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How to check if RS232 Stream is defined

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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);
}

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