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xjackal



Joined: 29 Oct 2005
Posts: 4

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functions
PostPosted: Sat Oct 29, 2005 9:39 am     Reply with quote
guys sorry for these starter questions but i couldnt understand what is
while(TRUE){ stament does.does it work while one of the conditions are "true" or how?
and i cant understand example like !--> while(!input(PIN_BO));
does this mean when NOT ?but is it low or high?
thnx
jecottrell



Joined: 16 Jan 2005
Posts: 559
Location: Tucson, AZ

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PostPosted: Sat Oct 29, 2005 9:52 am     Reply with quote
The main() function is the function that is run when the PIC starts. Normally, in the main() is a while(TRUE) statement. TRUE is #defined as 1 previously in the code somewhere. So.... The while(TRUE) statement will repeat over and over.

Code:

main() {

startup stuff

   while(TRUE) {

   repetitive stuff here

   }

}


The input(PIN_B0) statement reads the B0 pin. So..... while(!input(PIN_B0)) will repeat while PIN_B0 is low or 0 or FALSE... any way you want to describe it.


Good luck,

John
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Oct 29, 2005 9:56 am     Reply with quote
You should be looking at C tutorials on the net:
http://etude.uwaterloo.ca/~ctrudeau/lessons/C++/tutorial1.html#loop

http://www.lysator.liu.se/c/bwk-tutor.html#while
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