X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=src%2Fserial.c;h=0a60d3f14a496761516a4d627baaa97ad52c44db;hb=2cb63065f525655d3abccc1b26edd7275937b034;hp=9a9a0d94fd3b3058e84ba74202db681de8397885;hpb=155b680da482cea2381becb73c51cfb838bff31e;p=libsigrok.git diff --git a/src/serial.c b/src/serial.c index 9a9a0d94..0a60d3f1 100644 --- a/src/serial.c +++ b/src/serial.c @@ -4,6 +4,7 @@ * Copyright (C) 2010-2012 Bert Vermeulen * Copyright (C) 2010-2012 Uwe Hermann * Copyright (C) 2012 Alexandru Gagniuc + * Copyright (C) 2014 Uffe Jakobsen * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -27,20 +28,38 @@ #include "libsigrok.h" #include "libsigrok-internal.h" +/** @cond PRIVATE */ #define LOG_PREFIX "serial" +/** @endcond */ + +/** + * @file + * + * Serial port handling. + */ + +/** + * @defgroup grp_serial Serial port handling + * + * Serial port handling functions. + * + * @{ + */ /** * Open the specified serial port. * * @param serial Previously initialized serial port structure. * @param[in] flags Flags to use when opening the serial port. Possible flags - * include SERIAL_RDWR, SERIAL_RDONLY, SERIAL_NONBLOCK. + * include SERIAL_RDWR, SERIAL_RDONLY. * * If the serial structure contains a serialcomm string, it will be * passed to serial_set_paramstr() after the port is opened. * * @retval SR_OK Success. * @retval SR_ERR Failure. + * + * @private */ SR_PRIV int serial_open(struct sr_serial_dev_inst *serial, int flags) { @@ -62,8 +81,6 @@ SR_PRIV int serial_open(struct sr_serial_dev_inst *serial, int flags) else if (flags & SERIAL_RDONLY) sp_flags = SP_MODE_READ; - serial->nonblocking = (flags & SERIAL_NONBLOCK) ? 1 : 0; - ret = sp_open(serial->data, sp_flags); switch (ret) { @@ -91,6 +108,8 @@ SR_PRIV int serial_open(struct sr_serial_dev_inst *serial, int flags) * * @retval SR_OK Success. * @retval SR_ERR Failure. + * + * @private */ SR_PRIV int serial_close(struct sr_serial_dev_inst *serial) { @@ -136,6 +155,8 @@ SR_PRIV int serial_close(struct sr_serial_dev_inst *serial) * * @retval SR_OK Success. * @retval SR_ERR Failure. + * + * @private */ SR_PRIV int serial_flush(struct sr_serial_dev_inst *serial) { @@ -171,8 +192,48 @@ SR_PRIV int serial_flush(struct sr_serial_dev_inst *serial) return SR_OK; } +/** + * Drain serial port buffers. + * + * @param serial Previously initialized serial port structure. + * + * @retval SR_OK Success. + * @retval SR_ERR Failure. + * + * @private + */ +SR_PRIV int serial_drain(struct sr_serial_dev_inst *serial) +{ + int ret; + char *error; + + if (!serial) { + sr_dbg("Invalid serial port."); + return SR_ERR; + } + + if (!serial->data) { + sr_dbg("Cannot drain unopened serial port %s.", serial->port); + return SR_ERR; + } + + sr_spew("Draining serial port %s.", serial->port); + + ret = sp_drain(serial->data); + + if (ret == SP_ERR_FAIL) { + error = sp_last_error_message(); + sr_err("Error draining port (%d): %s.", + sp_last_error_code(), error); + sp_free_error_message(error); + return SR_ERR; + } + + return SR_OK; +} + static int _serial_write(struct sr_serial_dev_inst *serial, - const void *buf, size_t count, int nonblocking) + const void *buf, size_t count, int nonblocking, unsigned int timeout_ms) { ssize_t ret; char *error; @@ -190,7 +251,7 @@ static int _serial_write(struct sr_serial_dev_inst *serial, if (nonblocking) ret = sp_nonblocking_write(serial->data, buf, count); else - ret = sp_blocking_write(serial->data, buf, count, 0); + ret = sp_blocking_write(serial->data, buf, count, timeout_ms); switch (ret) { case SP_ERR_ARG: @@ -209,44 +270,47 @@ static int _serial_write(struct sr_serial_dev_inst *serial, } /** - * Write a number of bytes to the specified serial port. + * Write a number of bytes to the specified serial port, blocking