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overriding redeclaration of a variable in application

VishwasaV
Prodigy 40 points

i have created a static variable called memlen in a library decoder.pjt in a header file called typedefs.h.

since it is included many times in the project; it creates more than one instances of memlen.

the same file is included in application.pjt also...

sow to overcome this problem to have only one instance of variable

  • TI__Guru 64450 points

    A typical practice to use is to cradle the variables, typedefs, etc. in a header file with the following construct.

    #ifndef TYPEDEFS_H
    #define TYPEDEFS_H

    <your stuff normally in typedefs.h>

    #endif

  • in reply to BrandonAzbell
    TI__Guru*** 125430 points

    Declare your variable in the C source file where you want to use it rather than in that header file.  As you have discovered, declaring the variable in the header file creates multiple instances of the variable.  If you want to have a variable declared in a library but globally accessible then you should declare the variable in the source file and extern the variable in the header file.

  • in reply to Brad Griffis
    Intellectual 355 points

    I am new to CCS v4, but when I try to declare my global variables in a global_vars.h file, CCS complains about expecting a "{" right before the first extern variable.

    This same syntx worked in IAR. Am I missing something silly? Error is at the line withthe first "extern"

    #ifndef

     

     

    extern unsigned char TXByteCtr;
    extern unsigned char RXByteCtr;
    extern unsigned char TXData;
    extern unsigned char RXData;
    extern unsigned char TestData;
    ...

     GLOBAL_EXTERNS_H
    #define GLOBAL_EXTERNS_H
  • in reply to Daniel Staver
    Intellectual 355 points

    for some reason the post messed up text, but it originally looked like this:
    (here's hoping it takes it this time)

    #ifndef GLOBAL_EXTERNS_H
    #define     GLOBAL_EXTERNS_H

     

     

    extern unsigned char TXByteCtr;
    extern unsigned char     RXByteCtr;
    extern     unsigned char     TXData;
    extern     unsigned char     RXData;
    extern     unsigned char     TestData;
    ...
  • in reply to Daniel Staver
    Intellectual 355 points

    Please ignore this. Just a forgotten ";" not flagged in a previous file and me getting used to CCS error messages. :-(