MATLAB Answers

Converting 16-bit, little-endian, 2's complement integer to regular integer

30 views (last 30 days)
Ben on 12 Jun 2015
Commented: Walter Roberson on 14 Jun 2015
I'm trying to get various data sets (accelerometer, gyroscope etc.) from a AHRS (a CHR-UM6) and I'm having trouble getting the values out in the correct form. The data received (for each value) is a two row column vector such as:
These numbers are 16-bit, little-endian, 2's complement and I need to get the actual value. I hope someone can help!
Thanks, Ben


Sign in to comment.

Accepted Answer

Walter Roberson
Walter Roberson on 12 Jun 2015
swapbytes(typecast(TheByteVector, 'int16'))
TheByteVector should be uint8.


Ben on 13 Jun 2015
At first I didn't think this was going to work as swapbytes just seems to switch between little and big endian and I was worried about the two's complement part, but I was pleasantly surprised when my output values were what they should've been, thanks. My code is as follows, for reference:
gyro_x = double(swapbytes(typecast((uint8(,'int16')))*0.0610352;
This is used multiple times for different values. The input is a double. If there's a cleaner/quicker/more efficient way to do what I'm doing, please share, thanks.
Walter Roberson
Walter Roberson on 14 Jun 2015
gyro_x = double(typecast(uint8([2 1]),'int16')) * 0.0610352;
No need to call swapbytes if you don't need to ;-)

Sign in to comment.

More Answers (0)


Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by