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a1bb33af | 1 | /* |
50985c20 | 2 | * This file is part of the libsigrok project. |
a1bb33af | 3 | * |
c73d2ea4 | 4 | * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com> |
b19f4622 | 5 | * Copyright (C) 2010-2012 Uwe Hermann <uwe@hermann-uwe.de> |
766456be | 6 | * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com> |
a1bb33af UH |
7 | * |
8 | * This program is free software: you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation, either version 3 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
20 | */ | |
21 | ||
54b38f64 | 22 | #include <string.h> |
d02a535e | 23 | #include <stdlib.h> |
a1bb33af | 24 | #include <glib.h> |
0d4405ce | 25 | #include <libserialport.h> |
45c59c8b BV |
26 | #include "libsigrok.h" |
27 | #include "libsigrok-internal.h" | |
a1bb33af | 28 | |
29a27196 UH |
29 | /* Message logging helpers with subsystem-specific prefix string. */ |
30 | #define LOG_PREFIX "serial: " | |
31 | #define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args) | |
32 | #define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args) | |
33 | #define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args) | |
34 | #define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args) | |
35 | #define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args) | |
36 | #define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args) | |
b19f4622 | 37 | |
b19f4622 UH |
38 | /** |
39 | * Open the specified serial port. | |
40 | * | |
299bdb24 | 41 | * @param serial Previously initialized serial port structure. |
a54dd31e UH |
42 | * @param flags Flags to use when opening the serial port. Possible flags |
43 | * include SERIAL_RDWR, SERIAL_RDONLY, SERIAL_NONBLOCK. | |
b19f4622 | 44 | * |
299bdb24 BV |
45 | * If the serial structure contains a serialcomm string, it will be |
46 | * passed to serial_set_paramstr() after the port is opened. | |
47 | * | |
48 | * @return SR_OK on success, SR_ERR on failure. | |
b19f4622 | 49 | */ |
299bdb24 | 50 | SR_PRIV int serial_open(struct sr_serial_dev_inst *serial, int flags) |
d02a535e | 51 | { |
a9bce5a5 ML |
52 | int ret; |
53 | char *error; | |
b19f4622 | 54 | |
299bdb24 BV |
55 | if (!serial) { |
56 | sr_dbg("Invalid serial port."); | |
57 | return SR_ERR; | |
58 | } | |
59 | ||
60 | sr_spew("Opening serial port '%s' (flags %d).", serial->port, flags); | |
b19f4622 | 61 | |
c9bc57b6 ML |
62 | sp_get_port_by_name(serial->port, &serial->data); |
63 | ||
64 | ret = sp_open(serial->data, flags); | |
a9bce5a5 | 65 | |
a0dfaa6c UH |
66 | switch (ret) { |
67 | case SP_ERR_ARG: | |
68 | sr_err("Attempt to open serial port with invalid parameters."); | |
69 | return SR_ERR_ARG; | |
70 | case SP_ERR_FAIL: | |
71 | error = sp_last_error_message(); | |
72 | sr_err("Error opening port: %s.", error); | |
73 | sp_free_error_message(error); | |
74 | return SR_ERR; | |
a54dd31e UH |
75 | } |
76 | ||
a9bce5a5 | 77 | #ifndef _WIN32 |
c9bc57b6 | 78 | serial->fd = serial->data->fd; |
926b866c | 79 | #endif |
299bdb24 BV |
80 | |
81 | if (serial->serialcomm) | |
82 | return serial_set_paramstr(serial, serial->serialcomm); | |
83 | else | |
84 | return SR_OK; | |
d02a535e BV |
85 | } |
86 | ||
b19f4622 UH |
87 | /** |
88 | * Close the specified serial port. | |
89 | * | |
299bdb24 | 90 | * @param serial Previously initialized serial port structure. |
b19f4622 | 91 | * |
299bdb24 | 92 | * @return SR_OK on success, SR_ERR on failure. |
