 | if (libusb_kernel_driver_active(usb->devhdl, 0) == 1) { | |
106 | ret = libusb_detach_kernel_driver(usb->devhdl, 0); | |
107 | if (ret < 0) { | |
108 | sr_err("Failed to detach kernel driver: %s.", | |
109 | libusb_error_name(ret)); | |
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. */ | |
118 | if ((ret = libusb_claim_interface(usb->devhdl, 0)) < 0) { | |
119 | sr_err("Failed to claim interface 0: %s.", | |
120 | libusb_error_name(ret)); | |
121 | return SR_ERR; | |
122 | } | |
123 | sr_dbg("Successfully claimed interface 0."); | |
124 | ||
125 | /* Set data for the HID feature report (e.g. baudrate). */ | |
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( | |
137 | usb->devhdl, /* libusb device handle */ | |
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) { | |
149 | sr_err("HID feature report error: %s.", libusb_error_name(ret)); | |
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 | ||
179 | static int get_and_handle_data(struct sr_dev_inst *sdi) | |
180 | { | |
181 | struct dev_context *devc; | |
182 | struct dmm_info *dmm; | |
183 | uint8_t buf[CHUNK_SIZE], *pbuf; | |
184 | int i, ret, len, num_databytes_in_chunk; | |
185 | struct sr_usb_dev_inst *usb; | |
186 | ||
187 | devc = sdi->priv; | |
188 | dmm = (struct dmm_info *)sdi->driver; | |
189 | usb = sdi->conn; | |
190 | pbuf = devc->protocol_buf; | |
191 | ||
192 | /* On the first run, we need to init the HID chip. */ | |
193 | if (devc->first_run) { | |
194 | if ((ret = hid_chip_init(sdi, dmm->baudrate)) != SR_OK) { | |
195 | sr_err("HID chip init failed: %d.", ret); | |
196 | return SR_ERR; | |
197 | } | |
198 | memset(pbuf, 0x00, DMM_BUFSIZE); | |
199 | devc->first_run = FALSE; | |
200 | } | |
201 | ||
202 | memset(&buf, 0x00, CHUNK_SIZE); | |
203 | ||
204 | /* Get data from EP2 using an interrupt transfer. */ | |
205 | ret = libusb_interrupt_transfer( | |
206 | usb->devhdl, /* libusb device handle */ | |
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) { | |
214 | sr_err("USB receive error: %s.", libusb_error_name(ret)); | |
215 | return SR_ERR; | |
216 | } | |
217 | ||
218 | if (len != CHUNK_SIZE) { | |
219 | sr_err("Short packet: received %d/%d bytes.", len, CHUNK_SIZE); | |
220 | /* TODO: Print the bytes? */ | |
221 | return SR_ERR; | |
222 | } | |
223 | ||
224 | log_8byte_chunk((const uint8_t *)&buf); | |
225 | ||
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 | ||
232 | /* | |
233 | * Append the 1-7 data bytes of this chunk to pbuf. | |
234 | * | |
235 | * Special case: | |
236 | * DMMs with Cyrustek ES51922 chip and UT71x DMMs need serial settings | |
237 | * of 7o1. The WCH CH9325 UART to USB/HID chip used in (some | |
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 | |
241 | * be removed in order for the actual protocol parser to work properly. | |
242 | */ | |
243 | num_databytes_in_chunk = buf[0] & 0x0f; | |
244 | for (i = 0; i < num_databytes_in_chunk; i++, devc->buflen++) { | |
245 | pbuf[devc->buflen] = buf[1 + i]; | |
246 | if ((dmm->packet_parse == sr_es519xx_19200_14b_parse) || | |
247 | (dmm->packet_parse == sr_ut71x_parse)) { | |
248 | /* Mask off the parity bit. */ | |
249 | pbuf[devc->buflen] &= ~(1 << 7); | |
250 | } | |
251 | } | |
252 | ||
253 | /* Now look for packets in that data. */ | |
254 | while ((devc->buflen - devc->bufoffset) >= dmm->packet_size) { | |
255 | if (dmm->packet_valid(pbuf + devc->bufoffset)) { | |
256 | log_dmm_packet(pbuf + devc->bufoffset); | |
257 | decode_packet(sdi, pbuf + devc->bufoffset); | |
258 | devc->bufoffset += dmm->packet_size; | |
259 | } else { | |
260 | devc->bufoffset++; | |
261 | } | |
262 | } | |
263 | ||
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; | |
268 | ||
269 | return SR_OK; | |
270 | } | |
271 | ||
272 | SR_PRIV int uni_t_dmm_receive_data(int fd, int revents, void *cb_data) | |
273 | { | |
274 | int ret; | |
275 | struct sr_dev_inst *sdi; | |
276 | struct dev_context *devc; | |
277 | int64_t time_ms; | |
278 | ||
279 | (void)fd; | |
280 | (void)revents; | |
281 | ||
282 | sdi = cb_data; | |
283 | devc = sdi->priv; | |
284 | ||
285 | if ((ret = get_and_handle_data(sdi)) != SR_OK) | |
286 | return FALSE; | |
287 | ||
288 | /* Abort acquisition if we acquired enough samples. */ | |
289 | if (devc->limit_samples && devc->num_samples >= devc->limit_samples) { | |
290 | sr_info("Requested number of samples reached."); | |
291 | sdi->driver->dev_acquisition_stop(sdi); | |
292 | } | |
293 | ||
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); | |
299 | return TRUE; | |
300 | } | |
301 | } | |
302 | ||
303 | return TRUE; | |
304 | } |