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);
94 /* Default to the libserialport transport layer. */
95 serial->lib_funcs = ser_lib_funcs_libsp;
96 if (!serial->lib_funcs)
100 * Run the transport's open routine. Setup the bitrate and the
103 if (!serial->lib_funcs->open)
105 ret = serial->lib_funcs->open(serial, flags);
109 if (serial->serialcomm)
110 return serial_set_paramstr(serial, serial->serialcomm);
116 * Close the specified serial port.
118 * @param serial Previously initialized serial port structure.
120 * @retval SR_OK Success.
121 * @retval SR_ERR Failure.
125 SR_PRIV int serial_close(struct sr_serial_dev_inst *serial)
128 sr_dbg("Invalid serial port.");
132 sr_spew("Closing serial port %s.", serial->port);
134 if (!serial->lib_funcs || !serial->lib_funcs->close)
137 return serial->lib_funcs->close(serial);
141 * Flush serial port buffers. Empty buffers, discard pending RX and TX data.
143 * @param serial Previously initialized serial port structure.
145 * @retval SR_OK Success.
146 * @retval SR_ERR Failure.
150 SR_PRIV int serial_flush(struct sr_serial_dev_inst *serial)
153 sr_dbg("Invalid serial port.");
157 sr_spew("Flushing serial port %s.", serial->port);
159 if (!serial->lib_funcs || !serial->lib_funcs->flush)
162 return serial->lib_funcs->flush(serial);
166 * Drain serial port buffers. Wait for pending TX data to be sent.
168 * @param serial Previously initialized serial port structure.
170 * @retval SR_OK Success.
171 * @retval SR_ERR Failure.
175 SR_PRIV int serial_drain(struct sr_serial_dev_inst *serial)
178 sr_dbg("Invalid serial port.");
182 sr_spew("Draining serial port %s.", serial->port);
184 if (!serial->lib_funcs || !serial->lib_funcs->drain)
187 return serial->lib_funcs->drain(serial);
191 * Check for available receive data.
193 * @param[in] serial Previously opened serial port instance.
195 * @returns The number of (known) available RX data bytes.
197 * Returns 0 if no receive data is available, or if the amount of
198 * available receive data cannot get determined.
200 SR_PRIV size_t serial_has_receive_data(struct sr_serial_dev_inst *serial)
208 if (serial->lib_funcs && serial->lib_funcs->get_rx_avail)
209 lib_count = serial->lib_funcs->get_rx_avail(serial);
214 static int _serial_write(struct sr_serial_dev_inst *serial,
215 const void *buf, size_t count,
216 int nonblocking, unsigned int timeout_ms)
221 sr_dbg("Invalid serial port.");
225 if (!serial->lib_funcs || !serial->lib_funcs->write)
227 ret = serial->lib_funcs->write(serial, buf, count,
228 nonblocking, timeout_ms);
229 sr_spew("Wrote %zd/%zu bytes.", ret, count);
235 * Write a number of bytes to the specified serial port, blocking until finished.
237 * @param serial Previously initialized serial port structure.
238 * @param[in] buf Buffer containing the bytes to write.
239 * @param[in] count Number of bytes to write.
240 * @param[in] timeout_ms Timeout in ms, or 0 for no timeout.
242 * @retval SR_ERR_ARG Invalid argument.
243 * @retval SR_ERR Other error.
244 * @retval other The number of bytes written. If this is less than the number
245 * specified in the call, the timeout was reached.
249 SR_PRIV int serial_write_blocking(struct sr_serial_dev_inst *serial,
250 const void *buf, size_t count, unsigned int timeout_ms)
252 return _serial_write(serial, buf, count, 0, timeout_ms);
256 * Write a number of bytes to the specified serial port, return immediately.
258 * @param serial Previously initialized serial port structure.
259 * @param[in] buf Buffer containing the bytes to write.
260 * @param[in] count Number of bytes to write.
262 * @retval SR_ERR_ARG Invalid argument.
263 * @retval SR_ERR Other error.
264 * @retval other The number of bytes written.
