1,ctrl cmd
2 scan cmd
3,setting col gpio
4,setting row gpio
5,read current key map (if key is press,key bit is 0,)
6,read old key map
7,judge key
1,ctrl cmd
2 scan cmd
3,setting col gpio
4,setting row gpio
5,read current key map (if key is press,key bit is 0,)
6,read old key map
7,judge key