CandleLight_FW (U2C v1.x)

CandleLight_FW is a firmware for STM32F042x/STM32F072xB based USB-CAN adapters.

Github: github.com/candle-usb/candleLight_fw

Compile CandleLight_FW

# install requirements
sudo apt-get install cmake gcc-arm-none-eabi

cd ~
# clone git repo
git clone --depth=1 https://github.com/candle-usb/candleLight_fw
cd ~/candleLight_fw

# create cmake toolchain
mkdir build
cd build
cmake .. -DCMAKE_TOOLCHAIN_FILE=../cmake/gcc-arm-none-eabi-8-2019-q3-update.cmake

# compile firmware
make candleLight_fw

Flash CandleLight_FW

First, the adapter must boot in DFU mode. Please press the boot button and then connect the USB cable. With dfu-util -l, you can check whether the adapter is booted in DFU mode. This should look like this:

If dfu-util can discover a board in DFU mode it should then look like this:

If the BTT U2C has booted in DFU mode, you can flash it with this command:

make flash-candleLight_fw

It should then look like this:

Add can0 interface

Now you only have to create the interface in the OS. to do this, create the file /etc/network/interfaces.d/can0 and fill it with the following content.

# open file with nano
sudo nano /etc/network/interfaces.d/can0

/etc/network/interfaces.d/can0

allow-hotplug can0
iface can0 can static
    bitrate 500000
    up ifconfig $IFACE txqueuelen 128

To save and close the nano editor:
ctrl+s => save file
ctrl+x => close editor

After a reboot, the can interface should be ready.