BIG TREE TECH U2C User manual
BIGTREETECH
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BIGTREETECH
U2C
User Manual
BIGTREETECH
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Contents
Contents.....................................................................2
Revision History .............................................................3
1. Product Introduction......................................................4
1.1 Product Features......................................................4
1.2 Product Dimensions...................................................4
2. Peripheral Interface .......................................................5
2.1 Interface Description ..................................................5
2.2 USB-A Port ...........................................................6
3. Optional Wiring Diagram ..................................................7
5. Firmware Description ....................................................10
5.1 Firmware Source Code ...............................................10
5.2 Firmware Update.....................................................10
5.3 Klipper Configuration ................................................10
6. Precautions...............................................................11
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Revision History
Version
Revision Description
Date
01.00
First Draft
2022/04/23
01.01
Add the hardware setting of 2*USB-A port to
communicate with the motherboard using CAN
bus (e.g. USB port of Octopus)
2022/05/27
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1. Product Introduction
BIGTREETECH U2C is a USB to CAN bus module, which can convert the USB
port of Raspberry Pi to the CAN bus, and connect 3D printing motherboard,
BIGTREETECH EBB35/36/42 CAN and other products through CAN bus. There
are many different forms of CAN interfaces on the board, which are helpful to
connect to different boards.
CAN bus has many advantages in the field of industrial control, so our company
has launched this USB to CAN module. The CAN bus has a long transmission
distance, and a large number of nodes can be mounted on it, so the motherboard,
EBB, and other expansion boards can be mounted on the same CAN bus at the
same time.
1.1 Product Features
1. Support CAN bus connection, long data transmission, strong anti-noise ability,
strong real-time performance and high reliability.
2. The surface of the PCB adopts the ENIG process.
3. The TYPE-C port is equipped with ESD protection to prevent static electricity
from damaging the hardware.
4. Support firmware update for the motherboard through SWD or hardware
DFU.
5. More than on CAN interface.
1.2 Product Dimensions
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2. Peripheral Interface
2.1 Interface Description
CAN_IN: USB to CAN interface for connecting to Raspberry Pi.
CAN_OUT*: It is used to connect an interface without CAN transceiver but with
CAN function, such as connecting to the USB port of the motherboard, where the
pin connecting the USB port of the motherboard to the main controller must have
CAN function. E. g.:
CAN_OUT: Used to connect BIGTREETECH EBB CAN or other boards with CAN
transceivers.
Power: Power Supply.
CAN_OUT
Power
CAN_OUT*
CAN_IN
BIGTREETECH U2C 1.1
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2.2 USB-A Port
U2C v1.1 has 2 more "CAN transceiver + USB-A" than v1.0, which makes it
convenient to connect the motherboard directly with USB data cable.
NOTE：
1. USB GPIO of the motherboard needs to support CAN
feature(e.g."PA11/PA12" of Octopus)
2. The signal protocol on the USB data cable of this connection mode is still the
TTL level signal of MCU rather than the differential signal of CAN, so the anti-
interference ability is not strong. Please avoid using too long data cable and avoid
being close to places with strong signal interference.
The jumper of the Vbus in the figure is the power supply jumper of the CAN
transceiver. When the USB of the motherboard cannot provide 5V power supply
to U2C in reverse (e.g. Octopus), it is necessary to insert the jumper of the Vbus
to use the 5V of U2C to supply power to the can transceiver. Vbus-1 corresponds
to the lower USB-A port, and Vbus-2 corresponds to the upper USB-A port. The
jumping of 120R corresponds to the terminal resistance of two CAN transceivers
respectively.
Vbus-1
120R-1
Vbus-2
120R-2
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3. Optional Wiring Diagram
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4. Product Display
BIGTREETECH U2C 1.1
BIGTREETECH U2C 1.0
BIGTREETECH U2C 1.1
BIGTREETECH
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BIGTREETECH U2C 1.0
BOTTOM
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5. Firmware Description
5.1 Firmware Source Code
We use the open source CandleLight firmware:
https://github.com/candle-usb/candleLight_fw
MCU Model: STM32F072C8
5.2 Firmware Update
After the module is completely powered off, press and hold the Boot button, plug
the Type-C data cable to power the module, enter the DFU mode, and use the
STM32CubeProgrammer software to update the firmware.
5.3 Klipper Configuration
Firmware Configuration Reference: https://www.klipper3d.org/CANBUS.html
1. Enter command in ssh terminal sudo nano /etc/network/interfaces.d/can0 and
execute
auto can0
iface can0 can static
bitrate 250000
up ifconfig $IFACE txqueuelen 1024
Set the CANBus speed to 250K (Customizable, but must be the same as the
speed set in the firmware CAN bus speed), save after modification (Ctrl + S) and
exit (Ctrl + X), enter sudo reboot to restart the Raspberry Pi.
2. Every device on CANBus generates a canbus_uuid based on the MCU's UID,
to find each microcontroller device ID, make sure the hardware is powered on
and wired correctly, then run:
~/klippy-env/bin/python ~/klipper/scripts/canbus_query.py can0
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