4. Flashing a crate to a real AVR chip

The AVRDUDE utility is recommended for flashing the final ELF file to a physical AVR microcontroller.

Flashing a Rust ELF file is no different to flashing a regular AVR-GCC C/C++ generated ELF file.

Arduino Uno

Connect your Arduino Uno to your computer, and use avrdude to flash your crate. The example below uses the output from the blink example.

avrdude -patmega328p -carduino -P[PORT] -b115200 -D -Uflash:w:target/avr-atmega328p/release/blink.elf:e


  • -patmega328p is the AVR part number
  • -carduino is the programmer
  • -P[PORT] is the serial port of your connected Arduino
    • On Linux & macOS, replace [PORT] with your Arduino's serial port (like /dev/ttyUSB0)
  • -b115200 is the baud rate
  • -D disables flash auto-erase
  • -Uflash:w:target/avr-atmega328p/release/blink.elf:e writes the blink.elf program to the Arduino's flash memory

For more debugging information, run avrdude with one or more -v flags.

Note: on older Arduino versions, you may get a series of avrdude: stk500_getsync(): not in sync: resp=0x00 errors indicating you need to use a slower baud rate:

avrdude -patmega328p -carduino -P/dev/[PORT] -b57600 -D -Uflash:w:target/avr-atmega328p/release/blink.elf:e