Motorola DSP56800 Guía de usuario descargar pdf (Pagina 296)

100

101

ELF Linker and Command Language

Linker Command File Syntax

296

Targeting MC56F83xx/DSP5685x Controllers

.main_application :

{

# .text sections

*(.text)

*(.rtlib.text)

*(.fp_engine.txt)

*(user.text)

} > .text

__ROM_Address = 0x2000

.data : AT(__ROM_Address) # ROM Address definition

{

# .data sections

F__Begin_Data = .; # Start location for RAM (0x3000)

*(.data) # Write data to the section (ROM)

*(fp_state.data);

*(rtlib.data);

F__End_Data = .; # Get end location for RAM

# .bss sections

* (rtlib.bss.lo)

* (.bss)

F__ROM_Address = __ROM_Address

} > .data

}

To make the runtime copy from ROM to RAM, you need to know where the data starts

in ROM (__ROM_Address) and the size of the block in ROM you want to copy to

RAM. In the following example (Listing 10.18

), copy all variables in the data section

from ROM to RAM in C code.

Listing 10.18 ROM to RAM Copy From C After Writing Data Flash

#include <stdio.h>

#include <string.h>

int GlobalFlash = 6;

// From linker command file

extern __Begin_Data, __ROMAddress, __End_Data;

void main( void )

{

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