Fly SHT 36 V2 Klipper configuration for CAN bus | Mellow Products Documentation

Klipper configuration on the Fly SHT-36 V2 for CAN bus

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Important: This guide assumes you have a working Klipper host installation on a Raspberry Pi or compatible device

Setup steps

Toolboard firmware

Note: The SHT36 V2 shipps with CanBoot firmware installed. You can skip to the Klipper section. This section is only needed for re-installing CanBoot

Compile CanBoot firmware

ssh to your klipper host console
Install the burning utility to your klipper host system
```
sudo apt install dfu-util -y
```

Clone the CanBoot firmware to your Klipper Host

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

From your Fluidd or Mainsail web UI Edit Moonraker.conf and add the following at the bottom to allow moonraker to manage updates to the CAN bus software.
```
[update_manager CanBoot]
type: git_repo
path: ~/CanBoot
origin: https://github.com/Arksine/CanBoot.git
is_system_service: False
```
cd to the Canboot directory
```
cd CanBoot
```
Run make clean
```
make clean
```
Open menuconfig
```
make menuconfig
```

Note: Note, SHT-36 V2 units shipped before 2022-10-18 will use the GD32F103 CPU, later shipments will use the APM32F072 CPU

Set the following settings for the APM32F072 CPU
- Micro Controller : STMicroelectronics STM32
- Processor Model: stm32f072
- Build: 8 Kib bootloader
- Clock Ref: 8 MHz crystal
- Comm Interface - CAN bus on PB8/PB9
- Application Offset 8 Kib
- Can bus Speed: 500000
- Status LED GPIO pin: PC13
  
  STM32F072 CanBoot Menu Config CAN
Set the following settings for the GD32F103 CPU
- Micro Controller : STMicroelectronics STM32
- Processor Model: stm32f103
- Build: 8 Kib bootloader
- Clock Ref: 8 MHz crystal
- Comm Interface - CAN bus on PB8/PB9
- Application Offset 8 Kib
- Can bus Speed: 500000
- Status LED GPIO pin: PC13
  STM32F103 CanBoot Menu Config CAN
Quit and save the configuration
Run the make command to compile the firmware
```
make
```
You should now have a canboot.bin file at ~/CanBoot/out/

Burn CanBoot firmware to tool board

Install the boot jumper to the Boot0 pin and 3.3v pin as pictured.

DFU jumper location
Use a USB-C data cable to connect the SHT-36 V2 board to the klipper host, Make sure that the dfu jumper is installed before connecting the USB cable.
Run lsusb to see if the connection is successful, copy the USB ID in the blue box. Note that the board is in DFU mode.
```
lsusb
```
lsusb Results

Erase and Burn the firmware , replace 0483:df11 in the following command with the USB ID copied earlier

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

You should get a download progress bar and File downloaded successfuly when the burning is complete.

CanBoot burn complete
If the burn was sucessful remove the jumper from the Boot0 pin and power cycle the printer.
The tool board is now ready to install klipper firmware.

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