原创 arm-linux 串口通信

int set_Parity(int fd,int databits,int stopbits,int parity)
{
  struct termios options;
  if(tcgetattr(fd,&options)!=0)
  {
   perror("SetupSerial 1");
   return(FALSE);
  }
  options.c_cflag |=CLOCAL | CREAD;
  options.c_cflag &=~CSIZE;
  switch(databits)
  {
   case 7:
   options.c_cflag |=CS7;  
   break;
   case 8:
   options.c_cflag |=CS8;  
   break;
   default:
   fprintf(stderr,"Unsupported data size\n");
   return(FALSE);
  }
  switch(stopbits)
  {
   case 1:
   options.c_cflag &=~CSTOPB;
   break;
   case 2:
   options.c_cflag |=CSTOPB;
   break;
   default:fprintf(stderr,"Unsupported stop bits\n");
   return(FALSE);
  }
  switch(parity)
  {
   case 'n':
   case 'N':
    options.c_cflag &=~PARENB;
    options.c_iflag &=~INPCK;
   break;
   case 'o':
   case 'O':
    options.c_cflag |=(PARODD | PARENB);
    options.c_iflag |=INPCK | ISTRIP;
   break;
   case 'e':
   case 'E':
    options.c_cflag |=PARENB;
    options.c_cflag &=~PARODD;
    options.c_iflag |=INPCK | ISTRIP;
   break;
   case 's': 
   case 'S':  
    options.c_cflag &= ~PARENB;
    options.c_cflag &= ~CSTOPB;
   break;
   default:
   fprintf(stderr,"Unsupported parity\n");
   return(FALSE);
  }
  if(parity!=('n'|'N'))
 options.c_iflag |=INPCK;

  options.c_iflag &= ~(IXON | IXOFF | IXANY);
  options.c_lflag &=~(ICANON | ECHO | ECHOE |ISIG);
  options.c_oflag &=~(OPOST);
  tcflush(fd,TCIFLUSH);
  options.c_cc[VTIME]=0;
  options.c_cc[VMIN]=0;

  if(tcsetattr(fd,TCSANOW,&options)!=0)
  {
   perror("SetupSerial 3");
   return(FALSE);
  }
  return(TRUE);
}

int main(int argc,char **argv)
{
   int fd;
   int nread;
   int nwrite;
   char temp_buff[1];
   char send_buf[] = "send data test !!!";
   char rec_buf[100] ={0};
   int i;
   fd =open("/dev/s3c2410_serial1",O_RDWR | O_NOCTTY); // | O_NDELAY |O_SYNC
   printf("---- fd : %d  ---\n",fd);
   if(fd == -1)
    exit(0);
   set_speed(fd,115200);
 
   if(set_Parity(fd,8,1,'N')==FALSE)
   {
    printf("-----Set Parity Error  Line: %u-----\n",__LINE__);
    exit (0);
   }
   printf("-----Set Parity ok  Line: %u-----\n",__LINE__);

   while(1)
   {
  nwrite = write(fd,send_buf,sizeof(send_buf));
  if(nwrite>0)
  {
   printf("-----send data len:%d -----\n",nwrite);
  }
  else
  {
   printf("-----Set Parity Error return :%d -----\n",nwrite);
  }

  //nread = read(fd,temp_buff,1);
  printf("-----rec val nread :%d -----\n",nread);
  while(1)
  {
   nread = read(fd,temp_buff,1);
   if(nread <= 0)
   {
    printf("-----No data rec nread:%d -----\n",nread);
    break;
   }
   rec_buf[i++] =temp_buff[0];
   temp_buff[0] = 0;
  }
  if(rec_buf != NULL)
  {
   printf("---rec data :%s ---- \n",rec_buf);
   memset(rec_buf,0,sizeof(rec_buf));
   i = 0;
  }
  sleep(1);
   }
  

   exit(0);
}