delay.c

QH_MCU_V1.1单片机C源码. 内含实验程序 这是修改版.

#include <REG51.H>
#include <sys.h>
#include <intrins.h>

bit  read_flag;
void delay (uchar utimes);
void ISRSER() interrupt 4 using 3
  {
    uchar a;
	 
  if (RI)
    {
	    
       RI=0;
	   a=SBUF;
      if (a==0xac)
	   read_flag=1;
	  else 
	    read_flag=0;
	  SBUF=a;
	  while(TI==0);
	  TI=0;
    }
  }
  
void isr_ex0(void)interrupt 0 using 0
{
	EA = 0;
	read_flag = 1;
	EA = 1;
}

void isr_ex1(void)interrupt 2 using 0
{
	EA = 0;
	read_flag = 0;
	EA = 1;
}


void main()
{
  delay(10);
	SCON |= 0x50;  /* mode 1: 8-bit UART, enable receiver */ 
	TMOD |= 0x20; /* timer 1 mode 2: 8-Bit reload */ 
	PCON |= 0x80; // baud x2
	TH1 = 0xfd;   //串口初始化 0xfd=19200,0xfa=9600,0xf4=4800,0xe8=2400,0xd0=1200  
	TR1 = 1;
	EA = 1;
	ES = 1;  // Turn on Series Interrupte;
  EX0 = 1;
  EX1 = 1;


	while(1)
	{

	     if (read_flag==1) 

		   {
			   delay (250);		   	 
		   	 P0 = 0x4f;
		     P2 = 0xf7;
			   delay (250);
			   delay (250);
			   P0 = 0x00;
			   P2 = 0xff;
			   delay (250);
		   }
   

	}
}

void delay(uchar utimes)
{
  uchar i = 0;
	uchar j = 0;
  for (j=0;j<utimes;j++)
   {
    for (i=0; i<250; i++)
	  ;
   }
}