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Memory Specific Pointers

Nick Daniel

Hello,

I am delcaring some memory specific pointers using the examples on page 76 of the C51 Compiler Users Guide 01.97.

unsigned char xdata * idata key
Meaning a pointer in idata to a xdata unsigned char.

When I compile this I get a warning. 
warning C258: 'key' mspace on parameter ignored
If I ignore this warning the code works fine, but I don't like ignoring warnings uless I understand the problem.

Does anyone know why this code generates a warning? I have searched through the Keil site but have had no success.

Thanks,
Nick

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  • 0 in reply to Bob Horeck

    Thanks Bob,

    I have just read that section now and it has cleared up a few other confusions for me.

    I think I have solved my original problem, as the warnings were generated when the pointer declaration was a parameter in a function declaration. Of course I shouldn't have specified the memory type of the pointer in the function declaration, just the memory type of what is being pointed to.

    Thanks again,
    Nick

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  • 0 in reply to Bob Horeck

    Thanks Bob,

    I have just read that section now and it has cleared up a few other confusions for me.

    I think I have solved my original problem, as the warnings were generated when the pointer declaration was a parameter in a function declaration. Of course I shouldn't have specified the memory type of the pointer in the function declaration, just the memory type of what is being pointed to.

    Thanks again,
    Nick

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