51单片机串口接收数据

单片机每次发送或者接受完数据（8位数据将保存在缓冲区中），会自动触发接受或者发送中断。因此只需要中断置位以后再缓冲区中读数据（或者发送数据）。

1 /*************************************************

2 *receive code(HEX)

3 * $ P M T K 1 8 0 * 3 B n r

4 * 24 50 4D 54 4B 31 38 30 2A 33 42 0D 0A

5 *************************************************/

6

7 unsigned char code CmdData[dataMax] = {0x24,0x50,0x4D,0x54,0x4B,0x31,

8 0x38,0x30,0x2A,0x33,0x42,0x0D,0x0A};

9

10

11 /*************************************************

12 * UART interrupt subroutine

13 *********************************/

14 void UART_ISR (void) interrupt 4 //interrupt address is 0x0023

15 {

16

17 if (RI) //check Tx or Rx interrupt

18 {

19 RI = 0; //clear RI by software for next reception

20

21 if((TmpData = SBUF) == CmdData[index])

22 {

23 index++;

24 if(index == 13)

25 {

26 index = 0;

27 recv_flag = 1;

28 EA = 0; //disable global interrupt

29 }

30

31 }

32 else

33 {

34 index = 0;

35 }

36 }

37 }

38 /*************************************************

39 * Initial Timer 1

40 **************************************************/

41 void Timer1_Init (void)

42 {

43 TMOD = 0x20; //configure Timer 1 as auto-reload 8-bit mode

44 PCON |= 0x80; //double baud rate enable

45 TL1 = TH1 = U8BAUD_TIMER1; //baud rate 9600bps@22.1184MHz

46 TR1 = 1; //Timer 1 run

47 }

48

49 /*************************************************

50 * Main function

51 **************************************************/

52 void main (void)

53 {

54

55 P0OR |= 0x01; //enable P0 internal pull-up

56

57 #if BAUD_SOURCE

58 Timer2_Init();

59 #else

60 Timer1_Init();

61 #endif

62

63 SCON = 0x52; /*initial UART as mode 1, receive enable,

64 TI should be set before using "printf"*/

65 ES = 1; //enable UART interrupt

66 EA = 1; //enable global interrupt

67 delay_ms(700); // >= 700ms

68 while(1)

69 {

70 while(recv_flag)

71 {

72 recv_flag = 0;

73 P00 = 0; //with reset contrl

74 delay_ms(300); // >= 300mS 28/November/2014

75 P00 = 1;

76 delay_ms(100);

77 EA = 1;

78 }

79 //stop_key();

80 while(!P10);

81 }

82 }