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>
7 * Copyright (C) 2014 Uffe Jakobsen <uffe@uffe.org>
9 * This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation, either version 3 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program. If not, see <http://www.gnu.org/licenses/>.
27 #include <glib/gstdio.h>
28 #ifdef HAVE_LIBSERIALPORT
29 #include <libserialport.h>
31 #include <libsigrok/libsigrok.h>
32 #include "libsigrok-internal.h"
34 #include <windows.h> /* for HANDLE */
38 #define LOG_PREFIX "serial"
44 * Serial port handling.
48 * @defgroup grp_serial Serial port handling
50 * Serial port handling functions.
55 #ifdef HAVE_SERIAL_COMM
57 /* See if a (assumed opened) serial port is of any supported type. */
58 static int dev_is_supported(struct sr_serial_dev_inst *serial)
62 if (!serial->lib_funcs)
69 * Open the specified serial port.
71 * @param serial Previously initialized serial port structure.
72 * @param[in] flags Flags to use when opening the serial port. Possible flags
73 * include SERIAL_RDWR, SERIAL_RDONLY.
75 * If the serial structure contains a serialcomm string, it will be
76 * passed to serial_set_paramstr() after the port is opened.
78 * @retval SR_OK Success.
79 * @retval SR_ERR Failure.
83 SR_PRIV int serial_open(struct sr_serial_dev_inst *serial, int flags)
88 sr_dbg("Invalid serial port.");
92 sr_spew("Opening serial port '%s' (flags %d).", serial->port, flags);
95 * Determine which serial transport library to use. Derive the
96 * variant from the serial port's name. Default to libserialport
97 * for backwards compatibility.
99 if (ser_name_is_hid(serial))
100 serial->lib_funcs = ser_lib_funcs_hid;
102 serial->lib_funcs = ser_lib_funcs_libsp;
103 if (!serial->lib_funcs)
107 * Note that use of the 'rcv_buffer' is optional, and the buffer's
108 * size heavily depends on the specific transport. That's why the
109 * buffer's content gets accessed and the buffer is released here in
110 * common code, but the buffer gets allocated in libraries' open()
115 * Run the transport's open routine. Setup the bitrate and the
118 if (!serial->lib_funcs->open)
120 ret = serial->lib_funcs->open(serial, flags);
124 if (serial->serialcomm)
125 return serial_set_paramstr(serial, serial->serialcomm);
131 * Close the specified serial port.
133 * @param serial Previously initialized serial port structure.
135 * @retval SR_OK Success.
136 * @retval SR_ERR Failure.
140 SR_PRIV int serial_close(struct sr_serial_dev_inst *serial)
145 sr_dbg("Invalid serial port.");
149 sr_spew("Closing serial port %s.", serial->port);
151 if (!serial->lib_funcs || !serial->lib_funcs->close)
154 rc = serial->lib_funcs->close(serial);
155 if (rc == SR_OK && serial->rcv_buffer) {
156 g_string_free(serial->rcv_buffer, TRUE);
157 serial->rcv_buffer = NULL;
164 * Flush serial port buffers. Empty buffers, discard pending RX and TX data.
166 * @param serial Previously initialized serial port structure.
168 * @retval SR_OK Success.
169 * @retval SR_ERR Failure.
173 SR_PRIV int serial_flush(struct sr_serial_dev_inst *serial)
176 sr_dbg("Invalid serial port.");
180 sr_spew("Flushing serial port %s.", serial->port);
182 sr_ser_discard_queued_data(serial);
184 if (!serial->lib_funcs || !serial->lib_funcs->flush)
187 return serial->lib_funcs->flush(serial);
191 * Drain serial port buffers. Wait for pending TX data to be sent.
193 * @param serial Previously initialized serial port structure.
195 * @retval SR_OK Success.
196 * @retval SR_ERR Failure.
200 SR_PRIV int serial_drain(struct sr_serial_dev_inst *serial)
203 sr_dbg("Invalid serial port.");
207 sr_spew("Draining serial port %s.", serial->port);
209 if (!serial->lib_funcs || !serial->lib_funcs->drain)
212 return serial->lib_funcs->drain(serial);
216 * Provide an internal RX data buffer for the serial port. This is not
217 * supposed to be used directly by applications. Instead optional and
218 * alternative transports for serial communication can use this buffer
219 * if their progress is driven from background activity, and is not
220 * (directly) driven by external API calls.
