systimer.c

嵌入式操作系统VxWorks中板级支持包文件

    sysAuxClkRoutine   = routine;
    sysAuxClkArg       = arg;

    if(!sysAuxClkConnected)
	{
        (void)intConnect (INUM_TO_IVEC(template_INT_TMR1), sysAuxClkInt, 0);

        /* Lock Interrupts */
        locKey = intLock();

        sysEnable_Reload_TMR1 ();

        /* UnLock Interrupts */
        intUnlock (locKey);
 
        sysAuxClkConnected = TRUE;
	}

    return (OK);
    }

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

void sysAuxClkDisable (void)
    {
    int locKey;

    if (sysAuxClkRunning)
	{
        intDisable(template_INT_TMR1);

        /* Lock Interrupts */
        locKey = intLock();

        sysDisable_TMR1 ();

        /* UnLock Interrupts */
        intUnlock (locKey);

        sysAuxClkRunning = FALSE;
	}
    }

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

void sysAuxClkEnable (void)
    {
    int locKey;

    if (!sysAuxClkRunning)
	{
        /* Lock Interrupts */
        locKey = intLock();

        sysWrite_TCR1 (sysClockTimerRollOver);
        sysWrite_TRR1 (sysClockTimerRollOver);
        sysEnable_TMR1 ();

        /* UnLock Interrupts */
        intUnlock (locKey);

        intEnable(template_INT_TMR1);
        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 (sysAuxClockTicksPerSecond);
    }

/***************************************************************************
*
* 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 */
    )
    {
    int locKey;

    if (ticksPerSecond < AUX_CLK_RATE_MIN || ticksPerSecond > AUX_CLK_RATE_MAX)
    return (ERROR);

    /* Lock Interrupts */
    locKey = intLock();

    /* 600MHz/16 = 37.5MHz, at 37.5Mhz clock, 60 ticks per sec. requires rollover of 625000 */
    sysWrite_CSel_TMR1 (template_TMR_CSEL_CORE16);

    /* UnLock Interrupts */
    intUnlock (locKey);

    sysAuxClockTicksPerSecond = ticksPerSecond;
    sysAuxClockTimerRollOver = (_busClockRate / sysAuxClockTicksPerSecond);

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

    return (OK);
    }
#endif

#ifdef INCLUDE_TIMESTAMP
/**************************************************************************
*
* 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 */
    )
    {
    return (ERROR);
    }

/**************************************************************************
*
* 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)
	{
        sysTimestampRunning = TRUE;
	}
    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, ERROR if the timestamp timer cannot be disabled.
*
* SEE ALSO: sysTimestampEnable()
*/

STATUS sysTimestampDisable (void)
    {
    if (sysTimestampRunning)
	{
	sysTimestampRunning = FALSE;
	}
    return (ERROR);
    }

/**************************************************************************
*
* 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 (sysClockTimerRollOver);
    }

/**************************************************************************
*
* 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 (_busClockRate);
    }

/**************************************************************************
*
* 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)
    {
    UINT32 ticks = 0;

    if (sysTimestampRunning)
    {
    /* Read the timer counter register */
    ticks = sysRead_TCR0 ();
    }

    /* return the timestamp timer tick count here */
    return (ticks);
    }

/**************************************************************************
*
* 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)
    {
    int locKey;
    UINT32 ticks = 0;

    if (sysTimestampRunning)
    {
    /* Lock Interrupts */
    locKey = intLock();

    /* Read the timer counter register */
    ticks = sysRead_TCR0 ();

    /* UnLock Interrupts */
    intUnlock (locKey);
    }

    /* return the timestamp timer tick count here */
    return (ticks);
    }
#endif   /* INCLUDE_TIMESTAMP */