Conversion to degrees help

[Archangel]

This might get you 2 behind the point...

scale = 1024
dummy = position << 6'wont overflow 16 bits, same as *64 but quicker
dummy = dummy * 360 'will overflow 16 bits
result_high = div32 scale 'but doesnt matter here
degrees_whole = result_high >> 6 'same as divide by 64 but quicker

scale = 1024
dummy = position << 6 'wont overflow 16 bits, same as *64 but quicker
dummy = dummy * 36000 'will overflow 16 bits
result_low = div32 scale 'again, doesnt matter here
degrees_fraction = result_low >> 6 'same as divide by 64 but quicker
degrees_fraction = degrees_fraction // 100 'take out the -whole- degrees and leave the fraction

lcdout $fe , 1 , "Degrees:" , DEC3 degrees_whole , ":" , DEC2 degrees_fraction

This should work for a 10 bit ADC, but for a 12 bit ADC, the 2nd chunk will overflow. Changing the 36000 to 3600 and 100 to 10 should let the 2nd chunk work with one digit behind the decimal point, or change 36000 to 9000 and 100 to 25 and you'll get 2 digits behind the decimal point but in steps of .04

And upgrade to PBP 2.50b

All this math makes my head hurt , couldn't you do the math twice with different multipliers, throw out the top numbers from one, and the bottom numbers from the other and display the results together separated by the decimal point ? Or is that what you just said?

[skimask]

All this math makes my head hurt , couldn't you do the math twice with different multipliers, throw out the top numbers from one, and the bottom numbers from the other and display the results together separated by the decimal point ? Or is that what you just said?

You could do what you suggested, but I split it up to display the math involved a bit more clearly...
If I was me as I usually am, I would've put something like this instead:

dummy=(position<<8)*90:result_high=div32 1024:degrees_whole = result_high >> 6
dummy=(position<<8)*9000:result_low=div32 1024:degrees_fraction=(result_low>>6)//100
lcdout $fe,1,"Degrees:",DEC3 degrees_whole,":",DEC2 degrees_fraction