Zilog ZUSBOPTS Instrukcja Użytkownika Pobierz pdf (Strona 345)

UM017105-0511 Program Configurations

Zilog Developer Studio II – ZNEO™

User Manual

317

ZNEO devices, so the Download to RAM Program Configuration could be limited to

small applications or portions of applications during development.

C Program Setup

The C program setup for Download to RAM Program Configuration is similar to the

Default Program Configuration with some additional steps, as described in this section.

The C-Compiler by default generates the executable program code under one unified seg-

ment named CODE. The CODE segment belongs to EROM address space. To set up this

configuration, you must move the CODE segment from EROM to the RAM address

space. Do this by adding the following linker command in the

Additional Linker Direc-

tives

dialog box (see Additional Directives – see page 62):

change code=RAM /* The linker will then allocate code segment in

RAM */

To go back to the Default Program Configuration for production code, remove this direc-

tive from the

Additional Linker Directives dialog box.

Special Case: Partial Download to RAM

A special case of this configuration is when you want to download program code from just

one C source file into RAM, while retaining the rest of the code in EROM. This allows

you to experiment with different partitions of your code, for example, if you are consider-

ing the Partial Copy to RAM Program Configuration discussed in the Special Case: Partial

Copy to RAM section on page 325. Perform the following steps:

1. Select the

Distinct Code Segment for Each Module checkbox in the Advanced

page in the

Project Settings dialog box (discussed on page 59).

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

file.

2. Use the linker CHANGE directive to move the particular segment to RAM. For exam-

ple:

To download the code for

main.c to RAM, add the following linker command in the

Additional Linker Directives dialog box (see Additional Directives – see page 62):

change main_TEXT = RAM

To go back to the Default Program Configuration for production code, remove this

directive from the

Additional Linker Directives dialog box.

Assembly Program Setup

The Assembly program setup for the Download to RAM Program Configuration is similar

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

section.

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