until finished. * * @param serial Previously initialized serial port structure. * @param[in] buf Buffer containing the bytes to write. * @param[in] count Number of bytes to write. + * @param[in] timeout_ms Timeout in ms, or 0 for no timeout. * * @retval SR_ERR_ARG Invalid argument. * @retval SR_ERR Other error. - * @retval other The number of bytes written. - */ -SR_PRIV int serial_write(struct sr_serial_dev_inst *serial, - const void *buf, size_t count) -{ - return _serial_write(serial, buf, count, serial->nonblocking); -} - -/** - * Write a number of bytes to the specified serial port, blocking until finished. - * @copydetails serial_write() + * @retval other The number of bytes written. If this is less than the number + * specified in the call, the timeout was reached. + * + * @private */ SR_PRIV int serial_write_blocking(struct sr_serial_dev_inst *serial, - const void *buf, size_t count) + const void *buf, size_t count, unsigned int timeout_ms) { - return _serial_write(serial, buf, count, 0); + return _serial_write(serial, buf, count, 0, timeout_ms); } /** * Write a number of bytes to the specified serial port, return immediately. - * @copydetails serial_write() -*/ + * + * @param serial Previously initialized serial port structure. + * @param[in] buf Buffer containing the bytes to write. + * @param[in] count Number of bytes to write. + * + * @retval SR_ERR_ARG Invalid argument. + * @retval SR_ERR Other error. + * @retval other The number of bytes written. + * + * @private + */ SR_PRIV int serial_write_nonblocking(struct sr_serial_dev_inst *serial, const void *buf, size_t count) { - return _serial_write(serial, buf, count, 1); + return _serial_write(serial, buf, count, 1, 0); } static int _serial_read(struct sr_serial_dev_inst *serial, void *buf, - size_t count, int nonblocking) + size_t count, int nonblocking, unsigned int timeout_ms) { ssize_t ret; char *error; @@ -264,7 +328,7 @@ static int _serial_read(struct sr_serial_dev_inst *serial, void *buf, if (nonblocking) ret = sp_nonblocking_read(serial->data, buf, count); else - ret = sp_blocking_read(serial->data, buf, count, 0); + ret = sp_blocking_read(serial->data, buf, count, timeout_ms); switch (ret) { case SP_ERR_ARG: @@ -284,41 +348,44 @@ static int _serial_read(struct sr_serial_dev_inst *serial, void *buf, } /** - * Read a number of bytes from the specified serial port. + * Read a number of bytes from the specified serial port, block until finished. * * @param serial Previously initialized serial port structure. * @param buf Buffer where to store the bytes that are read. * @param[in] count The number of bytes to read. + * @param[in] timeout_ms Timeout in ms, or 0 for no timeout. * * @retval SR_ERR_ARG Invalid argument. * @retval SR_ERR Other error. - * @retval other The number of bytes read. - */ -SR_PRIV int serial_read(struct sr_serial_dev_inst *serial, void *buf, - size_t count) -{ - return _serial_read(serial, buf, count, serial->nonblocking); -} - -/** - * Read a number of bytes from the specified serial port, block until finished. - * @copydetails serial_read() + * @retval other The number of bytes read. If this is less than the number + * requested, the timeout was reached. + * + * @private */ SR_PRIV int serial_read_blocking(struct sr_serial_dev_inst *serial, void *buf, - size_t count) + size_t count, unsigned int timeout_ms) { - return _serial_read(serial, buf, count, 0); + return _serial_read(serial, buf, count, 0, timeout_ms); } /** * Try to read up to @a count bytes from the specified serial port, return * immediately with what's available. - * @copydetails serial_read() + * + * @param serial Previously initialized serial port structure. + * @param buf Buffer where to store the bytes that are