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Using _at_ keyword.

Saul Bencke

Hi,
I put a variable in a fixed adress using the _at_ expression, as follow:


xdata PSD_REGS PSD8xx_reg _at_ 0x9000;

It works fine, now I would like to acess this variable in other souce code. I try to make a lot of things like declare it on my header file, put extern before the expression, but anything works. Somebody can help me ?

Parents
  • 0 in reply to Saul Bencke

    You should have an extern reference to the actual variable, as well as the type, in the header file for this module:

    xx1.h:
    typedef xdata struct REG_PSD_struct {
    }PSD_REGS;

    extern xdata PSD_REGS PSD8xx_reg;

    This allows other modules to see the variable that's actually allocated in xx1.c, which is the only place that needs the _at_ keyword.

    xx1.c:
    xdata PSD_REGS PSD8xx_reg _at_ 0x9000;

Reply
  • 0 in reply to Saul Bencke

    You should have an extern reference to the actual variable, as well as the type, in the header file for this module:

    xx1.h:
    typedef xdata struct REG_PSD_struct {
    }PSD_REGS;

    extern xdata PSD_REGS PSD8xx_reg;

    This allows other modules to see the variable that's actually allocated in xx1.c, which is the only place that needs the _at_ keyword.

    xx1.c:
    xdata PSD_REGS PSD8xx_reg _at_ 0x9000;

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