876 lines
21 KiB
C
876 lines
21 KiB
C
/*
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* This file is part of the sigrok project.
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*
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* Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
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* Copyright (C) 2010-2012 Uwe Hermann <uwe@hermann-uwe.de>
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* Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#ifdef _WIN32
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#include <windows.h>
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#else
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#include <glob.h>
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#include <termios.h>
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#include <sys/ioctl.h>
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#endif
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#include <stdlib.h>
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#include <errno.h>
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#include <glib.h>
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#include "libsigrok.h"
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#include "libsigrok-internal.h"
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/* Message logging helpers with driver-specific prefix string. */
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#define DRIVER_LOG_DOMAIN "serial: "
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#define sr_log(l, s, args...) sr_log(l, DRIVER_LOG_DOMAIN s, ## args)
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#define sr_spew(s, args...) sr_spew(DRIVER_LOG_DOMAIN s, ## args)
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#define sr_dbg(s, args...) sr_dbg(DRIVER_LOG_DOMAIN s, ## args)
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#define sr_info(s, args...) sr_info(DRIVER_LOG_DOMAIN s, ## args)
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#define sr_warn(s, args...) sr_warn(DRIVER_LOG_DOMAIN s, ## args)
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#define sr_err(s, args...) sr_err(DRIVER_LOG_DOMAIN s, ## args)
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// FIXME: Must be moved, or rather passed as function argument.
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#ifdef _WIN32
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static HANDLE hdl;
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#endif
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/**
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* Open the specified serial port.
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*
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* @param serial Previously initialized serial port structure.
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* @param flags Flags to use when opening the serial port. Possible flags
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* include SERIAL_RDWR, SERIAL_RDONLY, SERIAL_NONBLOCK.
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*
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* If the serial structure contains a serialcomm string, it will be
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* passed to serial_set_paramstr() after the port is opened.
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*
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* @return SR_OK on success, SR_ERR on failure.
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*/
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SR_PRIV int serial_open(struct sr_serial_dev_inst *serial, int flags)
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{
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int flags_local = 0;
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#ifdef _WIN32
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DWORD desired_access = 0, flags_and_attributes = 0;
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#endif
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if (!serial) {
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sr_dbg("Invalid serial port.");
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return SR_ERR;
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}
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sr_spew("Opening serial port '%s' (flags %d).", serial->port, flags);
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#ifdef _WIN32
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/* Map 'flags' to the OS-specific settings. */
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desired_access |= GENERIC_READ;
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flags_and_attributes = FILE_ATTRIBUTE_NORMAL;
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if (flags & SERIAL_RDWR)
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desired_access |= GENERIC_WRITE;
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if (flags & SERIAL_NONBLOCK)
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flags_and_attributes |= FILE_FLAG_OVERLAPPED;
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hdl = CreateFile(serial->port, desired_access, 0, 0,
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OPEN_EXISTING, flags_and_attributes, 0);
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if (hdl == INVALID_HANDLE_VALUE) {
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sr_err("Error opening serial port '%s'.", serial->port);
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return SR_ERR;
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}
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#else
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/* Map 'flags' to the OS-specific settings. */
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if (flags & SERIAL_RDWR)
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flags_local |= O_RDWR;
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if (flags & SERIAL_RDONLY)
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flags_local |= O_RDONLY;
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if (flags & SERIAL_NONBLOCK)
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flags_local |= O_NONBLOCK;
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if ((serial->fd = open(serial->port, flags_local)) < 0) {
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sr_err("Error opening serial port '%s': %s.", serial->port,
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strerror(errno));
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return SR_ERR;
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}
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sr_spew("Opened serial port '%s' (fd %d).", serial->port, serial->fd);
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#endif
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if (serial->serialcomm)
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return serial_set_paramstr(serial, serial->serialcomm);
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else
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return SR_OK;
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}
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/**
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* Close the specified serial port.
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*
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* @param serial Previously initialized serial port structure.
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*
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* @return SR_OK on success, SR_ERR on failure.
