2 * This file is part of the sigrok 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/>.
23 #include <sys/types.h>
32 #include <sys/ioctl.h>
37 #include "libsigrok.h"
38 #include "libsigrok-internal.h"
40 /* Message logging helpers with driver-specific prefix string. */
41 #define DRIVER_LOG_DOMAIN "serial: "
42 #define sr_log(l, s, args...) sr_log(l, DRIVER_LOG_DOMAIN s, ## args)
43 #define sr_spew(s, args...) sr_spew(DRIVER_LOG_DOMAIN s, ## args)
44 #define sr_dbg(s, args...) sr_dbg(DRIVER_LOG_DOMAIN s, ## args)
45 #define sr_info(s, args...) sr_info(DRIVER_LOG_DOMAIN s, ## args)
46 #define sr_warn(s, args...) sr_warn(DRIVER_LOG_DOMAIN s, ## args)
47 #define sr_err(s, args...) sr_err(DRIVER_LOG_DOMAIN s, ## args)
49 // FIXME: Must be moved, or rather passed as function argument.
55 * Open the specified serial port.
57 * @param serial Previously initialized serial port structure.
58 * @param flags Flags to use when opening the serial port. Possible flags
59 * include SERIAL_RDWR, SERIAL_RDONLY, SERIAL_NONBLOCK.
61 * If the serial structure contains a serialcomm string, it will be
62 * passed to serial_set_paramstr() after the port is opened.
64 * @return SR_OK on success, SR_ERR on failure.
66 SR_PRIV int serial_open(struct sr_serial_dev_inst *serial, int flags)
70 DWORD desired_access = 0, flags_and_attributes = 0;
74 sr_dbg("Invalid serial port.");
78 sr_spew("Opening serial port '%s' (flags %d).", serial->port, flags);
81 /* Map 'flags' to the OS-specific settings. */
82 desired_access |= GENERIC_READ;
83 flags_and_attributes = FILE_ATTRIBUTE_NORMAL;
84 if (flags & SERIAL_RDWR)
85 desired_access |= GENERIC_WRITE;
86 if (flags & SERIAL_NONBLOCK)
87 flags_and_attributes |= FILE_FLAG_OVERLAPPED;
89 hdl = CreateFile(serial->port, desired_access, 0, 0,
90 OPEN_EXISTING, flags_and_attributes, 0);
91 if (hdl == INVALID_HANDLE_VALUE) {
92 sr_err("Error opening serial port '%s'.", serial->port);
96 /* Map 'flags' to the OS-specific settings. */
97 if (flags & SERIAL_RDWR)
98 flags_local |= O_RDWR;
99 if (flags & SERIAL_RDONLY)
100 flags_local |= O_RDONLY;
101 if (flags & SERIAL_NONBLOCK)
102 flags_local |= O_NONBLOCK;
104 if ((serial->fd = open(serial->port, flags_local)) < 0) {
105 sr_err("Error opening serial port '%s': %s.", serial->port,
110 sr_spew("Opened serial port '%s' (fd %d).", serial->port, serial->fd);
113 if (serial->serialcomm)
114 return serial_set_paramstr(serial, serial->serialcomm);
120 * Close the specified serial port.
122 * @param serial Previously initialized serial port structure.
124 * @return SR_OK on success, SR_ERR on failure.
126 SR_PRIV int serial_close(struct sr_serial_dev_inst *serial)
131 sr_dbg("Invalid serial port.");
135 if (serial->fd == -1) {
136 sr_dbg("Cannot close unopened serial port %s (fd %d).",
137 serial->port, serial->fd);
141 sr_spew("Closing serial port %s (fd %d).", serial->port, serial->fd);
145 /* Returns non-zero upon success, 0 upon failure. */
146 if (CloseHandle(hdl) == 0)
149 /* Returns 0 upon success, -1 upon failure. */
150 if (close(serial->fd) < 0) {
151 sr_err("Error closing serial port: %s (fd %d).", strerror(errno),
163 * Flush serial port buffers.
165 * @param serial Previously initialized serial port structure.