read. + * @param[in] count The number of bytes to read. + * + * @retval SR_ERR_ARG Invalid argument. + * @retval SR_ERR Other error. + * @retval other The number of bytes read. + * + * @private */ SR_PRIV int serial_read_nonblocking(struct sr_serial_dev_inst *serial, void *buf, size_t count) { - return _serial_read(serial, buf, count, 1); + return _serial_read(serial, buf, count, 1, 0); } /** @@ -336,6 +403,8 @@ SR_PRIV int serial_read_nonblocking(struct sr_serial_dev_inst *serial, void *buf * * @retval SR_OK Success. * @retval SR_ERR Failure. + * + * @private */ SR_PRIV int serial_set_params(struct sr_serial_dev_inst *serial, int baudrate, int bits, int parity, int stopbits, @@ -415,13 +484,18 @@ SR_PRIV int serial_set_params(struct sr_serial_dev_inst *serial, int baudrate, * rts=0|1 Set RTS off resp. on.\n * Please note that values and combinations of these parameters must be * supported by the concrete serial interface hardware and the drivers for it. + * * @retval SR_OK Success. * @retval SR_ERR Failure. + * + * @private */ SR_PRIV int serial_set_paramstr(struct sr_serial_dev_inst *serial, const char *paramstr) { +/** @cond PRIVATE */ #define SERIAL_COMM_SPEC "^(\\d+)/([5678])([neo])([12])(.*)$" +/** @endcond */ GRegex *reg; GMatchInfo *match; @@ -526,11 +600,13 @@ SR_PRIV int serial_set_paramstr(struct sr_serial_dev_inst *serial, * * @retval SR_OK Success. * @retval SR_ERR Failure. + * + * @private */ SR_PRIV int serial_readline(struct sr_serial_dev_inst *serial, char **buf, int *buflen, gint64 timeout_ms) { - gint64 start; + gint64 start, remaining; int maxlen, len; if (!serial) { @@ -543,8 +619,8 @@ SR_PRIV int serial_readline(struct sr_serial_dev_inst *serial, char **buf, return -1; } - timeout_ms *= 1000; start = g_get_monotonic_time(); + remaining = timeout_ms; maxlen = *buflen; *buflen = len = 0; @@ -552,7 +628,7 @@ SR_PRIV int serial_readline(struct sr_serial_dev_inst *serial, char **buf, len = maxlen - *buflen - 1; if (len < 1) break; - len = serial_read(serial, *buf + *buflen, 1); + len = sp_blocking_read(serial->data, *buf + *buflen, 1, remaining); if (len > 0) { *buflen += len; *(*buf + *buflen) = '\0'; @@ -563,7 +639,9 @@ SR_PRIV int serial_readline(struct sr_serial_dev_inst *serial, char **buf, break; } } - if (g_get_monotonic_time() - start > timeout_ms) + /* Reduce timeout by time elapsed. */ + remaining = timeout_ms - ((g_get_monotonic_time() - start) / 1000); + if (remaining <= 0) /* Timeout */ break; if (len < 1) @@ -591,6 +669,8 @@ SR_PRIV int serial_readline(struct sr_serial_dev_inst *serial, char **buf, * * @retval SR_OK Valid packet was found within the given timeout. * @retval SR_ERR Failure. + * + * @private */ SR_PRIV int serial_stream_detect(struct sr_serial_dev_inst *serial, uint8_t *buf, size_t *buflen, @@ -618,7 +698,7 @@ SR_PRIV int serial_stream_detect(struct sr_serial_dev_inst *serial, i = ibuf = len = 0; while (ibuf < maxlen) { - len = serial_read(serial, &buf[ibuf], 1); + len = serial_read_nonblocking(serial, &buf[ibuf], 1); if (len > 0) { ibuf += len; } else if (len == 0) { @@ -670,6 +750,8 @@ SR_PRIV int serial_stream_detect(struct sr_serial_dev_inst *serial, * * @return SR_OK if a serial_device is found, SR_ERR if no device is found. The * returned string should not be freed by the caller. + * + * @private */ SR_PRIV int sr_serial_extract_options(GSList *options, const char **serial_device, const char **serial_options) @@ -684,30 +766,32 @@ SR_PRIV int sr_serial_extract_options(GSList *options, const char **serial_devic switch (src->key) { case SR_CONF_CONN: *serial_device = g_variant_get_string(src->data, NULL); - sr_dbg("Parsed serial device: %s", *serial_device); + sr_dbg("Parsed serial device: %s.", *serial_device); break; - case SR_CONF_SERIALCOMM: *serial_options = g_variant_get_string(src->data, NULL); - sr_dbg("Parsed serial options: %s", *serial_options); + sr_dbg("Parsed serial options: %s.", *serial_options); break; } } if (!