I am communicating with a roomba. It sends certain int-sized values (-32768 - 32767), two bytes at a time, high byte first. I am having trouble keeping the value signed when I receive it, and put the two bytes into an int variable using bit math. At the top of my code, I declare 'distance' as an int…

Casting a negative value??

system July 29, 2009, 9:37am 9

A union is not ideal, I think, if there is different endianness.
The shift-OR approach is probably preferable from a portability POV.

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