有人遇到过STC12C5A60S2串口2无法使用的问题吗？

有人遇到过STC12C5A60S2串口2无法使用的问题吗？串口1正常能收发数据，用的官网提供的例程，百度发现很多人都遇到这个问题，目前还没找到解决办法。下载过http://www.51hei.com/bbs/dpj-133507-1.html也无法使用。

1. /*------------------------------------------------------------------*/
   
2. /* --- STC MCU Limited ---------------------------------------------*/
   
3. /* --- STC12C5Axx Series MCU UART2 (8-bit/9-bit)Demo ---------------*/
   
4. /* --- Mobile: (86)13922805190 -------------------------------------*/
   
5. /* --- Fax: 86-0513-55012956,55012947,55012969 ---------------------*/
   
6. /* --- Tel: 86-0513-55012928,55012929,55012966----------------------*/
   
7. /* --- Web: www.STCMCU.com -----------------------------------------*/
   
8. /* --- Web: www.GXWMCU.com -----------------------------------------*/
   
9. /* If you want to use the program or the program referenced in the  */
   
10. /* article, please specify in which data and procedures from STC    */
    
11. /*------------------------------------------------------------------*/
    
12. 
    
13. #include "reg51.h"
    
14. #include "intrins.h"
    
15. 
    
16. typedef unsigned char BYTE;
    
17. typedef unsigned int WORD;
    
18. 
    
19. #define FOSC 11059200L      //System frequency
    
20. #define BAUD 115200         //UART baudrate
    
21. 
    
22. /*Define UART parity mode*/
    
23. #define NONE_PARITY     0   //None parity
    
24. #define ODD_PARITY      1   //Odd parity
    
25. #define EVEN_PARITY     2   //Even parity
    
26. #define MARK_PARITY     3   //Mark parity
    
27. #define SPACE_PARITY    4   //Space parity
    
28. 
    
29. #define PARITYBIT EVEN_PARITY   //Testing even parity
    
30. 
    
31. /*Declare SFR associated with the UART2 */
    
32. sfr AUXR  = 0x8e;           //Auxiliary register
    
33. sfr S2CON = 0x9a;           //UART2 control register
    
34. sfr S2BUF = 0x9b;           //UART2 data buffer
    
35. sfr BRT   = 0x9c;           //Baudrate generator
    
36. sfr IE2   = 0xaf;           //Interrupt control 2
    
37. 
    
38. #define S2RI  0x01          //S2CON.0
    
39. #define S2TI  0x02          //S2CON.1
    
40. #define S2RB8 0x04          //S2CON.2
    
41. #define S2TB8 0x08          //S2CON.3
    
42. 
    
43. bit busy;
    
44. 
    
45. void SendData(BYTE dat);
    
46. void SendString(char *s);
    
47. 
    
48. void main()
    
49. {
    
50. #if (PARITYBIT == NONE_PARITY)
    
51.     S2CON = 0x50;           //8-bit variable UART
    
52. #elif (PARITYBIT == ODD_PARITY) || (PARITYBIT == EVEN_PARITY) || (PARITYBIT == MARK_PARITY)
    
53.     S2CON = 0xda;           //9-bit variable UART, parity bit initial to 1
    
54. #elif (PARITYBIT == SPACE_PARITY)
    
55.     S2CON = 0xd2;           //9-bit variable UART, parity bit initial to 0
    
56. #endif
    
57. 
    
58.     BRT = -(FOSC/32/BAUD);  //Set auto-reload vaule of baudrate generator
    
59.     AUXR = 0x14;            //Baudrate generator work in 1T mode
    
60.     IE2 = 0x01;             //Enable UART2 interrupt
    
61.     EA = 1;                 //Open master interrupt switch
    
62. 
    
63.     SendString("STC12C5A60S2\r\nUart2 Test !\r\n");
    
64.     while(1);
    
65. }
    
66. 
    
67. /*----------------------------
    
68. UART2 interrupt service routine
    
69. ----------------------------*/
    
70. void Uart2() interrupt 8
    
71. {
    
72.     if (S2CON & S2RI)
    
73.     {
    
74.         S2CON &= ~S2RI;     //Clear receive interrupt flag
    
75.         P0 = S2BUF;         //P0 show UART data
    
76.         P2 = (S2CON & S2RB8);//P2.2 show parity bit
    
77.     }
    
78.     if (S2CON & S2TI)
    
79.     {
    
80.         S2CON &= ~S2TI;     //Clear transmit interrupt flag
    
81.         busy = 0;           //Clear transmit busy flag
    
82.     }
    
83. }
    
84. 
    
