auxtimer.c

ge公司的dv4av4信号处理板的bsp源代码

/***************************************************************************
*
*  $RCSfile: auxTimer.c $
*
*  Copyright 2001 by Dy 4 Systems, Inc.  All Rights Reserved.
*
*  $Revision: 1.6 $
*
*  $Name: AV4-ISP-R1.2-1 AV4-ISP-R1.2-0 HMTST2 HMTST1 DVT_AV4_4.101 AV4-VSP-R1.0-2 AV4-VSP-R1.0 CT-ISP-1.1 AV4 ISP 1.1 CT_R0.1_AV4/CAV4 champtools2.22 CAV4_CP1 CHAMPtools FW 3.0 champtools2.21_1215 champtools2.21 champ221_build1 champtools2.2 CHAMPtools_2.1.1_AV3 CHAMPtools_2.1_106 CHAMPtools_2.0_AV3 $  $State: Developmental $  $Locker: $
*
*  $Source: L:/SWRND/champAV2/src/vx/src/drv/timer/rcs/auxTimer.c $
*
*  RCS Project Name:
*
*  CSC:
*
*  Target:
*
*  Description:
*
*  Usage:
*
*  $Log: auxTimer.c $
*  Revision 1.6  2003/08/05 20:03:58Z  esaunder
*  Modified to utilize AV3 timer resource allocation functions (bslTimerAlloc,
*  bslTimerDealloc); timer allocated only while enabled.
*  Revision 1.5  2002/03/27 20:02:27  dsessler
*
****************************************************************************/


/* includes */

#include "vxWorks.h"
#include "config.h"
#include "bsl.h"


/* locals */

LOCAL FUNCPTR      sysAuxClkRoutine = 0;
LOCAL int          sysAuxClkArg	= 0;
LOCAL int          sysAuxClkTicksPerSecond  = 100; 
unsigned long      auxClkTicks = 0;


char	      	   sysAuxClkName[]  = "Aux Clock";
int	           sysAuxClkTimerID = -1;



/*******************************************************************************
*
* sysAuxClkInt - handle an auxiliary clock interrupt
*
* This routine handles an auxiliary clock interrupt. Calls the routine 
* installed by sysAuxClkConnect().
*
* RETURNS: N/A
*/

void sysAuxClkInt (void)
    {
    /* call auxiliary clock service routine */

    if (sysAuxClkRoutine != NULL)
	(*sysAuxClkRoutine) (sysAuxClkArg);
    auxClkTicks += 1;
    }

/*******************************************************************************
*
* sysAuxClkConnect - connect a routine to the auxiliary clock interrupt
*
* This routine specifies the interrupt service routine to be called at each
* auxiliary clock interrupt.  It does not enable auxiliary clock interrupts.
*
* RETURNS: OK, or ERROR if the routine cannot be connected to the interrupt.
*
* SEE ALSO: intConnect(), sysAuxClkEnable()
*/

STATUS sysAuxClkConnect
    (
    FUNCPTR routine,    /* routine called at each aux clock interrupt */
    int arg             /* argument to auxiliary clock interrupt routine */
    )
    {
    sysAuxClkArg	    = arg;
    sysAuxClkRoutine	= routine;

    return (OK);
    }

/*******************************************************************************
*
* sysAuxClkDisable - turn off auxiliary clock interrupts
*
* This routine disables auxiliary clock interrupts and releases the
* timer resource.
*
* RETURNS: N/A
*
* Notes:   o No-op if the PCI bridge onboard this Champ AV does not support
*	     enough timer resources.
*
* SEE ALSO: sysAuxClkEnable()
*/

void sysAuxClkDisable (void)
{
    if( sysAuxClkTimerID == -1 ) return;
    else
    {
        bslTimerIntDisable( sysAuxClkTimerID );
        bslTimerStop( sysAuxClkTimerID );
        bslTimerDealloc( sysAuxClkName );
        sysAuxClkTimerID  =  -1;
    }
}

/*******************************************************************************
*
* sysAuxClkEnable - turn on auxiliary clock interrupts
*
* This routine enables auxiliary clock interrupts.
*
* RETURNS: N/A
*
* Notes:   o No-op if the PCI bridge onboard this Champ AV does not support
*	     enough timer resources.
*
* SEE ALSO: sysAuxClkConnect(), sysAuxClkDisable(), sysAuxClkRateSet()
*/

void sysAuxClkEnable (void)
{
    /**  Note: NON_EXCL mode tolerates superfluous calls to sysAuxClkEnable by app.  **/

    if( bslTimerAlloc( sysAuxClkName, NON_EXCL, &sysAuxClkTimerID ) != BSL_ERROR_NONE )
    {
        sysAuxClkTimerID  =  -1;
	return;
    }
    else
    {
        intConnect( INUM_TO_IVEC( bslTimerToId( sysAuxClkTimerID )), sysAuxClkInt, 0 );
        bslTimerSetFreq( sysAuxClkTimerID, sysAuxClkTicksPerSecond );
        bslTimerIntEnable( sysAuxClkTimerID );
        bslTimerStart( sysAuxClkTimerID );
    }
}

/*******************************************************************************
*
* sysAuxClkRateGet - get the auxiliary clock rate
*
* This routine returns the interrupt rate of the auxiliary clock.
*
* RETURNS: The number of ticks per second of the auxiliary clock.
*
* SEE ALSO: sysAuxClkEnable(), sysAuxClkRateSet()
*/

int sysAuxClkRateGet (void)
    {
    return (sysAuxClkTicksPerSecond);
    }

/*******************************************************************************
*
* sysAuxClkRateSet - set the auxiliary clock rate
*
* This routine sets the interrupt rate of the auxiliary clock.  It does not
* enable auxiliary clock interrupts.
*
* RETURNS: OK, or ERROR if the tick rate is invalid or the timer cannot be set.
*
* SEE ALSO: sysAuxClkEnable(), sysAuxClkRateGet()
*/

STATUS sysAuxClkRateSet
    (
    int ticksPerSecond  /* number of clock interrupts per second */
    )
    {
    if (ticksPerSecond < AUX_CLK_RATE_MIN || ticksPerSecond > AUX_CLK_RATE_MAX)
        return( ERROR );
    if( sysAuxClkTimerID == -1 ) return( ERROR );

    sysAuxClkTicksPerSecond = ticksPerSecond;
    sysAuxClkDisable ();
    sysAuxClkEnable ();

    return (OK);
    }