167 * @return SR_OK on success, SR_ERR on failure.
169 SR_PRIV int serial_flush(struct sr_serial_dev_inst *serial)
174 sr_dbg("Invalid serial port.");
178 if (serial->fd == -1) {
179 sr_dbg("Cannot flush unopened serial port %s (fd %d).",
180 serial->port, serial->fd);
184 sr_spew("Flushing serial port %s (fd %d).", serial->port, serial->fd);
188 /* Returns non-zero upon success, 0 upon failure. */
189 if (PurgeComm(hdl, PURGE_RXCLEAR | PURGE_TXCLEAR) == 0) {
190 sr_err("Error flushing serial port: %s.", strerror(errno));
194 /* Returns 0 upon success, -1 upon failure. */
195 if (tcflush(serial->fd, TCIOFLUSH) < 0) {
196 sr_err("Error flushing serial port: %s.", strerror(errno));
205 * Write a number of bytes to the specified serial port.
207 * @param serial Previously initialized serial port structure.
208 * @param buf Buffer containing the bytes to write.
209 * @param count Number of bytes to write.
211 * @return The number of bytes written, or -1 upon failure.
213 SR_PRIV int serial_write(struct sr_serial_dev_inst *serial,
214 const void *buf, size_t count)
219 sr_dbg("Invalid serial port.");
223 if (serial->fd == -1) {
224 sr_dbg("Cannot use unopened serial port %s (fd %d).",
225 serial->port, serial->fd);
233 /* Returns non-zero upon success, 0 upon failure. */
234 WriteFile(hdl, buf, count, &tmp, NULL);
236 /* Returns the number of bytes written, or -1 upon failure. */
237 ret = write(serial->fd, buf, count);
239 sr_err("Write error: %s.", strerror(errno));
241 sr_spew("Wrote %d/%d bytes (fd %d).", ret, count, serial->fd);
248 * Read a number of bytes from the specified serial port.
250 * @param serial Previously initialized serial port structure.
251 * @param buf Buffer where to store the bytes that are read.
252 * @param count The number of bytes to read.
254 * @return The number of bytes read, or -1 upon failure.
256 SR_PRIV int serial_read(struct sr_serial_dev_inst *serial, void *buf,
262 sr_dbg("Invalid serial port.");
266 if (serial->fd == -1) {
267 sr_dbg("Cannot use unopened serial port %s (fd %d).",
268 serial->port, serial->fd);
276 /* Returns non-zero upon success, 0 upon failure. */
277 return ReadFile(hdl, buf, count, &tmp, NULL);
279 /* Returns the number of bytes read, or -1 upon failure. */
280 ret = read(serial->fd, buf, count);
282 sr_spew("Read %d/%d bytes (fd %d).", ret, count, serial->fd);
289 * Set serial parameters for the specified serial port.
291 * @param serial Previously initialized serial port structure.
292 * @param baudrate The baudrate to set.
293 * @param bits The number of data bits to use.
294 * @param parity The parity setting to use (0 = none, 1 = even, 2 = odd).
295 * @param stopbits The number of stop bits to use (1 or 2).
296 * @param flowcontrol The flow control settings to use (0 = none, 1 = RTS/CTS,
299 * @return SR_OK upon success, SR_ERR upon failure.
301 SR_PRIV int serial_set_params(struct sr_serial_dev_inst *serial, int baudrate,
302 int bits, int parity, int stopbits,
303 int flowcontrol, int rts, int dtr)
306 sr_dbg("Invalid serial port.");
310 if (serial->fd == -1) {
311 sr_dbg("Cannot configure unopened serial port %s (fd %d).",
312 serial->port, serial->fd);
316 sr_spew("Setting serial parameters on port %s (fd %d).", serial->port,
322 if (!GetCommState(hdl, &dcb)) {
323 sr_err("Failed to get comm state on port %s (fd %d): %d.",
324 serial->port, serial->fd, GetLastError());
330 * The baudrates 50/75/134/150/200/1800/230400/460800 do not seem to
331 * have documented CBR_* macros.
