quaternion output question about bmf055 bsxlite example

[blues]

hi,i read the bsxlite example of bmf055.and i want to know what is the specific quaternion.and i see abnormal data from terminal window .

4 17 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 56 161 8 233 26 246 246 174 0 0 0 0 0 0 4 126 0 0 0 0 0 0 3 0 0

i can not understand  the data ,especially 246 174.

i know  the code converts a float  quaternion to a 16-bit integer regarding the scaling factor which is 16393.

but when i use [(246-128)*256+174 ]/16393to get quaternion, i find the value exceeds 1.

can you tell me why ?

[Vincent · Accepted solution]

The data is actually in signed 16 bit and scaled to the full scale, and is in the little endian format.

Dec array : 56 161 8 233 26 246 246 174

Hex array: 38 A1 08 E9 1A F6 F6 AE

Hex combined: A138 E908 F61A AEF6

Dec combined: -24264 -5880 -2534 -20746

Scaled quaternion approx: -0.7404 -0.1794 -0.0077 -0.6331

Values read are plausible.