RESET: ; Set PB5 as output sbi DDRB, 5
avr-gcc -mmcu=atmega328p -c blink.asm -o blink.o avr-gcc -mmcu=atmega328p blink.o -o blink.elf avr-objcopy -O ihex blink.elf blink.hex Or using original AVRASM32: avr assembler download
Now go download. Make that LED blink in pure Assembly. You'll never look at digitalWrite() the same way again. Last updated: 2025. Toolchain versions change, but the GNU assembler for AVR has been stable for 15+ years. If a link is dead, search for "avr-gcc" on your OS's package manager. RESET: ; Set PB5 as output sbi DDRB,