Introduction - If you have any usage issues, please Google them yourself
Some 3 buttons are uploaded through the development board (KEY_UP, KEY0)
(KEY1) to control the 2 LED (DS0 and DS1) on the board, where the KEY0 controls the DS0, press it once, and then press again.
KEY1 control DS1, the effect is the same as KEY0. KEY_UP controls both DS0 and DS1 at the same time, and their status reverses once.