串口通信

ID:424834 · 發表于 2018-11-21 20:32

#include <REG52.H>

sbit LED = P1^0;
unsigned char UART_buff;
bit New_rec = 0, Send_ed = 1, Money = 0;
//----------------------------------------------
void main (void)
{
SCON = 0x50; //串口方式1, 8-n-1, 允許接收.
TMOD = 0x20; //T1方式2
TH1 = 0xFD; //9600bps@11.0592MHz
TL1 = 0xFD;
TR1 = 1;
ES  = 1;    //開中斷.
EA  = 1;

while(Money == 0); //等著交費，呵呵，等著接收$.

while(1)  {
   if ((New_rec == 1) && (Send_ed == 1))  {  //如果收到新數據及發送完畢
      SBUF = UART_buff; //那就發送.
      New_rec = 0;
      Send_ed = 0;
} }
}
//----------------------------------------------
void ser_int (void) interrupt 4
{
if(RI == 1) {  //如果收到.
   RI = 0;    //清除標志.
   New_rec = 1;
   UART_buff = SBUF;  //接收.
   if(UART_buff == '1')  LED = 1;
   if(UART_buff == '0')  LED = 0;
   if(UART_buff == '$')  Money = 1;
}
else  {       //如果送畢.
   TI = 0;    //清除標志.
   Send_ed = 1;
}
}

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串口通信