Serial-mcu

任务: PC按下1键, mcu连续发送a, 当PC按下2键, 终止发送

查询:

 1 #include <reg52.h>
 2 #define uint unsigned int
 3 #define uchar unsigned char
 4 uint receive ;
 5  
 6  void tranData();
 7  void delay(uint ms)
 8  {
 9      for( ;ms>0;ms--);
10  
11  }
12 void main(void)
13 { 
14      EA = 1; //允许总中断（如不使用中断，可用//屏蔽）
15     ES = 1; //允许UART串口的中断
16     TMOD = 0x20;    //定时器T/C1工作方式2
17     SCON = 0x50;    //串口工作方式1，允许串口接收（SCON = 0x40 时禁止串口接收）
18     TH1 = 0xF3;    //定时器初值高8位设置   //12MHZ晶振，波特率为4800 0xf3
19     TL1 = 0xF3;    //定时器初值低8位设置   //11.0592MHZ晶振，波特率为4800 0xf4   9600  0xfa   19200  0xfd
20     PCON = 0x80;    //波特率倍频（屏蔽本句波特率为2400）
21     TR1 = 1;    //定时器启动    
22        
23    while(1)
24    {   
25        receive=SBUF;
26           tranData();
27        delay(500000)    ;
28    }  
29 }
30 
31 void tranData() //interrupt 4
32 {       RI=0;
33        if((receive==0x31))
34        {
35            SBUF='a';
36            while(!TI);
37             TI=0;
38                    
39        }
40         else if((receive==0x32))
41        {
42               TI=1;
43        }  
44  
45 }
46 
47

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中断:

 1 #include <reg52.h>
 2 #define uint unsigned int
 3 #define uchar unsigned char
 4 uint receive ;
 5  
 6  void tranData();
 7  void delay(uint ms)
 8  {
 9      for( ;ms>0;ms--);
10  
11  }
12 void main(void)
13 { 
14      EA = 1;  
15     ES = 1;  
16     TMOD = 0x20; 
17     SCON = 0x50; 
18     TH1 = 0xF3;     
19     TL1 = 0xF3; 
20     PCON = 0x80;     
21     TR1 = 1;  
22        
23    while(1);
24 }
25 
26 void tranData()  interrupt 4
27 {      
28        receive=SBUF;
29        while(1)
30        {
31              if (receive==0x31)
32           {
33                 SBUF='a';
34               while(!TI);
35               TI=0;
36           }
37           else if (receive==0x32)
38           {
39                 TI=1;
40           }
41        
42              RI=0; 
43           receive=SBUF;
44              delay(500000);
45           } 
46 }
47 
48

View Code