2 * This file is part of the libsigrok project.
4 * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
5 * Copyright (C) 2010-2012 Uwe Hermann <uwe@hermann-uwe.de>
6 * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
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.
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.
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/>.
25 #include <libserialport.h>
26 #include "libsigrok.h"
27 #include "libsigrok-internal.h"
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)
39 * Open the specified serial port.
41 * @param serial Previously initialized serial port structure.
42 * @param flags Flags to use when opening the serial port. Possible flags
43 * include SERIAL_RDWR, SERIAL_RDONLY, SERIAL_NONBLOCK.
45 * If the serial structure contains a serialcomm string, it will be
46 * passed to serial_set_paramstr() after the port is opened.
48 * @return SR_OK on success, SR_ERR on failure.
50 SR_PRIV int serial_open(struct sr_serial_dev_inst *serial, int flags)
57 sr_dbg("Invalid serial port.");
61 sr_spew("Opening serial port '%s' (flags %d).", serial->port, flags);
63 sp_get_port_by_name(serial->port, &serial->data);
65 if (flags & SERIAL_RDWR)
66 sp_flags = (SP_MODE_READ | SP_MODE_WRITE);
67 else if (flags & SERIAL_RDONLY)
68 sp_flags = SP_MODE_READ;
70 serial->nonblocking = (flags & SERIAL_NONBLOCK) ? 1 : 0;
72 ret = sp_open(serial->data, sp_flags);
76 sr_err("Attempt to open serial port with invalid parameters.");
79 error = sp_last_error_message();
80 sr_err("Error opening port: %s.", error);
81 sp_free_error_message(error);
86 sp_get_port_handle(serial->data, &serial->fd);
89 if (serial->serialcomm)
90 return serial_set_paramstr(serial, serial->serialcomm);
96 * Close the specified serial port.
98 * @param serial Previously initialized serial port structure.
100 * @return SR_OK on success, SR_ERR on failure.
102 SR_PRIV int serial_close(struct sr_serial_dev_inst *serial)
108 sr_dbg("Invalid serial port.");
113 sr_dbg("Cannot close unopened serial port %s.", serial->port);
117 sr_spew("Closing serial port %s.", serial->port);
119 ret = sp_close(serial->data);
123 sr_err("Attempt to close an invalid serial port.");
126 error = sp_last_error_message();
127 sr_err("Error closing port: %s.", error);
128 sp_free_error_message(error);
132 sp_free_port(serial->data);
141 * Flush serial port buffers.
143 * @param serial Previously initialized serial port structure.
145 * @return SR_OK on success, SR_ERR on failure.
147 SR_PRIV int serial_flush(struct sr_serial_dev_inst *serial)
153 sr_dbg("Invalid serial port.");
158 sr_dbg("Cannot flush unopened serial port %s.", serial->port);
162 sr_spew("Flushing serial port %s.", serial->port);
164 ret = sp_flush(serial->data, SP_BUF_BOTH);
168 sr_err("Attempt to flush an invalid serial port.");
171 error = sp_last_error_message();
172 sr_err("Error flushing port: %s.", error);
173 sp_free_error_message(error);
181 * Write a number of bytes to the specified serial port.
183 * @param serial Previously initialized serial port structure.
184 * @param buf Buffer containing the bytes to write.
185 * @param count Number of bytes to write.
187 * @return The number of bytes written, or a negative error code upon failure.
189 SR_PRIV int serial_write(struct sr_serial_dev_inst *serial,
190 const void *buf, size_t count)
196 sr_dbg("Invalid serial port.");
201 sr_dbg("Cannot use unopened serial port %s.", serial->port);
205 if (serial->nonblocking)
206 ret = sp_nonblocking_write(serial->data, buf, count);
208 ret = sp_blocking_write(serial->data, buf, count, 0);
212 sr_err("Attempted serial port write with invalid arguments.");
215 error = sp_last_error_message();
216 sr_err("Write error: %s.", error);
217 sp_free_error_message(error);
221 sr_spew("Wrote %d/%d bytes.", ret, count);
227 * Read a number of bytes from the specified serial port.
229 * @param serial Previously initialized serial port structure.
230 * @param buf Buffer where to store the bytes that are read.
231 * @param count The number of bytes to read.
233 * @return The number of bytes read, or a negative error code upon failure.
235 SR_PRIV int serial_read(struct sr_serial_dev_inst *serial, void *buf,
242 sr_dbg("Invalid serial port.");
247 sr_dbg("Cannot use unopened serial port %s.", serial->port);
251 if (serial->nonblocking)
252 ret = sp_nonblocking_read(serial->data, buf, count);
254 ret = sp_blocking_read(serial->data, buf, count, 0);
258 sr_err("Attempted serial port read with invalid arguments.");
261 error = sp_last_error_message();
262 sr_err("Read error: %s.", error);
263 sp_free_error_message(error);
268 sr_spew("Read %d/%d bytes.", ret, count);
274 * Set serial parameters for the specified serial port.
276 * @param serial Previously initialized serial port structure.
