key.c

来自「单片及c语言轻松入门的随书光盘」· C语言 代码 · 共 14 行

#include "reg51.h"
void main()
{	unsigned char KeyValue;
	for(;;)
	{	P3|=0xc3;
		KeyValue=P3|0xfb;
		if(KeyValue!=0xff)
			P1=0;
		KeyValue=P3|0xf7;
		if(KeyValue!=0xff)
			P1=0xff;
	}
}