2119ab03 | 93 | */ |
299bdb24 | 94 | SR_PRIV int serial_close(struct sr_serial_dev_inst *serial) |
d02a535e | 95 | { |
299bdb24 | 96 | int ret; |
a9bce5a5 | 97 | char *error; |
299bdb24 BV |
98 | |
99 | if (!serial) { | |
100 | sr_dbg("Invalid serial port."); | |
101 | return SR_ERR; | |
102 | } | |
103 | ||
104 | if (serial->fd == -1) { | |
105 | sr_dbg("Cannot close unopened serial port %s (fd %d).", | |
106 | serial->port, serial->fd); | |
107 | return SR_ERR; | |
108 | } | |
109 | ||
110 | sr_spew("Closing serial port %s (fd %d).", serial->port, serial->fd); | |
b19f4622 | 111 | |
c9bc57b6 | 112 | ret = sp_close(serial->data); |
066d42b1 | 113 | sp_free_port(serial->data); |
a9bce5a5 | 114 | |
a0dfaa6c UH |
115 | switch (ret) { |
116 | case SP_ERR_ARG: | |
117 | sr_err("Attempt to close an invalid serial port."); | |
118 | return SR_ERR_ARG; | |
119 | case SP_ERR_FAIL: | |
120 | error = sp_last_error_message(); | |
121 | sr_err("Error closing port: %s.", error); | |
122 | sp_free_error_message(error); | |
123 | return SR_ERR; | |
b19f4622 | 124 | } |
299bdb24 BV |
125 | |
126 | serial->fd = -1; | |
b19f4622 | 127 | |
6a76efeb | 128 | return SR_OK; |
d02a535e BV |
129 | } |
130 | ||
b19f4622 | 131 | /** |
299bdb24 | 132 | * Flush serial port buffers. |
b19f4622 | 133 | * |
299bdb24 | 134 | * @param serial Previously initialized serial port structure. |
b19f4622 | 135 | * |
299bdb24 | 136 | * @return SR_OK on success, SR_ERR on failure. |
1fdb75e1 | 137 | */ |
299bdb24 | 138 | SR_PRIV int serial_flush(struct sr_serial_dev_inst *serial) |
06d64eb8 | 139 | { |
299bdb24 | 140 | int ret; |
a9bce5a5 | 141 | char *error; |
299bdb24 BV |
142 | |
143 | if (!serial) { | |
144 | sr_dbg("Invalid serial port."); | |
145 | return SR_ERR; | |
146 | } | |
147 | ||
148 | if (serial->fd == -1) { | |
149 | sr_dbg("Cannot flush unopened serial port %s (fd %d).", | |
150 | serial->port, serial->fd); | |
151 | return SR_ERR; | |
152 | } | |
153 | ||
154 | sr_spew("Flushing serial port %s (fd %d).", serial->port, serial->fd); | |
b19f4622 | 155 | |
c9bc57b6 | 156 | ret = sp_flush(serial->data); |
a9bce5a5 | 157 | |
a0dfaa6c UH |
158 | switch (ret) { |
159 | case SP_ERR_ARG: | |
160 | sr_err("Attempt to flush an invalid serial port."); | |
161 | return SR_ERR_ARG; | |
162 | case SP_ERR_FAIL: | |
163 | error = sp_last_error_message(); | |
164 | sr_err("Error flushing port: %s.", error); | |
165 | sp_free_error_message(error); | |
166 | return SR_ERR; | |
299bdb24 | 167 | } |
b19f4622 | 168 | |
6a76efeb | 169 | return SR_OK; |
06d64eb8 BV |
170 | } |
171 | ||
b19f4622 | 172 | /** |
2119ab03 | 173 | * Write a number of bytes to the specified serial port. |
b19f4622 | 174 | * |
299bdb24 | 175 | * @param serial Previously initialized serial port structure. |
b19f4622 UH |
176 | * @param buf Buffer containing the bytes to write. |
177 | * @param count Number of bytes to write. | |
178 | * | |
6a76efeb | 179 | * @return The number of bytes written, or a negative error code upon failure. |
2119ab03 | 180 | */ |
299bdb24 BV |
181 | SR_PRIV int serial_write(struct sr_serial_dev_inst *serial, |
182 | const void *buf, size_t count) | |
2119ab03 | 183 | { |
299bdb24 | 184 | ssize_t ret; |
a9bce5a5 | 185 | char *error; |
299bdb24 BV |
186 | |
187 | if (!serial) { | |
188 | sr_dbg("Invalid serial port."); | |
6a76efeb | 189 | return SR_ERR; |
299bdb24 BV |
190 | } |
191 | ||
192 | if (serial->fd == -1) { | |
