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C51: Absolute address for constants in CODE-space

Does anyone knows a methode, to declare a const struct in code-space at a specific CODE address in C51?

Background:

I use a philips 87LPC767-MC and i want to store some code-revision-info in the 32Byte customer code space.
I will define a C-Structure like

typedef struct
{
unsigned char uc_software_code;
unsigned char uc_main_version;
unsigned char uc_sub_version;
unsigned long ul_checksum;
} CodeRefInfo_ts;

CodeRefInfo_ts tsCodeRefInfo=
{
0x04,
0x01,
0x01,
0x012345678
} at 0xFC0E;

But it seems it is not possible to use the at-Keyword to locate a struct in the codespace?!

Any suggestion?

Thanks
Markus

Parents

0 Walt Conley over 23 years ago

Hi Markus:

This works for the C166. I use an assembly file and specify the start address with the CODE AT or ORG statements.

public CRC
public ST_ADDR
public ED_ADDR
public PART_NUMB

INFO_TAB SECTION CODE AT 0A000H

INFO_PROC PROC

   CRC:         dw  0432fH
   ST_ADDR:     dw  00000H
                dw  04000H
   ED_ADDR:     dw  00001H	
                dw  0FFFFH

                org 0A010H
   PART_NUMB:   db  "123456-002-05", 0

INFO_PROC ENDP
INFO_TAB  ENDS
          END

Hope this helps,
Walt

Reply

0 Walt Conley over 23 years ago

Hi Markus:

This works for the C166. I use an assembly file and specify the start address with the CODE AT or ORG statements.

public CRC
public ST_ADDR
public ED_ADDR
public PART_NUMB

INFO_TAB SECTION CODE AT 0A000H

INFO_PROC PROC

   CRC:         dw  0432fH
   ST_ADDR:     dw  00000H
                dw  04000H
   ED_ADDR:     dw  00001H	
                dw  0FFFFH

                org 0A010H
   PART_NUMB:   db  "123456-002-05", 0

INFO_PROC ENDP
INFO_TAB  ENDS
          END

Hope this helps,
Walt

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