659 lines
17 KiB
C
659 lines
17 KiB
C
/*
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* This file is part of the libsigrok 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 <stdlib.h>
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#include <glib.h>
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#include <libserialport.h>
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#include "libsigrok.h"
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#include "libsigrok-internal.h"
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/* Message logging helpers with subsystem-specific prefix string. */
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#define LOG_PREFIX "serial: "
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#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
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#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
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#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
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#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
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#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
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#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
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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 ret;
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char *error;
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int sp_flags = 0;
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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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sp_get_port_by_name(serial->port, &serial->data);
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if (flags & SERIAL_RDWR)
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sp_flags = (SP_MODE_READ | SP_MODE_WRITE);
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else if (flags & SERIAL_RDONLY)
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sp_flags = SP_MODE_READ;
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serial->nonblocking = (flags & SERIAL_NONBLOCK) ? 1 : 0;
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ret = sp_open(serial->data, sp_flags);
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switch (ret) {
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case SP_ERR_ARG:
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sr_err("Attempt to open serial port with invalid parameters.");
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return SR_ERR_ARG;
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case SP_ERR_FAIL:
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error = sp_last_error_message();
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sr_err("Error opening port: %s.", error);
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sp_free_error_message(error);
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return SR_ERR;
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}
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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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char *error;
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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->data) {
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sr_dbg("Cannot close unopened serial port %s.", serial->port);
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return SR_ERR;
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}
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sr_spew("Closing serial port %s.", serial->port);
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ret = sp_close(serial->data);
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switch (ret) {
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case SP_ERR_ARG:
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sr_err("Attempt to close an invalid serial port.");
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return SR_ERR_ARG;
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case SP_ERR_FAIL:
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error = sp_last_error_message();
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sr_err("Error closing port: %s.", error);
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sp_free_error_message(error);
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return SR_ERR;
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}
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sp_free_port(serial->data);
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serial->data = NULL;
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return SR_OK;
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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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char *error;
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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->data) {
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sr_dbg("Cannot flush unopened serial port %s.", serial->port);
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return SR_ERR;
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}
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sr_spew("Flushing serial port %s.", serial->port);
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ret = sp_flush(serial->data, SP_BUF_BOTH);
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switch (ret) {
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case SP_ERR_ARG:
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sr_err("Attempt to flush an invalid serial port.");
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return SR_ERR_ARG;
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case SP_ERR_FAIL:
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error = sp_last_error_message();
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sr_err("Error flushing port: %s.", error);
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sp_free_error_message(error);
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return SR_ERR;
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}
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return SR_OK;
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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 a negative error code 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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char *error;
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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->data) {
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sr_dbg("Cannot use unopened serial port %s.", serial->port);
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return SR_ERR;
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}
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if (serial->nonblocking)
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ret = sp_nonblocking_write(serial->data, buf, count);
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else
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ret = sp_blocking_write(serial->data, buf, count, 0);
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switch (ret) {
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case SP_ERR_ARG:
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sr_err("Attempted serial port write with invalid arguments.");
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return SR_ERR_ARG;
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case SP_ERR_FAIL:
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error = sp_last_error_message();
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sr_err("Write error: %s.", error);
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sp_free_error_message(error);
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return SR_ERR;
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}
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sr_spew("Wrote %d/%d bytes.", ret, count);
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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 a negative error code 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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char *error;
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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->data) {
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sr_dbg("Cannot use unopened serial port %s.", serial->port);
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return SR_ERR;
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}
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if (serial->nonblocking)
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ret = sp_nonblocking_read(serial->data, buf, count);
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else
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ret = sp_blocking_read(serial->data, buf, count, 0);
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switch (ret) {
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case SP_ERR_ARG:
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sr_err("Attempted serial port read with invalid arguments.");
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return SR_ERR_ARG;
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case SP_ERR_FAIL:
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error = sp_last_error_message();
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sr_err("Read error: %s.", error);
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sp_free_error_message(error);
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return SR_ERR;
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}
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if (ret > 0)
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sr_spew("Read %d/%d bytes.", ret, count);
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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[in] baudrate The baudrate to set.
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* @param[in] bits The number of data bits to use (5, 6, 7 or 8).
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* @param[in] parity The parity setting to use (0 = none, 1 = even, 2 = odd).
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* @param[in] stopbits The number of stop bits to use (1 or 2).
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* @param[in] flowcontrol The flow control settings to use (0 = none,
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* 1 = RTS/CTS, 2 = XON/XOFF).
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* @param[in] rts Status of RTS line (0 or 1; required by some interfaces).
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* @param[in] dtr Status of DTR line (0 or 1; required by some interfaces).