*serial_device) { - sr_dbg("No serial device specified"); + sr_dbg("No serial device specified."); return SR_ERR; } return SR_OK; } +/** @cond PRIVATE */ #ifdef _WIN32 typedef HANDLE event_handle; #else typedef int event_handle; #endif +/** @endcond */ +/** @private */ SR_PRIV int serial_source_add(struct sr_session *session, struct sr_serial_dev_inst *serial, int events, int timeout, sr_receive_data_callback cb, void *cb_data) @@ -753,6 +837,7 @@ SR_PRIV int serial_source_add(struct sr_session *session, return SR_OK; } +/** @private */ SR_PRIV int serial_source_remove(struct sr_session *session, struct sr_serial_dev_inst *serial) { @@ -772,140 +857,148 @@ SR_PRIV int serial_source_remove(struct sr_session *session, } /** - * Find USB serial devices via the USB vendor ID and product ID. + * Create/allocate a new sr_serial_port structure. * - * @param[in] vendor_id Vendor ID of the USB device. - * @param[in] product_id Product ID of the USB device. + * @param name The OS dependent name of the serial port. Must not be NULL. + * @param description An end user friendly description for the serial port. + * Can be NULL (in that case the empty string is used + * as description). * - * @return A GSList of strings containing the path of the serial device or + * @return The newly allocated sr_serial_port struct. + */ +static struct sr_serial_port *sr_serial_new(const char *name, + const char *description) +{ + struct sr_serial_port *serial; + + if (!name) + return NULL; + + serial = g_malloc(sizeof(struct sr_serial_port)); + serial->name = g_strdup(name); + serial->description = g_strdup(description ? description : ""); + + return serial; +} + +/** + * Free a previously allocated sr_serial_port structure. + * + * @param serial The sr_serial_port struct to free. Must not be NULL. + */ +SR_API void sr_serial_free(struct sr_serial_port *serial) +{ + if (!serial) + return; + g_free(serial->name); + g_free(serial->description); + g_free(serial); +} + +/** + * List available serial devices. + * + * @return A GSList of strings containing the path of the serial devices or * NULL if no serial device is found. The returned list must be freed * by the caller. */ -SR_PRIV GSList *sr_serial_find_usb(uint16_t vendor_id, uint16_t product_id) +SR_API GSList *sr_serial_list(const struct sr_dev_driver *driver) { -#ifdef __linux__ - const gchar *usb_dev; - const char device_tree[] = "/sys/bus/usb/devices/"; - GDir *devices_dir, *device_dir; - GSList *l = NULL; - GSList *tty_devs; - GSList *matched_paths; - FILE *fd; - char tmp[5]; - gchar *vendor_path, *product_path, *path_copy; - gchar *prefix, *subdir_path, *device_path, *tty_path; - unsigned long read_vendor_id, read_product_id; - const char *file; - - l = NULL; - tty_devs = NULL; - matched_paths = NULL; - - if (!(devices_dir = g_dir_open(device_tree, 0, NULL))) + GSList *tty_devs = NULL; + struct sp_port **ports; + struct sr_serial_port *port; + int i; + + /* Currently unused, but will be used by some drivers later on. */ + (void)driver; + + if (sp_list_ports(&ports) != SP_OK) return NULL; - /* - * Find potential candidates using the vendor ID and product ID - * and store them in matched_paths. - */ - while ((usb_dev = g_dir_read_name(devices_dir))) { - vendor_path = g_strconcat(device_tree, - usb_dev, "/idVendor", NULL); - product_path = g_strconcat(device_tree, - usb_dev, "/idProduct", NULL); - - if (!g_file_test(vendor_path, G_FILE_TEST_EXISTS) || - !g_file_test(product_path, G_FILE_TEST_EXISTS)) - goto skip_device; - - if ((fd = g_fopen(vendor_path, "r")) == NULL) - goto