193 | sr_dbg("Cannot use unopened serial port %s (fd %d).", | |
194 | serial->port, serial->fd); | |
6a76efeb | 195 | return SR_ERR; |
299bdb24 BV |
196 | } |
197 | ||
c9bc57b6 | 198 | ret = sp_write(serial->data, buf, count); |
a9bce5a5 | 199 | |
a0dfaa6c UH |
200 | switch (ret) { |
201 | case SP_ERR_ARG: | |
202 | sr_err("Attempted serial port write with invalid arguments."); | |
203 | return SR_ERR_ARG; | |
204 | case SP_ERR_FAIL: | |
205 | error = sp_last_error_message(); | |
206 | sr_err("Write error: %s.", error); | |
207 | sp_free_error_message(error); | |
208 | return SR_ERR; | |
a9bce5a5 ML |
209 | } |
210 | ||
211 | sr_spew("Wrote %d/%d bytes (fd %d).", ret, count, serial->fd); | |
b19f4622 UH |
212 | |
213 | return ret; | |
2119ab03 UH |
214 | } |
215 | ||
b19f4622 | 216 | /** |
2119ab03 | 217 | * Read a number of bytes from the specified serial port. |
b19f4622 | 218 | * |
299bdb24 | 219 | * @param serial Previously initialized serial port structure. |
b19f4622 UH |
220 | * @param buf Buffer where to store the bytes that are read. |
221 | * @param count The number of bytes to read. | |
222 | * | |
6a76efeb | 223 | * @return The number of bytes read, or a negative error code upon failure. |
2119ab03 | 224 | */ |
299bdb24 BV |
225 | SR_PRIV int serial_read(struct sr_serial_dev_inst *serial, void *buf, |
226 | size_t count) | |
2119ab03 | 227 | { |
299bdb24 | 228 | ssize_t ret; |
a9bce5a5 | 229 | char *error; |
299bdb24 BV |
230 | |
231 | if (!serial) { | |
232 | sr_dbg("Invalid serial port."); | |
6a76efeb | 233 | return SR_ERR; |
299bdb24 BV |
234 | } |
235 | ||
236 | if (serial->fd == -1) { | |
237 | sr_dbg("Cannot use unopened serial port %s (fd %d).", | |
238 | serial->port, serial->fd); | |
6a76efeb | 239 | return SR_ERR; |
299bdb24 BV |
240 | } |
241 | ||
c9bc57b6 | 242 | ret = sp_read(serial->data, buf, count); |
2119ab03 | 243 | |
a0dfaa6c UH |
244 | switch (ret) { |
245 | case SP_ERR_ARG: | |
246 | sr_err("Attempted serial port read with invalid arguments."); | |
247 | return SR_ERR_ARG; | |
449cc16b UH |
248 | // Temporarily disabled, will come back later. |
249 | // case SP_ERR_FAIL: | |
250 | // error = sp_last_error_message(); | |
251 | // sr_err("Read error: %s.", error); | |
252 | // sp_free_error_message(error); | |
253 | // return SR_ERR; | |
a9bce5a5 ML |
254 | } |
255 | ||
256 | sr_spew("Read %d/%d bytes (fd %d).", ret, count, serial->fd); | |
b19f4622 UH |
257 | |
258 | return ret; | |
2119ab03 UH |
259 | } |
260 | ||
b19f4622 UH |
261 | /** |
262 | * Set serial parameters for the specified serial port. | |
263 | * | |
299bdb24 | 264 | * @param serial Previously initialized serial port structure. |
b19f4622 UH |
265 | * @param baudrate The baudrate to set. |
266 | * @param bits The number of data bits to use. | |
267 | * @param parity The parity setting to use (0 = none, 1 = even, 2 = odd). | |
268 | * @param stopbits The number of stop bits to use (1 or 2). | |
269 | * @param flowcontrol The flow control settings to use (0 = none, 1 = RTS/CTS, | |
270 | * 2 = XON/XOFF). | |
2119ab03 | 271 | * |
b19f4622 | 272 | * @return SR_OK upon success, SR_ERR upon failure. |
1ff7712c | 273 | */ |
299bdb24 | 274 | SR_PRIV int serial_set_params(struct sr_serial_dev_inst *serial, int baudrate, |
39e5d798 UH |
275 | int bits, int parity, int stopbits, |
276 | int flowcontrol, int rts, int dtr) | |
d02a535e | 277 | { |
a9bce5a5 ML |
278 | int ret; |
279 | char *error; | |
