ATmega bootloader over PJON bus.
- Using
boot.h(thanks to Optiboot) for programming functions - Using
PJON(thanks to Giovanni Blu Mitolo) for the network layer - Using
oniudra-headers(thanks to esmil/oniudra-headers) for serial debugging and helper functions - Also a big THANKS for the project arduino-netboot from wich i've learned much of how a bootloader works
The current goal is to program an ATmega328p (Arduino Nano) over PJON using SoftwareBitBang strategy.
Main problem is library size because bootloaders have a max size of about ~4000 bytes.
For this to work, you will need two Arduino Nano (one connected to the PC by USB serial, and the other is the target). The PC will send the HEX file to the first Arduino which in turn will send it over PJON bus to the bootloader.
I'm using Ubuntu 16 LTS:
- Setup the environment:
sudo apt-get install git gcc-avr binutils-avr gdb-avr avr-libc avrdude - Clone the project:
git clone https://github.com/JohnKiller/PJON-bootloader - Cd into directory:
cd PJON-bootloader - Init submodules:
git submodule update --init --recursive - Build:
chmod +x build.sh && ./build.sh - Use avr to program the generated HEX file
You also have to set the fuses BOOTSZ1, BOOTSZ0 and BOOTRST. Personally, I use L 0xFF, H 0xD0 and E 0x05 (as always, be VERY careful with fuses, you can brick the processor).
This is still in the early stages. I've already created a simple serial bootloader and it works, so now I'm focusing on getting PJON running with AVR. Any help is appreciated.