RAM 6.0 BUX II Series Guía de usuario descargar pdf (Pagina 41)

2 Overview of a BSP

2.3 Components of a BSP

development effort. The following pages describe the initial code for each required

routine, and the file in which it is usually included.

sysBspRev( )

The routine sysBspRev( ) is identical in all BSPs. This routine can be taken directly

from the reference or template BSP and does not require modification.

Timer Driver Routines

Timer driver routines include the following:

There are several timer drivers provided by Wind River. Files for these drivers are

located in the target/src/drv/timer directory. If one of the existing timer drivers

works for your target board, your sysLib.c file can simply include the appropriate

file from the timer directory. For example, the MIPS R4000 processor includes an

on-chip timer. This timer driver is provided in

target/src/drv/timer/mipsR4kTimer.c. If your board uses this processor, your

sysLib.c file can include the driver as follows:

#include "timer/mipsR4kTimer.c" /* system timer */

In some cases, you may need to include both a header file from target/h/drv/timer

and a source file from target/src/drv/timer. Check the target/h/drv/timer directory

to see whether a header file for your driver is available.

If a standard timer driver is not provided for your target hardware, you may be

able to copy an existing timer driver file to the BSP directory and make minor

modifications. If you do this, it is wise to change the file name and routine names

to avoid confusion. For example, some BSPs for ARM processors started with the

ambaTimer.c file and renamed it as the ixm1200Timer.c file. Be sure to document

the name of the original driver in the source file.

In rare situations, you may need to create a custom sysTimer.c file. If this is the case

for your BSP, you can copy routine prototypes for the sysClk*() routines from any

of the existing timer drivers in target/src/drv/timer.

sysClkConnect( )

sysClkDisable( )

sysClkEnable( )

sysClkInt( )

sysClkRateGet( )

sysClkRateSet( )

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RAM 6.0 BUX II Series Guía de usuario Pagina 41