I have written a subroutine that simultaneously calculates the sine
and cosine of an angle. The calculations are in 16 bit signed fixed
point. The results are accurate to about 1 or 2 LSB. It should run on
all PICs - it uses only shifts, adds and subtracts. You can get it
from http://www.nfra.nl/~mgoris/misc.html

Mal Goris
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http://www.nfra.nl/~mgoris/