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*
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* @retval SR_OK Success
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* @retval SR_ERR 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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int ret;
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char *error;
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struct sp_port_config *config;
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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->data) {
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sr_dbg("Cannot configure unopened serial port %s.", serial->port);
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return SR_ERR;
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}
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sr_spew("Setting serial parameters on port %s.", serial->port);
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sp_new_config(&config);
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sp_set_config_baudrate(config, baudrate);
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sp_set_config_bits(config, bits);
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switch (parity) {
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case 0:
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sp_set_config_parity(config, SP_PARITY_NONE);
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break;
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case 1:
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sp_set_config_parity(config, SP_PARITY_EVEN);
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break;
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case 2:
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sp_set_config_parity(config, SP_PARITY_ODD);
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break;
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default:
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return SR_ERR_ARG;
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}
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sp_set_config_stopbits(config, stopbits);
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sp_set_config_rts(config, flowcontrol == 1 ? SP_RTS_FLOW_CONTROL : rts);
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sp_set_config_cts(config, flowcontrol == 1 ? SP_CTS_FLOW_CONTROL : SP_CTS_IGNORE);
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sp_set_config_dtr(config, dtr);
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sp_set_config_dsr(config, SP_DSR_IGNORE);
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sp_set_config_xon_xoff(config, flowcontrol == 2 ? SP_XONXOFF_INOUT : SP_XONXOFF_DISABLED);
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ret = sp_set_config(serial->data, config);
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sp_free_config(config);
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switch (ret) {
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case SP_ERR_ARG:
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sr_err("Invalid arguments for setting serial port parameters.");
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return SR_ERR_ARG;
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case SP_ERR_FAIL:
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error = sp_last_error_message();
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sr_err("Error setting serial port parameters: %s.", error);
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sp_free_error_message(error);
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return SR_ERR;
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}
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return SR_OK;
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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[in] paramstr A serial communication parameters string, in the form
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* of \<speed\>/\<data bits\>\<parity\>\<stopbits\>\<flow\>, for example
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* "9600/8n1" or "600/7o2" or "460800/8n1/flow=2" where flow is 0 for none,
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* 1 for rts/cts and 2 for xon/xoff.
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*
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* @retval SR_OK Success.
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* @retval SR_ERR Failure.
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*/
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#define SERIAL_COMM_SPEC "^(\\d+)/([5678])([neo])([12])(.*)$"
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SR_PRIV int serial_set_paramstr(struct sr_serial_dev_inst *serial,
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const char *paramstr)
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{
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GRegex *reg;
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GMatchInfo *match;
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int speed, databits, parity, stopbits, flow, rts, dtr, i;
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char *mstr, **opts, **kv;
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speed = databits = parity = stopbits = flow = 0;
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rts = dtr = -1;
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sr_spew("Parsing parameters from \"%s\".", paramstr);
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reg = g_regex_new(SERIAL_COMM_SPEC, 0, 0, NULL);
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if (g_regex_match(reg, paramstr, 0, &match)) {
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if ((mstr = g_match_info_fetch(match, 1)))
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speed = strtoul(mstr, NULL, 10);
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g_free(mstr);
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if ((mstr = g_match_info_fetch(match, 2)))
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databits = strtoul(mstr, NULL, 10);
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g_free(mstr);
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if ((mstr = g_match_info_fetch(match, 3))) {
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switch (mstr[0]) {
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case 'n':
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parity = SERIAL_PARITY_NONE;
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break;
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case 'e':
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parity = SERIAL_PARITY_EVEN;
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break;
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case 'o':
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parity = SERIAL_PARITY_ODD;
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break;
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}
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}
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g_free(mstr);
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if ((mstr = g_match_info_fetch(match, 4)))
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stopbits = strtoul(mstr, NULL, 10);
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g_free(mstr);
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if ((mstr = g_match_info_fetch(match, 5)) && mstr[0] != '\0') {
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if (mstr[0] != '/') {
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sr_dbg("missing separator before extra options");
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speed = 0;
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} else {
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/* A set of "key=value" options separated by / */
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opts = g_strsplit(mstr + 1, "/", 0);
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for (i = 0; opts[i]; i++) {
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kv = g_strsplit(opts[i], "=", 2);
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if (!strncmp(kv[0], "rts", 3)) {
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if (kv[1][0] == '1')
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rts = 1;
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else if (kv[1][0] == '0')
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rts = 0;
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else {
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sr_dbg("invalid value for rts: %c", kv[1][0]);
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speed = 0;
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}
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} else if (!strncmp(kv[0], "dtr", 3)) {
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if (kv[1][0] == '1')
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dtr = 1;
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else if (kv[1][0] == '0')
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dtr = 0;
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else {
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sr_dbg("invalid value for dtr: %c", kv[1][0]);
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speed = 0;
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}
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} else if (!strncmp(kv[0], "flow", 4)) {
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if (kv[1][0] == '0')
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flow = 0;
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else if (kv[1][0] == '1')
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flow = 1;
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else if (kv[1][0] == '2')
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flow = 2;
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else {
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sr_dbg("invalid value for flow: %c", kv[1][0]);
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speed = 0;
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}
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}
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g_strfreev(kv);
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}
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g_strfreev(opts);
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}
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}
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g_free(mstr);
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}
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g_match_info_unref(match);
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g_regex_unref(reg);
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if (speed) {
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return serial_set_params(serial, speed, databits, parity,
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stopbits, flow, rts, dtr);
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} else {
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sr_dbg("Could not infer speed from parameter string.");
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return SR_ERR_ARG;
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}
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}
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/**
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* Read a line 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 buflen Size of the buffer.
