matridemo.c.bak

来自「C51实现键盘操作」· BAK 代码 · 共 41 行

/*


*/

#include<reg51.h>

#define uchar unsigned char


uchar code digit[16] = {0x06,0xFF,0xFF,0xFF,										//数据表
												0xFF,0xFF,0xFF,0xFF,
												0xFF,0xFF,0xFF,0xFF,
												0xFF,0xFF,0xFF,0xFF,};
												
void delay(){																						//延迟10ms
	uchar i,j;
	for(i = 0; i< 20; i++)
		for(j = 0; j < 248; j++)
			;
}


 
void main(){
	uchar key = 1;
	while(1){
		P3 = 0x0F;
		
		if((P3&0x0F)!=0x0F){																//判断是否有键按下
			delay();
			P3 = 0xEF;
			if((P3&0x0F)==0x0E) key = 0;
			while((P3&0x0F)!=0x0F);
		}
		P1 = digit[key];
	}	
}