Flaoting to Integer conversion

[Juganoo]

Hello All,

I have timer interrupt routine wherein I need to do some floating point operation. There is no floating point processor in system. It is basically an embedded system.

If I do floating point operation in interrupt routine, it is heavy overhead for processor.

Can I do same operation but with similar accuracy using integers?

Please advise..
Juganoo

[ggs]

You might try fixed point numbers.

What you do, is you set aside a number of binary digits in an integer for the decimal point accuracy. ie:

32 16 8 4 1 | decimal point | 1/2 1/4 1/8 1/16 1/32

Addition and subtraction of fixed point numbers are just the same as that for regular integers. When you divide a fixed point number by another, multiply it by `1' (whatever that is in your system). When you multiply a fixed point number by another, divide it by `1' (again, what it is in your system.) It's great, because both of those operations are bitshifts.. You might try google or programmersheaven to get more help with this.

[moi]

see my sig for an example of fixed point arithmetic instead of floating point to compute a pwetty mandelbwot fwactal

[ggs]

bill cosby?

[moi]

Originally posted by ggs
bill cosby?

??????

[ggs]

bleh. I saw that _very_ program posted on another board, I SWEAR. but it made a fractal out of ``bill cosby''. Are you stealing SORES from somewhere..?

[moi]

i can assure you 105% that this program is an original creation by me. just because you saw another program that was a whole bunch of code smashed into four lines doesnt mean much

[ggs]

well, a few more similarities than that (ie, output... ;O) but on second look yes, the code is very different shocking, that... 105%, you say? whee

lor~, i apologize for teh outburst

[moi]

Originally posted by ggs
well, a few more similarities than that (ie, output... ;O) but on second look yes, the code is very different shocking, that... 105%, you say? whee

well, the fractal is a "standard", that many people can code in their sleep.

[Juganoo]

MOI , can you explain me, how it works??/

Jgnoo

[moi]

uggggggg............

you start out with a sane looking program, replace all the variables with single letters, optimize your code as much as possible for terseness, remove all whitespace, and voila. its really not all that amazing