Problem with #define in microcontroller header file

[matheus]

Hi All!

   I have a problem with #defines in my application. It seems that my application don't recognizes mc9s08ac16.h #defines. My code seems like this:

#include "spihw.h"  //#include <mc9s08ac16.h> is in spihw.h

Hw_Init(){

UINT8 atualiza = 1;

do{

        if(atualiza)
        {
            atualiza = 0;
            ui16OldTime = TPM1CNT;
        }

        if( (TPM1CNT - ui16OldTime) > TPM1_1MS)
        {
            atualiza = 1;
            LED00 = !LED00;
        }
    }while(1);

}

When this code is running the ui16OldTime value is always zero and when I try watch TPM1CNT value data window shows a message: "undefined expression (unknown identifier)", but TPM1CNT is declared in mc9s08ac16.h.

  Someone know what is happening with my application?

  Thanks,

  Matheus.

[fabio]

Hello Matheus,

Did you initialize TPM1? Out of reset, TPM1SC = 0x00 meaning that the TPM clock source is disabled (the timer does not increment).

Regarding the TPM1CNT symbol, I agree with Allawtterb. The correct debugging symbol is _TPM1CNT.

Best regards,

[matheus]

  Hello Fabio!

  Yes I did. I was not using the _TPM1CNT debbuging symbol. When I used _TPM1CNT.Word instead of TPM1CNT I saw the correct value.

  Thanks for fast answer,

  Matheus.

[allawtterb · Accepted solution]

The actual variable behind TPM1CNT in the header is probably _TPM1CNT, try adding this to your watched expressions.  The debugger will not show the value of defines, these are only seen by the pre-processor.  TPM1CNT is replaced with whatever it is defined is, probably _TPM1CNT.Word.   

[matheus]

  Hello allawtterb!

  You are right. I used  _TPM1CNT.Word instead of TPM1CNT and the debugger showed me the correct value of PM1CNT.

  Thanks a lot,

  Matheus