?? 4x4key.c
字號:
//--------------------------------------------------------
#include <at89x51.h>
#include "4X4Key.h"
//--------------------------------------------------------
#define KEYPORT P1
#define HLINES 4
#define VLINES 4
//--------------------------------------------------------
unsigned char GetKey(void);
//--------------------------------------------------------
static unsigned char oldkey=0;
//--------------------------------------------------------
unsigned char GetKey(){
unsigned char i,j,tmp;
KEYPORT=0xf0;
tmp=~(KEYPORT|0x0f);
if(!tmp){oldkey=NOKEY;return NOKEY;}
if(oldkey!=NOKEY)return NOKEY;
for(i=0;i<HLINES;i++){
KEYPORT=~(1<<i);
tmp=~(KEYPORT|0x0f);
for(j=0;j<VLINES;j++)if(tmp==(0x10<<j)){
oldkey=i*4+j;
return oldkey;
}
}
return NOKEY;
}
//--------------------------------------------------------
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