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

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Ben 2015-6-12

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https://ww2.mathworks.cn/matlabcentral/answers/223496-converting-16-bit-little-endian-2-s-complement-integer-to-regular-integer

评论： Walter Roberson 2015-6-14

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:

247

255

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

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Answer 1

Walter Roberson 2015-6-12

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https://ww2.mathworks.cn/matlabcentral/answers/223496-converting-16-bit-little-endian-2-s-complement-integer-to-regular-integer#answer_182416

swapbytes(typecast(TheByteVector, 'int16'))

TheByteVector should be uint8.

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Ben 2015-6-13

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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(packet.data(1:2))),'int16')))*0.0610352;

This is used multiple times for different values. The input packet.data is a double. If there's a cleaner/quicker/more efficient way to do what I'm doing, please share, thanks.