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*/
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SR_PRIV int serial_close(struct sr_serial_dev_inst *serial)
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{
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int ret;
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if (!serial) {
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sr_dbg("Invalid serial port.");
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return SR_ERR;
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}
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if (serial->fd == -1) {
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sr_dbg("Cannot close unopened serial port %s (fd %d).",
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serial->port, serial->fd);
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return SR_ERR;
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}
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sr_spew("Closing serial port %s (fd %d).", serial->port, serial->fd);
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ret = SR_OK;
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#ifdef _WIN32
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/* Returns non-zero upon success, 0 upon failure. */
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if (CloseHandle(hdl) == 0)
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ret = SR_ERR;
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#else
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/* Returns 0 upon success, -1 upon failure. */
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if (close(serial->fd) < 0) {
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sr_err("Error closing serial port: %s (fd %d).", strerror(errno),
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serial->fd);
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ret = SR_ERR;
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}
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#endif
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serial->fd = -1;
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return ret;
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}
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/**
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* Flush serial port buffers.
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*
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* @param serial Previously initialized serial port structure.
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*
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* @return SR_OK on success, SR_ERR on failure.
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*/
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SR_PRIV int serial_flush(struct sr_serial_dev_inst *serial)
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{
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int ret;
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if (!serial) {
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sr_dbg("Invalid serial port.");
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return SR_ERR;
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}
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if (serial->fd == -1) {
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sr_dbg("Cannot flush unopened serial port %s (fd %d).",
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serial->port, serial->fd);
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return SR_ERR;
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}
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sr_spew("Flushing serial port %s (fd %d).", serial->port, serial->fd);
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ret = SR_OK;
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#ifdef _WIN32
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/* Returns non-zero upon success, 0 upon failure. */
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if (PurgeComm(hdl, PURGE_RXCLEAR | PURGE_TXCLEAR) == 0) {
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sr_err("Error flushing serial port: %s.", strerror(errno));
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ret = SR_ERR;
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}
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#else
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/* Returns 0 upon success, -1 upon failure. */
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if (tcflush(serial->fd, TCIOFLUSH) < 0) {
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sr_err("Error flushing serial port: %s.", strerror(errno));
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ret = SR_ERR;
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}
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return ret;
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#endif
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}
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/**
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* Write a number of bytes to the specified serial port.
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*
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* @param serial Previously initialized serial port structure.
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* @param buf Buffer containing the bytes to write.
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* @param count Number of bytes to write.
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*
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* @return The number of bytes written, or -1 upon failure.
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*/
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SR_PRIV int serial_write(struct sr_serial_dev_inst *serial,
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const void *buf, size_t count)
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{
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ssize_t ret;
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if (!serial) {
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sr_dbg("Invalid serial port.");
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return -1;
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}
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if (serial->fd == -1) {
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sr_dbg("Cannot use unopened serial port %s (fd %d).",
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serial->port, serial->fd);
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return -1;
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}
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#ifdef _WIN32
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DWORD tmp = 0;
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/* FIXME */
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/* Returns non-zero upon success, 0 upon failure. */
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WriteFile(hdl, buf, count, &tmp, NULL);
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#else
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/* Returns the number of bytes written, or -1 upon failure. */
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ret = write(serial->fd, buf, count);
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if (ret < 0)
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sr_err("Write error: %s.", strerror(errno));
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else
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sr_spew("Wrote %d/%d bytes (fd %d).", ret, count, serial->fd);
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#endif
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return ret;
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}
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/**
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* Read a number of bytes from the specified serial port.
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*
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* @param serial Previously initialized serial port structure.
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* @param buf Buffer where to store the bytes that are read.
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* @param count The number of bytes to read.
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*
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* @return The number of bytes read, or -1 upon failure.
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*/
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SR_PRIV int serial_read(struct sr_serial_dev_inst *serial, void *buf,
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size_t count)
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{
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ssize_t ret;
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if (!serial) {
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sr_dbg("Invalid serial port.");
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return -1;
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}
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if (serial->fd == -1) {
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sr_dbg("Cannot use unopened serial port %s (fd %d).",
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serial->port, serial->fd);
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return -1;
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}
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#ifdef _WIN32
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DWORD tmp = 0;
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/* FIXME */
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/* Returns non-zero upon success, 0 upon failure. */
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return ReadFile(hdl, buf, count, &tmp, NULL);
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#else
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/* Returns the number of bytes read, or -1 upon failure. */
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ret = read(serial->fd, buf, count);
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#endif
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return ret;
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}
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/**
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* Set serial parameters for the specified serial port.
