m5200slicetimer.c

mpc5200 for bsp,it is have passed built.

/* m5200SliceTimer.c - MPC5200 Slice Timer library */

/* Copyright 1984-2003 Wind River Systems, Inc. */

/*
modification history
--------------------
01b,24sep03,pdr  fixed bugs, merge changes for SLT0.
01a,15sep03,pdr  written.
*/

/*
DESCRIPTION
This driver provides the auxilliary clock support.
The auxiliary clock will use the Slice Timer of the MPC5200.

By the default the slice timer 1 is used for the auxiliary clock.
If the slice timer 0 has to be used for the auxiliary clock
(not recommended), then the macro AUX_CLOCK_SLT0 need to be defined
and the macro USE_CRITICAL_INTERRUPTS need to be set to 1.

The macros AUX_CLK_RATE_MIN, and AUX_CLK_RATE_MAX must be defined
to provide parameter checking for the sysAuxClkRateSet() routines.

INCLUDES:
timestampDev.h, m5200SliceTimer.h
*/

/* includes */

#include "vxWorks.h"
#include "config.h"
#include "drv/timer/timerDev.h"
#include "drv/timer/timestampDev.h"
#include "drv/timer/m5200SliceTimer.h"

/* defines */

/* locals */

LOCAL FUNCPTR sysAuxClkRoutine	  = NULL;
LOCAL int sysAuxClkArg		      = 0;
LOCAL BOOL sysAuxClkRunning	      = FALSE;
LOCAL int sysAuxClkTicksPerSecond = 100;

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

void sysAuxClkInt (void)
    {
#if defined(AUX_CLOCK_SLT0) && USE_CRITICAL_INTERRUPT
	/* Reset Slice Timer 0 Status Bit */
	*SLT0_STATUS = SLT_STATUS_RESET;

	m5200IntAck(INUM_SLT0);
#else
	/* Reset Slice Timer 1 Status Bit */
	*SLT1_STATUS = SLT_STATUS_RESET;	/* acknowledge the interrupt */
#endif /* AUX_CLOCK_SLT0 */

    /* call auxiliary clock service routine */
	if (sysAuxClkRoutine != NULL)
		{
		(*sysAuxClkRoutine) (sysAuxClkArg);
		}
    }

/*******************************************************************************
*
* 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 */
    )
    {
    sysAuxClkRoutine = NULL;
    sysAuxClkArg	 = arg;
    sysAuxClkRoutine = routine;

    return (OK);
    }

/*******************************************************************************
*
* sysAuxClkDisable - turn off auxiliary clock interrupts
*
* This routine disables auxiliary clock interrupts.
*
* RETURNS: N/A
*
* SEE ALSO: sysAuxClkEnable()
*/

void sysAuxClkDisable (void)
    {
    if (sysAuxClkRunning)
        {
#if defined(AUX_CLOCK_SLT0) && USE_CRITICAL_INTERRUPT
		/* Reset Slice Timer 0 */
		*SLT0_CTRL = 0;
#else
		/* Reset Slice Timer 1 */
		*SLT1_CTRL = 0;
		
		intDisable(INUM_SLT1);
#endif /* AUX_CLOCK_SLT0 */

		sysAuxClkRunning = FALSE;
        }
    }

/*******************************************************************************
*
* sysAuxClkEnable - turn on auxiliary clock interrupts
*
* This routine enables auxiliary clock interrupts.
*
* RETURNS: N/A
*
* SEE ALSO: sysAuxClkConnect(), sysAuxClkDisable(), sysAuxClkRateSet()
*/

void sysAuxClkEnable (void)
    {
    static BOOL connected = FALSE;
	UINT32		countValue;

    if (!connected)
		{
#if defined(AUX_CLOCK_SLT0) && USE_CRITICAL_INTERRUPT
		intConnect(IV_SLT0, (VOIDFUNCPTR) sysAuxClkInt, 0);
#else
		intConnect(IV_SLT1, (VOIDFUNCPTR) sysAuxClkInt, 0);
#endif /* AUX_CLOCK_SLT0 */
		connected = TRUE;
		}

    if (!sysAuxClkRunning)
        {
		countValue = IPB_CLOCK / sysAuxClkTicksPerSecond;

#if defined(AUX_CLOCK_SLT0) && USE_CRITICAL_INTERRUPT
		/* Reset Slice Timer 0 */
		*SLT0_CTRL = 0;

		/* Reset Slice Timer 0 Status Bit */
		*SLT0_STATUS = SLT_STATUS_RESET;
	   
		/* Load Counter Value */
		*SLT0_TCNT = (countValue & 0x00FFFFFF);
    	
		/* Start Slice Timer 0 (Set Timer Enable Bit) */
		*SLT0_CTRL = (SLT_CTRL_ENABLE|SLT_CTRL_INT_ENABLE);

		intEnable(INUM_SLT0);
#else
		/* Reset Slice Timer 1 */
		*SLT1_CTRL = 0;

		/* Reset Slice Timer 1 Status Bit */
		*SLT1_STATUS = SLT_STATUS_RESET;
	   
		/* Load Counter Value */
		*SLT1_TCNT = (countValue & 0x00FFFFFF);
    	
		/* Start Slice Timer 1 (Set Timer Enable Bit) */
		*SLT1_CTRL = (SLT_CTRL_ENABLE|SLT_CTRL_INT_ENABLE|SLT_CTRL_RUN_WAIT);

		intEnable(INUM_SLT1);
#endif /* AUX_CLOCK_SLT0 */

		sysAuxClkRunning = TRUE;		
		}
    }

/*******************************************************************************
*
* 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);
		}

	sysAuxClkTicksPerSecond = ticksPerSecond;

	if (sysAuxClkRunning)
		{
		sysAuxClkDisable ();
		sysAuxClkEnable ();
		}

    return (OK);
    }