USB Firmware Compilation

tip

The E3 V2 is pre-flashed with a bootloader on the TF card at the factory, so there's no need to flash it again.

Start Compilation

A host machine with the installed klipper service is required Connect via SSH over the network
Make sure the device is connected to the host machine
Note: Please use a regular host machine, such as a Raspberry Pi FLY board, etc. If it's a modified host machine (e.g., WiFi stick, Redmi, etc.), due to too many issues, we cannot provide technical support for these machines

warning

To switch from the ROOT user to a regular user, you can enter the command below
Do not use the ROOT user
For the fly user, you can directly enter: su fly. For non-fly users, please replace <your host machine username> with your host machine's username!

su <your host machine username>

::: tip

Please ensure that the host machine can connect to the network normally.
Before compiling the firmware, use SSH to log in to the host machine via the network.
Do not use a serial port tool to log in to the host machine.

:::

Klipper Firmware Compilation and Configuration Page Operation Instructions

::: tip

Please make sure that the keyboard input method is in half-width mode, i.e., English mode.

:::

The key ↑ (up arrow) and ↓ (down arrow) on the keyboard are used to move the cursor up and down to select menu items.
The confirm key Enter or spacebar Space is used to check the menu or enter a sub-menu.
The exit key ESC is used to return to the previous menu.
The Q key is used to exit the Klipper firmware configuration page.
When exiting the Klipper firmware configuration page and there is a prompt, press the Y key to save the configuration file.

::: warning

If there are fewer options in the configuration page, please first check [ ] Enable extra low-level configuration options to display some hidden options.

:::

Below is the introduction on how to compile the firmware:

After connecting to SSH, enter the following command and press Enter:

cd ~/klipper && rm -rf ~/klipper/.config && rm -rf ~/klipper/out && make menuconfig

Where rm -rf ~/klipper/.config && rm -rf ~/klipper/out is to delete previous compilation data and firmware, make menuconfig is for compiling the firmware, after execution, the following interface should appear
Select Enable extra low-level configuration options and press Enter
Enter the menu Micro-controller Architecture then select STMicroelectronics STM32 and press Enter
Enter the menu Processor model, select STM32F407 and press Enter
Select Bootloader offset, select: 32KiB bootloader
Communication interface, select: USB (on PA11/PA12)

Press the Q key, and when Save configuration appears, press the Y key.
Now the configuration should be saved and you should have exited back to the command line interface.
Enter make -j4 to start compiling, this process may take some time.
If the output ends with the following content, the compilation is successful.
```
Linking out/klipper.elf
Creating hex file out/klipper.bin
```

Firmware Burning

Preparation

Before starting to burn the firmware, please first connect via SSH using the network connection
Counterfeit memory cards may cause the burning process to fail. Please try to use the recommended memory card below for firmware updates
Prepare a TF card with a capacity of no more than 32G, and it is recommended that the transmission speed of the TF card must be class10 or higher. It is recommended to use brands such as SanDisk for the TF card

Download Firmware

Use the previously prepared TF card
Format using SDFormatter
Using MobaXterm_Personal, find klipper in the left file directory, then find out and open it
And download klipper.bin to the TF card, and rename it to firmware.bin
Power off the motherboard, insert the TF card into the motherboard
On the motherboard, wait for 10 seconds
Remove the TF card, insert it into the computer. If the firmware.bin in the SD card disappears and FLY.CUR appears, it indicates that the burning was successful