skip_device; - - if (fgets(tmp, sizeof(tmp), fd) == NULL) { - fclose(fd); - goto skip_device; - } - read_vendor_id = strtoul(tmp, NULL, 16); + for (i = 0; ports[i]; i++) { + port = sr_serial_new(sp_get_port_name(ports[i]), + sp_get_port_description(ports[i])); + tty_devs = g_slist_append(tty_devs, port); + } - fclose(fd); + sp_free_port_list(ports); - if ((fd = g_fopen(product_path, "r")) == NULL) - goto skip_device; + return tty_devs; +} - if (fgets(tmp, sizeof(tmp), fd) == NULL) { - fclose(fd); - goto skip_device; - } - read_product_id = strtoul(tmp, NULL, 16); +/** + * Find USB serial devices via the USB vendor ID and product ID. + * + * @param[in] vendor_id Vendor ID of the USB device. + * @param[in] product_id Product ID of the USB device. + * + * @return A GSList of strings containing the path of the serial device or + * NULL if no serial device is found. The returned list must be freed + * by the caller. + * + * @private + */ +SR_PRIV GSList *sr_serial_find_usb(uint16_t vendor_id, uint16_t product_id) +{ + GSList *tty_devs = NULL; + struct sp_port **ports; + int i, vid, pid; - fclose(fd); + if (sp_list_ports(&ports) != SP_OK) + return NULL; - if (vendor_id == read_vendor_id && - product_id == read_product_id) { - path_copy = g_strdup(usb_dev); - matched_paths = g_slist_prepend(matched_paths, - path_copy); + for (i = 0; ports[i]; i++) + if (sp_get_port_transport(ports[i]) == SP_TRANSPORT_USB && + sp_get_port_usb_vid_pid(ports[i], &vid, &pid) == SP_OK && + vid == vendor_id && pid == product_id) { + tty_devs = g_slist_prepend(tty_devs, + g_strdup(sp_get_port_name(ports[i]))); } -skip_device: - g_free(vendor_path); - g_free(product_path); - } - g_dir_close(devices_dir); + sp_free_port_list(ports); - /* For every matched device try to find a ttyUSBX subfolder. */ - for (l = matched_paths; l; l = l->next) { - subdir_path = NULL; + return tty_devs; +} - device_path = g_strconcat(device_tree, l->data, NULL); +/** @private */ +SR_PRIV int serial_timeout(struct sr_serial_dev_inst *port, int num_bytes) +{ + struct sp_port_config *config; + int timeout_ms, bits, baud, tmp; - if (!(device_dir = g_dir_open(device_path, 0, NULL))) { - g_free(device_path); - continue; - } + /* Default to 1s. */ + timeout_ms = 1000; - prefix = g_strconcat(l->data, ":", NULL); + if (sp_new_config(&config) < 0) + return timeout_ms; - while ((file = g_dir_read_name(device_dir))) { - if (g_str_has_prefix(file, prefix)) { - subdir_path = g_strconcat(device_path, - "/", file, NULL); - break; - } - } - g_dir_close(device_dir); + bits = baud = 0; + do { + if (sp_get_config(port->data, config) < 0) + break; - g_free(prefix); - g_free(device_path); + /* Start bit. */ + bits = 1; + if (sp_get_config_bits(config, &tmp) < 0) + break; + bits += tmp; + if (sp_get_config_stopbits(config, &tmp) < 0) + break; + bits += tmp; + if (sp_get_config_baudrate(config, &tmp) < 0) + break; + baud = tmp; + } while (FALSE); - if (subdir_path) { - if (!(device_dir = g_dir_open(subdir_path, 0, NULL))) { - g_free(subdir_path); - continue; - } - g_free(subdir_path); - - while ((file = g_dir_read_name(device_dir))) { - if (g_str_has_prefix(file, "ttyUSB")) { - tty_path = g_strconcat("/dev/", - file, NULL); - sr_dbg("Found USB device %04x:%04x attached to %s.", - vendor_id, product_id, tty_path); - tty_devs = g_slist_prepend(tty_devs, - tty_path); - break; - } - } - g_dir_close(device_dir); - } + if (bits && baud) { + /* Throw in 10ms for misc OS overhead. */ + timeout_ms = 10; + timeout_ms += ((1000.0 / baud) * bits) * num_bytes; } - g_slist_free_full(matched_paths, g_free); - return tty_devs; -#else - (void)vendor_id; - (void)product_id; + sp_free_config(config); - return NULL; -#endif + return timeout_ms; } + +/** @} */