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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/extensions/api/serial/serial_connection.h"
#include <sys/ioctl.h>
#include <termios.h>
namespace extensions {
bool SerialConnection::PostOpen() {
struct termios options;
// Start with existing options and modify.
tcgetattr(file_, &options);
// Bitrate (sometimes erroneously referred to as baud rate).
if (bitrate_ >= 0) {
cfsetispeed(&options, bitrate_);
cfsetospeed(&options, bitrate_);
}
// 8N1
options.c_cflag &= ~PARENB;
options.c_cflag &= ~CSTOPB;
options.c_cflag &= ~CSIZE;
options.c_cflag |= CS8;
options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
// Enable receiver and set local mode
// See http://www.easysw.com/~mike/serial/serial.html to understand.
options.c_cflag |= (CLOCAL | CREAD);
// Write the options.
tcsetattr(file_, TCSANOW, &options);
return true;
}
bool SerialConnection::GetControlSignals(ControlSignals &control_signals) {
int status;
if (ioctl(file_, TIOCMGET, &status) == 0) {
control_signals.dcd = (status & TIOCM_CAR) != 0;
control_signals.cts = (status & TIOCM_CTS) != 0;
return true;
}
return false;
}
bool SerialConnection::
SetControlSignals(const ControlSignals &control_signals) {
int status;
if (ioctl(file_, TIOCMGET, &status) != 0)
return false;
if (control_signals.should_set_dtr) {
if (control_signals.dtr)
status |= TIOCM_DTR;
else
status &= ~TIOCM_DTR;
}
if (control_signals.should_set_rts) {
if (control_signals.rts)
status |= TIOCM_RTS;
else
status &= ~TIOCM_RTS;
}
return ioctl(file_, TIOCMSET, &status) == 0;
}
} // namespace extensions
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