ev960jxtimer.c

IXP425的BSP代码

* This routine enables auxiliary clock interrupts.
*
* RETURNS: N/A
*
* SEE ALSO: sysAuxClkDisable()
*/

void sysAuxClkEnable (void)
    {
    if (!sysAuxClkRunning)
        {
	/* Set the Timer Count register to 0 */
	*EP960_TCR1 = (CPU_SPEED_MHZ * 1000000 / auxClkTicksPerSecond);
	
	/* Load the Timer Reload register */
	*EP960_TRR1 = (CPU_SPEED_MHZ * 1000000 / auxClkTicksPerSecond);
	
	/* Set the Timer mode Register */
	*EP960_TMR1 = 7;
	
	/* Enable the timer interrupt bits in the IMSK register */
	*EP960_IMSK |= 0x2000;

        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 (auxClkTicksPerSecond);
    }

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

    auxClkTicksPerSecond = ticksPerSecond;

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

    return (OK);
    }

#ifdef INCLUDE_TIMESTAMP

#include "drv/timer/timestampDev.h"
	

/* Locals */ 

LOCAL int     sysTimestampTicksPerSecond = 60; 
LOCAL BOOL    sysTimestampConnected      = FALSE; 
LOCAL BOOL    sysTimestampRunning        = FALSE; 
LOCAL FUNCPTR sysTimestampRoutine        = NULL; 
LOCAL int     sysTimestampArg            = NULL;


/**************************************************************************
*
* sysTimestampInt - timestamp timer interrupt handler
*
* This routine handles the timestamp timer interrupt.   A user routine is
* called, if one was connected by sysTimestampConnect().
*
* RETURNS: N/A
*
* SEE ALSO: sysTimestampConnect()
*/

LOCAL void sysTimestampInt (void)
    {
    if (sysTimestampRoutine != NULL)     /* call user-connected routine */
        (*sysTimestampRoutine) (sysTimestampArg);
    }

/**************************************************************************
*
* sysTimestampConnect - connect a user routine to a timestamp timer interrupt
*
* This routine specifies the user interrupt routine to be called at each
* timestamp timer interrupt.  
*
* RETURNS: OK, or ERROR if sysTimestampInt() has not been used.
*
* SEE ALSO: sysTimestampEnable()
*/

STATUS sysTimestampConnect
    (
    FUNCPTR routine, /* routine called at each timestamp timer interrupt */
    int arg          /* argument with which to call routine */
    )
    {

    sysTimestampConnected = TRUE; 
    sysTimestampRoutine = routine;
    sysTimestampArg = arg;
    return (OK);

    }

/**************************************************************************
*
* sysTimestampEnable - enable a timestamp timer interrupt
*
* This routine enables timestamp timer interrupts and resets the counter.
*
* RETURNS: OK, or ERROR if the timestamp timer cannot be enabled.
*
* SEE ALSO: sysTimestampDisable()
*/

STATUS sysTimestampEnable(void)
    {

    if (!sysTimestampRunning)
	{

        (void)intConnect ((void *)VECTOR_TMR1, sysTimestampInt, 0);

	/* Set the Timer Count register to 0 */
	*EP960_TCR1 = TIMER_ROLL_OVER;
	
	/* Load the Timer Reload register */
	*EP960_TRR1 = TIMER_ROLL_OVER;
	
	/* Set the Timer mode Register */
	*EP960_TMR1 = 0x37; /* timer clock = cpu clock / 8 */
	
	/* Enable the timer interrupt bits in the IMSK register */
	*EP960_IMSK |= 0x2000;

        sysTimestampRunning = TRUE;

	}

    /* Aux clock and Timestamp timer both are on the same vector */
    
    return (OK);
    }


/**************************************************************************
*
* sysTimestampDisable - disable a timestamp timer interrupt
*
* This routine disables the timestamp timer.  It does not directly disable
* interrupts.  However, the tick counter does not increment once the 
* timestamp timer is disabled, thus, interrupts are no longer generated.
* This routine merely resets the timer counter.
*
* RETURNS: OK, always.
*
* SEE ALSO: sysTimestampEnable()
*/

STATUS sysTimestampDisable (void)
    {
    if (sysTimestampRunning)
	{

	/* Mask the timer interrupt bits in the IMSK register */
	*EP960_IMSK &= 0x10ff;

	/* Set the Timer mode Register */
	*EP960_TMR1 = 0;

	/* Clear the timer interrupts in IPND register, if any */
	vxIPNDClear(0x2000);


	sysTimestampRunning = FALSE;
	}

    return (OK);
    }


/**************************************************************************
*
* sysTimestampPeriod - get the period of a timestamp timer 
*
* This routine gets the period of the timestamp timer, in ticks.  The
* period, or terminal count, is the number of ticks to which the timestamp
* timer counts before rolling over and restarting the counting process.
*
* RETURNS: The period of the timestamp timer in counter ticks.
*/

UINT32 sysTimestampPeriod (void)
    {
    /* 
     * Return the timestamp timer period here.
     * The highest period (maximum terminal count) should be used so
     * that rollover interrupts are kept to a minimum.
     *
     */
    return (TIMER_ROLL_OVER);

    }


/**************************************************************************
*
* sysTimestampFreq - get a timestamp timer clock frequency
*
* This routine gets the frequency of the timer clock, in ticks per 
* second.  The rate of the timestamp timer is set explicitly by the 
* hardware and typically cannot be altered.
*
* RETURNS: The timestamp timer clock frequency, in ticks per second.
*/

UINT32 sysTimestampFreq (void)
    {

    /*
     * Return the timestamp tick output frequency here.
     * This value can be determined from the following equation:
     *     timerFreq = clock input frequency / prescaler
     *
     * When possible, read the clock input frequency and prescaler values
     * directly from chip registers.
     */

    return ((1000000 * CPU_SPEED_MHZ) / 8);
    }


/**************************************************************************
*
* sysTimestamp - get a timestamp timer tick count
*
* This routine returns the current value of the timestamp timer tick counter.
* The tick count can be converted to seconds by dividing it by the return of
* sysTimestampFreq().
*
* This routine should be called with interrupts locked.  If interrupts are
* not locked, sysTimestampLock() should be used instead.
*
* RETURNS: The current timestamp timer tick count.
*
* SEE ALSO: sysTimestampFreq(), sysTimestampLock()
*/

UINT32 sysTimestamp (void)
    {
    unsigned long countValue;

    /* Read the timer counter register */

    countValue = ((TIMER_ROLL_OVER - *EP960_TCR1));

    /* return the timestamp timer tick count here */

    return (countValue);
    }


/**************************************************************************
*
* sysTimestampLock - lock interrupts and get the timestamp timer tick count
*
* This routine locks interrupts when the tick counter must be stopped 
* in order to read it or when two independent counters must be read.  
* It then returns the current value of the timestamp timer tick
* counter.
* 
* The tick count can be converted to seconds by dividing it by the return of
* sysTimestampFreq().
*
* If interrupts are already locked, sysTimestamp() should be
* used instead.
*
* RETURNS: The current timestamp timer tick count.
*
* SEE ALSO: sysTimestampFreq(), sysTimestamp()
*/

UINT32 sysTimestampLock (void)
    {
    unsigned long countValue;

    /* Read the timer counter register */

    countValue = (TIMER_ROLL_OVER - *EP960_TCR1);

    /* return the timestamp timer tick count here */

    return (countValue);
    }

#endif   /* INCLUDE_TIMESTAMP */