Zilog ZUSBOPTS Manual do Utilizador descarregar pdf (Página 349)

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101

UM017105-0511 Program Configurations

Zilog Developer Studio II – ZNEO™

User Manual

321

This directs the C-Compiler to generate different code segment names for each file.

2. Add the linker commands to place the particular segment in ERAM at run time and

EROM at load time.

For example, to copy the code for

main.c to ERAM, add the following linker com-

mands in the

Additional Linker Directives dialog box (see Additional Directives –

see page 62):

change main_TEXT=ERAM /* Run time main_TEXT is in ERAM space */

copy main_TEXT EROM /* Load time main_TEXT is in EROM space */

define _low_main_copy = copy base of main_TEXT

define _low_main = base of main_TEXT

define _len_main = length of main_TEXT

3. The linker COPY directive only designates the load addresses and the run-time

addresses for the segment. The actual copying of the segment must be performed by

the start-up code. For example, if you are using the small model, copy and modify the

C startup provided in the installation under

src\boot\common\startupexs.asm,

rewriting the relevant section as follows:

;

; Copy main_TEXT into ERAM

;

LEA R0,_low_main_copy

LEA R1,_low_main

LD R2,#_len_main+1

JP mlab1

mlab0:

LD.B R3,(R0++)

LD.B (R1++),R3

mlab1:

DJNZ R2,mlab0

XREF _low_main_copy:EROM

XREF _len_main:ERAM

XREF _low_main:ERAM

4. Finally, add your modified start-up module to your project by selecting the Included

in Project

button in the Objects and Libraries page of the Project Settings dialog

box (see C Start-up Module

– see page 66) and also add the modified source code file

to your project using the Add Files command from the

Project menu.

Assembly Program Setup

The Assembly program setup for the Copy to ERAM Program Configuration is similar to

the Default Program Configuration with some additional guidelines, as described in this

section.

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