222 * BEWARE! This implementation assumes that data which gets communicated
223 * via UART can get stored in a GString (which is a char array). Since
224 * the API hides this detail, we can address this issue later when needed.
225 * Callers use the API which communicates bytes.
229 * Discard previously queued RX data. Internal to the serial subsystem,
230 * coordination between common and transport specific support code.
232 * @param[in] serial Previously opened serial port instance.
236 SR_PRIV void sr_ser_discard_queued_data(struct sr_serial_dev_inst *serial)
240 if (!serial->rcv_buffer)
243 g_string_truncate(serial->rcv_buffer, 0);
247 * Get amount of queued RX data. Internal to the serial subsystem,
248 * coordination between common and transport specific support code.
250 * @param[in] serial Previously opened serial port instance.
254 SR_PRIV size_t sr_ser_has_queued_data(struct sr_serial_dev_inst *serial)
258 if (!serial->rcv_buffer)
261 return serial->rcv_buffer->len;
265 * Queue received data. Internal to the serial subsystem, coordination
266 * between common and transport specific support code.
268 * @param[in] serial Previously opened serial port instance.
269 * @param[in] data Pointer to data bytes to queue.
270 * @param[in] len Number of data bytes to queue.
274 SR_PRIV void sr_ser_queue_rx_data(struct sr_serial_dev_inst *serial,
275 const uint8_t *data, size_t len)
282 if (serial->rcv_buffer)
283 g_string_append_len(serial->rcv_buffer, (const gchar *)data, len);
287 * Retrieve previously queued RX data. Internal to the serial subsystem,
288 * coordination between common and transport specific support code.
290 * @param[in] serial Previously opened serial port instance.
291 * @param[out] data Pointer to store retrieved data bytes into.
292 * @param[in] len Number of data bytes to retrieve.
296 SR_PRIV size_t sr_ser_unqueue_rx_data(struct sr_serial_dev_inst *serial,
297 uint8_t *data, size_t len)
307 qlen = sr_ser_has_queued_data(serial);
311 buf = serial->rcv_buffer;
315 memcpy(data, buf->str, len);
316 g_string_erase(buf, 0, len);
323 * Check for available receive data.
325 * @param[in] serial Previously opened serial port instance.
327 * @returns The number of (known) available RX data bytes.
329 * Returns 0 if no receive data is available, or if the amount of
330 * available receive data cannot get determined.
332 SR_PRIV size_t serial_has_receive_data(struct sr_serial_dev_inst *serial)
334 size_t lib_count, buf_count;
340 if (serial->lib_funcs && serial->lib_funcs->get_rx_avail)
341 lib_count = serial->lib_funcs->get_rx_avail(serial);
343 buf_count = sr_ser_has_queued_data(serial);
345 return lib_count + buf_count;
348 static int _serial_write(struct sr_serial_dev_inst *serial,
349 const void *buf, size_t count,
350 int nonblocking, unsigned int timeout_ms)
355 sr_dbg("Invalid serial port.");
359 if (!serial->lib_funcs || !serial->lib_funcs->write)
361 ret = serial->lib_funcs->write(serial, buf, count,
362 nonblocking, timeout_ms);
363 sr_spew("Wrote %zd/%zu bytes.", ret, count);
369 * Write a number of bytes to the specified serial port, blocking until finished.
371 * @param serial Previously initialized serial port structure.
372 * @param[in] buf Buffer containing the bytes to write.
373 * @param[in] count Number of bytes to write.
374 * @param[in] timeout_ms Timeout in ms, or 0 for no timeout.
376 * @retval SR_ERR_ARG Invalid argument.
377 * @retval SR_ERR Other error.
378 * @retval other The number of bytes written. If this is less than the number
379 * specified in the call, the timeout was reached.
383 SR_PRIV int serial_write_blocking(struct sr_serial_dev_inst *serial,
384 const void *buf, size_t count, unsigned int timeout_ms)
386 return _serial_write(serial, buf, count, 0, timeout_ms);
390 * Write a number of bytes to the specified serial port, return immediately.
392 * @param serial Previously initialized serial port structure.
393 * @param[in] buf Buffer containing the bytes to write.
