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Step 1. Followed the instructions in the Arduino_STM wiki: https://github.com/rogerclarkmelbourne/Arduino_STM32/wiki/Installation
Step 2. Unzip <L3D_CubePixel.zip> and <beta-cube-library.zip> and put these two libraries under arduino library folder ....\arduino-1.6.5-r5-windows\arduino-1.6.5-r5\libraries
Step 3. Restart Arduino IDE, then select Maple (Rev3) for programming. **If you can not find Maple(Rev3) on the board menu, replace the Arduino_STM32 folder with this one https://github.com/rogerclarkmelbourne/Arduino_STM32
**Enclosed two Demos x6CubeDemo.zip and x6CubeMusicPack.zip for reference, enjoy!
The Schematic and PCB source files can be open with Eagle PCB.
Enclosed some screenshot for Arauino IDE setting up for reference as well