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MMB CAN V1.0

Product Profile

BIGTREETECH MMB CAN V1.0 is a control board for multi-material 3D printing system, e.g., ERCF. It simplifies wiring by communicating via USB or CAN.

Product Link: https://biqu.equipment/products/bigtreetech-mmb

Features Highlights

  • The board has BOOT and RESET buttons, allowing users to update firmware in DFU mode via USB.
  • I2C interface reserved for filament run out/clogging detection, or other DIY functions.
  • The power interface has reverse polarity protection to prevent the board from being damaged if power cables are connected incorrectly during DIY.
  • Supports CAN or USB communication, with selectable 120R terminal resistance for CAN and reserved CAN expansion interface.
  • USB port has ESD protection to prevent controller damage from electrostatic discharge.
  • Uses XT30 interface for CAN communication and board power supply, simplifying wiring.
  • Stepper motor driver supports high and low voltage selection for DIY use.

Specifications

Dimensions 125mm x 54mm
Installation size Refer to BIGTREETECH MMB CAN V1.0-SIZE.pdf
Microprocessor ARM Cortex-M0+ STM32G0B1CBT6 64MHz
Input Voltage DC12V-DC24V 9A
Logic Voltage DC 3.3V
Servo Interface (MOT) Maximum Output 5V 2A, peak 2.5A
Expansion Interfaces STP1-STP11, I2C, RGB, Sensor (infrared sensor interface), USB, CAN
Motor Driver Support EZ Drive (supports voltage selection)
Driver Operating Modes STEP/DIR, UART, SPI
Stepper Motor Interfaces M1, M2, M3, M4
USB Communication Interface USB Type-C
DCDC 5V Output Maximum Current 3.6A

Firmware Support

Currently, MMB CAN V1.0 only supports Klipper firmware.

Dimensions

Peripheral Interface

Pin Description

Interface Introduction

USB Power Supply

After the board is powered on, the power indicator light will turn on, indicating that the power supply is normal. The VUSB label on the board is the power selection terminal, and a jumper is needed to short VUSB only when using USB to power the board.

Servo Wiring

RGB-WS2812 Wiring

Sensor (e.g., CRT5000 infrared sensor) Wiring

I2C (e.g., AHT10 temperature and humidity sensor) Wiring

Endstop (e.g., Hall sensor) Wiring

Klipper Firmware

Flashing CANBOOT

Note: CanBoot is for updating MCU firmware directly via CAN bus. If you prefer DFU, skip this step.

To flash CanBoot on Raspberry Pi or CB1, follow the instructions at https://github.com/Arksine/CanBoot

  1. Enter

    cd ~

    Navigate to the main directory and input

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

    to download the CanBoot project. Then enter

    cd CanBoot

    navigate to the CanBoot directory.

  2. Enter

    make menuconfig

    configure as shown in the provided image:

​ 3.Enter make to compile the firmware. The resulting canboot.bin file will be in the home/biqu/CanBoot/out folder. This can be directly downloaded to your computer from the SSH software's left panel.

​ 4.Hold the Boot button and connect the board to Raspberry Pi/CB1 via Type-C cable to enter DFU mode.

​ 5.Enter lsusb in the SSH terminal to query the DFU device ID.

​ 6.Enter the following command to flash CanBoot

​ make flash FLASH_DEVICE=0483:df11

​ replacing 0483:df11 with the actual device ID found in the previous step.

​ 7.After flashing, disconnect the Type-C cable.

Compiling Klipper Firmware

​ 1.Connect to CB1/Raspberry Pi via SSH and enter the following

​ commands:

​ cd ~/klipper/

​ make menuconfig

​ Configure the firmware as shown in the provided image (update Klipper

​ firmware to the latest version if options are not available).