394 * @param[in] count Number of bytes to write.
396 * @retval SR_ERR_ARG Invalid argument.
397 * @retval SR_ERR Other error.
398 * @retval other The number of bytes written.
402 SR_PRIV int serial_write_nonblocking(struct sr_serial_dev_inst *serial,
403 const void *buf, size_t count)
405 return _serial_write(serial, buf, count, 1, 0);
408 static int _serial_read(struct sr_serial_dev_inst *serial,
409 void *buf, size_t count, int nonblocking, unsigned int timeout_ms)
414 sr_dbg("Invalid serial port.");
418 if (!serial->lib_funcs || !serial->lib_funcs->read)
420 ret = serial->lib_funcs->read(serial, buf, count,
421 nonblocking, timeout_ms);
423 sr_spew("Read %zd/%zu bytes.", ret, count);
429 * Read a number of bytes from the specified serial port, block until finished.
431 * @param serial Previously initialized serial port structure.
432 * @param buf Buffer where to store the bytes that are read.
433 * @param[in] count The number of bytes to read.
434 * @param[in] timeout_ms Timeout in ms, or 0 for no timeout.
436 * @retval SR_ERR_ARG Invalid argument.
437 * @retval SR_ERR Other error.
438 * @retval other The number of bytes read. If this is less than the number
439 * requested, the timeout was reached.
443 SR_PRIV int serial_read_blocking(struct sr_serial_dev_inst *serial,
444 void *buf, size_t count, unsigned int timeout_ms)
446 return _serial_read(serial, buf, count, 0, timeout_ms);
450 * Try to read up to @a count bytes from the specified serial port, return
451 * immediately with what's available.
453 * @param serial Previously initialized serial port structure.
454 * @param buf Buffer where to store the bytes that are read.
455 * @param[in] count The number of bytes to read.
457 * @retval SR_ERR_ARG Invalid argument.
458 * @retval SR_ERR Other error.
459 * @retval other The number of bytes read.
463 SR_PRIV int serial_read_nonblocking(struct sr_serial_dev_inst *serial,
464 void *buf, size_t count)
466 return _serial_read(serial, buf, count, 1, 0);
470 * Set serial parameters for the specified serial port.
472 * @param serial Previously initialized serial port structure.
473 * @param[in] baudrate The baudrate to set.
474 * @param[in] bits The number of data bits to use (5, 6, 7 or 8).
475 * @param[in] parity The parity setting to use (0 = none, 1 = even, 2 = odd).
476 * @param[in] stopbits The number of stop bits to use (1 or 2).
477 * @param[in] flowcontrol The flow control settings to use (0 = none,
478 * 1 = RTS/CTS, 2 = XON/XOFF).
479 * @param[in] rts Status of RTS line (0 or 1; required by some interfaces).
480 * @param[in] dtr Status of DTR line (0 or 1; required by some interfaces).
482 * @retval SR_OK Success.
483 * @retval SR_ERR Failure.
487 SR_PRIV int serial_set_params(struct sr_serial_dev_inst *serial,
488 int baudrate, int bits, int parity, int stopbits,
489 int flowcontrol, int rts, int dtr)
494 sr_dbg("Invalid serial port.");
498 sr_spew("Setting serial parameters on port %s.", serial->port);
500 if (!serial->lib_funcs || !serial->lib_funcs->set_params)
502 ret = serial->lib_funcs->set_params(serial,
503 baudrate, bits, parity, stopbits,
504 flowcontrol, rts, dtr);
506 serial->comm_params.bit_rate = baudrate;
507 serial->comm_params.data_bits = bits;
508 serial->comm_params.parity_bits = parity ? 1 : 0;
509 serial->comm_params.stop_bits = stopbits;
510 sr_dbg("DBG: %s() rate %d, %d%s%d", __func__,
512 (parity == 0) ? "n" : "x",
520 * Set serial parameters for the specified serial port from parameter string.
522 * @param serial Previously initialized serial port structure.
