STC89C52 UART程序

STC89C52UART程序：
1.UartMCUtoPC.zip (24.96 KB, 下载次数: 7)

2017-1-26 22:34 上传

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STC89C52UART程序

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. /*------------------------------------------------------------------*/
   
10. 
    
11. #include "reg51.h"
    
12. #include "intrins.h"
    
13. 
    
14. typedef unsigned char BYTE;
    
15. typedef unsigned int WORD;
    
16. 
    
17. #define FOSC 11059200L      //System frequency
    
18. #define BAUD 9600           //UART baudrate
    
19. 
    
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
    
26. 
    
27. //在此更改模式!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    
28. #define PARITYBIT NONE_PARITY   //Testing even parity
    
29. 
    
30. sbit bit9 = P2^2;           //P2.2 show UART data bit9
    
31. bit busy;
    
32. 
    
33. void SendData(BYTE dat);
    
34. void SendString(char *s);
    
35. 
    
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
    
45. 
    
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
    
51. 
    
52.     SendString("Hello 51\n");
    
53.     while(1);
    
54. }
    
55. 
    
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. }
    
73. 
    
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. }
     
102. 
     
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. }
     
115. 
     

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