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Detecting #use fast_io

 
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object01



Joined: 13 May 2004
Posts: 90
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Detecting #use fast_io
PostPosted: Tue Dec 21, 2004 9:52 am     Reply with quote
I've recently been frustrated by the output_*() functions only accepting constants as parameters. I'm trying to build a multi-mode driver that handles a variable number of FLASH RAMs on SPI, configurable at compile-time, and selecting/deselecting chip-select lines is a little tedious now. So I thought about writing my own output_functions that do the same thing, but I need to be able to detect whether #use fast_io is in effect. I didn't see anything for detecting this using getenv(). Is there a way?

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Jeff S.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Dec 21, 2004 10:36 am     Reply with quote
Quote:
I've recently been frustrated by the output_*() functions only
accepting constants as parameters

See this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=18480
Quote:
but I need to be able to detect whether #use fast_io is in effect.

Something like this would probably work. If you don't want to use
fast_io, then comment out the #define statement.

Code:
#include <16F877.h>
#fuses XT, NOWDT, PUT, BROWNOUT, NOLVP
#use delay(clock=4000000)

#define USE_FAST_IO_B  1

#ifdef USE_FAST_IO_B
  #use fast_io(B)
#endif

void main()
{


#ifdef USE_FAST_IO_B
// Put your code here.
#endif

}
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