//將J4的1腳與J5的2腳用短路線短接.
/*------------------------------------------------------------------------
按下S4鍵小燈就亮一下，CP-端拉低。
功能:比較器正端輸入外部電壓+2.5V,負(fù)端接到按鍵S4上.當(dāng)CP+>CP-小燈亮即當(dāng)按下S4鍵LED亮.
--------------------------------------------------------------------------*/
#include "C8051F350.h"
#include <intrins.h>
void CPT0_ISR (void);

//sbit S4=P1^5; 
sbit LED=P0^1; 
unsigned int i;

void  Comparator_Init(void)
{


     int i = 0;
    CPT0CN    = 0x8F;
    for (i = 0; i < 35; i++);  // Wait 10us for initialization
    CPT0CN    &= ~0x30;
    CPT0MX    = 0x61;
    CPT0MD    = 0x22;



}
//This is the port Init setup:
void PORT_Init(void)
{
	P1MDIN = 0xff; 
                       // P0.0analog input 
	P1SKIP = 0xff; 

                       // P1.5analog input 
 
                    // 跳過(guò)P1^5引腳                   
	P0MDOUT = 0x02; 
     LED=0;              // enable P1.0 outputs as push pull

                
	XBR1 = 0x40;// enable crossbar 禁止
 
}

void main( void )
{
	PCA0MD &= ~0x40; // disable watchdog
	PORT_Init();
	Comparator_Init();

	LED=0;
	EA=1;
	EIE1|=0X20;


}


void sleep_ms(unsigned int count)
{
  	unsigned char ii,jj;
  	for(ii=0;ii<count;ii++)
    {
      	for(jj=0;jj<250;jj++)
	  	_nop_();			
    }	
}		 
void CPT0_ISR (void) interrupt 12
{
  	CPT0CN &=~ 0x30;		/*清中斷標(biāo)志位*/
  
	{for(i=0;i<200;i++);
	
		{	LED=1;			/*有鍵按下*/
		sleep_ms(200);
		sleep_ms(200);
		sleep_ms(200);
		LED=0;
		}
	}
}