标题: STC89C52 UART程序 [打印本页]
作者: minhang    时间: 2017-1-26 22:35
标题: STC89C52 UART程序
STC89C52UART程序：
1.UartMCUtoPC.zip (24.96 KB, 下载次数: 7)

  1. /*------------------------------------------------------------------*/
  2. /* --- STC MCU Limited ---------------------------------------------*/
  3. /* --- STC89-90xx Series MCU UART (8-bit/9-bit)Demo ----------------*/
  4. /* --- Mobile: (86)13922805190 -------------------------------------*/
  5. /* --- Fax: 86-0513-55012956,55012947,55012969 ---------------------*/
  6. /* --- Tel: 86-0513-55012928,55012929,55012966----------------------*/
  7. /* If you want to use the program or the program referenced in the  */
  8. /* article, please specify in which data and procedures from STC    */
  9. /*------------------------------------------------------------------*/

  11. #include "reg51.h"
  12. #include "intrins.h"

  14. typedef unsigned char BYTE;
  15. typedef unsigned int WORD;

  17. #define FOSC 11059200L      //System frequency
  18. #define BAUD 9600           //UART baudrate

  20. /*Define UART parity mode*/
  21. #define NONE_PARITY     0   //None parity
  22. #define ODD_PARITY      1   //Odd parity
  23. #define EVEN_PARITY     2   //Even parity
  24. #define MARK_PARITY     3   //Mark parity
  25. #define SPACE_PARITY    4   //Space parity

  27. //在此更改模式!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
  28. #define PARITYBIT NONE_PARITY   //Testing even parity

  30. sbit bit9 = P2^2;           //P2.2 show UART data bit9
  31. bit busy;

  33. void SendData(BYTE dat);
  34. void SendString(char *s);

  36. void main()
  37. {
  38. #if (PARITYBIT == NONE_PARITY)
  39.     SCON = 0x50;            //8-bit variable UART
  40. #elif (PARITYBIT == ODD_PARITY) || (PARITYBIT == EVEN_PARITY) || (PARITYBIT == MARK_PARITY)
  41.     SCON = 0xda;            //9-bit variable UART, parity bit initial to 1
  42. #elif (PARITYBIT == SPACE_PARITY)
  43.     SCON = 0xd2;            //9-bit variable UART, parity bit initial to 0
  44. #endif

  46.     TMOD = 0x20;            //Set Timer1 as 8-bit auto reload mode
  47.     TH1 = TL1 = -(FOSC/12/32/BAUD); //Set auto-reload vaule
  48.     TR1 = 1;                //Timer1 start run
  49.     ES = 1;                 //Enable UART interrupt
  50.     EA = 1;                 //Open master interrupt switch

  52.     SendString("Hello 51\n");
  53.     while(1);
  54. }

  56. /*----------------------------
  57. UART interrupt service routine
  58. ----------------------------*/
  59. void Uart_Isr() interrupt 4 using 1
  60. {
  61.     if (RI)
  62.     {
  63.         RI = 0;             //Clear receive interrupt flag
  64.         P0 = SBUF;          //P0 show UART data
  65.         bit9 = RB8;         //P2.2 show parity bit
  66.     }
  67.     if (TI)
  68.     {
  69.         TI = 0;             //Clear transmit interrupt flag
  70.         busy = 0;           //Clear transmit busy flag
  71.     }
  72. }

  74. /*----------------------------
  75. Send a byte data to UART
  76. Input: dat (data to be sent)
  77. Output:None
  78. ----------------------------*/
  79. void SendData(BYTE dat)
  80. {
  81.     while (busy);           //Wait for the completion of the previous data is sent
  82.     ACC = dat;              //Calculate the even parity bit P (PSW.0)
  83.     if (P)                  //Set the parity bit according to P
  84.     {
  85. #if (PARITYBIT == ODD_PARITY)
  86.         TB8 = 0;            //Set parity bit to 0
  87. #elif (PARITYBIT == EVEN_PARITY)
  88.         TB8 = 1;            //Set parity bit to 1
  89. #endif
  90.     }
  91.     else
  92.     {
  93. #if (PARITYBIT == ODD_PARITY)
  94.         TB8 = 1;            //Set parity bit to 1
  95. #elif (PARITYBIT == EVEN_PARITY)
  96.         TB8 = 0;            //Set parity bit to 0
  97. #endif
  98.     }
  99.     busy = 1;
  100.     SBUF = ACC;             //Send data to UART buffer
  101. }

  103. /*----------------------------
  104. Send a string to UART
  105. Input: s (address of string)
  106. Output:None
  107. ----------------------------*/
  108. void SendString(char *s)
  109. {
  110.     while (*s)              //Check the end of the string
  111.     {
  112.         SendData(*s++);     //Send current char and increment string ptr
  113.     }
  114. }

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作者: admin    时间: 2017-2-12 23:42
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