int open_serial_port(const char *port_name)
{
int r;
if (port_fd >= 0) {
close(port_fd);
}
port_fd = open(port_name, O_RDWR);
if (port_fd < 0) {
report_open_error(port_name, errno);
return -1;
}
r = set_baud(baud_rate);
if (r == 0) {
printf("Port \"%s\" opened at %s baud\r\n",
port_name, baud_rate);
} else {
printf("Port \"%s\" opened, unable to set baud to %s\r\n",
port_name, baud_rate);
}
#ifdef LINUX
{
struct serial_struct kernel_serial_settings;
/* attempt to set low latency mode, but don't worry if we can't */
r = ioctl(port_fd, TIOCGSERIAL, &kernel_serial_settings);
if (r < 0) return 0;
kernel_serial_settings.flags |= ASYNC_LOW_LATENCY;
ioctl(port_fd, TIOCSSERIAL, &kernel_serial_settings);
}
#endif
return 0;
}
void open_serial_port(const char *port_name)
{
int r;
struct serial_struct kernel_serial_settings;
if (port_fd >= 0) {
close(port_fd);
}
port_fd = open(port_name, O_RDWR | O_NDELAY | O_NOCTTY);
if (port_fd < 0) {
report_open_error(port_name, errno);
return;
}
r = set_baud(baud_setting());
if (r == 0) {
printf("Port \"%s\" opened at %s baud\r\n",
port_name, baud_setting());
new_port_setting(port_name);
} else {
printf("Port \"%s\" opened, unable to set baud to %s\r\n",
port_name, baud_setting());
}
/* attempt to set low latency mode, but don't worry if we can't */
r = ioctl(port_fd, TIOCGSERIAL, &kernel_serial_settings);
if (r < 0) return;
kernel_serial_settings.flags |= ASYNC_LOW_LATENCY;
ioctl(port_fd, TIOCSSERIAL, &kernel_serial_settings);
}
int open_serial_port(const char *port_name)
{
int r;
struct termios term_setting;
if (port_fd >= 0) {
close(port_fd);
}
port_fd = open(port_name, O_RDWR);
if (port_fd < 0) {
report_open_error(port_name, errno);
return -1;
}
bzero(&term_setting, sizeof(term_setting));
term_setting.c_cflag = (CS8 | CREAD);
term_setting.c_cc[VMIN] = 1;
term_setting.c_cc[VTIME] = 1;
r = tcsetattr(port_fd, TCSANOW, &term_setting);
if (r != 0) {
return -1;
}
r = set_baud(baud_rate);
if (r == 0) {
printf("Port \"%s\" opened at %s baud\r\n",
port_name, baud_rate);
}
else {
printf("Port \"%s\" opened, unable to set baud to %s\r\n",
port_name, baud_rate);
}
#ifdef LINUX
{
struct serial_struct kernel_serial_settings;
/* attempt to set low latency mode, but don't worry if we can't */
r = ioctl(port_fd, TIOCGSERIAL, &kernel_serial_settings);
if (r < 0) {
return 0;
}
kernel_serial_settings.flags |= ASYNC_LOW_LATENCY;
ioctl(port_fd, TIOCSSERIAL, &kernel_serial_settings);
}
#endif
return 0;
}
