Transfer the interface of the homemade game board to the Liangshan School development board. 
Filter and stabilize the 3.3V power supply of Liangshan School, and use LED lights to indicate whether the power supply is OK. 
Use ADC to sample the joystick to achieve direction control of the game. 
Use level sampling to determine whether the key is pressed, and add key LED indication. 
Connect the LCD screen by welding FPC soft cable to achieve display function
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