#include <fcntl.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <stdio.h>
#include <signal.h>
#include <unistd.h>
{
struct termios tty;
memset (&tty, 0, sizeof tty);
if (tcgetattr (fd, &tty) != 0)
{
printf ("error %d from tcgetattr\n", errno);
return -1;
}
cfsetospeed (&tty, speed);
cfsetispeed (&tty, speed);
cfmakeraw(&tty); /* RAW mode */
tty.c_cflag = (tty.c_cflag & ~CSIZE) | CS8; // 8-bit chars
// disable IGNBRK for mismatched speed tests; otherwise receive break
// as \000 chars
tty.c_iflag &= ~IGNBRK; // disable break processing
tty.c_lflag = 0; // no signaling chars, no echo,
// no canonical processing
tty.c_oflag = 0; // no remapping, no delays
tty.c_cc[VMIN] = 0; // read doesn't block
tty.c_cc[VTIME] = 5; // 0.5 seconds read timeout
tty.c_iflag &= ~(IXON | IXOFF | IXANY); // shut off xon/xoff ctrl
tty.c_cflag |= (CLOCAL | CREAD);// ignore modem controls,
// enable reading
tty.c_cflag &= ~(PARENB | PARODD); // shut off parity
tty.c_cflag |= parity;
tty.c_cflag &= ~CSTOPB;
tty.c_cflag &= ~CRTSCTS;
if (tcsetattr (fd, TCSANOW, &tty) != 0)
{
printf ("error %d from tcsetattr\n", errno);
return -1;
}
return 0;
}
static void set_blocking (int fd, int should_block)
{
struct termios tty;
memset (&tty, 0, sizeof tty);
if (tcgetattr (fd, &tty) != 0)
{
printf ("error %d from tggetattr\n", errno);
return;
}
tty.c_cc[VMIN] = should_block ? 1 : 0;
tty.c_cc[VTIME] = 5; // 0.5 seconds read timeout
if (tcsetattr (fd, TCSANOW, &tty) != 0)
printf ("error %d setting term attributes\n", errno);
}
int main(int argc, char**argv)
{
const char *ttyName = "/dev/ttyTHS1";
int ttyFd = open (ttyName, O_RDWR | O_NOCTTY | O_SYNC);
if (ttyFd) {
set_interface_attribs (ttyFd, B9600, 0); // set speed to 115,200 bps, 8n1 (no parity)
set_blocking (ttyFd, 0); // set no blocking
} else
printf ("error %d opening %s: %s\n", errno, ttyName, strerror (errno));
char data[5] = "1234"
write(fd, data, 4);
return 0;
}