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*
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* @param serial Previously initialized serial port structure.
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* @param baudrate The baudrate to set.
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* @param bits The number of data bits to use.
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* @param parity The parity setting to use (0 = none, 1 = even, 2 = odd).
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* @param stopbits The number of stop bits to use (1 or 2).
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* @param flowcontrol The flow control settings to use (0 = none, 1 = RTS/CTS,
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* 2 = XON/XOFF).
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*
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* @return SR_OK upon success, SR_ERR upon failure.
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*/
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SR_PRIV int serial_set_params(struct sr_serial_dev_inst *serial, int baudrate,
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int bits, int parity, int stopbits,
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int flowcontrol, int rts, int dtr)
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{
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if (!serial) {
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sr_dbg("Invalid serial port.");
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return SR_ERR;
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}
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if (serial->fd == -1) {
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sr_dbg("Cannot configure unopened serial port %s (fd %d).",
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serial->port, serial->fd);
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return SR_ERR;
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}
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sr_spew("Setting serial parameters on port %s (fd %d).", serial->port,
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serial->fd);
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#ifdef _WIN32
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DCB dcb;
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if (!GetCommState(hdl, &dcb)) {
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sr_err("Failed to get comm state on port %s (fd %d): %d.",
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serial->port, serial->fd, GetLastError());
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return SR_ERR;
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}
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switch (baudrate) {
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/*
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* The baudrates 50/75/134/150/200/1800/230400/460800 do not seem to
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* have documented CBR_* macros.
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*/
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case 110:
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dcb.BaudRate = CBR_110;
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break;
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case 300:
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dcb.BaudRate = CBR_300;
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break;
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case 600:
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dcb.BaudRate = CBR_600;
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break;
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case 1200:
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dcb.BaudRate = CBR_1200;
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break;
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case 2400:
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dcb.BaudRate = CBR_2400;
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break;
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case 4800:
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dcb.BaudRate = CBR_4800;
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break;
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case 9600:
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dcb.BaudRate = CBR_9600;
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break;
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case 14400:
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dcb.BaudRate = CBR_14400; /* Not available on Unix? */
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break;
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case 19200:
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dcb.BaudRate = CBR_19200;
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break;
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case 38400:
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dcb.BaudRate = CBR_38400;
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break;
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case 57600:
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dcb.BaudRate = CBR_57600;
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break;
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case 115200:
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dcb.BaudRate = CBR_115200;
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break;
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case 128000:
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dcb.BaudRate = CBR_128000; /* Not available on Unix? */
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break;
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case 256000:
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dcb.BaudRate = CBR_256000; /* Not available on Unix? */
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break;