e385e2ed | 280 | struct sp_port_config config; |
a9bce5a5 | 281 | |
299bdb24 BV |
282 | if (!serial) { |
283 | sr_dbg("Invalid serial port."); | |
284 | return SR_ERR; | |
285 | } | |
286 | ||
287 | if (serial->fd == -1) { | |
288 | sr_dbg("Cannot configure unopened serial port %s (fd %d).", | |
39e5d798 | 289 | serial->port, serial->fd); |
299bdb24 BV |
290 | return SR_ERR; |
291 | } | |
292 | ||
293 | sr_spew("Setting serial parameters on port %s (fd %d).", serial->port, | |
39e5d798 | 294 | serial->fd); |
b19f4622 | 295 | |
e385e2ed ML |
296 | config.baudrate = baudrate; |
297 | config.bits = bits; | |
298 | config.parity = parity; | |
299 | config.stopbits = stopbits; | |
300 | config.flowcontrol = flowcontrol; | |
301 | config.rts = rts; | |
302 | config.dtr = dtr; | |
303 | ||
304 | ret = sp_set_config(serial->data, &config); | |
a9bce5a5 | 305 | |
a0dfaa6c UH |
306 | switch (ret) { |
307 | case SP_ERR_ARG: | |
308 | sr_err("Invalid arguments for setting serial port parameters."); | |
309 | return SR_ERR_ARG; | |
310 | case SP_ERR_FAIL: | |
311 | error = sp_last_error_message(); | |
312 | sr_err("Error setting serial port parameters: %s.", error); | |
313 | sp_free_error_message(error); | |
314 | return SR_ERR; | |
700dcd5c UH |
315 | } |
316 | ||
e46b8fb1 | 317 | return SR_OK; |
d02a535e | 318 | } |
792fc686 | 319 | |
299bdb24 BV |
320 | /** |
321 | * Set serial parameters for the specified serial port. | |
322 | * | |
323 | * @param serial Previously initialized serial port structure. | |
324 | * @param paramstr A serial communication parameters string, in the form | |
26ddb5ba | 325 | * of <speed>/<data bits><parity><stopbits><flow>, for example "9600/8n1" or |
326 | * "600/7o2" or "460800/8n1/flow=2" where flow is 0 for none, 1 for rts/cts and 2 for xon/xoff. | |
299bdb24 BV |
327 | * |
328 | * @return SR_OK upon success, SR_ERR upon failure. | |
329 | */ | |
71caaad4 | 330 | #define SERIAL_COMM_SPEC "^(\\d+)/([78])([neo])([12])(.*)$" |
299bdb24 BV |
331 | SR_PRIV int serial_set_paramstr(struct sr_serial_dev_inst *serial, |
332 | const char *paramstr) | |
792fc686 BV |
333 | { |
334 | GRegex *reg; | |
335 | GMatchInfo *match; | |
26ddb5ba | 336 | int speed, databits, parity, stopbits, flow, rts, dtr, i; |
71caaad4 | 337 | char *mstr, **opts, **kv; |
792fc686 | 338 | |
26ddb5ba | 339 | speed = databits = parity = stopbits = flow = 0; |
71caaad4 | 340 | rts = dtr = -1; |
ea088bb6 | 341 | sr_spew("Parsing parameters from \"%s\".", paramstr); |
792fc686 BV |
342 | reg = g_regex_new(SERIAL_COMM_SPEC, 0, 0, NULL); |
343 | if (g_regex_match(reg, paramstr, 0, &match)) { | |
344 | if ((mstr = g_match_info_fetch(match, 1))) | |
345 | speed = strtoul(mstr, NULL, 10); | |
346 | g_free(mstr); | |
347 | if ((mstr = g_match_info_fetch(match, 2))) | |
348 | databits = strtoul(mstr, NULL, 10); | |
349 | g_free(mstr); | |
350 | if ((mstr = g_match_info_fetch(match, 3))) { | |
351 | switch (mstr[0]) { | |
352 | case 'n': | |
353 | parity = SERIAL_PARITY_NONE; | |
354 | break; | |
355 | case 'e': | |
356 | parity = SERIAL_PARITY_EVEN; | |
357 | break; | |
358 | case 'o': | |
359 | parity = SERIAL_PARITY_ODD; | |
360 | break; | |
361 | } | |
362 | } | |
363 | g_free(mstr); | |
364 | if ((mstr = g_match_info_fetch(match, 4))) | |
365 | stopbits = strtoul(mstr, NULL, 10); | |
366 | g_free(mstr); | |
71caaad4 BV |
367 | if ((mstr = g_match_info_fetch(match, 5)) && mstr[0] != '\0') { |
368 | if (mstr[0] != '/') { | |
