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CanBoot bootloader (optional)

Canboot is a bootloader for MCUs to be able to update/flash them via CANBUS.
With CanBoot there is no physical intervention (e.g. pressing the boot button) required to flash/update firmware to the MCUs.

This guide is tested with the following boards:

  • Mellow Fly-SHT 42 v1

This guide was verified on a Pi running MainsailOS

Download CanBoot

Clone the CanBoot repository: 

cd ~
git clone https://github.com/Arksine/CanBoot
To add CanBoot to your moonraker update manager, add this section to your config (optional):
moonraker.conf
[update_manager canboot]
type: git_repo
origin: https://github.com/Arksine/CanBoot.git
path: ~/CanBoot
is_system_service: False

Configure CanBoot

Open the config dialog with the following commands: 

cd ~/CanBoot
make menuconfig
and use following config settings:

  • Micro-controller Architecture: STMicroelectronics STM32
  • Processor model: STM32F072
  • Build CanBoot deployment application: Do not build
  • Clock Reference: 8 MHz crystal
  • Communication interface: CAN bus (on PB8/PB9)
  • Application start offset: 8KiB offset
  • CAN bus speed: 500000
  • Support bootloader entry on rapid double click of reset button: check (optional but recommend)
  • Enable Status LED: check
  • Status LED GPIO Pin: !PC13

this should then look like this:

CanBoot config

CanBoot config for Mellow FLY-SHT devices

use q for exit and y for save these settings.

These lines just clear the cache and compile the CanBoot bootloader: 

make clean
make

Flash CanBoot

First, you have to put the board into DFU mode. To do this, plug in a jumper to the following pins and then plug in the usb cable: Boot jumper position

With the command dfu-util -l, you can check if the board is in DFU mode. If dfu-util can discover a board in DFU mode it should then look like this: dfu-util -l If this is not the case, repeat the boot/restart process and test it again.

If your board is in DFU mode, you can flash CanBoot with the following command: 

dfu-util -a 0 -D ~/CanBoot/out/canboot.bin -s 0x08000000:mass-erase:force
dfu-util -l Now remove the jumper and unplug & plug-in the USB cable again. If the board is in CanBoot mode, the LED should blink.