Pic 18F assembly with GUI problem

EDAboard.com Forum Index -> Microcontrollers -> Pic 18F assembly with GUI problem

Author

Message

Raju C

Joined: 17 Sep 2009
Posts: 43
Location: Bangalore

04 Nov 2009 3:58 Pic 18F assembly with GUI problem

Hi all...
If i enter the frequency through GUI(graphical user interface) and with that frequency i want to calculate some other value that i am going to use in my code .
ex: i am entering frequency 400.125MHz and band width=25kHz
so i need to calculate N value
i.e N = 400.125MHz/25kHz
= 16005 = 3E85(hex)
so each time entering different frequency it has to calculate N value. is that in the code the first step i can take which divides that frequency?? and how can i divide this ?
pls help anyone..

btbass

Joined: 20 Jul 2001
Posts: 1187
Helped: 113
Location: Oberon

04 Nov 2009 8:28 Re: Pic 18F assembly with GUI problem

You need a floating point maths library for the Pic. If you search with google you will find a lot of them on the web.
Floating point math will take a large chunk of your memory.
This would be a lot easier if you used C programming language.

atferrari

Joined: 29 Jun 2004
Posts: 207
Helped: 3
Location: Buenos Aires - Argentina

04 Nov 2009 8:50 Pic 18F assembly with GUI problem

"Easier" is arguable but not the point here, anyway.

I am sure that it is also going to take a lot of space in memory. Nothing is for free.

JUst another comment: before resorting to floating point maths, make sure that you actually need them. Maybe, you can go away with fixed point maths.

Google
AdSense
Google Adsense

04 Nov 2009 8:50 Ads

Raju C

Joined: 17 Sep 2009
Posts: 43
Location: Bangalore

04 Nov 2009 9:05 Pic 18F assembly with GUI problem

ya it will take lot of space thats why i want to put it in a single formula kind thing.. just i enter the frequency in GUI .. In my code i need to calculate N value.. so anyway bandwidth is fixed so i wll store it and whenever i enter frequency it should divide by BW so.. is their any option to do this??