369 | sr_dbg("missing separator before extra options"); | |
370 | speed = 0; | |
371 | } else { | |
372 | /* A set of "key=value" options separated by / */ | |
373 | opts = g_strsplit(mstr + 1, "/", 0); | |
374 | for (i = 0; opts[i]; i++) { | |
375 | kv = g_strsplit(opts[i], "=", 2); | |
376 | if (!strncmp(kv[0], "rts", 3)) { | |
377 | if (kv[1][0] == '1') | |
378 | rts = 1; | |
379 | else if (kv[1][0] == '0') | |
380 | rts = 0; | |
381 | else { | |
382 | sr_dbg("invalid value for rts: %c", kv[1][0]); | |
383 | speed = 0; | |
384 | } | |
385 | } else if (!strncmp(kv[0], "dtr", 3)) { | |
386 | if (kv[1][0] == '1') | |
387 | dtr = 1; | |
388 | else if (kv[1][0] == '0') | |
389 | dtr = 0; | |
390 | else { | |
391 | sr_dbg("invalid value for dtr: %c", kv[1][0]); | |
392 | speed = 0; | |
393 | } | |
26ddb5ba | 394 | } else if (!strncmp(kv[0], "flow", 4)) { |
395 | if (kv[1][0] == '0') | |
396 | flow = 0; | |
397 | else if (kv[1][0] == '1') | |
398 | flow = 1; | |
399 | else if (kv[1][0] == '2') | |
400 | flow = 2; | |
401 | else { | |
402 | sr_dbg("invalid value for flow: %c", kv[1][0]); | |
403 | speed = 0; | |
404 | } | |
71caaad4 BV |
405 | } |
406 | g_strfreev(kv); | |
407 | } | |
408 | g_strfreev(opts); | |
409 | } | |
410 | } | |
411 | g_free(mstr); | |
792fc686 BV |
412 | } |
413 | g_match_info_unref(match); | |
414 | g_regex_unref(reg); | |
415 | ||
ea088bb6 AG |
416 | if (speed) { |
417 | return serial_set_params(serial, speed, databits, parity, | |
26ddb5ba | 418 | stopbits, flow, rts, dtr); |
ea088bb6 AG |
419 | } else { |
420 | sr_dbg("Could not infer speed from parameter string."); | |
792fc686 | 421 | return SR_ERR_ARG; |
ea088bb6 | 422 | } |
792fc686 BV |
423 | } |
424 | ||
299bdb24 BV |
425 | /** |
426 | * Read a line from the specified serial port. | |
427 | * | |
428 | * @param serial Previously initialized serial port structure. | |
429 | * @param buf Buffer where to store the bytes that are read. | |
430 | * @param buflen Size of the buffer. | |
431 | * @param timeout_ms How long to wait for a line to come in. | |
432 | * | |
433 | * Reading stops when CR of LR is found, which is stripped from the buffer. | |
434 | * | |
435 | * @return SR_OK on success, SR_ERR on failure. | |
436 | */ | |
437 | SR_PRIV int serial_readline(struct sr_serial_dev_inst *serial, char **buf, | |
438 | int *buflen, gint64 timeout_ms) | |
6f22a8ef | 439 | { |
b87f8504 | 440 | gint64 start; |
6f22a8ef UH |
441 | int maxlen, len; |
442 | ||
299bdb24 BV |
443 | if (!serial || serial->fd == -1) { |
444 | sr_dbg("Invalid serial port."); | |
445 | return SR_ERR; | |
446 | } | |
447 | ||
448 | if (serial->fd == -1) { | |
449 | sr_dbg("Cannot use unopened serial port %s (fd %d).", | |
450 | serial->port, serial->fd); | |
451 | return -1; | |
452 | } | |
453 | ||
6f22a8ef UH |
454 | timeout_ms *= 1000; |
455 | start = g_get_monotonic_time(); | |
456 | ||
457 | maxlen = *buflen; | |
458 | *buflen = len = 0; | |
459 | while(1) { | |
460 | len = maxlen - *buflen - 1; | |
461 | if (len < 1) | |
462 | break; | |
299bdb24 | 463 | len = serial_read(serial, *buf + *buflen, 1); |
6f22a8ef UH |
464 | if (len > 0) { |
465 | *buflen += len; | |
466 | *(*buf + *buflen) = '\0'; | |
318dd53c BV |
467 | if (*buflen > 0 && (*(*buf + *buflen - 1) == '\r' |
468 | || *(*buf + *buflen - 1) == '\n')) { | |
469 | /* Strip CR/LF and terminate. */ | |
6f22a8ef UH |
470 | *(*buf + --*buflen) = '\0'; |
471 | break; | |
472 | } | |
473 | } | |
