Suitable for Puzhong V2 board
/*
- D7 D8 discarded
- 1111 1111
- 1110 1110
- 1110 1011
- 1111 0101
- 1101 1101
- 0~25 seconds D5 is on, D1 is on, D3 is not on 0xee
- 25~30 seconds D5 is on, D1 is not on, D3 is on, 0xeb
- 30~55 seconds D2 is on, D4 is on, D6 is off, 0xf5
- 55~60 seconds D2 is on, D4 is not on, D6 is on, 0xdd
- Loop~
- Digital tube display countdown time
- Each of the 8 digital tubes has two directions: east, west, south, north
- 0~25 seconds
- 25~30 seconds
- 30~55 seconds
- 55~60 seconds
- 1111 1111
- 1110 1101 0xed
- 1110 1110 0xee
- 1111 0101 0xf5
- After the button k1 is pressed, d2 and d5 will light up, and the time will not stop. Press k1 again to return to normal.
- After the button k2 is pressed, d1 and d5 will light up and the time will not go after a pause. Press the k2 button again to return to normal.
- After the button k3 is pressed, d4 and d2 will light up, and the time will not go after a pause. Press the k3 button again to return to normal
*/
