>> Has anyone done
>> the conversion from 4 byte real (units 1/256 seconds) to degrees, minutes
>> and seconds in a PIC
>> in assembler?
>> It would look something like
((B1*256^3)+(B2*256^2)+(B3*256)+B4)/3600)/256.
>> Would a simple
>> 16F84 be able to do that?
>>
>> Henk VK2GWK (PA0ADC)
>
>On that math, no problem on an 'F84;  what you're talking about is
>simply generating a 32-bit number from the 4 bytes B1, B2, B3, B4, then
>dividing it by 3600 and by 256.  You can start off by doing the divide
>by 256 (just shift the decimal place - B4 is now to the right of the
>decimal place) - then divide by 3600.  Scott Dattalo or someone probably
>has a better way here, of course.


Yeah. Peace of cake..  :)

1. Convert to degrees
deg = B1B2B3B4 / (3600 * 256)
You will need 32 by 24 fixed point divide routine from Application Note 617.
2. Convert residue to minutes
min = res / (60 * 256)
Same routine may be used, though 24 by 16 is enough.
5. Convert residue to seconds and "subseconds"
sec = res / 256 - higher byte of residue
ssec = res - sec * 256 - lowest byte of residue