; port functions

PORT_INIT:

	; port d 2 -> input (useless, default)
	cbi DDRD,2

	; switch pull-up off (useless, default)
	cbi PORTD,2

	; port d pin 6 -> output
	sbi DDRD,6

	; port d pin 6 -> high
	cbi PORTD,6

	; port d 3 -> output (debug 2)
	sbi DDRD,3

	ret

INT0_IR_CONF_R:

	; trigger interrupt on rising edge
	in tmp1,MCUCR
	sbr tmp1,(1<<ISC01)
	sbr tmp1,(1<<ISC00)
	out MCUCR,tmp1

	ret

INT0_IR_CONF_F:

	; trigger interrupt on rising edge
	in tmp1,MCUCR
	sbr tmp1,(1<<ISC01)
	cbr tmp1,(1<<ISC00)
	out MCUCR,tmp1

	ret

INT0_IR_CONF_FR:

	; trigger interrupt on falling and rising edge
	in tmp1,MCUCR
	cbr tmp1,(1<<ISC01)
	sbr tmp1,(1<<ISC00)
	out MCUCR,tmp1

	ret

INT0_IR_ENABLE:

	; enable interrupt
	in tmp1,GIMSK
	sbr tmp1,(1<<INT0)
	out GIMSK,tmp1

	ret

INT0_IR_DISABLE:

	; disable interrupt
	in tmp1,GIMSK
	cbr tmp1,(1<<INT0)
	out GIMSK,tmp1

	ret