334 dcb.BaudRate = CBR_110;
337 dcb.BaudRate = CBR_300;
340 dcb.BaudRate = CBR_600;
343 dcb.BaudRate = CBR_1200;
346 dcb.BaudRate = CBR_2400;
349 dcb.BaudRate = CBR_4800;
352 dcb.BaudRate = CBR_9600;
355 dcb.BaudRate = CBR_14400; /* Not available on Unix? */
358 dcb.BaudRate = CBR_19200;
361 dcb.BaudRate = CBR_38400;
364 dcb.BaudRate = CBR_57600;
367 dcb.BaudRate = CBR_115200;
370 dcb.BaudRate = CBR_128000; /* Not available on Unix? */
373 dcb.BaudRate = CBR_256000; /* Not available on Unix? */
376 sr_err("Unsupported baudrate: %d.", baudrate);
379 sr_spew("Configuring baudrate to %d (%d).", baudrate, dcb.BaudRate);
381 sr_spew("Configuring %d data bits.", bits);
384 sr_spew("Configuring %d stop bits.", stopbits);
386 /* Note: There's also ONE5STOPBITS == 1.5 (unneeded so far). */
388 dcb.StopBits = ONESTOPBIT;
391 dcb.StopBits = TWOSTOPBITS;
394 sr_err("Unsupported stopbits number: %d.", stopbits);
399 /* Note: There's also SPACEPARITY, MARKPARITY (unneeded so far). */
400 case SERIAL_PARITY_NONE:
401 sr_spew("Configuring no parity.");
402 dcb.Parity = NOPARITY;
404 case SERIAL_PARITY_EVEN:
405 sr_spew("Configuring even parity.");
406 dcb.Parity = EVENPARITY;
408 case SERIAL_PARITY_ODD:
409 sr_spew("Configuring odd parity.");
410 dcb.Parity = ODDPARITY;
413 sr_err("Unsupported parity setting: %d.", parity);
418 sr_spew("Setting RTS %s.", rts ? "high" : "low");
420 dcb.fRtsControl = RTS_CONTROL_ENABLE;
422 dcb.fRtsControl = RTS_CONTROL_DISABLE;
426 sr_spew("Setting DTR %s.", dtr ? "high" : "low");
428 dcb.fDtrControl = DTR_CONTROL_ENABLE;
430 dcb.fDtrControl = DTR_CONTROL_DISABLE;
433 if (!SetCommState(hdl, &dcb)) {
434 sr_err("Failed to set comm state on port %s (fd %d): %d.",
435 serial->port, serial->fd, GetLastError());
441 int ret, controlbits;
443 if (tcgetattr(serial->fd, &term) < 0) {
444 sr_err("tcgetattr() error on port %s (fd %d): %s.",
445 serial->port, serial->fd, strerror(errno));
510 sr_err("Unsupported baudrate: %d.", baudrate);
514 sr_spew("Configuring output baudrate to %d (%d).", baudrate, baud);
515 if (cfsetospeed(&term, baud) < 0) {
516 sr_err("cfsetospeed() error: %s.", strerror(errno));
520 sr_spew("Configuring input baudrate to %d (%d).", baudrate, baud);
521 if (cfsetispeed(&term, baud) < 0) {
522 sr_err("cfsetispeed() error: %s.", strerror(errno));
526 sr_spew("Configuring %d data bits.", bits);
527 term.c_cflag &= ~CSIZE;
536 sr_err("Unsupported data bits number %d.", bits);
540 sr_spew("Configuring %d stop bits.", stopbits);
541 term.c_cflag &= ~CSTOPB;
544 term.c_cflag &= ~CSTOPB;
547 term.c_cflag |= CSTOPB;
550 sr_err("Unsupported stopbits number %d.", stopbits);
554 term.c_iflag &= ~(IXON | IXOFF);
555 term.c_cflag &= ~CRTSCTS;
556 switch (flowcontrol) {
558 /* No flow control. */
559 sr_spew("Configuring no flow control.");
562 sr_spew("Configuring RTS/CTS flow control.");
563 term.c_cflag |= CRTSCTS;
566 sr_spew("Configuring XON/XOFF flow control.");
567 term.c_iflag |= IXON | IXOFF;
570 sr_err("Unsupported flow control setting %d.", flowcontrol);
574 term.c_iflag &= ~IGNPAR;
575 term.c_cflag &= ~(PARODD | PARENB);
