added spider flashing instructions

Manuals/MCU_Firmware/Readme.md

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+# SPIDER V2.2 MCU FW INSTALL/UPDATE
+
+The firmware installation process for the Fysetc Spider MCU
+
+## Prerequisites:
+
+- Klipper must be installed onto the Raspberry Pi
+- Take two blue jumpers out of the Fysetc Spider box
+- You should have physical access to the MCU
+- Voron Design recommends using USB to control the Spider, which simply requires connecting a USB-A to USB-C cable between the Spider and Pi. If you prefer a UART connection, please consult the fysetc documentation for the necessary configuration adjustments.
+
+
+# 1. Enter DFU Mode
+
+1.  First power off the board
+
+2. Set jumper on 5v pin and DC5V 
+![](Images\5vJumper.png)
+3. Place jumper on BT0 to 3.3V pin 
+![](Images\boot.png)
+4. Connect USB cable to the board and RPI
+
+5. Power up the board with 24v
+
+
+# 2. Build Firmware Image
+
+- Login to the Raspberry Pi via ssh
+    ```
+    username: pi
+    pass: raspberry
+    ```
+- Run the following:
+    ```
+    sudo apt install make
+    cd ~/klipper
+    make clean
+    make menuconfig
+    ```
+- In the menu structure there are a number of items to be selected.
+    - Select “Enable extra low-level configuration options”
+    - Set the micro-controller architecture is set to STMicroelectronics STM32
+    - Set the Processor model to STM32F446
+    - Set the Bootloader offset to 32KiB bootloader
+    - If your Spider was made prior to 2021/06/23, set the Bootloader offset to 64KiB bootloader
+    - Set the Clock Reference to 12 MHz crystal
+    - Set the Communication interface to USB (on PA11/PA12) (note: see Fysetc documentation if you intend to use UART rather than USB)
+![](Images\spider_klipper_menuconfig.png)
+
+- Once the configuration is selected, press ```q``` to exit, and ```“Yes”``` when asked to save the configuration.
+
+- Run the command
+    ```
+    make
+    ```
+
+- The make command, when completed, creates a firmware file klipper.bin which is stored in the folder /home/pi/klipper/out.
+
+# 3. Firmware Installation
+
+- From your ssh session, run 
+    ```
+    lsusb
+    ```
+    and find the ID of the DFU device.
+- Run command below replacing 1234:5678 with the ID from the previous step 
+    ```
+    make flash FLASH_DEVICE=1234:5678
+    ```
+
+
+# 4. Exit DFU Mode
+
+- Power off the Spider
+- Remove the jumper from BT0/3.3V
+- Power up the Spider
+- You can confirm that the flash was successful by running
+    ```
+    ls /dev/serial/by-id
+    ```
+If the flash was successful, this should now show a klipper device, similar to:
+![](Images\stm32f446_id.png)
+
+
+
+
+# Sources:
+https://docs.vorondesign.com/build/software/spider_klipper.html
+https://wiki.fysetc.com/Spider/