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The uses of the __LINE__ operator

 
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future



Joined: 14 May 2004
Posts: 330

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The uses of the __LINE__ operator
PostPosted: Mon Jul 17, 2006 11:16 am     Reply with quote
Hi,

I am trying to run the protothread samples from:

http://www.sics.se/~adam/pt/

It uses the __LINE__ operator to set a variable like:

Long a;
a = __LINE__;

But the compiles does not expand it and generates an error about the unknown identifier.

Is this correct and it must be only used in defines and print?
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Jul 17, 2006 12:08 pm     Reply with quote
It works with PCM vs. 3.249. Here is the ASM code from the .LST
file for the program shown below.
Code:

0000            00302 ....... a = __LINE__; 
000C 1283       00303 BCF    03.5   // Bank 0
000D 01A2       00304 CLRF   22    // MSB = 0
000E 300A       00305 MOVLW  0A
000F 00A1       00306 MOVWF  21   // LSB = 0x0A  (line 10)

Code:

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

//=================================
main()
{
Long a;

a = __LINE__;

while(1);
}
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