p13_2.c

单片机原理与应用实例教程 单片机原理与应用实例教程

#include "REG51.H"
sbit COL1 = P2^2;
sbit COL2 = P2^1;
sbit COL3 = P2^0;
sbit ROW1 = P2^5;
sbit ROW2 = P2^6;
sbit ROW3 = P2^7;
#define LED7 P1

void Delay()
{
	unsigned char i, j;
	for( i = 0; i < 0xff; i ++ )
	{
		for( j = 0; j < 0x0f; j ++ )
		{
		}
	}
}
unsigned char Table[] = {
		0x40, 0x4f, 0x24, 0x30, 0x19,
		0x12, 0x02, 0x78, 0x00, 0x10 };
void  INT_0(void) interrupt 0
{
	unsigned char i, D;
	EX0 = 0;
	D = 0xdf;
	for( i = 0; i < 3; i ++ )
	{
		P2 = 0xff;
		P2 = D;
		if( COL1 == 0 ){
			LED7 = Table[ i * 3 + 1 ];
			break;
		}
		else if( COL2 == 0 ){
			LED7 = Table[ i * 3 + 2 ];
			break;
		}
		else if( COL3 == 0 ){
			LED7 = Table[ i * 3 + 3 ];
			break;
		}
		D = D << 1; 
		D = D | 0x0f;
	}
	Delay();
	EX0 = 1;
} 
main()
{
	EX0 = 1;
	IT0 = 1;
	EA	= 1;
	LED7 = 0xff;
	while(1)
	{
		ROW1 = 0;
		ROW2 = 0;
		ROW3 = 0;
		COL1 = 1;
		COL2 = 1;
		COL3 = 1;
	}
}