チャタリング防止

#include "iodefine.h"

#define light 0

#define down 1

int main(){

char sw=1;

char rw=1;

long i;

char state=down;

PB.DDR=0xff;

PA.DDR=0x00;

PB.DR.BYTE=0xff;

PA.DR.BYTE=0xff;

while(1){

i=1000;

while(i--);

sw=PA.DR.BIT.B0;

if((sw==0)&&(rw==1)){

switch (state){

case down:

state=light;

PB.DR.BIT.B0=0;

break;

case light:

state=down;

PB.DR.BIT.B0=1;

break;

default:

state=down;

PB.DR.BIT.B0=1;

break;

}

}

rw=sw;

}

}