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How to get the start address of the memory segment defined in linker file.

vinoth s1
Intellectual 660 points 
MEMORY
{
    SFR                     : origin = 0x0000, length = 0x0010
    PERIPHERALS_8BIT        : origin = 0x0010, length = 0x00F0
    PERIPHERALS_16BIT       : origin = 0x0100, length = 0x0100
    RAM                     : origin = 0x1100, length = 0x1000
    INFOA                   : origin = 0x10C0, length = 0x0040
    INFOB                   : origin = 0x1080, length = 0x0040
    INFOC                   : origin = 0x1040, length = 0x0040
    INFOD                   : origin = 0x1000, length = 0x0040
    FLASH                   : origin = 0x2100, length = 0xCA27
    IDR_SEGS                : origin = 0xEBDC, length = 0x11FF
...

I want to the start address of a segment IDR_SEGS, that is 0xEBDC.
How do i get start adress using a macro and store it in a variable in c source code?

 

  • TI__Guru**** 253390 points

    You could do something like this in the linker command file ...

    #define IDR_SEG_BASE 0xEBDC
/* ... */

csymbol_idr_seg_base = IDR_SEG_BASE;
/* ... */

MEMORY
{
   /* ... */
   IDR_SEGS : origin = IDR_SEG_BASE, length = 0x11FF
   /* ... */
}

/* ... */

    For the details on how to use csymbol_idr_seg_base in your C code, please see the section titled Accessing Assembly Language Constants in the MSP430 compiler manual.

    Thanks and regards,

    -George

  • in reply to George Mock
    Intellectual 660 points

    I will try this, but if i need multiple segment base address how can i do it?

    ex FLASH segment or any application specific like IDR_SEGS segment..

  • in reply to vinoth s1
    TI__Guru**** 253390 points

    There is no automated method.  You have to repeat the #define technique for every memory range where it is needed.

    Thanks and regards,

    -George

  • in reply to George Mock
    Intellectual 660 points

    George, Thanks for ur inputs..

    Do u mean Something like below for multiple segment base.

    ==============

    In Linker File

    ==============

    #define IDR_SEG_BASE 0xEBDC
    #define SEC_KEY_SEG_BASE 0xFDDB
     
    /* ... */
     
    csymbol_idr_seg_base = IDR_SEG_BASE; /* ... */
    csymbol_sec_key_seg_base = SEC_KEY_SEG_BASE; /* ... */
     
    MEMORY
    {
       /* ... */
       IDR_SEGS : origin = IDR_SEG_BASE, length = 0x11FF
       SEC_KEY_SEG : origin = SEC_KEY_SEG_BASE, length = 0x01FF
       /* ... */
    }
      /* ... */

     ===========

    In source file

    =============

    WORD var1 = IDR_SEG_BASE;

    WORD var2 = SEC_KEY_SEG_BASE;

     

  • in reply to vinoth s1
    TI__Guru**** 253390 points

    Yes.  Except the C code should use the "csymbol" names per the technique I mentioned in my first post.

    Thanks and regards

    -George