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:

#include <reg52.h>
#define uint unsigned int
#define uchar unsigned char
uint receive ;
 
 void tranData();
 void delay(uint ms)
 {
     for( ;ms>0;ms--);
 
 }
void main(void)
{ 
     EA = 1; //允许总中断（如不使用中断，可用//屏蔽）
    ES = 1; //允许UART串口的中断
    TMOD = 0x20;    //定时器T/C1工作方式2
    SCON = 0x50;    //串口工作方式1，允许串口接收（SCON = 0x40 时禁止串口接收）
    TH1 = 0xF3;    //定时器初值高8位设置   //12MHZ晶振，波特率为4800 0xf3
    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
    PCON = 0x80;    //波特率倍频（屏蔽本句波特率为2400）
    TR1 = 1;    //定时器启动    
       
   while(1)
   {   
       receive=SBUF;
          tranData();
       delay(500000)    ;
   }  
}

void tranData() //interrupt 4
{       RI=0;
       if((receive==0x31))
       {
           SBUF='a';
           while(!TI);
            TI=0;
                   
       }
        else if((receive==0x32))
       {
              TI=1;
       }  
 
}

 

中断:

#include <reg52.h>
#define uint unsigned int
#define uchar unsigned char
uint receive ;
 
 void tranData();
 void delay(uint ms)
 {
     for( ;ms>0;ms--);
 
 }
void main(void)
{ 
     EA = 1;  
    ES = 1;  
    TMOD = 0x20; 
    SCON = 0x50; 
    TH1 = 0xF3;     
    TL1 = 0xF3; 
    PCON = 0x80;     
    TR1 = 1;  
       
   while(1);
}

void tranData()  interrupt 4
{      
       receive=SBUF;
       while(1)
       {
             if (receive==0x31)
          {
                SBUF='a';
              while(!TI);
              TI=0;
          }
          else if (receive==0x32)
          {
                TI=1;
          }
       
             RI=0; 
          receive=SBUF;
             delay(500000);
          } 
}