Linux嵌入式串口UART测试程序

Linux串口UART测试程序，收到什么，打印什么。

#include
#include
#include
#include
#include
#include
#include
#include
#include
 
 
#define FALSE -1
#define TRUE 0
#define flag 1
#define noflag 0
 
int wait_flag = noflag;
int STOP = 0;
int res;
 
int speed_arr[] =
  { B38400, B19200, B9600, B4800, B2400, B1200, B300, B38400, B19200, B9600,
B4800, B2400, B1200, B300,B115200 };
int name_arr[] =
  { 38400, 19200, 9600, 4800, 2400, 1200, 300, 38400, 19200, 9600, 4800, 2400,
1200, 300, 115200,};
void
set_speed (int fd, int speed)
{
  int i;
  int status;
  struct termios Opt;
  tcgetattr (fd, &Opt);
  for (i = 0; i < sizeof (speed_arr) / sizeof (int); i++)
    {
      if (speed == name_arr[i])
      if (speed == name_arr[i])
	{
	  tcflush (fd, TCIOFLUSH);
	  cfsetispeed (&Opt, speed_arr[i]);
	  cfsetospeed (&Opt, speed_arr[i]);
	  status = tcsetattr (fd, TCSANOW, &Opt);
	  if (status != 0)
	    {
	      perror ("tcsetattr fd1");
	      return;
	    }
	  tcflush (fd, TCIOFLUSH);
	}
    }
}
 
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 &= ~CSIZE;
  options.c_lflag &= ~ECHO;  //这个是重点！！！！！！！！ 关闭回显功能 
  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 (parity)
    {
    case 'n':
    case 'N':
      options.c_cflag &= ~PARENB;	/* Clear parity enable */
      options.c_iflag &= ~INPCK;	/* Enable parity checking */
      break;
    case 'o':
    case 'O':
      options.c_cflag |= (PARODD | PARENB);
      options.c_iflag |= INPCK;	/* Disnable parity checking */
      break;
    case 'e':
    case 'E':
      options.c_cflag |= PARENB;	/* Enable parity */
      options.c_cflag &= ~PARODD;
      options.c_iflag |= INPCK;	/* Disnable parity checking */
      break;
    case 'S':
    case 's':			/*as no parity */
      options.c_cflag &= ~PARENB;
      options.c_cflag &= ~CSTOPB;
      break;
    default:
      fprintf (stderr, "Unsupported parity\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);
    }
  /* Set input parity option */
  if (parity != 'n')
    options.c_iflag |= INPCK;
  tcflush (fd, TCIFLUSH);
  options.c_cc[VTIME] = 150;
  options.c_cc[VMIN] = 0;	/* Update the options and do it NOW */
  if (tcsetattr (fd, TCSANOW, &options) != 0)
    {
      perror ("SetupSerial 3");
      return (FALSE);
    }
  return (TRUE);
}
 
void
signal_handler_IO (int status)
{
  printf ("received SIGIO signale.\n");
  wait_flag = noflag;
}
 
 
void StrToHex(unsigned char *pbDest, unsigned char *pbSrc, int nLen)
{
char h1,h2;
unsigned char s1,s2;
int i;
 
for (i=0; i
{
h1 = pbSrc[2*i];
h2 = pbSrc[2*i+1];
 
s1 = toupper(h1) - 0x30;
if (s1 > 9)
s1 -= 7;
 
s2 = toupper(h2) - 0x30;
if (s2 > 9)
s2 -= 7;
 
pbDest[i] = s1*16 + s2;
}
}
 
 
 
void print_use()
{
	printf("*************Send hex data to uart and waitting timeout recv data************************ \n");
        printf("uart-test -d [/dev/ttyS0] -b [Baudrate 115200] -s [hex data eg:AA550102] \n");	
	printf("uart-test -d [/dev/ttyS0] -b [Baudrate 115200] -s [hex data eg:AA550102] \n");
 	printf("uart-test -d [/dev/ttyS0] -b [Baudrate 115200] -s [hex data eg:AA550102] \n");	
	printf("******************************************************************* \n");
 
}
 
 
int main (int argc, char* argv[])
{
  int i=0; 
  int j=0;
  printf ("This program updates last time at %s   %s\n", __TIME__, __DATE__);
  printf ("TEST FOR ZTJY IOT HW \n");
  print_use();
  if(argc != 7)
	{
	print_use();
	return -1;
	}
 
  int fd;
 // fd = open (argv[2], O_RDWR|);
  fd = open (argv[2], O_RDWR|O_NOCTTY|O_NONBLOCK); //注意这里的标志位 是重点
  if (fd == -1)
    {
      perror ("serialport open error\n");
      return -1;
    }
  else
    {
      printf ("open ");
      printf ("%s", argv[2]);
      printf (" succesfully\n");
    }
 
  set_speed (fd, atoi(argv[4]));
  if (set_Parity (fd, 8, 1, 'N') == FALSE)
    {
      printf ("Set Parity Error\n");
      exit (0);
    }
 
  
  unsigned char sendData[1024]={0};
  StrToHex(sendData,argv[6],strlen(argv[6])/2); 
  write(fd,sendData,strlen(sendData));
  //fflush();
  printf("Send Data: \n");
  for(i=0;i<strlen(sendData);i++)
{
	printf("-0x%2x-",sendData[i]);
}
printf("\n");
 
  char buf[2048];
  fd_set rd;
  int nread = 0;
  while(1)
  {
  	FD_ZERO(&rd);
	FD_SET(fd, &rd);
	while(FD_ISSET(fd, &rd))
	{
		if(select(fd+1, &rd, NULL,NULL,NULL) < 0)
		{
			perror("select error\n");
		}
		else
		{
			while((nread = read(fd, buf, sizeof(buf))) > 0)
			{
				printf("nread = %d,%s\n",nread, buf);
				   for(j=0;j
					{
						printf("-0x%2x-",buf[j]);
					}
					printf("\n");
					printf("\n");
					printf("\n");
				memset(buf, 0 , sizeof(buf));
				printf("Exit uart-teset App\r\n");
				break;
			}
		}
	}
  }
  close (fd);
  printf("Exit uart-teset App");
  return 0;
}