-flash-led-avr marker -flash-led-avr \ PB5 is Arduino digital pin 13. $0023 constant pinb $0024 constant ddrb $0025 constant portb $0026 constant pinc $0027 constant ddrc $0028 constant portc $0029 constant pind $002a constant ddrd $002b constant portd 1 #5 lshift constant bit5 : init bit5 ddrb mset ; \ set pin as output : do_output portb c@ bit5 xor portb c! ; \ toggle the bit : main init begin do_output #500 ms again ; main