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>;ms--);

  }
 void main(void)
 {
      EA = ; //允许总中断（如不使用中断，可用//屏蔽）
     ES = ; //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 = ;    //定时器启动    

    while()
    {
        receive=SBUF;
           tranData();
        delay()    ;
    }
 }

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

        }
         else if((receive==0x32))
        {
               TI=;
        }  

 }

中断:

 #include <reg52.h>
 #define uint unsigned int
 #define uchar unsigned char
 uint receive ;

  void tranData();
  void delay(uint ms)
  {
      for( ;ms>;ms--);

  }
 void main(void)
 {
      EA = ;
     ES = ;
     TMOD = 0x20;
     SCON = 0x50;
     TH1 = 0xF3;
     TL1 = 0xF3;
     PCON = 0x80;
     TR1 = ;  

    while();
 }

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

              RI=;
           receive=SBUF;
              delay();
           }
 }