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STR71x SOFTWARE DEVELOPMENT GETTING STARTED

2 SOFTWARE EXAMPLE

This chapter describes an STR71x software example. The first part enumerates the standard

files required to build an application. The second part describes an application example.

This chapter assumes that both the hardware and the software environments are setup as de-

scribed previously.

2.1 GENERIC CONFIGURATION FILES

This section describes the standard files required by any STR71x application. These files are

mandatory for building a project for STR71x cores.

The table below enumerates and explains the use of each file.

File

Description

71x_vect.s

This file contains exception vectors and exception handlers. For this example

RAM is fixed at address 0x0.

71x_map.h

This file contains the memory mapping and physical registers address defini-

tions.

71x_init.s

This file performs initialization of stack pointers for each mode, Enhanced Inter-

rupt Controller initialization, and branches to __main in the C library.

retarget.c

This file provides a retarget layer for low-level Input/Output. Typically, this con-

tains your own target-dependent implementations of fputc(), ferror(),....Semi-

hosting SWIs are used to display text on the console of the host debugger.

scat.scf

An image is made up of regions and output sections. Every region in the image

can have a different load and execution address. The scatter-loading mecha-

nism enables you to specify the memory map of an image to armlink. For more

information on the scatter file, load and execution regions, refer to the ’ARM

Linker and Utilities Guide’.