577 case SERIAL_PARITY_NONE:
578 sr_spew("Configuring no parity.");
579 term.c_iflag |= IGNPAR;
581 case SERIAL_PARITY_EVEN:
582 sr_spew("Configuring even parity.");
583 term.c_cflag |= PARENB;
585 case SERIAL_PARITY_ODD:
586 sr_spew("Configuring odd parity.");
587 term.c_cflag |= PARENB | PARODD;
590 sr_err("Unsupported parity setting %d.", parity);
594 /* Do not translate carriage return to newline on input. */
595 term.c_iflag &= ~(ICRNL);
597 /* Disable canonical mode, and don't echo input characters. */
598 term.c_lflag &= ~(ICANON | ECHO);
600 /* Write the configured settings. */
601 if (tcsetattr(serial->fd, TCSADRAIN, &term) < 0) {
602 sr_err("tcsetattr() error: %s.", strerror(errno));
607 sr_spew("Setting RTS %s.", rts ? "high" : "low");
608 controlbits = TIOCM_RTS;
609 if ((ret = ioctl(serial->fd, rts ? TIOCMBIS : TIOCMBIC,
610 &controlbits)) < 0) {
611 sr_err("Error setting RTS: %s.", strerror(errno));
617 sr_spew("Setting DTR %s.", dtr ? "high" : "low");
618 controlbits = TIOCM_DTR;
619 if ((ret = ioctl(serial->fd, dtr ? TIOCMBIS : TIOCMBIC,
620 &controlbits)) < 0) {
621 sr_err("Error setting DTR: %s.", strerror(errno));
632 * Set serial parameters for the specified serial port.
634 * @param serial Previously initialized serial port structure.
635 * @param paramstr A serial communication parameters string, in the form
636 * of <speed>/<data bits><parity><stopbits>, for example "9600/8n1" or
639 * @return SR_OK upon success, SR_ERR upon failure.
641 #define SERIAL_COMM_SPEC "^(\\d+)/([78])([neo])([12])(.*)$"
642 SR_PRIV int serial_set_paramstr(struct sr_serial_dev_inst *serial,
643 const char *paramstr)
647 int speed, databits, parity, stopbits, rts, dtr, i;
648 char *mstr, **opts, **kv;
650 speed = databits = parity = stopbits = 0;
652 sr_spew("Parsing parameters from \"%s\".", paramstr);
653 reg = g_regex_new(SERIAL_COMM_SPEC, 0, 0, NULL);
654 if (g_regex_match(reg, paramstr, 0, &match)) {
655 if ((mstr = g_match_info_fetch(match, 1)))
656 speed = strtoul(mstr, NULL, 10);
658 if ((mstr = g_match_info_fetch(match, 2)))
659 databits = strtoul(mstr, NULL, 10);
661 if ((mstr = g_match_info_fetch(match, 3))) {
664 parity = SERIAL_PARITY_NONE;
667 parity = SERIAL_PARITY_EVEN;
670 parity = SERIAL_PARITY_ODD;
675 if ((mstr = g_match_info_fetch(match, 4)))
676 stopbits = strtoul(mstr, NULL, 10);
678 if ((mstr = g_match_info_fetch(match, 5)) && mstr[0] != '\0') {
679 if (mstr[0] != '/') {
680 sr_dbg("missing separator before extra options");
683 /* A set of "key=value" options separated by / */
684 opts = g_strsplit(mstr + 1, "/", 0);
685 for (i = 0; opts[i]; i++) {
686 kv = g_strsplit(opts[i], "=", 2);
687 if (!strncmp(kv[0], "rts", 3)) {
690 else if (kv[1][0] == '0')
693 sr_dbg("invalid value for rts: %c", kv[1][0]);
696 } else if (!strncmp(kv[0], "dtr", 3)) {
699 else if (kv[1][0] == '0')
702 sr_dbg("invalid value for dtr: %c", kv[1][0]);
713 g_match_info_unref(match);
717 return serial_set_params(serial, speed, databits, parity,
718 stopbits, 0, rts, dtr);
720 sr_dbg("Could not infer speed from parameter string.");
726 * Read a line from the specified serial port.
