led_scan.c

一个基于51单片机的定时报警设计电路及程序

#include<reg52.h>

unsigned char code zimo[10]={0xc0,0xf9,0xa4,0xb0,	// 0, 1, 2, 3
				0x99,0x92,0x82,0xf8,0x80,0x90};// 4, 5, 6, 7, 8, 9
unsigned char code disflag[6]={0x20,0x10,0x08,0x04,0x02,0x01};
unsigned char flag,n;
unsigned char disbuf[6];
int main()
{
	unsigned char i;
	P0 = 0xff;
	P2 = 0xff;
	TMOD = 0x01;
	TH0 = 0xfe;
	TL0 = 0x0c;
	IE = 0x82;
	flag=0;
	n=0;
	for(i=0;i<6;i++)
	{
		disbuf[i]=zimo[i];
	}
	TR0=1;
	while(1);
	return 0;
}

void timer0(void) interrupt 1
{
	TH0=0xfe;
	TL0=0x0c;
//	KeyDelaytime++;
	if(flag<2)
	{
		P0=disbuf[n];
		P2=disflag[n];
	 }
	else
	{
		P2=0x00;
		P0=0;
	 }
	 flag++;
	 if(flag==8)
	 {
		n++;
		if(n==6)
		{
			n=0;
		}
		flag=0;
	}
}