Marlin 2.0.9.1 QQS Pro SKR V1.4 Turbo Sherpa Extruder Source Code

This is the source code to compile the firmware for the SKR V1.4 Turbo to build Marlin. 
The firmware was designed to run the following upgrade.

https://www.printables.com/model/678875-new-flsun-qqs-pro-direct-drive-including-the-sherp

I recommend getting VS Code and getting the appropriate plug ins. The original person that put together this firmware is lost in time.