From mathieu....@gmail.com on September 26, 2012 08:44:13

acc_x/acc_y/acc_z/gyro values are in [0..1023].

acc_x does not seems to be centered.
The real center seems to be near 628.

Maybe there are extra bytes in the report that tell what's the center.
There are a few unknown bytes just before the motion sensing value.

For example:
buf[36] = 0x02
buf[37] = 0x77
0x277 = 631 (quite close to 628...)

Further tests need to be done.

Original issue: http://code.google.com/p/diyps3controller/issues/detail?id=190