85. /*----------------------------
    
86. Send a byte data to UART
    
87. Input: dat (data to be sent)
    
88. Output:None
    
89. ----------------------------*/
    
90. void SendData(BYTE dat)
    
91. {
    
92.     while (busy);           //Wait for the completion of the previous data is sent
    
93.     ACC = dat;              //Calculate the even parity bit P (PSW.0)
    
94.     if (P)                  //Set the parity bit according to P
    
95.     {
    
96. #if (PARITYBIT == ODD_PARITY)
    
97.         S2CON &= ~S2TB8;    //Set parity bit to 0
    
98. #elif (PARITYBIT == EVEN_PARITY)
    
99.         S2CON |= S2TB8;     //Set parity bit to 1
    
100. #endif
     
101.     }
     
102.     else
     
103.     {
     
104. #if (PARITYBIT == ODD_PARITY)
     
105.         S2CON |= S2TB8;     //Set parity bit to 1
     
106. #elif (PARITYBIT == EVEN_PARITY)
     
107.         S2CON &= ~S2TB8;    //Set parity bit to 0
     
108. #endif
     
109.     }
     
110.     busy = 1;
     
111.     S2BUF = ACC;            //Send data to UART2 buffer
     
112. }
     
113. 
     
114. /*----------------------------
     
115. Send a string to UART
     
116. Input: s (address of string)
     
117. Output:None
     
118. ----------------------------*/
     
119. void SendString(char *s)
     
120. {
     
121.     while (*s)              //Check the end of the string
     
122.     {
     
123.         SendData(*s++);     //Send current char and increment string ptr
     
124.     }
     
125. }
     
126. 
     

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我之前用官网的历程发现有问题，后来就不用了

你可以试试这个

1. #include "reg51.h"
   
2. 
   
3. #define FOSC 11059200L
   
4. #define BAUD 115200
   
5. 
   
6. #define NONE_PARITY     0   //无校验位
   
7. #define ODD_PARITY      1   //奇校验
   
8. #define EVEN_PARITY     2   //偶校验
   
9. #define MARK_PARITY     3   //标记校验
   
10. #define SPACE_PARITY    4   //空校验
    
11. 
    
12. #define PARITYBIT NONE_PARITY
    
13. 
    
14. #define S2RI  0x01
    
15. #define S2TI  0x02
    
16. #define S2RB8 0x04
    
17. #define S2TB8 0x08
    
18. 
    
19. sfr AUXR  = 0x8e;
    
20. sfr S2CON = 0x9a;
    
21. sfr S2BUF = 0x9b;
    
22. sfr BRT   = 0x9c;
    
23. sfr IE2   = 0xaf;
    
24. 
    
25. bit busy;
    
26. 
    
27. void SendData(char dat);
    
28. void SendString(char *s);
    
29. 
    
30. void main()
    
31. {
    
32. #if (PARITYBIT == NONE_PARITY)
    
33.     S2CON = 0x5a;               //8位可变波特率 (无校验位)
    
34. #elif (PARITYBIT == ODD_PARITY) || (PARITYBIT == EVEN_PARITY) || (PARITYBIT == MARK_PARITY)
    
35.     S2CON = 0xda;               //9位可变波特率,校验位初始为1
    
36. #elif (PARITYBIT == SPACE_PARITY)
    
37.     S2CON = 0xd5;               //9位可变波特率,校验位初始为0
    
38. #endif
    
39. 
    
40.     BRT = -(FOSC/32/BAUD);      //设置独立波特率发生器的重载初值
    
41.     AUXR = 0x14;                //独立波特率发生器工作在1T模式
    
42.     IE2 = 0x01;                 //使能串口2中断
    
43.     EA = 1;                     //开总中断
    
44. 
    
45.     SendString("STC12C5A60S2\r\nUart2 Test !\r\n");
    
46.     while(1);
    
47. }
    
48. 
    
49. void Uart2() interrupt 8 using 1
    
50. {
    
51.     if (S2CON & S2RI)
    
52.     {
    
53.         S2CON &= ~S2RI;         //清除接收完成标志
    
54.         P0 = S2BUF;             //P0显示串口数据
    
55.         P2 = (S2CON & S2RB8);   //P2.2显示校验位
    
56.     }
    
57.     if (S2CON & S2TI)
    
58.     {
    
59.         S2CON &= ~S2TI;         //清除发送完成标志
    
60.         busy = 0;
    
61.     }
    
62. }
    
63. 
    
64. void SendData(char dat)
    
65. {
    
66.     while (busy);               //等待上个数据发送完成
    
67.     ACC = dat;                  //取得偶校验位P
    
68.     if (P)                                                //根据P来设置串口数据的校验位
    
69.     {
    
70. #if (PARITYBIT == ODD_PARITY)
    
71.         S2CON &= ~S2TB8;        //置校验位为0
    
72. #elif (PARITYBIT == EVEN_PARITY)
    
73.         S2CON |= S2TB8;         //置校验位为1
    
74. #endif
    
75.     }
    
76.     else
    
77.     {
    
78. #if (PARITYBIT == ODD_PARITY)
    
79.         S2CON |= S2TB8;         //置校验位为1
    
80. #elif (PARITYBIT == EVEN_PARITY)
    
81.         S2CON &= ~S2TB8;        //置校验位为0
    
82. #endif
    
83.     }
    
84.     busy = 1;
    
85.     S2BUF = ACC;                //发送数据
    
86. }
    
87. 
    
88. void SendString(char *s)
    
89. {
    
90.     while (*s)                  //判断字符串结束标志
    
91.     {
    
92.         SendData(*s++);         //发送字符
    
93.     }
    
94. }
    

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angmall 发表于 2019-5-1 10:51
你可以试试这个

对我很有用。十分感谢！！！