Linux 串口驱动测试代码(2)

int OpenDev(char *Dev)
{
 int fd = open( Dev, O_RDWR | O_NOCTTY);  //| O_NOCTTY | O_NDELAY
 if (-1 == fd)
 {   
  perror("Can't Open Serial Port");
  return -1; 
 }
 else
  return fd;
}

int main(int argc, char **argv)
{
 int uart_fd;
 int nread, nwrite;
 int num = 0;
 char rev_char[128];
 char rev_buf[128];
 char *buff="hello! this is a serial test program,if you can see this,you success!\n";
 char *dev  = "/dev/ttyAMA2"; //串口二
 
 uart_fd = OpenDev(dev); //打开设备
 set_speed(uart_fd, 9600); //设置波特率
 
 if (set_Parity(uart_fd,8,1,'n') == FALSE)  //数据位，停止位，校验位
 {
  printf("Set Parity Error\n");
  exit (0);
 }

while(nread = read(uart_fd, rev_char, 1))  //读返回值
 {
  rev_buf[num++] = rev_char[0];
  if (rev_char[0] == '\n')
  {
   rev_buf[num] = '\0';
   num = 0;
   printf("%s", rev_buf);
  }
  printf("%s", rev_buf);
  if((nwrite = write(uart_fd,buff,strlen(buff)))>0)
  {
   printf("%s\n",buff);
  }
 }

if (nread == 0)
  printf("No  DATE!\n");
 }
 close(uart_fd);
}