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Pointers to high banks?

 
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Pointers to high banks?
PostPosted: Mon Apr 26, 2004 11:52 pm     Reply with quote

I'm struggling to understand how CCS handles pointers...

I want to set up a pointer to some device registers in Bank3. When I look at the generated code, it seems to use only 8-bit pointers, ignoring the higher bits of the pointer and not setting the bank select bits in the STATUS register.

What am I doing wrong? This is an eg...
Code:

#byte      a_reg = 0x1a0

unsigned char buffer[8];

function() {
    int i = 0;
    unsigned char * Ptr = &a_reg;
    while(i<8) {
      buffer[i++] = *Ptr++;
      }
    }



When I look at similar code, it only use 8 bits for the pointer, clearly accessing bank 0, not bank 3.

Clues? Help?

Thanks.
Haplo



Joined: 06 Sep 2003
Posts: 659
Location: Sydney, Australia

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PostPosted: Mon Apr 26, 2004 11:58 pm     Reply with quote

Add this line to your code:

#device *=16

It tells the compiler to use 16 bit pointers (for 14 bit parts).
Jeprox
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PostPosted: Wed Apr 28, 2004 9:54 pm     Reply with quote

In addition to Haplo's answer initialise the pointers inside main() as well.
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