Leonardo bootloader

Using Arduino Microcontrollers
1

Hello,
I want to use my arduino with rust, which have merged the rust-avr project inside the main rust codebase.
But i also want to be able to push my code using usb, for that I need to push the bootloader and my binary from rust.
I'v fount the repository of the avr bootloader, it's this one right ? github.com/arduino/ArduinoCore-avr/bootloaders
But then… whitch one I should choose to get a simple bootlobder that allow me to push my code over usb and maybe use the serial over usb feature.

2

The bootloader used for the Leonardo is defined here:

leonardo.bootloader.file=caterina/Caterina-Leonardo.hex

That path is relative to the bootloadersfolder you linked to.

3

pert:
The bootloader used for the Leonardo is defined here:
ArduinoCore-avr/boards.txt at 1.8.3 · arduino/ArduinoCore-avr · GitHub

Thanks, it's not easy to find in whitch file that was defined.
Do you know if the optiboot can run on a leonardo ?

4

Looks like there is some good information about optiboot on the Leonardo's ATmega32U4 here:

5

Optiboot does serial bootloading only. It wouldn't help you load over the native USB on the chip (you'd need a separate USB/Serial converter.) That's one of the reasons that this remains an "issue" even though the idea is ~5 years old. :frowning:

If you already have an Arduino, it already has a bootloader, and you can load .hex files onto it using avrdude, regardless of the language they were written in.

6

Thanks i'v found the good way to send the bootloader and any bin/hex/elf file.

7