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Author Topic: MicroC, Macros, inline asm and parameters  (Read 1054 times)
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Elysion
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« on: March 08, 2015, 12:42:18 12:42 »

Hi,

I have a function like below. How could I make it compile?

MacroTest.c below

Code:
#include "MacroTest.h"

void main() {
    char var1;
   
    var1 = 80;

    SaveBankSelectRegister(var1);
}

MacroTest.h below

Code:
#ifndef __Macro
#define __Macro

#define SaveBankSelectRegister(SaveVariable)          asm { movff  BSR, SaveVariable }

#endif

Quote
Undeclared identifier '_var1' in expression MacroTest.c

Normally, if I use this as a function, I put a "_" infront of the variable in asm like below. What about using it in macros?

Code:
void SaveBankSelectRegister(char saveVariable)
{
   asm { movff  BSR, _saveVariable } 
}
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flo0319
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« Reply #1 on: March 08, 2015, 01:51:11 13:51 »

Hi , you need to use the concatenate operator ##

   
Code:
#define SaveBankSelectRegister(SaveVariable)          asm { movff  BSR, _##SaveVariable }
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zuisti
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« Reply #2 on: March 08, 2015, 09:21:54 21:21 »

This form is working:

Code:
#define SaveBankSelectRegister(SaveVariable)   asm  movff  BSR, _##SaveVariable

char var1; // global, to save BSR

void main() {

    SaveBankSelectRegister(var1);
}
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Elysion
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« Reply #3 on: March 25, 2015, 09:17:02 21:17 »

Hi,

I have the below code. How is the correct phrase? Thanks.


source:
Code:
#include "MacroTest.h"

char  x1;
char  x2;

void main() {

    x1 = 1;
    x2 = 1;

    TestMacro(x1);
}

header:
Code:
#define TestMacro(sample )    _asm { movf        _##sample+1,0,1         \
                                        xorwf         _x2+1,0,1     \
                                   }\


Posted on: March 25, 2015, 08:50:42 20:50 - Automerged

Ok. Smiley ";" done all the magic.

Thanks
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