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default:
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sr_err("Unsupported baudrate: %d.", baudrate);
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return SR_ERR;
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}
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sr_spew("Configuring baudrate to %d (%d).", baudrate, dcb.BaudRate);
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sr_spew("Configuring %d data bits.", bits);
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dcb.ByteSize = bits;
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sr_spew("Configuring %d stop bits.", stopbits);
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switch (stopbits) {
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/* Note: There's also ONE5STOPBITS == 1.5 (unneeded so far). */
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case 1:
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dcb.StopBits = ONESTOPBIT;
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break;
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case 2:
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dcb.StopBits = TWOSTOPBITS;
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break;
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default:
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sr_err("Unsupported stopbits number: %d.", stopbits);
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return SR_ERR;
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}
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switch (parity) {
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/* Note: There's also SPACEPARITY, MARKPARITY (unneeded so far). */
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case SERIAL_PARITY_NONE:
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sr_spew("Configuring no parity.");
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dcb.Parity = NOPARITY;
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break;
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case SERIAL_PARITY_EVEN:
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sr_spew("Configuring even parity.");
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dcb.Parity = EVENPARITY;
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break;
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case SERIAL_PARITY_ODD:
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sr_spew("Configuring odd parity.");
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dcb.Parity = ODDPARITY;
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break;
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default:
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sr_err("Unsupported parity setting: %d.", parity);
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return SR_ERR;
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}
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if (rts != -1) {
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sr_spew("Setting RTS %s.", rts ? "high" : "low");
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if (rts)
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dcb.fRtsControl = RTS_CONTROL_ENABLE;
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else
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dcb.fRtsControl = RTS_CONTROL_DISABLE;
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}
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if (dtr != -1) {
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sr_spew("Setting DTR %s.", dtr ? "high" : "low");
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if (rts)
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dcb.fDtrControl = DTR_CONTROL_ENABLE;
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else
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dcb.fDtrControl = DTR_CONTROL_DISABLE;
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}
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if (!SetCommState(hdl, &dcb)) {
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sr_err("Failed to set comm state on port %s (fd %d): %d.",
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serial->port, serial->fd, GetLastError());
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return SR_ERR;
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}
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#else
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struct termios term;
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speed_t baud;
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int ret, controlbits;
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if (tcgetattr(serial->fd, &term) < 0) {
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sr_err("tcgetattr() error on port %s (fd %d): %s.",
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serial->port, serial->fd, strerror(errno));
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return SR_ERR;
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}
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switch (baudrate) {
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case 50:
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baud = B50;
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break;
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case 75:
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baud = B75;
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break;
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case 110:
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baud = B110;
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break;
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case 134:
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baud = B134;
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break;
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case 150:
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baud = B150;
