5. Canbus

Create the CAN0 interface file

sudo nano /etc/network/interfaces.d/can0

Enter the following

auto can0 iface can0 can static bitrate 500000 up ifconfig $IFACE txqueuelen 256 pre-up ip link set can0 type can bitrate 500000 pre-up ip link set can0 txqueuelen 256

Exit and save the file with CTRL + SHIFT X > Yes

Sudo Reboot

The CAN board needs a bootloader so we can flash the Klipper firmware. We will use CanBoot. Download the CanBoot repository:

git clone https://github.com/Arksine/CanBoot

cd CanBoot

make clean

make menuconfig

Micro-controller Architecture > (STMicroelectronics STM32)

Processer model > STM32F072

Build CanBoot Deployment Application > (Do not build)

Bootloader offset > (8KiB bootloader)

Clock Reference > (8 MHz)

(500000) CAN bus speed

Communication interface > (CAN bus (on PB8/PB9))

Micro-controller Architecture > (STMicroelectronics STM32)

Processer model > STM32G0B1

Build CanBoot Deployment Application > (Do not build)

Clock Reference > (8 MHz)

Communication interface > (CAN bus (on PB0/PB1))

Application start offset > (8KiB offset)

(500000) CAN bus speed

Add the 5v jumper. Connect the USB-C from the Pi to the EBB36 board.

Put the EBB36 into DFU mode

Press and hold the RESET + BOOT button. Release the RESET button while holding the BOOT button, than release the BOOT button.

Get the device ID of the board after it's in DFU mode

Before DFU mode

In DFU mode

Erase and flash the firmware

sudo dfu-util -a 0 -D ~/CanBoot/out/canboot.bin --dfuse-address 0x08000000:force:mass-erase:leave -d DEVICE:ID

Power off the system. Plug in the 4 wire CAN cable from the UT0C to the EBB36, and power on the the printer and RPI.

After the system is powered up verify the CAN network is up.

cd klipper

python3 lib/canboot/flash_can.py -q

You should see 1 entry for application CanBoot. Note your UUID.

Run

cd ~/klipper

make menuconfig

Select the following

Enable extra low-level configuration

Micro-controller Architecture > (STMicroelectronics STM32)

Processer model > STM32F072

Bootloader offset > (8KiB bootloader)

continued:

Clock Reference > (8 MHz)

(500000) CAN bus speed

Save the configuration pressing ESC > Yes

Run

make clean

make

Micro-controller Architecture > (STMicroelectronics STM32)

Processer model > STM32G0B1

Bootloader offset > (8KiB bootloader)

Clock Reference > (8 MHz)

Communication interface > (CAN bus (on PB0/PB1))

(500000) CAN bus speed

flash the EBB36 with the newly compiled firmware

python3 ~/CanBoot/scripts/flash_can.py -i can0 -f ~/klipper/out/klipper.bin -u 9fd4db4bdbc0

sudo dfu-util -a 0 -d 0483:df11 --dfuse-address 0x08000000 -D ~/CanBoot/out/canboot.bin

If all goes well your CAN board should now be flashed

run

~/klippy-env/bin/python ~/klipper/scripts/canbus_query.py can0

Load the provided files to the printer and press FIRMWARE_RESTART

Checking the Machine tab you should see the 4 systems