277 * @param baudrate The baudrate to set.
278 * @param bits The number of data bits to use.
279 * @param parity The parity setting to use (0 = none, 1 = even, 2 = odd).
280 * @param stopbits The number of stop bits to use (1 or 2).
281 * @param flowcontrol The flow control settings to use (0 = none, 1 = RTS/CTS,
284 * @return SR_OK upon success, SR_ERR upon failure.
286 SR_PRIV int serial_set_params(struct sr_serial_dev_inst *serial, int baudrate,
287 int bits, int parity, int stopbits,
288 int flowcontrol, int rts, int dtr)
292 struct sp_port_config *config;
295 sr_dbg("Invalid serial port.");
300 sr_dbg("Cannot configure unopened serial port %s.", serial->port);
304 sr_spew("Setting serial parameters on port %s.", serial->port);
306 sp_new_config(&config);
307 sp_set_config_baudrate(config, baudrate);
308 sp_set_config_bits(config, bits);
311 sp_set_config_parity(config, SP_PARITY_NONE);
314 sp_set_config_parity(config, SP_PARITY_EVEN);
317 sp_set_config_parity(config, SP_PARITY_ODD);
322 sp_set_config_stopbits(config, stopbits);
323 sp_set_config_rts(config, flowcontrol == 1 ? SP_RTS_FLOW_CONTROL : rts);
324 sp_set_config_cts(config, flowcontrol == 1 ? SP_CTS_FLOW_CONTROL : SP_CTS_IGNORE);
325 sp_set_config_dtr(config, dtr);
326 sp_set_config_dsr(config, SP_DSR_IGNORE);
327 sp_set_config_xon_xoff(config, flowcontrol == 2 ? SP_XONXOFF_INOUT : SP_XONXOFF_DISABLED);
329 ret = sp_set_config(serial->data, config);
330 sp_free_config(config);
334 sr_err("Invalid arguments for setting serial port parameters.");
337 error = sp_last_error_message();
338 sr_err("Error setting serial port parameters: %s.", error);
339 sp_free_error_message(error);
347 * Set serial parameters for the specified serial port.
349 * @param serial Previously initialized serial port structure.
350 * @param paramstr A serial communication parameters string, in the form
351 * of <speed>/<data bits><parity><stopbits><flow>, for example "9600/8n1" or
352 * "600/7o2" or "460800/8n1/flow=2" where flow is 0 for none, 1 for rts/cts and 2 for xon/xoff.
354 * @return SR_OK upon success, SR_ERR upon failure.
356 #define SERIAL_COMM_SPEC "^(\\d+)/([5678])([neo])([12])(.*)$"
357 SR_PRIV int serial_set_paramstr(struct sr_serial_dev_inst *serial,
358 const char *paramstr)
362 int speed, databits, parity, stopbits, flow, rts, dtr, i;
363 char *mstr, **opts, **kv;
365 speed = databits = parity = stopbits = flow = 0;
367 sr_spew("Parsing parameters from \"%s\".", paramstr);
368 reg = g_regex_new(SERIAL_COMM_SPEC, 0, 0, NULL);
369 if (g_regex_match(reg, paramstr, 0, &match)) {
370 if ((mstr = g_match_info_fetch(match, 1)))
371 speed = strtoul(mstr, NULL, 10);
373 if ((mstr = g_match_info_fetch(match, 2)))
374 databits = strtoul(mstr, NULL, 10);
376 if ((mstr = g_match_info_fetch(match, 3))) {
379 parity = SERIAL_PARITY_NONE;
382 parity = SERIAL_PARITY_EVEN;
385 parity = SERIAL_PARITY_ODD;
390 if ((mstr = g_match_info_fetch(match, 4)))
391 stopbits = strtoul(mstr, NULL, 10);
393 if ((mstr = g_match_info_fetch(match, 5)) && mstr[0] != '\0') {
394 if (mstr[0] != '/') {
395 sr_dbg("missing separator before extra options");
398 /* A set of "key=value" options separated by / */
399 opts = g_strsplit(mstr + 1, "/", 0);
400 for (i = 0; opts[i]; i++) {
401 kv = g_strsplit(opts[i], "=", 2);
402 if (!strncmp(kv[0], "rts", 3)) {
405 else if (kv[1][0] == '0')
408 sr_dbg("invalid value for rts: %c", kv[1][0]);
411 } else if (!strncmp(kv[0], "dtr", 3)) {
414 else if (kv[1][0] == '0')
417 sr_dbg("invalid value for dtr: %c", kv[1][0]);
420 } else if (!strncmp(kv[0], "flow", 4)) {
423 else if (kv[1][0] == '1')
425 else if (kv[1][0] == '2')
428 sr_dbg("invalid value for flow: %c", kv[1][0]);
439 g_match_info_unref(match);
443 return serial_set_params(serial, speed, databits, parity,
444 stopbits, flow, rts, dtr);
446 sr_dbg("Could not infer speed from parameter string.");
452 * Read a line from the specified serial port.