728 * @param serial Previously initialized serial port structure.
729 * @param buf Buffer where to store the bytes that are read.
730 * @param buflen Size of the buffer.
731 * @param timeout_ms How long to wait for a line to come in.
733 * Reading stops when CR of LR is found, which is stripped from the buffer.
735 * @return SR_OK on success, SR_ERR on failure.
737 SR_PRIV int serial_readline(struct sr_serial_dev_inst *serial, char **buf,
738 int *buflen, gint64 timeout_ms)
743 if (!serial || serial->fd == -1) {
744 sr_dbg("Invalid serial port.");
748 if (serial->fd == -1) {
749 sr_dbg("Cannot use unopened serial port %s (fd %d).",
750 serial->port, serial->fd);
755 start = g_get_monotonic_time();
760 len = maxlen - *buflen - 1;
763 len = serial_read(serial, *buf + *buflen, 1);
766 *(*buf + *buflen) = '\0';
767 if (*buflen > 0 && (*(*buf + *buflen - 1) == '\r'
768 || *(*buf + *buflen - 1) == '\n')) {
769 /* Strip CR/LF and terminate. */
770 *(*buf + --*buflen) = '\0';
774 if (g_get_monotonic_time() - start > timeout_ms)
780 sr_dbg("Received %d: '%s'.", *buflen, *buf);
786 * Try to find a valid packet in a serial data stream.
788 * @param serial Previously initialized serial port structure.
789 * @param buf Buffer containing the bytes to write.
790 * @param count Size of the buffer.
791 * @param packet_size Size, in bytes, of a valid packet.
792 * @param is_valid Callback that assesses whether the packet is valid or not.
793 * @param timeout_ms The timeout after which, if no packet is detected, to
795 * @param baudrate The baudrate of the serial port. This parameter is not
796 * critical, but it helps fine tune the serial port polling
799 * @return SR_OK if a valid packet is found within the given timeout,
800 * SR_ERR upon failure.
802 SR_PRIV int serial_stream_detect(struct sr_serial_dev_inst *serial,
803 uint8_t *buf, size_t *buflen,
804 size_t packet_size, packet_valid_t is_valid,
805 uint64_t timeout_ms, int baudrate)
807 uint64_t start, time, byte_delay_us;
808 size_t ibuf, i, maxlen;
813 sr_dbg("Detecting packets on FD %d (timeout = %" PRIu64
814 "ms, baudrate = %d).", serial->fd, timeout_ms, baudrate);
816 if (maxlen < (packet_size / 2) ) {
817 sr_err("Buffer size must be at least twice the packet size.");
821 /* Assume 8n1 transmission. That is 10 bits for every byte. */
822 byte_delay_us = 10 * (1000000 / baudrate);
823 start = g_get_monotonic_time();
826 while (ibuf < maxlen) {
827 len = serial_read(serial, &buf[ibuf], 1);
830 } else if (len == 0) {
831 /* No logging, already done in serial_read(). */
833 /* Error reading byte, but continuing anyway. */
836 time = g_get_monotonic_time() - start;
839 if ((ibuf - i) >= packet_size) {
840 /* We have at least a packet's worth of data. */
841 if (is_valid(&buf[i])) {
842 sr_spew("Found valid %d-byte packet after "
843 "%" PRIu64 "ms.", (ibuf - i), time);
847 sr_spew("Got %d bytes, but not a valid "
848 "packet.", (ibuf - i));
850 /* Not a valid packet. Continue searching. */
853 if (time >= timeout_ms) {
855 sr_dbg("Detection timed out after %dms.", time);
858 g_usleep(byte_delay_us);
863 sr_err("Didn't find a valid packet (read %d bytes).", *buflen);