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break;
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case 200:
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baud = B200;
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break;
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case 300:
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baud = B300;
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break;
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case 600:
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baud = B600;
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break;
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case 1200:
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baud = B1200;
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break;
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case 1800:
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baud = B1800;
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break;
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case 2400:
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baud = B2400;
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break;
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case 4800:
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baud = B4800;
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break;
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case 9600:
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baud = B9600;
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break;
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case 19200:
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baud = B19200;
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break;
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case 38400:
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baud = B38400;
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break;
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case 57600:
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baud = B57600;
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break;
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case 115200:
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baud = B115200;
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break;
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case 230400:
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baud = B230400;
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break;
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#ifndef __APPLE__
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case 460800:
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baud = B460800;
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break;
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#endif
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default:
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sr_err("Unsupported baudrate: %d.", baudrate);
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return SR_ERR;
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}
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sr_spew("Configuring output baudrate to %d (%d).", baudrate, baud);
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if (cfsetospeed(&term, baud) < 0) {
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sr_err("cfsetospeed() error: %s.", strerror(errno));
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return SR_ERR;
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}
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sr_spew("Configuring input baudrate to %d (%d).", baudrate, baud);
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if (cfsetispeed(&term, baud) < 0) {
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sr_err("cfsetispeed() error: %s.", strerror(errno));
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return SR_ERR;
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}
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sr_spew("Configuring %d data bits.", bits);
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term.c_cflag &= ~CSIZE;
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switch (bits) {
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case 8:
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term.c_cflag |= CS8;
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break;
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case 7:
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term.c_cflag |= CS7;
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break;
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default:
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sr_err("Unsupported data bits number %d.", bits);
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return SR_ERR;
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}
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sr_spew("Configuring %d stop bits.", stopbits);
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term.c_cflag &= ~CSTOPB;
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switch (stopbits) {
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case 1:
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term.c_cflag &= ~CSTOPB;
|
|
break;
|
|
case 2:
|
|
term.c_cflag |= CSTOPB;
|
|
break;
|
|
default:
|
|
sr_err("Unsupported stopbits number %d.", stopbits);
|
|
return SR_ERR;
|
|
}
|
|
|
|
term.c_iflag &= ~(IXON | IXOFF);
|
|
term.c_cflag &= ~CRTSCTS;
|
|
switch (flowcontrol) {
|
|
case 0:
|
|
/* No flow control. */
|
|
sr_spew("Configuring no flow control.");
|
|
break;
|
|
case 1:
|
|
sr_spew("Configuring RTS/CTS flow control.");
|
|
term.c_cflag |= CRTSCTS;
|
|
break;
|
|
case 2:
|
|
sr_spew("Configuring XON/XOFF flow control.");
|
|
term.c_iflag |= IXON | IXOFF;
|
|
break;
|
|
default:
|
|
sr_err("Unsupported flow control setting %d.", flowcontrol);
|
|
return SR_ERR;
|
|
}
|
|
|
|
term.c_iflag &= ~IGNPAR;
|
|
term.c_cflag &= ~(PARODD | PARENB);