523 * @param[in] paramstr A serial communication parameters string of the form
524 * "<baudrate>/<bits><parity><stopbits>{/<option>}".\n
525 * Examples: "9600/8n1", "600/7o2/dtr=1/rts=0" or "460800/8n1/flow=2".\n
526 * \<baudrate\>=integer Baud rate.\n
527 * \<bits\>=5|6|7|8 Number of data bits.\n
528 * \<parity\>=n|e|o None, even, odd.\n
529 * \<stopbits\>=1|2 One or two stop bits.\n
531 * dtr=0|1 Set DTR off resp. on.\n
532 * flow=0|1|2 Flow control. 0 for none, 1 for RTS/CTS, 2 for XON/XOFF.\n
533 * rts=0|1 Set RTS off resp. on.\n
534 * Please note that values and combinations of these parameters must be
535 * supported by the concrete serial interface hardware and the drivers for it.
537 * @retval SR_OK Success.
538 * @retval SR_ERR Failure.
542 SR_PRIV int serial_set_paramstr(struct sr_serial_dev_inst *serial,
543 const char *paramstr)
546 #define SERIAL_COMM_SPEC "^(\\d+)/([5678])([neo])([12])(.*)$"
551 int speed, databits, parity, stopbits, flow, rts, dtr, i;
552 char *mstr, **opts, **kv;
554 speed = databits = parity = stopbits = flow = 0;
556 sr_spew("Parsing parameters from \"%s\".", paramstr);
557 reg = g_regex_new(SERIAL_COMM_SPEC, 0, 0, NULL);
558 if (g_regex_match(reg, paramstr, 0, &match)) {
559 if ((mstr = g_match_info_fetch(match, 1)))
560 speed = strtoul(mstr, NULL, 10);
562 if ((mstr = g_match_info_fetch(match, 2)))
563 databits = strtoul(mstr, NULL, 10);
565 if ((mstr = g_match_info_fetch(match, 3))) {
568 parity = SP_PARITY_NONE;
571 parity = SP_PARITY_EVEN;
574 parity = SP_PARITY_ODD;
579 if ((mstr = g_match_info_fetch(match, 4)))
580 stopbits = strtoul(mstr, NULL, 10);
582 if ((mstr = g_match_info_fetch(match, 5)) && mstr[0] != '\0') {
583 if (mstr[0] != '/') {
584 sr_dbg("missing separator before extra options");
587 /* A set of "key=value" options separated by / */
588 opts = g_strsplit(mstr + 1, "/", 0);
589 for (i = 0; opts[i]; i++) {
590 kv = g_strsplit(opts[i], "=", 2);
591 if (!strncmp(kv[0], "rts", 3)) {
594 else if (kv[1][0] == '0')
597 sr_dbg("invalid value for rts: %c", kv[1][0]);
600 } else if (!strncmp(kv[0], "dtr", 3)) {
603 else if (kv[1][0] == '0')
606 sr_dbg("invalid value for dtr: %c", kv[1][0]);
609 } else if (!strncmp(kv[0], "flow", 4)) {
612 else if (kv[1][0] == '1')
614 else if (kv[1][0] == '2')
617 sr_dbg("invalid value for flow: %c", kv[1][0]);
628 g_match_info_unref(match);
632 return serial_set_params(serial, speed, databits, parity,
633 stopbits, flow, rts, dtr);
635 sr_dbg("Could not infer speed from parameter string.");
641 * Read a line from the specified serial port.
643 * @param[in] serial Previously initialized serial port structure.
644 * @param[out] buf Buffer where to store the bytes that are read.
645 * @param[in] buflen Size of the buffer.
646 * @param[in] timeout_ms How long to wait for a line to come in.
648 * Reading stops when CR or LF is found, which is stripped from the buffer.
650 * @retval SR_OK Success.
651 * @retval SR_ERR Failure.
655 SR_PRIV int serial_readline(struct sr_serial_dev_inst *serial,
656 char **buf, int *buflen, gint64 timeout_ms)
658 gint64 start, remaining;
662 sr_dbg("Invalid serial port.");
666 if (!dev_is_supported(serial)) {
667 sr_dbg("Cannot use unopened serial port %s.", serial->port);
671 start = g_get_monotonic_time();
672 remaining = timeout_ms;
677 len = maxlen - *buflen - 1;
680 len = serial_read_blocking(serial, *buf + *buflen, 1, remaining);
683 *(*buf + *buflen) = '\0';
684 if (*buflen > 0 && (*(*buf + *buflen - 1) == '\r'
685 || *(*buf + *buflen - 1) == '\n')) {
686 /* Strip CR/LF and terminate. */
687 *(*buf + --*buflen) = '\0';
691 /* Reduce timeout by time elapsed. */
692 remaining = timeout_ms - ((g_get_monotonic_time() - start) / 1000);
700 sr_dbg("Received %d: '%s'.", *buflen, *buf);
706 * Try to find a valid packet in a serial data stream.
