Corrections, report format, button codes

[xiota]

I have an MR20. Mine produces 0x8099 for power and 0x8000 for channel up.

This is what I have for the report format.

    0:     u8,    Report ID (0xFD)
    1:     unknown
    2:     u8,    Counter
    3:     u8,    Battery?
    4:     unknown
    5-6:   s16be, Gyro X (Pitch)
    7-8:   s16be, Gyro Y (Roll)
    9-10:  s16be, Gyro Z (Yaw)
    11-12: s16be, Accel X (Right)
    13-14: s16be, Accel Y (Back)
    15-16: s16be, Accel Z (Top)
    17-18: u16be, Button code
    19:    s8,    Wheel delta

[1] doesn't appear to be tied to the counter. It changes within a small range, but not consistently (not counter-like), and not correlated with movement or button presses.

[3] is correlated with battery level.