; port functions

PORT_INIT:

	; port b 0-3 -> output
	ldi tmp1,0x0f
	out DDRB,tmp1

	; g, rck, sck -> low / scl -> high
	cbi PORTB,(1<<0)|(1<<1)|(1<<2)
	sbi PORTB,(1<<3)

	; port d 6 -> output
	ldi tmp1,(1<<6)
	out DDRD,tmp1

	; ser -> low
	cbi PORTD,(1<<6)

	ret