268 SR_PRIV int serial_write_nonblocking(struct sr_serial_dev_inst *serial,
269 const void *buf, size_t count)
271 return _serial_write(serial, buf, count, 1, 0);
274 static int _serial_read(struct sr_serial_dev_inst *serial,
275 void *buf, size_t count, int nonblocking, unsigned int timeout_ms)
280 sr_dbg("Invalid serial port.");
284 if (!serial->lib_funcs || !serial->lib_funcs->read)
286 ret = serial->lib_funcs->read(serial, buf, count,
287 nonblocking, timeout_ms);
289 sr_spew("Read %zd/%zu bytes.", ret, count);
295 * Read a number of bytes from the specified serial port, block until finished.
297 * @param serial Previously initialized serial port structure.
298 * @param buf Buffer where to store the bytes that are read.
299 * @param[in] count The number of bytes to read.
300 * @param[in] timeout_ms Timeout in ms, or 0 for no timeout.
302 * @retval SR_ERR_ARG Invalid argument.
303 * @retval SR_ERR Other error.
304 * @retval other The number of bytes read. If this is less than the number
305 * requested, the timeout was reached.
309 SR_PRIV int serial_read_blocking(struct sr_serial_dev_inst *serial,
310 void *buf, size_t count, unsigned int timeout_ms)
312 return _serial_read(serial, buf, count, 0, timeout_ms);
316 * Try to read up to @a count bytes from the specified serial port, return
317 * immediately with what's available.
319 * @param serial Previously initialized serial port structure.
320 * @param buf Buffer where to store the bytes that are read.
321 * @param[in] count The number of bytes to read.
323 * @retval SR_ERR_ARG Invalid argument.
324 * @retval SR_ERR Other error.
325 * @retval other The number of bytes read.
329 SR_PRIV int serial_read_nonblocking(struct sr_serial_dev_inst *serial,
330 void *buf, size_t count)
332 return _serial_read(serial, buf, count, 1, 0);
336 * Set serial parameters for the specified serial port.
338 * @param serial Previously initialized serial port structure.
339 * @param[in] baudrate The baudrate to set.
340 * @param[in] bits The number of data bits to use (5, 6, 7 or 8).
341 * @param[in] parity The parity setting to use (0 = none, 1 = even, 2 = odd).
342 * @param[in] stopbits The number of stop bits to use (1 or 2).
343 * @param[in] flowcontrol The flow control settings to use (0 = none,
344 * 1 = RTS/CTS, 2 = XON/XOFF).
345 * @param[in] rts Status of RTS line (0 or 1; required by some interfaces).
346 * @param[in] dtr Status of DTR line (0 or 1; required by some interfaces).
348 * @retval SR_OK Success.
349 * @retval SR_ERR Failure.
353 SR_PRIV int serial_set_params(struct sr_serial_dev_inst *serial,
354 int baudrate, int bits, int parity, int stopbits,
355 int flowcontrol, int rts, int dtr)
360 sr_dbg("Invalid serial port.");
364 sr_spew("Setting serial parameters on port %s.", serial->port);
366 if (!serial->lib_funcs || !serial->lib_funcs->set_params)
368 ret = serial->lib_funcs->set_params(serial,
369 baudrate, bits, parity, stopbits,
370 flowcontrol, rts, dtr);
372 serial->comm_params.bit_rate = baudrate;
373 serial->comm_params.data_bits = bits;
374 serial->comm_params.parity_bits = parity ? 1 : 0;
375 serial->comm_params.stop_bits = stopbits;
376 sr_dbg("DBG: %s() rate %d, %d%s%d", __func__,
378 (parity == 0) ? "n" : "x",
386 * Set serial parameters for the specified serial port from parameter string.
388 * @param serial Previously initialized serial port structure.
