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when I define a variable like next: uchar idata M_TVar _at_ 0x80; I got a warning: *** WARNING L4: DATA SPACE MEMORY OVERLAP FROM: 0000H TO: 0001H
the next is in .M51 file:
* * * * * * * D A T A M E M O R Y * * * * * * * IDATA 0000H 0001H ABSOLUTE * OVERLAP * IDATA 0000H 0001H ABSOLUTE * OVERLAP * REG 0000H 0008H ABSOLUTE "REG BANK 0" DATA 0008H 0040H UNIT ?DT?MAIN
how i fix it?
"but I don't know why"
The _at_ is only meaningful on a definition - not in a declaration
ie, _at_ doesn't make sense with extern!
You need something like
#ifdef DEFINE_GLOBAL // Make a definition #define EXT_ABS(name,loc) uchar idata name _at_ loc #else // Make an extern declaration #define EXT_ABS(name,loc) extern uchar idata name #else EXT_ABS( M_TVar, 0x80 );