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EBB36 & 42 CAN V1.0

Hardware

• MCU: ARM Cortex-M0 STM32F072C8T6 48MHz with CAN bus
• Stepper Dirver: Onboard TMC2209 in UART mode, UART address: 00, Rsense: 0.11R
• Onboard Accelerometer Sensor: ADXL345
• Onboard Temperature IC: Max31865 Select 2 / 4 lines PT100 / PT1000 by DIP switch (no Max31865 verson have not this feature)
• Input Voltage: DC12V-DC24V 6A
• Logic Voltage: DC 3.3V
• Heating Interface: Hotend (E0), maximum output current: 5A
• Fan Interfaces: two CNC fans (FAN0, FAN1)
• Maximum Output Current of Fan Interface: 1A, Peak Value 1.5A
• Expansion Interfaces: EndStop, I2C, Probe, RGB, PT100/PT1000, USB interface, CAN Interface
• Temperature Sensor Interface Optional: 1 Channel 100K NTC or PT1000(TH0), 1 Channel PT100/PT1000
• USB Communication Interface: USB-Type-C
• DC 5V Maximum Output Current: 1A

Firmware

• Only supports Klipper at the present.

Pinout

• EBB36 CAN V1.0
  
  
• EBB42 CAN V1.0
  
  

Build Firmware Image

1. Precompiled firmware(The source code version used is Commits on May 18, 2022)

   • firmware_USB.bin Use USB to communicate with raspberry pi.
   • firmware_canbus.bin Use CAN bus to communicate with raspberry pi, baudrate = 250K.

2. Build your own firmware
   

   1. Refer to klipper's official installation to download klipper source code to raspberry pi

   2. Building the micro-controller with the configuration shown below.

      • [*] Enable extra low-level configuration options
      • Micro-controller Architecture = STMicroelectronics STM32
      • Processor model = STM32F072
      • Bootloader offset = No bootloader
      • Clock Reference = 8 MHz crystal
      • IF USE USB
        • Communication interface = USB (on PA11/PA12)
      • ElSE IF USE CAN bus
        • Communication interface = CAN bus (on PB8/PB9)

      
      

   3. Once the configuration is selected, press q to exit, and "Yes" when asked to save the configuration.

   4. Run the command make

   5. The klipper.bin file will be generated in the folder home/pi/kliiper/out when the make command completed. And you can use the windows computer under the same LAN as raspberry pi to copy klipper.bin from raspberry pi to the computer with pscp command in the CMD terminal. such as pscp -C [email protected]:/home/pi/klipper/out/klipper.bin c:\klipper.bin(The terminal may prompt that The server's host key is not cached and ask Store key in cache?((y/n), Please type y to store. And then it will ask for a password, please type the default password raspberry for raspberry pi)

board.cfg files

• sample-bigtreetech-ebb-canbus-v1.0.cfg includes all the correct pinout for EBB36 & 42 CAN V1.0

EBB36 & 42 CAN V1.1

Hardware

• MCU: ARM Cortex-M0+ STM32G0B1CBT6 64MHz whit FDCAN bus
• All other parameters are the same as EBB36 & 42 CAN V1.0

Firmware

• Only supports Klipper at the present.

Pinout

• EBB36 CAN V1.1
  
  
• EBB42 CAN V1.1
  
  

Build Firmware Image

1. Precompiled firmware(The source code version used is Commits on May 18, 2022)

   • firmware_USB.bin Use USB to communicate with raspberry pi.
   • firmware_canbus.bin Use CAN bus to communicate with raspberry pi, baudrate = 250K.

2. Build your own firmware
   Note: Only after STM32G0B1 CAN PR is merged into the main branch of Klipper, will the official firmware support the CAN bus feature of STM32G0B1. If you use CANBus communication, you can use the firmware_canbus.bin compiled by us on our GitHub, or use our source code to compile it yourself: https://github.com/bigtreetech/klipper/tree/stm32g0b1-canbus
   

   1. Refer to klipper's official installation to download klipper source code to raspberry pi

   2. Building the micro-controller with the configuration shown below.

      • [*] Enable extra low-level configuration options
      • Micro-controller Architecture = STMicroelectronics STM32
      • Processor model = STM32G0B1
      • Bootloader offset = No bootloader
      • Clock Reference = 8 MHz crystal
      • IF USE USB
        • Communication interface = USB (on PA11/PA12)
      • ElSE IF USE CAN bus
        • Communication interface = CAN bus (on PB0/PB1)

      
      

   3. Once the configuration is selected, press q to exit, and "Yes" when asked to save the configuration.

   4. Run the command make

   5. The klipper.bin file will be generated in the folder home/pi/kliiper/out when the make command completed. And you can use the windows computer under the same LAN as raspberry pi to copy klipper.bin from raspberry pi to the computer with pscp command in the CMD terminal. such as pscp -C [email protected]:/home/pi/klipper/out/klipper.bin c:\klipper.bin(The terminal may prompt that The server's host key is not cached and ask Store key in cache?((y/n), Please type y to store. And then it will ask for a password, please type the default password raspberry for raspberry pi)

board.cfg files

• sample-bigtreetech-ebb-canbus-v1.1.cfg includes all the correct pinout for EBB CAN 36&42 V1.1

EBB36 & 42 CAN V1.2

V1.2 compared with v1.1: only the IO of hotend is changed from PA2 to PB13

board.cfg files

• sample-bigtreetech-ebb-canbus-v1.2.cfg includes all the correct pinout for EBB CAN 36&42 V1.2

Firmware update

Warning:

(Only for EBB 36/42 CAN V1.1)
STM32G0B1CB needs to jump to the System memory area to run bootloader (written by STMicroelectronics) when using DFU to update firmware through the Type-C port. Referring to the description in manual AN2606, The initialization process of this bootloader is shown in the following figure:

The IO of USART will be configured before going to the USB DFU mode.
After going to DFU mode, PA2 will be configured to output high level by bootloader in System memory area refer to the datasheet of STM32G0B1CB

PA2 is used for the hotend MOSFET in EBB36 & 42 CAN V1.1, The high level in the DFU mode change the hotend into heating state. Therefore, please pay attention to disconnect the main power VIN of the hotend when using the DFU of Type-C port to update the firmware, or ensure that the firmware update is completed soon and goto the normal working mode. Never keep MCU in DFU mode for a long time when the main power supply and hotend are connected.

Note

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Purchase link:

https://www.biqu.equipment/products/bigtreetech-ebb-36-42-can-bus-for-connecting-klipper-expansion-device