389 * @param[in] paramstr A serial communication parameters string of the form
390 * "<baudrate>/<bits><parity><stopbits>{/<option>}".\n
391 * Examples: "9600/8n1", "600/7o2/dtr=1/rts=0" or "460800/8n1/flow=2".\n
392 * \<baudrate\>=integer Baud rate.\n
393 * \<bits\>=5|6|7|8 Number of data bits.\n
394 * \<parity\>=n|e|o None, even, odd.\n
395 * \<stopbits\>=1|2 One or two stop bits.\n
397 * dtr=0|1 Set DTR off resp. on.\n
398 * flow=0|1|2 Flow control. 0 for none, 1 for RTS/CTS, 2 for XON/XOFF.\n
399 * rts=0|1 Set RTS off resp. on.\n
400 * Please note that values and combinations of these parameters must be
401 * supported by the concrete serial interface hardware and the drivers for it.
403 * @retval SR_OK Success.
404 * @retval SR_ERR Failure.
408 SR_PRIV int serial_set_paramstr(struct sr_serial_dev_inst *serial,
409 const char *paramstr)
412 #define SERIAL_COMM_SPEC "^(\\d+)/([5678])([neo])([12])(.*)$"
417 int speed, databits, parity, stopbits, flow, rts, dtr, i;
418 char *mstr, **opts, **kv;
420 speed = databits = parity = stopbits = flow = 0;
422 sr_spew("Parsing parameters from \"%s\".", paramstr);
423 reg = g_regex_new(SERIAL_COMM_SPEC, 0, 0, NULL);
424 if (g_regex_match(reg, paramstr, 0, &match)) {
425 if ((mstr = g_match_info_fetch(match, 1)))
426 speed = strtoul(mstr, NULL, 10);
428 if ((mstr = g_match_info_fetch(match, 2)))
429 databits = strtoul(mstr, NULL, 10);
431 if ((mstr = g_match_info_fetch(match, 3))) {
434 parity = SP_PARITY_NONE;
437 parity = SP_PARITY_EVEN;
440 parity = SP_PARITY_ODD;
445 if ((mstr = g_match_info_fetch(match, 4)))
446 stopbits = strtoul(mstr, NULL, 10);
448 if ((mstr = g_match_info_fetch(match, 5)) && mstr[0] != '\0') {
449 if (mstr[0] != '/') {
450 sr_dbg("missing separator before extra options");
453 /* A set of "key=value" options separated by / */
454 opts = g_strsplit(mstr + 1, "/", 0);
455 for (i = 0; opts[i]; i++) {
456 kv = g_strsplit(opts[i], "=", 2);
457 if (!strncmp(kv[0], "rts", 3)) {
460 else if (kv[1][0] == '0')
463 sr_dbg("invalid value for rts: %c", kv[1][0]);
466 } else if (!strncmp(kv[0], "dtr", 3)) {
469 else if (kv[1][0] == '0')
472 sr_dbg("invalid value for dtr: %c", kv[1][0]);
475 } else if (!strncmp(kv[0], "flow", 4)) {
478 else if (kv[1][0] == '1')
480 else if (kv[1][0] == '2')
483 sr_dbg("invalid value for flow: %c", kv[1][0]);
494 g_match_info_unref(match);
498 return serial_set_params(serial, speed, databits, parity,
499 stopbits, flow, rts, dtr);
501 sr_dbg("Could not infer speed from parameter string.");
507 * Read a line from the specified serial port.
509 * @param[in] serial Previously initialized serial port structure.
510 * @param[out] buf Buffer where to store the bytes that are read.
511 * @param[in] buflen Size of the buffer.
512 * @param[in] timeout_ms How long to wait for a line to come in.
514 * Reading stops when CR or LF is found, which is stripped from the buffer.
516 * @retval SR_OK Success.
517 * @retval SR_ERR Failure.
521 SR_PRIV int serial_readline(struct sr_serial_dev_inst *serial,
522 char **buf, int *buflen, gint64 timeout_ms)
524 gint64 start, remaining;
528 sr_dbg("Invalid serial port.");
532 if (!dev_is_supported(serial)) {
533 sr_dbg("Cannot use unopened serial port %s.", serial->port);
537 start = g_get_monotonic_time();
538 remaining = timeout_ms;
543 len = maxlen - *buflen - 1;
546 len = serial_read_blocking(serial, *buf + *buflen, 1, remaining);
549 *(*buf + *buflen) = '\0';
550 if (*buflen > 0 && (*(*buf + *buflen - 1) == '\r'
551 || *(*buf + *buflen - 1) == '\n')) {
552 /* Strip CR/LF and terminate. */
553 *(*buf + --*buflen) = '\0';
557 /* Reduce timeout by time elapsed. */
558 remaining = timeout_ms - ((g_get_monotonic_time() - start) / 1000);
566 sr_dbg("Received %d: '%s'.", *buflen, *buf);
572 * Try to find a valid packet in a serial data stream.
