How to declare an array that fills an entire section?

David Aldrich92784

Genius 3720 points

I am familiar with how to define an array that is to placed in a specific area of memory. For example:

const unsigned MY_TABLE_SIZE=1024;

#pragma DATA_ALIGN(4);

#pragma DATA_SECTION(".ddr_table")

unsigned myTable[MY_TABLE_SIZE];

Is it possible to automatically size the array to fit an entire section?

I am thinking of something like:

const unsigned MY_TABLE_SIZE = DATA_SECTION_SIZE(".ddr_table");

#pragma DATA_SECTION(".ddr_table")

unsigned myTable[MY_TABLE_SIZE];

Best regards

David

0 George Mock over 12 years ago

David Aldrich92784 said:
Is it possible to automatically size the array to fit an entire section?

You can do something similar by using the #include feature of linker command files.

This header file gets included by both your C code and your link command file. Note "MR" stands for memory range.

// mr_lengths.h -------------------------------
#define MR_LENGTH 0x1000

Your C code is similar to this.

#include "mr_lengths.h"

#pragma DATA_SECTION(table, "special_section");
unsigned table[MR_LENGTH/sizeof(unsigned)];

And your link command file has lines similar to this.

#include "mr_lengths.h"

MEMORY
{
   MR_SPECIAL : org = 0x80000000, len = MR_LENGTH
}

SECTIONS
{
   special_section > MR_SPECIAL
}

Notice how MR_LENGTH is defined once and used in both the C source and the link command file.

Thanks and regards,

-George

0 David Aldrich92784 over 12 years ago in reply to George Mock

Genius 3720 points

Hi George

Thanks for your answer.

Best regards

David

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