474 | if (g_get_monotonic_time() - start > timeout_ms) | |
475 | /* Timeout */ | |
476 | break; | |
5715e84f DT |
477 | if (len < 1) |
478 | g_usleep(2000); | |
6f22a8ef | 479 | } |
318dd53c BV |
480 | if (*buflen) |
481 | sr_dbg("Received %d: '%s'.", *buflen, *buf); | |
6f22a8ef UH |
482 | |
483 | return SR_OK; | |
484 | } | |
766456be UH |
485 | |
486 | /** | |
487 | * Try to find a valid packet in a serial data stream. | |
488 | * | |
489 | * @param serial Previously initialized serial port structure. | |
490 | * @param buf Buffer containing the bytes to write. | |
491 | * @param count Size of the buffer. | |
492 | * @param packet_size Size, in bytes, of a valid packet. | |
493 | * @param is_valid Callback that assesses whether the packet is valid or not. | |
494 | * @param timeout_ms The timeout after which, if no packet is detected, to | |
495 | * abort scanning. | |
496 | * @param baudrate The baudrate of the serial port. This parameter is not | |
497 | * critical, but it helps fine tune the serial port polling | |
498 | * delay. | |
499 | * | |
500 | * @return SR_OK if a valid packet is found within the given timeout, | |
501 | * SR_ERR upon failure. | |
502 | */ | |
503 | SR_PRIV int serial_stream_detect(struct sr_serial_dev_inst *serial, | |
504 | uint8_t *buf, size_t *buflen, | |
505 | size_t packet_size, packet_valid_t is_valid, | |
506 | uint64_t timeout_ms, int baudrate) | |
507 | { | |
508 | uint64_t start, time, byte_delay_us; | |
509 | size_t ibuf, i, maxlen; | |
510 | int len; | |
511 | ||
512 | maxlen = *buflen; | |
513 | ||
514 | sr_dbg("Detecting packets on FD %d (timeout = %" PRIu64 | |
515 | "ms, baudrate = %d).", serial->fd, timeout_ms, baudrate); | |
516 | ||
517 | if (maxlen < (packet_size / 2) ) { | |
518 | sr_err("Buffer size must be at least twice the packet size."); | |
519 | return SR_ERR; | |
520 | } | |
521 | ||
766456be UH |
522 | /* Assume 8n1 transmission. That is 10 bits for every byte. */ |
523 | byte_delay_us = 10 * (1000000 / baudrate); | |
524 | start = g_get_monotonic_time(); | |
525 | ||
526 | i = ibuf = len = 0; | |
527 | while (ibuf < maxlen) { | |
528 | len = serial_read(serial, &buf[ibuf], 1); | |
529 | if (len > 0) { | |
530 | ibuf += len; | |
531 | } else if (len == 0) { | |
006dbe55 | 532 | /* No logging, already done in serial_read(). */ |
766456be UH |
533 | } else { |
534 | /* Error reading byte, but continuing anyway. */ | |
535 | } | |
551c3d8c AG |
536 | |
537 | time = g_get_monotonic_time() - start; | |
538 | time /= 1000; | |
539 | ||
766456be UH |
540 | if ((ibuf - i) >= packet_size) { |
541 | /* We have at least a packet's worth of data. */ | |
542 | if (is_valid(&buf[i])) { | |
766456be UH |
543 | sr_spew("Found valid %d-byte packet after " |
544 | "%" PRIu64 "ms.", (ibuf - i), time); | |
545 | *buflen = ibuf; | |
546 | return SR_OK; | |
547 | } else { | |
548 | sr_spew("Got %d bytes, but not a valid " | |
549 | "packet.", (ibuf - i)); | |
550 | } | |
551 | /* Not a valid packet. Continue searching. */ | |
552 | i++; | |
553 | } | |
551c3d8c | 554 | if (time >= timeout_ms) { |
766456be | 555 | /* Timeout */ |
551c3d8c | 556 | sr_dbg("Detection timed out after %dms.", time); |
766456be UH |
557 | break; |
558 | } | |
5715e84f DT |
559 | if (len < 1) |
560 | g_usleep(byte_delay_us); | |
766456be UH |
561 | } |
562 | ||
563 | *buflen = ibuf; | |
564 | ||
565 | sr_err("Didn't find a valid packet (read %d bytes).", *buflen); | |
566 | ||
567 | return SR_ERR; | |
568 | } |