How do I take a HEX value from -255 to 255 and convert it to a byte from 0 to 255 with another bit of 0 or -1 for the sign? so HEX 81 (-127) is 127 with a sign of 1 and HEX 7F (+127) is 127 with a sign of 0.
Thanks
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How do I take a HEX value from -255 to 255 and convert it to a byte from 0 to 255 with another bit of 0 or -1 for the sign? so HEX 81 (-127) is 127 with a sign of 1 and HEX 7F (+127) is 127 with a sign of 0.
Thanks
What version of PBP are you using?Quote:
Originally Posted by cpayne
Google 'Two's Complement arithmetic'
I think its 2.50A PBPro
If you're using 2.50A, and an 18F, then you can use LONG's, which will handle signed integers, both in the math and in the display.Quote:
Originally Posted by cpayne
But you want to take a -255 to 255, with a range of 512 integer values, and fit that into a byte value, which has a range of 0 to 255, a total of 256 integer values.
Do you want to lose that 'resolution'? Or do you actually mean something else?
I'm unsure of how you wish to implement the data, so I may be out of line here.Quote:
Originally Posted by cpayne
But have you considered using an offset? Consider 127 to be 0, then manipulate the numbers from there. Negative values are 127-x; positive values (i.e., if x>127) are x-127.