标题: 51单片机串口库文件com.h头文件,使用方便,添加即用 [打印本页]
作者: qwe1818    时间: 2021-10-2 12:19
标题: 51单片机串口库文件com.h头文件,使用方便,添加即用
c51串口库文件，使用方便，添加即用。
单片机源程序如下:
  1. #include "reg51.h"
  2. #include "intrins.h"

  4. typedef unsigned char BYTE;
  5. typedef unsigned int WORD;

  7. #define FOSC 11059200L      //System frequency
  8. #define BAUD 9600           //UART baudrate

  10. /*Define UART parity mode*/
  11. #define NONE_PARITY     0   //None parity
  12. #define ODD_PARITY      1   //Odd parity
  13. #define EVEN_PARITY     2   //Even parity
  14. #define MARK_PARITY     3   //Mark parity
  15. #define SPACE_PARITY    4   //Space parity

  17. #define PARITYBIT NONE_PARITY //EVEN_PARITY   //Testing even parity

  19. //yy sbit bit9 = P2^2;           //P2.2 show UART data bit9
  20. bit busy;

  22. void SendData(BYTE dat);
  23. void SendString(char *s);

  25. void InitCom()
  26. {
  27. #if (PARITYBIT ==NONE_PARITY )
  28.     SCON = 0x50;            //8-bit variable UART
  29. #elif (PARITYBIT == ODD_PARITY) || (PARITYBIT == EVEN_PARITY) || (PARITYBIT == MARK_PARITY)
  30.     SCON = 0xda;            //9-bit variable UART, parity bit initial to 1
  31. #elif (PARITYBIT == SPACE_PARITY)
  32.     SCON = 0xd2;            //9-bit variable UART, parity bit initial to 0
  33. #endif

  35.     TMOD = 0x20;            //Set Timer1 as 8-bit auto reload mode
  36.     TH1 = TL1 = -(FOSC/12/32/BAUD); //Set auto-reload vaule
  37.     TR1 = 1;                //Timer1 start run
  38.     ES = 1;                 //Enable UART interrupt
  39.     EA = 1;                 //Open master interrupt switch

  41.     SendString("yySTC12C5A60S2\r\nUart Test !\r\n");
  42.            SendData(0x31);
  43.     while(1);
  44. }

  46. /*----------------------------
  47. UART interrupt service routine
  48. ----------------------------*/
  49. void Uart_Isr() interrupt 4 using 1
  50. {
  51.     if (RI)
  52.     {
  53.         RI = 0;             //Clear receive interrupt flag
  54.         P0 = SBUF;          //P0 show UART data
  55. //yy        bit9 = RB8;         //P2.2 show parity bit
  56.     }
  57.     if (TI)
  58.     {
  59.         TI = 0;             //Clear transmit interrupt flag
  60.         busy = 0;           //Clear transmit busy flag
  61.     }
  62. }

  64. /*----------------------------
  65. Send a byte data to UART
  66. Input: dat (data to be sent)
  67. Output:None
  68. ----------------------------*/
  69. void SendData(BYTE dat)
  70. {
  71.     while (busy);           //Wait for the completion of the previous data is sent
  72.     ACC = dat;              //Calculate the even parity bit P (PSW.0)
  73.     if (P)                  //Set the parity bit according to P
  74.     {
  75. #if (PARITYBIT == ODD_PARITY)
  76.         TB8 = 0;            //Set parity bit to 0
  77. #elif (PARITYBIT == EVEN_PARITY)
  78.         TB8 = 1;            //Set parity bit to 1
  79. #endif
  80.     }
  81.     else
  82.     {
  83. #if (PARITYBIT == ODD_PARITY)
  84.         TB8 = 1;            //Set parity bit to 1
  85. #elif (PARITYBIT == EVEN_PARITY)
  86.         TB8 = 0;            //Set parity bit to 0
  87. #endif
  88.     }
  89.     busy = 1;
  90.     SBUF = ACC;             //Send data to UART buffer
  91. }

  93. /*----------------------------
  94. Send a string to UART
  95. Input: s (address of string)
  96. Output:None
  97. ----------------------------*/
  98. void SendString(char *s)
  99. {
  100.     while (*s)              //Check the end of the string
  101.     {
  102.         SendData(*s++);     //Send current char and increment string ptr
  103.     }
  104. }
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