key.c

用51单片机的IO口采集按键信息

#include "51Training.h"

BYTE const DLEDcodeA[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
BYTE const Keyvalcode[12]={0x57,0x6e,0x5e,0x3e,0x6d,0x5d,0x3d,0x6b,0x5b,0x3b,0x67,0x37};


void Delay(WORD t)
{	while(t--);}


void DLEDdispNumA(WORD Num)
{
	P0=0xff;Num%=10000;
	DLEDcs1=DLEDcs2=DLEDcs3=DLEDcs4=1;P0=DLEDcodeA[Num/1000];DLEDcs1=0;Num%=1000;Delay(0x100);
	DLEDcs1=DLEDcs2=DLEDcs3=DLEDcs4=1;P0=DLEDcodeA[Num/100];DLEDcs2=0; Num%=100; Delay(0x100);
	DLEDcs1=DLEDcs2=DLEDcs3=DLEDcs4=1;P0=DLEDcodeA[Num/10];DLEDcs3=0;  Num%=10;  Delay(0x100);
	DLEDcs1=DLEDcs2=DLEDcs3=DLEDcs4=1;P0=DLEDcodeA[Num];DLEDcs4=0;               Delay(0x100);
	DLEDcs1=DLEDcs2=DLEDcs3=DLEDcs4=1;	
}

BYTE CllectKey()
{
	BYTE i,kval=0;
	
	P1=0xff;
	LED1=LED2=LED3=LED4=0;
	if((LED5==0)|(LED6==0)|(LED7==0))
	{
		Delay(1000);//Delay 10ms.
		if((LED5==0)|(LED6==0)|(LED7==0)) kval=P1&0x70;
		else return 0xff;
		P1=0xff;
		LED5=LED6=LED7=0;kval=kval|(P1&0xf);
		for(i=0;i<12;i++)
		{if(kval==Keyvalcode[i]) return i;}
	}
	return 0xff;
}
void main()
{
	BYTE val,oldval;
	P2=0;
	Delay(0xffff);
	val=oldval=0;
	while(1)
	{
		val=CllectKey();
		if(val!=0xff) oldval=val;
		DLEDdispNumA(oldval);
	}
}