====Using with avr-gcc==== ;;;; assemble with:- avr-gcc -c ledon.S ;;;; the output file produced is ledon.o ;;;; use:- avr-objcopy -O ihex ledon.o ledon.hex to get intel hex file ;;;; upload this file to the arduino using avrdude:- ;;;; avrdude -p m328p -c Arduino -P /dev/ttyACM0 -b 115200 -Uflash:w:ledon.hex:i -v -v ; Load the binary pattern 11111111 into Register 16 LDI R16, 0b11111111 ; send all the 1s to the Data direction register at address 0x04 ; to configures all lines on Portb as an Outputs OUT 0x04, R16 ; not really needed, already loaded wits 1s. ;but later if we put all zeros here the LED would go off LDI R16, 0b11111111 ; Send all the 1s to all lines on port B at address 0x05. ;A 1 takes the line up to 5 volts and lights the LED ;A 0 takes the line down to 0 volts and the LED goes off. OUT 0x05, R16 ; If we had an LED connected to each line of port b, they would all light up. stop: rjmp stop ;don't run on past end of program