708 * @param serial Previously initialized serial port structure.
709 * @param buf Buffer containing the bytes to write.
710 * @param buflen Size of the buffer.
711 * @param[in] packet_size Size, in bytes, of a valid packet.
712 * @param is_valid Callback that assesses whether the packet is valid or not.
713 * @param[in] timeout_ms The timeout after which, if no packet is detected, to
715 * @param[in] baudrate The baudrate of the serial port. This parameter is not
716 * critical, but it helps fine tune the serial port polling
719 * @retval SR_OK Valid packet was found within the given timeout.
720 * @retval SR_ERR Failure.
724 SR_PRIV int serial_stream_detect(struct sr_serial_dev_inst *serial,
725 uint8_t *buf, size_t *buflen,
727 packet_valid_callback is_valid,
728 uint64_t timeout_ms, int baudrate)
730 uint64_t start, time, byte_delay_us;
731 size_t ibuf, i, maxlen;
736 sr_dbg("Detecting packets on %s (timeout = %" PRIu64
737 "ms, baudrate = %d).", serial->port, timeout_ms, baudrate);
739 if (maxlen < (packet_size / 2) ) {
740 sr_err("Buffer size must be at least twice the packet size.");
744 /* Assume 8n1 transmission. That is 10 bits for every byte. */
745 byte_delay_us = 10 * ((1000 * 1000) / baudrate);
746 start = g_get_monotonic_time();
749 while (ibuf < maxlen) {
750 len = serial_read_nonblocking(serial, &buf[ibuf], 1);
753 } else if (len == 0) {
754 /* No logging, already done in serial_read(). */
756 /* Error reading byte, but continuing anyway. */
759 time = g_get_monotonic_time() - start;
762 if ((ibuf - i) >= packet_size) {
764 /* We have at least a packet's worth of data. */
765 text = sr_hexdump_new(&buf[i], packet_size);
766 sr_spew("Trying packet: %s", text->str);
767 sr_hexdump_free(text);
768 if (is_valid(&buf[i])) {
769 sr_spew("Found valid %zu-byte packet after "
770 "%" PRIu64 "ms.", (ibuf - i), time);
774 sr_spew("Got %zu bytes, but not a valid "
775 "packet.", (ibuf - i));
777 /* Not a valid packet. Continue searching. */
780 if (time >= timeout_ms) {
782 sr_dbg("Detection timed out after %" PRIu64 "ms.", time);
786 g_usleep(byte_delay_us);
791 sr_err("Didn't find a valid packet (read %zu bytes).", *buflen);
797 * Extract the serial device and options from the options linked list.
799 * @param options List of options passed from the command line.
800 * @param serial_device Pointer where to store the extracted serial device.
801 * @param serial_options Pointer where to store the optional extracted serial
804 * @return SR_OK if a serial_device is found, SR_ERR if no device is found. The
805 * returned string should not be freed by the caller.
809 SR_PRIV int sr_serial_extract_options(GSList *options,
810 const char **serial_device, const char **serial_options)
813 struct sr_config *src;
815 *serial_device = NULL;
817 for (l = options; l; l = l->next) {
821 *serial_device = g_variant_get_string(src->data, NULL);
822 sr_dbg("Parsed serial device: %s.", *serial_device);
824 case SR_CONF_SERIALCOMM:
825 *serial_options = g_variant_get_string(src->data, NULL);
826 sr_dbg("Parsed serial options: %s.", *serial_options);
831 if (!*serial_device) {
832 sr_dbg("No serial device specified.");
840 SR_PRIV int serial_source_add(struct sr_session *session,
841 struct sr_serial_dev_inst *serial, int events, int timeout,
842 sr_receive_data_callback cb, void *cb_data)
844 if ((events & (G_IO_IN | G_IO_ERR)) && (events & G_IO_OUT)) {
845 sr_err("Cannot poll input/error and output simultaneously.");
849 if (!dev_is_supported(serial)) {
850 sr_err("Invalid serial port.");
854 if (!serial->lib_funcs || !serial->lib_funcs->setup_source_add)
857 return serial->lib_funcs->setup_source_add(session, serial,
858 events, timeout, cb, cb_data);
862 SR_PRIV int serial_source_remove(struct sr_session *session,
863 struct sr_serial_dev_inst *serial)
865 if (!dev_is_supported(serial)) {
866 sr_err("Invalid serial port.");
870 if (!serial->lib_funcs || !serial->lib_funcs->setup_source_remove)
873 return serial->lib_funcs->setup_source_remove(session, serial);
877 * Create/allocate a new sr_serial_port structure.
