Updating Klipper Firmware on a Fly-CDYv3 in USB mode

How to update the klipper firmware running on a Fly-CDYv3 in USB mode

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Configuring and installing Klipper for USB

Compile Klipper firmware for Fly-CDYv3

Tip: To read more about the KCONFIG_CONFIG option, see here

ssh to your klipper host console
cd to the klipper directory
```
cd ~/klipper
```
Run make clean
```
make clean KCONFIG_CONFIG=config.cdyv3
```

Important: If when running the above command you get this output
Using default symbol values (no 'config.cdyv3'). Configuration saved to 'config.cdyv3'
Then you need to set all the correct settings when running make menuconfig below.
Otherwise, skip to compiling klipper.

Open menuconfig

make menuconfig KCONFIG_CONFIG=config.cdyv3

Set the following settings
- [*] Enable extra low-level configuration options
- Micro-controller Architecture (STMicroelectronics STM32)
- Processor model (STM32F407)
- Bootloader offset (32KiB bootloader)
- Clock Reference (8 MHz crystal)
- Communication interface (USB (on PA11/PA12))
- USB ids
- () GPIO pins to set at micro-controller startup
  
  Klipper Menu Config USB
Quit and save the configuration
Run Make to compile the firmware
```
make KCONFIG_CONFIG=config.cdyv3 -j4
```

Flash Klipper to the Fly-CDYv3 MCU

ftp to your klipper host with an FTP client like FileZilla
- open the folder ‘~/klipper/out’.
- download klipper.bin to your PC.
place the MCU MicroSD card into a card reader and connect it to your PC.
ensure that the SD Card is formatted as Fat32. If in doubt use the SD Card Formatter.
Copy the klipper.bin file to the root of the SD card.
rename klipper.bin to firmware.bin
Eject the SD card from the PC
Insert the SD card into the Fly-CDYv3 SD card Slot.

FLy-CDYv2 SD card
Press the MCU reboot button

Fly-CDYv2 reset
Wait a few minutes
Open a putty SSH session to your klipper host and log on
run lsusb to verify the MCU has been discovered as a klipper device

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