|
|
switch (parity) {
|
|
case SERIAL_PARITY_NONE:
|
|
sr_spew("Configuring no parity.");
|
|
term.c_iflag |= IGNPAR;
|
|
break;
|
|
case SERIAL_PARITY_EVEN:
|
|
sr_spew("Configuring even parity.");
|
|
term.c_cflag |= PARENB;
|
|
break;
|
|
case SERIAL_PARITY_ODD:
|
|
sr_spew("Configuring odd parity.");
|
|
term.c_cflag |= PARENB | PARODD;
|
|
break;
|
|
default:
|
|
sr_err("Unsupported parity setting %d.", parity);
|
|
return SR_ERR;
|
|
}
|
|
|
|
/* Do not translate carriage return to newline on input. */
|
|
term.c_iflag &= ~(ICRNL);
|
|
|
|
/* Disable canonical mode, and don't echo input characters. */
|
|
term.c_lflag &= ~(ICANON | ECHO);
|
|
|
|
/* Write the configured settings. */
|
|
if (tcsetattr(serial->fd, TCSADRAIN, &term) < 0) {
|
|
sr_err("tcsetattr() error: %s.", strerror(errno));
|
|
return SR_ERR;
|
|
}
|
|
|
|
if (rts != -1) {
|
|
sr_spew("Setting RTS %s.", rts ? "high" : "low");
|
|
controlbits = TIOCM_RTS;
|
|
if ((ret = ioctl(serial->fd, rts ? TIOCMBIS : TIOCMBIC,
|
|
&controlbits)) < 0) {
|
|
sr_err("Error setting RTS: %s.", strerror(errno));
|
|
return SR_ERR;
|
|
}
|
|
}
|
|
|
|
if (dtr != -1) {
|
|
sr_spew("Setting DTR %s.", dtr ? "high" : "low");
|
|
controlbits = TIOCM_DTR;
|
|
if ((ret = ioctl(serial->fd, dtr ? TIOCMBIS : TIOCMBIC,
|
|
&controlbits)) < 0) {
|
|
sr_err("Error setting DTR: %s.", strerror(errno));
|
|
return SR_ERR;
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|
|
return SR_OK;
|
|
}
|
|
|
|
/**
|
|
* Set serial parameters for the specified serial port.
|
|
*
|
|
* @param serial Previously initialized serial port structure.
|
|
* @param paramstr A serial communication parameters string, in the form
|
|
* of <speed>/<data bits><parity><stopbits><flow>, for example "9600/8n1" or
|
|
* "600/7o2" or "460800/8n1/flow=2" where flow is 0 for none, 1 for rts/cts and 2 for xon/xoff.
|
|
*
|
|
* @return SR_OK upon success, SR_ERR upon failure.
|
|
*/
|
|
#define SERIAL_COMM_SPEC "^(\\d+)/([78])([neo])([12])(.*)$"
|
|
SR_PRIV int serial_set_paramstr(struct sr_serial_dev_inst *serial,
|
|
const char *paramstr)
|
|
{
|
|
GRegex *reg;
|
|
GMatchInfo *match;
|
|
int speed, databits, parity, stopbits, flow, rts, dtr, i;
|
|
char *mstr, **opts, **kv;
|
|
|
|
speed = databits = parity = stopbits = flow = 0;
|
|
rts = dtr = -1;
|
|
sr_spew("Parsing parameters from \"%s\".", paramstr);
|
|
reg = g_regex_new(SERIAL_COMM_SPEC, 0, 0, NULL);
|
|
if (g_regex_match(reg, paramstr, 0, &match)) {
|
|
if ((mstr = g_match_info_fetch(match, 1)))
|
|
speed = strtoul(mstr, NULL, 10);
|
|
g_free(mstr);
|
|
if ((mstr = g_match_info_fetch(match, 2)))
|
|
databits = strtoul(mstr, NULL, 10);
|
|
g_free(mstr);
|
|
if ((mstr = g_match_info_fetch(match, 3))) {
|
|
switch (mstr[0]) {
|
|
case 'n':
|
|
parity = SERIAL_PARITY_NONE;
|
|
break;
|
|
case 'e':
|
|
parity = SERIAL_PARITY_EVEN;
|
|
break;
|
|
case 'o':
|
|
parity = SERIAL_PARITY_ODD;
|
|
break;
|
|
}
|
|
}
|
|
g_free(mstr);
|
|
if ((mstr = g_match_info_fetch(match, 4)))
|
|
stopbits = strtoul(mstr, NULL, 10);
|
|
g_free(mstr);
|
|
if ((mstr = g_match_info_fetch(match, 5)) && mstr[0] != '\0') {
|
|
if (mstr[0] != '/') {
|
|
sr_dbg("missing separator before extra options");
|
|
speed = 0;
|
|
} else {
|
|
/* A set of "key=value" options separated by / */
|
|
opts = g_strsplit(mstr + 1, "/", 0);
|
|
for (i = 0; opts[i]; i++) {
|
|
kv = g_strsplit(opts[i], "=", 2);
|
|
if (!strncmp(kv[0], "rts", 3)) {
|
|
if (kv[1][0] == '1')
|
|
rts = 1;
|
|
else if (kv[1][0] == '0')
|
|
rts = 0;
|
|
else {
|
|
sr_dbg("invalid value for rts: %c", kv[1][0]);
|
|
speed = 0;
|
|
}
|
|
} else if (!strncmp(kv[0], "dtr", 3)) {
|
|
if (kv[1][0] == '1')
|
|
dtr = 1;
|
|
else if (kv[1][0] == '0')
|
|
dtr = 0;
|
|
else {
|
|
sr_dbg("invalid value for dtr: %c", kv[1][0]);
|
|
speed = 0;
|
|
}
|
|
} else if (!strncmp(kv[0], "flow", 4)) {
|
|
if (kv[1][0] == '0')
|
|
flow = 0;
|
|
else if (kv[1][0] == '1')
|
|
flow = 1;
|
|
else if (kv[1][0] == '2')
|
|
flow = 2;
|
|
else {
|
|
sr_dbg("invalid value for flow: %c", kv[1][0]);
|
|
speed = 0;
|
|
}
|
|
}
|
|
g_strfreev(kv);
|
|
}
|
|
g_strfreev(opts);
|
|
}
|
|
}
|
|
g_free(mstr);
|
|
}
|
|
g_match_info_unref(match);
|
|
g_regex_unref(reg);
|
|
|
|
if (speed) {
|
|
return serial_set_params(serial, speed, databits, parity,
|
|
stopbits, flow, rts, dtr);
|
|
} else {
|
|
sr_dbg("Could not infer speed from parameter string.");
|
|
return SR_ERR_ARG;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Read a line from the specified serial port.
|
|
*
|
|
* @param serial Previously initialized serial port structure.
|
|
* @param buf Buffer where to store the bytes that are read.
|
|
* @param buflen Size of the buffer.
|
|
* @param timeout_ms How long to wait for a line to come in.
|
|
*
|
|
* Reading stops when CR of LR is found, which is stripped from the buffer.
|
|
*
|
|
* @return SR_OK on success, SR_ERR on failure.
|
|
*/
|
|
SR_PRIV int serial_readline(struct sr_serial_dev_inst *serial, char **buf,
|
|
int *buflen, gint64 timeout_ms)
|
|
{
|
|
gint64 start;
|
|
int maxlen, len;
|
|
|
|
if (!serial || serial->fd == -1) {
|
|
sr_dbg("Invalid serial port.");
|
|
return SR_ERR;
|
|
}
|
|
|
|
if (serial->fd == -1) {
|
|
sr_dbg("Cannot use unopened serial port %s (fd %d).",
|
|
serial->port, serial->fd);
|
|
return -1;
|
|
}
|
|
|
|
timeout_ms *= 1000;
|
|
start = g_get_monotonic_time();
|
|
|
|
maxlen = *buflen;
|
|
*buflen = len = 0;
|
|
while(1) {
|
|
len = maxlen - *buflen - 1;
|
|
if (len < 1)
|
|
break;
|
|
len = serial_read(serial, *buf + *buflen, 1);
|
|
if (len > 0) {
|
|
*buflen += len;
|
|
*(*buf + *buflen) = '\0';
|
|
if (*buflen > 0 && (*(*buf + *buflen - 1) == '\r'
|
|
|| *(*buf + *buflen - 1) == '\n')) {
|
|
/* Strip CR/LF and terminate. */
|
|
*(*buf + --*buflen) = '\0';
|
|
break;
|
|
}
|
|
}
|
|
if (g_get_monotonic_time() - start > timeout_ms)
|
|
/* Timeout */
|
|
break;
|
|
g_usleep(2000);
|
|
}
|
|
if (*buflen)
|
|
sr_dbg("Received %d: '%s'.", *buflen, *buf);
|
|
|
|
return SR_OK;
|
|
}
|
|
|
|
/**
|
|
* Try to find a valid packet in a serial data stream.
