serial.c

51单片机

#include <reg51.h>
unsigned char n, temp;
unsigned char a[27];

void delay_ms(unsigned char t)
{
	unsigned char i;
	while(t-->0)for(i=120;i>0;i--);
}

void Uart_Unit(void)
{
  SCON = 0x50; //串口工作方式1，波特率9600,晶振 11.0592M
  PCON = 0;
  TH1 = 0xfd;
  TL1 = 0xfd;
  TMOD = 0x20;
  IE = 0x91;
  IT0 = 1;
  TR1 = 1;
  P0 = 0;
}

void main() //主函数
{
  char i;

  Uart_Unit();

  for (i = 0; i < 26; i++) a[i] = 'A'+i;
  a[26] = '\n';
  
  while (1)
  {
	for (n = 0; n < 27; n++)
  	{
    	SBUF = a[n];
    	while (!TI) ;
    	TI = 0;
		delay_ms(100);
  	}
  }
}

void receving()interrupt 4  //串口中断程序,接收数据
{
  temp = SBUF;
  P0 = temp;
  RI = 0;
}