CCS :: View topic - How to check if RS232 Stream is defined

FAQ

Forum Help

Official CCS Support

Profile Log in to check your private messages Log in

CCS does not monitor this forum on a regular basis.

Please do not post bug reports on this forum. Send them to support@ccsinfo.com

How to check if RS232 Stream is defined

CCS Forum Index -> General CCS C Discussion

View previous topic :: View next topic

Author

Message

SpaceXDebris

Joined: 15 Dec 2009
Posts: 3

How to check if RS232 Stream is defined

Posted: Thu Mar 25, 2010 1:52 pm

Hey there,

This is possible:

Code:

#define FOO 1
#ifdef FOO
//Code
#endif

I'm trying to do the something similar with rs232 streams. Ideally:

Code:

#use rs232(... STREAM=COM_A)
#use rs232(... STREAM=COM_B)

//Code

#ifdef COM_A
#ifdef COM_B

// Code that only compiles when two streams are defined

#endif
#endif

#ifdef obviously doesn't work in this case. Is there something similar I could do? It would be especially helpful if users of my lib wouldn't have to change their application code, so I'd like to not have to require them to #define other variables if they are using two streams, but I guess I could last resort.

Thanks as always for the help, and I apologize if this solution was posted elsewhere. I did a quick search and came up empty.

Chris

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Thu Mar 25, 2010 10:15 pm

Quote:

#ifdef obviously doesn't work in this case. Is there something similar I could do?

The #if defined() syntax works with vs. 4.105. It can detect if a stream
is defined or not. Use it instead of #ifdef. Example:

Code:

#include <16F877.H>
#fuses XT, NOWDT, BROWNOUT, PUT, NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS, stream=COM_A)
#use rs232(baud=9600, xmit=PIN_B1, rcv=PIN_B2, ERRORS, stream=COM_B)

//======================================
void main()
{
int8 c;

#if defined(COM_A)
c = 0x55;
#else
c = 0xAA;
#endif

while(1);
}

Display posts from previous:

	CCS Forum Index -> General CCS C Discussion	All times are GMT - 6 Hours
Page 1 of 1

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum