button debounce

#define GPIO_IN_1 PIN7_bp // PortJ

u16 state = 0;

bool debounce() {

    state = (state<<1) | (PORTJ.IN & (1<<GPIO_IN_1)) | 0xfe00;

    return (state == 0xff00);

    }

int main(void)

{

    while(1)

    {

          if (debounce())

{

//PORTJ.OUT =  0b00100000;

if(ADC_Arc_Hit == 0)

{

ADC_Arc_Hit = 1; 

}

else

{

ADC_Arc_Hit = 0;

}

}

}