879 * @param name The OS dependent name of the serial port. Must not be NULL.
880 * @param description An end user friendly description for the serial port.
881 * Can be NULL (in that case the empty string is used
884 * @return The newly allocated sr_serial_port struct.
886 static struct sr_serial_port *sr_serial_new(const char *name,
887 const char *description)
889 struct sr_serial_port *serial;
894 serial = g_malloc0(sizeof(*serial));
895 serial->name = g_strdup(name);
896 serial->description = g_strdup(description ? description : "");
902 * Free a previously allocated sr_serial_port structure.
904 * @param serial The sr_serial_port struct to free. Must not be NULL.
906 SR_API void sr_serial_free(struct sr_serial_port *serial)
910 g_free(serial->name);
911 g_free(serial->description);
915 static GSList *append_port_list(GSList *devs, const char *name, const char *desc)
917 return g_slist_append(devs, sr_serial_new(name, desc));
921 * List available serial devices.
923 * @return A GSList of strings containing the path of the serial devices or
924 * NULL if no serial device is found. The returned list must be freed
927 SR_API GSList *sr_serial_list(const struct sr_dev_driver *driver)
930 GSList *(*list_func)(GSList *list, sr_ser_list_append_t append);
932 /* Currently unused, but will be used by some drivers later on. */
936 if (ser_lib_funcs_libsp && ser_lib_funcs_libsp->list) {
937 list_func = ser_lib_funcs_libsp->list;
938 tty_devs = list_func(tty_devs, append_port_list);
940 if (ser_lib_funcs_hid && ser_lib_funcs_hid->list) {
941 list_func = ser_lib_funcs_hid->list;
942 tty_devs = list_func(tty_devs, append_port_list);
948 static GSList *append_port_find(GSList *devs, const char *name)
953 return g_slist_append(devs, g_strdup(name));
957 * Find USB serial devices via the USB vendor ID and product ID.
959 * @param[in] vendor_id Vendor ID of the USB device.
960 * @param[in] product_id Product ID of the USB device.
962 * @return A GSList of strings containing the path of the serial device or
963 * NULL if no serial device is found. The returned list must be freed
968 SR_PRIV GSList *sr_serial_find_usb(uint16_t vendor_id, uint16_t product_id)
971 GSList *(*find_func)(GSList *list, sr_ser_find_append_t append,
972 uint16_t vid, uint16_t pid);
975 if (ser_lib_funcs_libsp && ser_lib_funcs_libsp->find_usb) {
976 find_func = ser_lib_funcs_libsp->find_usb;
977 tty_devs = find_func(tty_devs, append_port_find,
978 vendor_id, product_id);
980 if (ser_lib_funcs_hid && ser_lib_funcs_hid->find_usb) {
981 find_func = ser_lib_funcs_hid->find_usb;
982 tty_devs = find_func(tty_devs, append_port_find,
983 vendor_id, product_id);
990 SR_PRIV int serial_timeout(struct sr_serial_dev_inst *port, int num_bytes)
996 /* Get the bitrate and frame length. */
998 if (port->lib_funcs && port->lib_funcs->get_frame_format) {
999 ret = port->lib_funcs->get_frame_format(port, &baud, &bits);
1003 baud = port->comm_params.bit_rate;
1004 bits = 1 + port->comm_params.data_bits +
1005 port->comm_params.parity_bits +
1006 port->comm_params.stop_bits;
1009 /* Derive the timeout. Default to 1s. */
1012 /* Throw in 10ms for misc OS overhead. */
1014 timeout_ms += ((1000.0 / baud) * bits) * num_bytes;
1022 /* TODO Put fallback.c content here? */