574 * @param serial Previously initialized serial port structure.
575 * @param buf Buffer containing the bytes to write.
576 * @param buflen Size of the buffer.
577 * @param[in] packet_size Size, in bytes, of a valid packet.
578 * @param is_valid Callback that assesses whether the packet is valid or not.
579 * @param[in] timeout_ms The timeout after which, if no packet is detected, to
581 * @param[in] baudrate The baudrate of the serial port. This parameter is not
582 * critical, but it helps fine tune the serial port polling
585 * @retval SR_OK Valid packet was found within the given timeout.
586 * @retval SR_ERR Failure.
590 SR_PRIV int serial_stream_detect(struct sr_serial_dev_inst *serial,
591 uint8_t *buf, size_t *buflen,
593 packet_valid_callback is_valid,
594 uint64_t timeout_ms, int baudrate)
596 uint64_t start, time, byte_delay_us;
597 size_t ibuf, i, maxlen;
602 sr_dbg("Detecting packets on %s (timeout = %" PRIu64
603 "ms, baudrate = %d).", serial->port, timeout_ms, baudrate);
605 if (maxlen < (packet_size / 2) ) {
606 sr_err("Buffer size must be at least twice the packet size.");
610 /* Assume 8n1 transmission. That is 10 bits for every byte. */
611 byte_delay_us = 10 * ((1000 * 1000) / baudrate);
612 start = g_get_monotonic_time();
615 while (ibuf < maxlen) {
616 len = serial_read_nonblocking(serial, &buf[ibuf], 1);
619 } else if (len == 0) {
620 /* No logging, already done in serial_read(). */
622 /* Error reading byte, but continuing anyway. */
625 time = g_get_monotonic_time() - start;
628 if ((ibuf - i) >= packet_size) {
630 /* We have at least a packet's worth of data. */
631 text = sr_hexdump_new(&buf[i], packet_size);
632 sr_spew("Trying packet: %s", text->str);
633 sr_hexdump_free(text);
634 if (is_valid(&buf[i])) {
635 sr_spew("Found valid %zu-byte packet after "
636 "%" PRIu64 "ms.", (ibuf - i), time);
640 sr_spew("Got %zu bytes, but not a valid "
641 "packet.", (ibuf - i));
643 /* Not a valid packet. Continue searching. */
646 if (time >= timeout_ms) {
648 sr_dbg("Detection timed out after %" PRIu64 "ms.", time);
652 g_usleep(byte_delay_us);
657 sr_err("Didn't find a valid packet (read %zu bytes).", *buflen);
663 * Extract the serial device and options from the options linked list.
665 * @param options List of options passed from the command line.
666 * @param serial_device Pointer where to store the extracted serial device.
667 * @param serial_options Pointer where to store the optional extracted serial
670 * @return SR_OK if a serial_device is found, SR_ERR if no device is found. The
671 * returned string should not be freed by the caller.
