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VxWorks

BSP Developer’s Guide, 6.0

responsible for any board initialization not completed in sysHwInit( ), such as the

connection of interrupt sources using intConnect( ).

Next, the usrRoot( ) routine continues the clock initialization. It sets the default

clock rate to the value of the macro

SYS_CLK_RATE, typically 60 Hz. usrRoot( )

then enables the system clock with a call to sysClkEnable( ).

Once the clock is initialized and running, several kernel modules, such as

selectLib, the I/O subsystem, and the console, are initialized. For details, see the

source code in usrConfig.c as well as the macros defined in configAll.h and

config.h.

INCLUDE_WDB is defined, wdbConfig( ) in target/src/config/usrWdb.c is

called. This routine initializes the agent’s communication interface, and then starts

the debug agent. For information on configuring the agent and the agent’s

initialization sequence, see your Wind River tools documentation. The debug

agent is the portion of VxWorks that connects to and serves the IDE tools such as

the shell and the debugger.

If the

INCLUDE_USR_APPL macro is defined, the default usrRoot( ) code executes

the

USER_APPL_INIT macro. This macro allows you to start your application

automatically at boot time. The BSP assumes that the

USER_APPL_INIT macro is a

valid C statement. For more information on

USER_APPL_INIT, see the appropriate

VxWorks programmer’s guide.

2.3 Components of a BSP

The BSP directory contains source files, header files, a makefile (Makefile), one or

more documentation files (target.nr or target.ref), and possibly other files such as

object modules distributed in object format only. The directory also includes

derived files based on the directory contents, such as object modules,

documentation files in a more readable format (HTML), and so forth.

From the BSP directory, other derivative files may be generated; for example, there

may be files generated for a project. Some derived files are not put into the BSP

directory itself. These include the WPJ project file, additional source and header

NOTE: The system clock can be dynamically changed from the shell or from an

application. However, facilities that take a “snapshot” of the clock rate (for

example, spyLib) can be broken by an unexpected rate change.

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RAM 6.0 BUX II Series Guía de usuario Pagina 28