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* @param[in] timeout_ms How long to wait for a line to come in.
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*
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* Reading stops when CR of LR is found, which is stripped from the buffer.
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*
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* @retval SR_OK Success.
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* @retval SR_ERR Failure.
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*/
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SR_PRIV int serial_readline(struct sr_serial_dev_inst *serial, char **buf,
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int *buflen, gint64 timeout_ms)
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{
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gint64 start;
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int maxlen, len;
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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->data) {
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sr_dbg("Cannot use unopened serial port %s.", serial->port);
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return -1;
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}
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timeout_ms *= 1000;
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start = g_get_monotonic_time();
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maxlen = *buflen;
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*buflen = len = 0;
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while(1) {
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len = maxlen - *buflen - 1;
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if (len < 1)
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break;
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len = serial_read(serial, *buf + *buflen, 1);
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if (len > 0) {
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*buflen += len;
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*(*buf + *buflen) = '\0';
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if (*buflen > 0 && (*(*buf + *buflen - 1) == '\r'
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|| *(*buf + *buflen - 1) == '\n')) {
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/* Strip CR/LF and terminate. */
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*(*buf + --*buflen) = '\0';
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break;
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}
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}
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if (g_get_monotonic_time() - start > timeout_ms)
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/* Timeout */
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break;
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if (len < 1)
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g_usleep(2000);
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}
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if (*buflen)
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sr_dbg("Received %d: '%s'.", *buflen, *buf);
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return SR_OK;
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}
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/**
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* Try to find a valid packet in a serial data stream.
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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 buflen Size of the buffer.
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* @param[in] packet_size Size, in bytes, of a valid packet.
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* @param is_valid Callback that assesses whether the packet is valid or not.
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* @param[in] timeout_ms The timeout after which, if no packet is detected, to
|
|
* abort scanning.
|
|
* @param[in] baudrate The baudrate of the serial port. This parameter is not
|
|
* critical, but it helps fine tune the serial port polling
|
|
* delay.
|
|
*
|
|
* @retval SR_OK Valid packet was found within the given timeout
|
|
* @retval SR_ERR 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 %s (timeout = %" PRIu64
|
|
"ms, baudrate = %d).", serial->port, 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;
|
|
}
|
|
if (len < 1)
|
|
g_usleep(byte_delay_us);
|
|
}
|
|
|
|
*buflen = ibuf;
|
|
|
|
sr_err("Didn't find a valid packet (read %d bytes).", *buflen);
|
|
|
|
return SR_ERR;
|
|
}
|
|
|
|
/**
|
|
* Extract the serial device and options from the options linked list.
|
|
*
|
|
* @param options List of options passed from the command line.
|
|
* @param serial_device Pointer where to store the exctracted serial device.
|
|
* @param serial_options Pointer where to store the optional extracted serial
|
|
* options.
|
|
*
|
|
* @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.
|
|
*/
|
|
SR_PRIV int sr_serial_extract_options(GSList *options, const char **serial_device,
|
|
const char **serial_options)
|
|
{
|
|
GSList *l;
|
|
struct sr_config *src;
|
|
|
|
*serial_device = NULL;
|
|
|
|
for (l = options; l; l = l->next) {
|
|
src = l->data;
|
|
switch (src->key) {
|
|
case SR_CONF_CONN:
|
|
*serial_device = g_variant_get_string(src->data, NULL);
|
|
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);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!*serial_device) {
|
|
sr_dbg("No serial device specified");
|
|
return SR_ERR;
|
|
}
|
|
|
|
return SR_OK;
|
|
}
|
|
|
|
SR_PRIV int serial_source_add(struct sr_serial_dev_inst *serial, int events,
|
|
int timeout, sr_receive_data_callback_t cb, void *cb_data)
|
|
{
|
|
#ifdef _WIN32
|
|
return SR_ERR;
|
|
#else
|
|
int fd;
|
|
sp_get_port_handle(serial->data, &fd);
|
|
return sr_source_add(fd, events, timeout, cb, cb_data);
|
|
#endif
|
|
}
|
|
|
|
SR_PRIV int serial_source_remove(struct sr_serial_dev_inst *serial)
|
|
{
|
|
#ifdef _WIN32
|
|
return SR_ERR;
|
|
#else
|
|
int fd;
|
|
sp_get_port_handle(serial->data, &fd);
|
|
return sr_source_remove(fd);
|
|
#endif
|
|
}
|