[*] Enable extra low-level configuration optionsMicro-controller

Micro-controller Architecture (STMicroelectronics STM32) --->

Processor model (STM32G0B1) --->

If not using CanBoot

Bootloader offset (No bootloader) --->

If CanBoot is used

Bootloader offset (8KiB bootloader) --->

If USB communication on Type-C is used

Communication interface (USB (on PA11/PA12)) --->

If CAN-Bus communication is used

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

(1000000) CAN bus speed

2.After configuration, press q to exit, and select Yes when prompted to save.

3.Enter make to compile the firmware. The resulting klipper.bin file will be in the home/pi/klipper/out folder. This can be directly downloaded to your computer from the SSH software's left panel.

Firmware Update via CANBOOT

  1. Connect the CAN bus cable and plug a jumper at the 120R terminal resistor.

  2. Enter

​ cd ~/CanBoot/scripts

​ then enter

​ python3 flash_can.py -i can0 -q

​ query the canbus ID (make sure the CAN cable is connected and powered on) as shown in the figure below, the UUID of the device has been found:

​ 3.Enter

​ python3 flash_can.py -i can0 -f ~/klipper/out/klipper.bin -u be69315a613c

​ The be69315a613c is replaced with the actual UUID. Note: klipper.binneeds to be generated in advance using the make command, and the application start offset of CanBoot is 8KiB offset, so Klipper's menuconfig Bootloader offset should also be 8KiB bootloader, as shown in the following figure.

​ 4.Query again with

​ python3 flash_can.py -i can0 -q

​ The Application should now show Klipper, indicating it is running correctly.

Firmware Update via DFU

Raspberry Pi or CB1 update via DFU.

1、Hold the Boot button and connect the board to Raspberry Pi/CB1 via Type-C cable to enter DFU mode.

2、Enter lsusb in the SSH terminal to query the DFU device ID.

3、Enter

cd klipper

navigate to the Klipper directory, and enter

make flash FLASH_DEVICE=0483:df11

start flashing the firmware (Note: Replace 0483: df11 with the actual device ID found in the previous step.)

4、After flashing, enter

ls /dev/serial/by-id/

to query the device's Serial ID (only applicable for USB communication, not for CANBus).

5、For USB communication, you don't need to press the Boot button for

subsequent updates. Enter the following command to flash the firmware

make flash FLASH_DEVICE=/dev/serial/by-id/usb-Klipper_stm32g0b1xx_4550357128922FC8-if00

(Note: replacing /dev/serial/by-id/xxx with the actual ID found in the previous step).

6、For CAN bus communication, disconnect the Type-C cable after flashing.

CAN bus Configuration

Use with BIGTREETECH U2C module.

1、Enter the following command in the SSH terminal:

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

Add the following content:

allow-hotplug can0

iface can0 can static

bitrate 1000000

up ifconfig $IFACE txqueuelen 1024

Set the CAN bus speed to 1M (must match the firmware setting of 1000000 CAN bus speed). Save (Ctrl + S) and exit (Ctrl + X), then enter sudo reboot to restart Raspberry Pi.

2、Each device on CAN bus will generate a canbus_uuid according to the UID of MCU, to find each microcontroller device ID, ensure the hardware is powered on and connected correctly, then run:

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

3、If an uninitialized CAN device is detected, the command will report the canbus_uuid:

Found canbus_uuid=0e0d81e4210c

4、If Klipper is running and connected to the device, the canbus_uuid will not be reported, which is normal.

Configuring Klipper

1、In your computer's web browser, enter the Raspberry Pi's IP address, and as shown in the path below, download the reference configuration file sample-bigtreetech-mmb-canbus.cfg. If the file is not available, update Klipper firmware to the latest version or download from:

https://github.com/bigtreetech/MMB

2、Upload the configuration file to Configuration Files.

3、Add the board configuration to the "printer.cfg" file:[include sample-bigtreetech-mmb-canbus.cfg]

4、Modify the ID number in the configuration file to match the actual ID of the board (USB serial or canbus).

5、Configure the module's specific functions according to the instructions at https://www.klipper3d.org/Overview.html

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