#include <stdio.h>

#include <termios.h>

#include <fcntl.h>

#include <string.h>

 

int main()

{

  int fd;

  struct termios options;

  int n;

  char buff[15]="";

        

  /* Open Port */

  fd = open("/dev/ttySAC1", O_RDWR | O_NOCTTY | O_NDELAY);  /* <--- YOUR

PORT */

 

        

  if(fd == -1) {

                  printf("ERROR Open Serial Port!");

                }

              

 

  /* Serial Configuration */

  tcgetattr(fd, &options);   // Get Current Config

  cfsetispeed(&options, B9600); // Set Baud Rate

  cfsetospeed(&options, B9600);

  options.c_cflag = (options.c_cflag & ~CSIZE) | CS8;

  options.c_iflag =  IGNBRK;

  options.c_lflag = 0;

  options.c_oflag = 0;

  options.c_cflag |= CLOCAL | CREAD;

  options.c_cc[VMIN] = 1;

  options.c_cc[VTIME] = 5;

  options.c_iflag &= ~(IXON|IXOFF|IXANY);

  options.c_cflag &= ~(PARENB | PARODD);

 

  /* Save The Configure */

  tcsetattr(fd, TCSANOW, &options);

 

  /* Flush the input (read) buffer */

tcflush(fd,TCIOFLUSH);

printf ("\ntest point 1\n");                       

write(fd,"R",4);

printf ("\ntest point 2\n");    

 /* Flush the input (read) buffer */

printf ("\ntest point 3\n");  

tcflush(fd,TCIOFLUSH);

printf ("\ntest point 4\n");  

write(fd,"S",4);

sleep(4);

printf ("\ntest point 5\n");

read(fd,buff,10);   // Read Data From Serial Port

printf ("\ntest point 6\n : %s : \n",buff);   // Print Out

 

close(fd); // Close Port

  return 0; // End Program

}

현재 이렇게 해서 테스트를 해보았는데 제대로 동작이 되지 않고 있습니다..