autimer.c

au1500开发的应用程序

            {
            if (count++ > OSC_TIMEOUT)
                {
                return (ERROR);
                }
             }
        }
    else if (pollvalue == 1)
        {
        while (!(AU_RTC_CONTROL_REG & bit)) /* wait for bit=1 */
            {
            if (count++ > OSC_TIMEOUT)
                {
                return (ERROR);
                }
             }
        }
    return (OK);
    }

/*****************************************************************************
*
* sysAuxClkConfig - Set up RTC device.
*
* This routine enables auxiliary clock oscillator.
* Set up oscillator divider (trim register), and initial value of auxiliary
* clock counter (write register). At the end it enables RTC counter, but
* leaves auxiliary clock disable.
*
* RETURNS: N/A
*
* SEE ALSO: sysAuxClkEnable()
*/

void sysAuxClkConfig (void)
    {
    /* configure RTC match2 interrupt as rising edge */

    AU_INTC_CONFIG2_CLEAR(0) = (1 << 21);
    AU_INTC_CONFIG1_CLEAR(0) = (1 << 21);
    AU_INTC_CONFIG0_SET(0) = (1 << 21);
    sysWbFlush();

    /* set trim to 0(divider is 1) */

    AU_RTC_CONTROL_REG |= AU_SYS_COUNTER_CONTROL_BRT;
    sysWbFlush();
    AU_RTC_TRIM_REG = 0;
    sysWbFlush();

    /* normal operation, using trim */

    AU_RTC_CONTROL_REG &= ~AU_SYS_COUNTER_CONTROL_BRT;
    sysWbFlush();

    /* enable RTC block, query RTS bit before writing */

    sysRtcControlPoll (AU_SYS_COUNTER_CONTROL_ERS, 0);
    AU_RTC_CONTROL_REG |= AU_SYS_COUNTER_CONTROL_REN;
    sysWbFlush();

    /* initialize counter(write register) to 0, query RS before writing */

    sysRtcControlPoll (AU_SYS_COUNTER_CONTROL_RS, 0);
    AU_RTC_WRITE_REG = 0;
    sysWbFlush();
    sysRtcControlPoll (AU_SYS_COUNTER_CONTROL_RS, 0);

    }

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

void sysAuxClkEnable (void)
    {

    /* set RTC match2, query RM2 before writing */

    sysRtcControlPoll (AU_SYS_COUNTER_CONTROL_RM2, 0);
    AU_RTC_MATCH_2_REG = PERIOD(auxClkTicksPerSecond);
    sysWbFlush();

    /* adjust counter */

    AU_RTC_WRITE_REG = TIMER_WRITE_DELAY;
    sysWbFlush();

    /* enable interrupts */

    AU_INTC_MASK_SET(0) = (1 << 21);
    sysWbFlush();
    
    auxClkRunning = 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: 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.  Normally, it is called by usrRoot() in
* usrConfig.c.
*
* NOTE: The Au internal RTC timer is used to provide the auxiliary clock.
*
* RETURNS: OK, or ERROR if the tick rate is invalid or the timer cannot be
* set.
*
* SEE ALSO: sysAuxClkDisable(), sysAuxClkEnable(), sysAuxClkRateGet()
*/

STATUS sysAuxClkRateSet
    (
    int ticksPerSecond  /* number of clock interrupts per second */
    )
    {
    /* parameter checking */

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

    auxClkTicksPerSecond = ticksPerSecond;

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

    return (OK);
    }

/*****************************************************************************
*
* sysAuxClkInt - handle a auxiliary clock interrupt
*
* This routine handles a auxiliary clock interrupt.  It increments the value
* on the front panel display and calls the routine installed by
* sysAuxClkConnect().
*
* RETURNS: N/A
*/

void sysAuxClkInt (void)
    {

    /* mask interrupt 21 */

    AU_INTC_MASK_CLEAR(0) = (1 << 21);
    sysWbFlush();

    /* clear pending bit */

    AU_INTC_RISING_EDGE_CLEAR (0) = (1 << 21);
    sysWbFlush();

    /* adjust counter */

    AU_RTC_WRITE_REG = TIMER_WRITE_DELAY;
    sysWbFlush();
    sysRtcControlPoll (AU_SYS_COUNTER_CONTROL_RS, 0);

    /* enable interrupt */

    AU_INTC_MASK_SET(0) = (1 << 21);
    sysWbFlush();

    /* execute connected routine */

    if (sysAuxClkRoutine != NULL)
        {
            (*sysAuxClkRoutine) (sysAuxClkArg);
        }

    }

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

STATUS sysAuxClkConnect
    (
    FUNCPTR routine,    /* routine called at each auxiliary clock interrupt */
    int arg             /* argument with which to call routine           */
    )
    {
    if (auxClkConnected == FALSE)
        {
        auxClkConnected = TRUE;
        }

    sysAuxClkRoutine   = routine;
    sysAuxClkArg       = arg;

    return (OK);
    }

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

void sysAuxClkDisable (void)
    {
    if (auxClkRunning)
        {
        AU_INTC_MASK_CLEAR(0) = (1 << 21);
        sysWbFlush();

        auxClkRunning = FALSE;
        }
    }

#endif  /* INCLUDE_AUX_CLK */

/*******************************************************************************
*
* sysTimestampInt - timestamp timer interrupt handler
*
* This rountine 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)
    {
    sysCompareSet (0);

    /* we cannot disable interrupts so we do this instead */

    sysCountSet (1);
    sysCompareSet (TIMER_ROLL_OVER);

#ifdef INCLUDE_TIMESTAMP
    if ((sysTimestampRunning == TRUE) & (sysTimestampRoutine != NULL))
             (*sysTimestampRoutine) (sysTimestampArg);
#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, always.
*/

STATUS sysTimestampConnect
    (
    FUNCPTR routine,    /* routine called at each timestamp timer interrupt */
    int arg             /* argument with which to call routine */
    )
    {
    sysTimestampRoutine = routine;
    sysTimestampArg = arg;
    return (OK);
    }

/*******************************************************************************
*
* sysTimestampEnable - enable a timestamp timer interrupt
*
* This routine enables timestamp timer interrupts and resets the counter.
*
* RETURNS: OK, always.
*
* SEE ALSO: sysTimestampDisable()
*/

STATUS sysTimestampEnable (void)
   {
   sysCompareSet (TIMER_ROLL_OVER);
   sysCountSet (0);
   sysTimestampRunning = TRUE;

   return (OK);
   }

/*******************************************************************************
*
* sysTimestampDisable - disable a timestamp timer interrupt
*
* This routine disables timestamp timer interrupts.
*
* RETURNS: OK, always.
*
* SEE ALSO: sysTimestampEnable()
*/

STATUS sysTimestampDisable (void)
    {
    if (sysTimestampRunning)
        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)
    {
    /*
     * The period of the timestamp depends on the clock rate of the on-chip
     * timer.
     */

    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 (CPU_CLOCK_RATE);
    }

/*******************************************************************************
*
* 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)
    {
    return (sysCountGet());
    }

/*******************************************************************************
*
* 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)
    {
    return(sysCountGet());
    }

#endif  /* INCLUDE_TIMESTAMP */