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February 24th, 2018, 12:59 AM  #1 
Member Joined: Jan 2016 From: Uk Posts: 80 Thanks: 2  Twos complement on a computer
Hi, I am making a PCB project using a Compass module, and a computer program. I am now getting results, of 2x BYTEs HB and LB. The data sheet explains that the two bytes are in 'twos complement' form. I now need to program the result from these two BYTEs. If anyone has maths and computer skills, would they they let me know how to do this please? Thanks, Camerart. 
February 24th, 2018, 06:20 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 19,527 Thanks: 1750 
Are the bytes individually in that form, or are they to be considered together as a single value in that form?

February 25th, 2018, 11:36 PM  #3 
Senior Member Joined: Apr 2014 From: UK Posts: 883 Thanks: 323 
It depends what you want the result to look like. If you just want a positive number between 0 and 65535, just add 32768, assuming the 2 bytes are a single number. What module is it? 

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complement, compliment, computer, twos 
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