|
|
*
|
|
* @param serial Previously initialized serial port structure.
|
|
* @param buf Buffer containing the bytes to write.
|
|
* @param count Size of the buffer.
|
|
* @param packet_size Size, in bytes, of a valid packet.
|
|
* @param is_valid Callback that assesses whether the packet is valid or not.
|
|
* @param timeout_ms The timeout after which, if no packet is detected, to
|
|
* abort scanning.
|
|
* @param baudrate The baudrate of the serial port. This parameter is not
|
|
* critical, but it helps fine tune the serial port polling
|
|
* delay.
|
|
*
|
|
* @return SR_OK if a valid packet is found within the given timeout,
|
|
* SR_ERR upon failure.
|
|
*/
|
|
SR_PRIV int serial_stream_detect(struct sr_serial_dev_inst *serial,
|
|
uint8_t *buf, size_t *buflen,
|
|
size_t packet_size, packet_valid_t is_valid,
|
|
uint64_t timeout_ms, int baudrate)
|
|
{
|
|
uint64_t start, time, byte_delay_us;
|
|
size_t ibuf, i, maxlen;
|
|
int len;
|
|
|
|
maxlen = *buflen;
|
|
|
|
sr_dbg("Detecting packets on FD %d (timeout = %" PRIu64
|
|
"ms, baudrate = %d).", serial->fd, timeout_ms, baudrate);
|
|
|
|
if (maxlen < (packet_size / 2) ) {
|
|
sr_err("Buffer size must be at least twice the packet size.");
|
|
return SR_ERR;
|
|
}
|
|
|
|
/* Assume 8n1 transmission. That is 10 bits for every byte. */
|
|
byte_delay_us = 10 * (1000000 / baudrate);
|
|
start = g_get_monotonic_time();
|
|
|
|
i = ibuf = len = 0;
|
|
while (ibuf < maxlen) {
|
|
len = serial_read(serial, &buf[ibuf], 1);
|
|
if (len > 0) {
|
|
ibuf += len;
|
|
} else if (len == 0) {
|
|
/* No logging, already done in serial_read(). */
|
|
} else {
|
|
/* Error reading byte, but continuing anyway. */
|
|
}
|
|
|
|
time = g_get_monotonic_time() - start;
|
|
time /= 1000;
|
|
|
|
if ((ibuf - i) >= packet_size) {
|
|
/* We have at least a packet's worth of data. */
|
|
if (is_valid(&buf[i])) {
|
|
sr_spew("Found valid %d-byte packet after "
|
|
"%" PRIu64 "ms.", (ibuf - i), time);
|
|
*buflen = ibuf;
|
|
return SR_OK;
|
|
} else {
|
|
sr_spew("Got %d bytes, but not a valid "
|
|
"packet.", (ibuf - i));
|
|
}
|
|
/* Not a valid packet. Continue searching. */
|
|
i++;
|
|
}
|
|
if (time >= timeout_ms) {
|
|
/* Timeout */
|
|
sr_dbg("Detection timed out after %dms.", time);
|
|
break;
|
|
}
|
|
g_usleep(byte_delay_us);
|
|
}
|
|
|
|
*buflen = ibuf;
|
|
|
|
sr_err("Didn't find a valid packet (read %d bytes).", *buflen);
|
|
|
|
return SR_ERR;
|
|
}
|