675 SR_PRIV int sr_serial_extract_options(GSList *options,
676 const char **serial_device, const char **serial_options)
679 struct sr_config *src;
681 *serial_device = NULL;
683 for (l = options; l; l = l->next) {
687 *serial_device = g_variant_get_string(src->data, NULL);
688 sr_dbg("Parsed serial device: %s.", *serial_device);
690 case SR_CONF_SERIALCOMM:
691 *serial_options = g_variant_get_string(src->data, NULL);
692 sr_dbg("Parsed serial options: %s.", *serial_options);
697 if (!*serial_device) {
698 sr_dbg("No serial device specified.");
706 SR_PRIV int serial_source_add(struct sr_session *session,
707 struct sr_serial_dev_inst *serial, int events, int timeout,
708 sr_receive_data_callback cb, void *cb_data)
710 if ((events & (G_IO_IN | G_IO_ERR)) && (events & G_IO_OUT)) {
711 sr_err("Cannot poll input/error and output simultaneously.");
715 if (!dev_is_supported(serial)) {
716 sr_err("Invalid serial port.");
720 if (!serial->lib_funcs || !serial->lib_funcs->setup_source_add)
723 return serial->lib_funcs->setup_source_add(session, serial,
724 events, timeout, cb, cb_data);
728 SR_PRIV int serial_source_remove(struct sr_session *session,
729 struct sr_serial_dev_inst *serial)
731 if (!dev_is_supported(serial)) {
732 sr_err("Invalid serial port.");
736 if (!serial->lib_funcs || !serial->lib_funcs->setup_source_remove)
739 return serial->lib_funcs->setup_source_remove(session, serial);
743 * Create/allocate a new sr_serial_port structure.
745 * @param name The OS dependent name of the serial port. Must not be NULL.
746 * @param description An end user friendly description for the serial port.
747 * Can be NULL (in that case the empty string is used
750 * @return The newly allocated sr_serial_port struct.
752 static struct sr_serial_port *sr_serial_new(const char *name,
753 const char *description)
755 struct sr_serial_port *serial;
760 serial = g_malloc0(sizeof(*serial));
761 serial->name = g_strdup(name);
762 serial->description = g_strdup(description ? description : "");
768 * Free a previously allocated sr_serial_port structure.
770 * @param serial The sr_serial_port struct to free. Must not be NULL.
772 SR_API void sr_serial_free(struct sr_serial_port *serial)
776 g_free(serial->name);
777 g_free(serial->description);
781 static GSList *append_port_list(GSList *devs, const char *name, const char *desc)
783 return g_slist_append(devs, sr_serial_new(name, desc));
787 * List available serial devices.
789 * @return A GSList of strings containing the path of the serial devices or
790 * NULL if no serial device is found. The returned list must be freed
793 SR_API GSList *sr_serial_list(const struct sr_dev_driver *driver)
796 GSList *(*list_func)(GSList *list, sr_ser_list_append_t append);
798 /* Currently unused, but will be used by some drivers later on. */
802 if (ser_lib_funcs_libsp && ser_lib_funcs_libsp->list) {
803 list_func = ser_lib_funcs_libsp->list;
804 tty_devs = list_func(tty_devs, append_port_list);
810 static GSList *append_port_find(GSList *devs, const char *name)
815 return g_slist_append(devs, g_strdup(name));
819 * Find USB serial devices via the USB vendor ID and product ID.
821 * @param[in] vendor_id Vendor ID of the USB device.
822 * @param[in] product_id Product ID of the USB device.
824 * @return A GSList of strings containing the path of the serial device or
825 * NULL if no serial device is found. The returned list must be freed
830 SR_PRIV GSList *sr_serial_find_usb(uint16_t vendor_id, uint16_t product_id)
833 GSList *(*find_func)(GSList *list, sr_ser_find_append_t append,
834 uint16_t vid, uint16_t pid);
837 if (ser_lib_funcs_libsp && ser_lib_funcs_libsp->find_usb) {
838 find_func = ser_lib_funcs_libsp->find_usb;
839 tty_devs = find_func(tty_devs, append_port_find,
840 vendor_id, product_id);
847 SR_PRIV int serial_timeout(struct sr_serial_dev_inst *port, int num_bytes)
853 /* Get the bitrate and frame length. */
855 if (port->lib_funcs && port->lib_funcs->get_frame_format) {
856 ret = port->lib_funcs->get_frame_format(port, &baud, &bits);
860 baud = port->comm_params.bit_rate;
861 bits = 1 + port->comm_params.data_bits +
862 port->comm_params.parity_bits +
863 port->comm_params.stop_bits;
866 /* Derive the timeout. Default to 1s. */
869 /* Throw in 10ms for misc OS overhead. */
871 timeout_ms += ((1000.0 / baud) * bits) * num_bytes;
879 /* TODO Put fallback.c content here? */