454 * @param serial Previously initialized serial port structure.
455 * @param buf Buffer where to store the bytes that are read.
456 * @param buflen Size of the buffer.
457 * @param timeout_ms How long to wait for a line to come in.
459 * Reading stops when CR of LR is found, which is stripped from the buffer.
461 * @return SR_OK on success, SR_ERR on failure.
463 SR_PRIV int serial_readline(struct sr_serial_dev_inst *serial, char **buf,
464 int *buflen, gint64 timeout_ms)
470 sr_dbg("Invalid serial port.");
475 sr_dbg("Cannot use unopened serial port %s.", serial->port);
480 start = g_get_monotonic_time();
485 len = maxlen - *buflen - 1;
488 len = serial_read(serial, *buf + *buflen, 1);
491 *(*buf + *buflen) = '\0';
492 if (*buflen > 0 && (*(*buf + *buflen - 1) == '\r'
493 || *(*buf + *buflen - 1) == '\n')) {
494 /* Strip CR/LF and terminate. */
495 *(*buf + --*buflen) = '\0';
499 if (g_get_monotonic_time() - start > timeout_ms)
506 sr_dbg("Received %d: '%s'.", *buflen, *buf);
512 * Try to find a valid packet in a serial data stream.
514 * @param serial Previously initialized serial port structure.
515 * @param buf Buffer containing the bytes to write.
516 * @param count Size of the buffer.
517 * @param packet_size Size, in bytes, of a valid packet.
518 * @param is_valid Callback that assesses whether the packet is valid or not.
519 * @param timeout_ms The timeout after which, if no packet is detected, to
521 * @param baudrate The baudrate of the serial port. This parameter is not
522 * critical, but it helps fine tune the serial port polling
525 * @return SR_OK if a valid packet is found within the given timeout,
526 * SR_ERR upon failure.
528 SR_PRIV int serial_stream_detect(struct sr_serial_dev_inst *serial,
529 uint8_t *buf, size_t *buflen,
530 size_t packet_size, packet_valid_t is_valid,
531 uint64_t timeout_ms, int baudrate)
533 uint64_t start, time, byte_delay_us;
534 size_t ibuf, i, maxlen;
539 sr_dbg("Detecting packets on %s (timeout = %" PRIu64
540 "ms, baudrate = %d).", serial->port, timeout_ms, baudrate);
542 if (maxlen < (packet_size / 2) ) {
543 sr_err("Buffer size must be at least twice the packet size.");
547 /* Assume 8n1 transmission. That is 10 bits for every byte. */
548 byte_delay_us = 10 * (1000000 / baudrate);
549 start = g_get_monotonic_time();
552 while (ibuf < maxlen) {
553 len = serial_read(serial, &buf[ibuf], 1);
556 } else if (len == 0) {
557 /* No logging, already done in serial_read(). */
559 /* Error reading byte, but continuing anyway. */
562 time = g_get_monotonic_time() - start;
565 if ((ibuf - i) >= packet_size) {
566 /* We have at least a packet's worth of data. */
567 if (is_valid(&buf[i])) {
568 sr_spew("Found valid %d-byte packet after "
569 "%" PRIu64 "ms.", (ibuf - i), time);
573 sr_spew("Got %d bytes, but not a valid "
574 "packet.", (ibuf - i));
576 /* Not a valid packet. Continue searching. */
579 if (time >= timeout_ms) {
581 sr_dbg("Detection timed out after %dms.", time);
585 g_usleep(byte_delay_us);
590 sr_err("Didn't find a valid packet (read %d bytes).", *buflen);
596 * Extract the serial device and options from the options linked list.
598 * @param options List of options passed from the command line.
599 * @param serial_device Pointer where to store the exctracted serial device.
600 * @param serial_options Pointer where to store the optional extracted serial
603 * @return SR_OK if a serial_device is found, SR_ERR if no device is found. The
604 * returned string should not be freed by the caller.
606 SR_PRIV int sr_serial_extract_options(GSList *options, const char **serial_device,
607 const char **serial_options)
610 struct sr_config *src;
612 *serial_device = NULL;
614 for (l = options; l; l = l->next) {
618 *serial_device = g_variant_get_string(src->data, NULL);
619 sr_dbg("Parsed serial device: %s", *serial_device);
622 case SR_CONF_SERIALCOMM:
623 *serial_options = g_variant_get_string(src->data, NULL);
624 sr_dbg("Parsed serial options: %s", *serial_options);
629 if (!*serial_device) {
630 sr_dbg("No serial device specified");
637 SR_PRIV int serial_source_add(struct sr_serial_dev_inst *serial, int events,
638 int timeout, sr_receive_data_callback_t cb, void *cb_data)
644 sp_get_port_handle(serial->data, &fd);
645 return sr_source_add(fd, events, timeout, cb, cb_data);
649 SR_PRIV int serial_source_remove(struct sr_serial_dev_inst *serial)
655 sp_get_port_handle(serial->data, &fd);
656 return sr_source_remove(fd);