lpc2210timer.c

这是别人发的LPC2210的BSP

/* lpc2210Timer.c - Samsung S3C44B0X timer library */

#include "copyright_wrs.h"

/* includes */

#include "vxWorks.h"
#include "config.h"
#include "drv/timer/timerDev.h"
#include "drv/timer/timestampDev.h"
#include "lpc2210Timer.h"

/* defines */

/* The default is to assume memory mapped I/O */

/* locals */

LOCAL FUNCPTR sysClkRoutine    = NULL; /* routine to call on clock tick */
LOCAL int sysClkArg            = (int)NULL; /* its argument */
LOCAL int sysClkRunning        = FALSE;
LOCAL int sysClkConnected      = FALSE;
LOCAL int sysClkTicksPerSecond = 100;

LOCAL FUNCPTR sysAuxClkRoutine    = NULL;
LOCAL int sysAuxClkArg            = (int)NULL;
LOCAL int sysAuxClkRunning        = FALSE;
LOCAL int sysAuxClkTicksPerSecond = 100;
LOCAL int sysAuxClkTicks;



#ifdef INCLUDE_TIMESTAMP

LOCAL BOOL      sysTimestampRunning     = FALSE;         /* running flag */
LOCAL FUNCPTR   sysTimestampRoutine     = NULL;          /* routine to call on intr */
LOCAL int       sysTimestampArg         = 0;             /* arg for routine */
void      sysTimestampInt (void);                  /* forward declaration */

#endif  /* INCLUDE_TIMESTAMP */

void SysClearClockInterrupt()
{
    T0IR = 1;
}

/*******************************************************************************
*
* sysClkInt - interrupt level processing for system clock
*
* This routine handles a system clock interrupt.  It acknowledges the
* interrupt and calls the routine installed by sysClkConnect().
*/

void sysClkInt (void)
{
    /* call system clock service routine */
    if (sysClkRoutine != NULL)
        (* sysClkRoutine) (sysClkArg);
}


/*******************************************************************************
*
* sysClkConnect - connect a routine to the system clock interrupt
*
* This routine specifies the interrupt service routine to be called at each
* clock interrupt.  Normally, it is called from usrRoot() in usrConfig.c to 
* connect usrClock() to the system clock interrupt.
*
* RETURN: OK, or ERROR if the routine cannot be connected to the interrupt.
*
* SEE ALSO: intConnect(), usrClock(), sysClkEnable()
*/
STATUS sysClkConnect
    (
    FUNCPTR routine,    /* routine to be called at each clock interrupt */
    int arg        /* argument with which to call routine */
    )
{
    if (sysClkConnected == FALSE)
    {
        T0MCR = 0x03;		   						/* 匹配通道0匹配中断并复位T0TC */
        T0TCR = 0x02;		   						/* 复位T0TC */
        sysHwInit2 ();
        sysClkConnected = TRUE;
    }

    sysClkRoutine   = NULL;
    sysClkArg        = arg;
    sysClkRoutine = routine;

    return (OK);
}


/*******************************************************************************
*
* sysClkDisable - turn off system clock interrupts
*
* This routine disables system clock interrupts.
*
* RETURNS: N/A
*
* SEE ALSO: sysClkEnable()
*/

void sysClkDisable (void)
{

    /*int oier;*/	/*  : deleted */
    
    if (sysClkRunning)
    {
        T0TCR = 0x02;
        sysClkRunning = FALSE;
    }
}


/*******************************************************************************
*
* sysClkEnable - turn on system clock interrupts
*
* This routine enables system clock interrupts.
*
* RETURNS: N/A
*
* SEE ALSO: sysClkConnect(), sysClkDisable(), sysClkRateSet()
*/

void sysClkEnable (void)
{
    /*UINT32 oier;*/	/*  : deleted */

    if (!sysClkRunning)
    {
        T0TCR = 0x01;
        sysClkRunning = TRUE;
    }
}


/*******************************************************************************
*
* sysClkRateGet - get the system clock rate
*
* This routine returns the system clock rate.
*
* RETURNS: The number of ticks per second of the system clock.
*
* SEE ALSO: sysClkEnable(), sysClkRateSet()
*/

int sysClkRateGet (void)
{
    return (sysClkTicksPerSecond);
}


/*******************************************************************************
*
* sysClkRateSet - set the system clock rate
*
* This routine sets the interrupt rate of the system clock.
* It is called by usrRoot() in usrConfig.c.
*
* RETURNS: OK, or ERROR if the tick rate is invalid or the timer cannot be set.
*
* SEE ALSO: sysClkEnable(), sysClkRateGet()
*/

STATUS sysClkRateSet
    (
    int ticksPerSecond        /* number of clock interrupts per second */
    )
{
    if (ticksPerSecond < SYS_CLK_RATE_MIN || ticksPerSecond > SYS_CLK_RATE_MAX)
        return (ERROR);

    sysClkTicksPerSecond = 100;
    T0MR0 = 110592;	    						/* 比较值(1S定时值) */
    T0PR = 99;			    					/* 设置定时器0分频为100分频，得110592Hz */
    
    if (sysClkRunning)
    {
        sysClkDisable ();
        sysClkEnable ();
    }

    return (OK);
}

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

#if ((CPU_FAMILY == ARM) && ARM_THUMB)
    /* set b0 so that sysClkConnect() can be used from shell */
    sysAuxClkRoutine = (FUNCPTR)((UINT32)routine | 1);
#else
    sysAuxClkRoutine = routine;
#endif /* CPU_FAMILY == ARM */

    return (OK);
    }

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

void sysAuxClkDisable (void)
    {
    /*UINT32 oier;*/		/*  : deleted */
    
    if (sysAuxClkRunning)
    {
#if 0
        /* disable timer interrupt in the timer */
		/*  : deleted */
        /*SNGKS32C_TIMER_REG_READ (SNGKS32C_TIMER_TMOD, oier);*/
        /*SNGKS32C_TIMER_REG_WRITE (SNGKS32C_TIMER_TMOD, oier & ~(1 << 3));*/

        /* disable timer interrupt in the interrupt controller */

        SNGKS32C_TIMER_INT_DISABLE (AUX_TIMER_INT_LVL);
#endif
        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)
    {
    /*UINT32 oier;*/	/*  : deleted */
    static BOOL connected = FALSE;

    if (!connected)
        {
        intConnect (INUM_TO_IVEC (INT_LVL_TIMER1), sysAuxClkInt, 0);
        connected = TRUE;
        }

    if (!sysAuxClkRunning)
        {
        /*
         * Calculate the number of ticks of the timer clock that this
         * period requires.  Do this once, here, so that the timer interrupt
         * routine does not need to perform a division.
         */

        sysAuxClkTicks = (AUX_TIMER_CLK / sysAuxClkTicksPerSecond);
#if 0
        /*
         * Load the match register with a new value calculated by
         * adding the ticks per interrupt to the current value of the
         * counter register.  Note that this may wraparound to a value
         * less than the current counter value but that's OK.
         */
		/*  : deleted */
        /*SNGKS32C_TIMER_REG_WRITE (SNGKS32C_TIMER_TDATA_1, sysAuxClkTicks);*/

        /* enable timer 1 */
		/*  : deleted */
        /*SNGKS32C_TIMER_REG_READ (SNGKS32C_TIMER_TMOD, oier);*/
        /*SNGKS32C_TIMER_REG_WRITE (SNGKS32C_TIMER_TMOD, oier | 8);*/

        /* enable clock interrupt in interrupt controller */
        SNGKS32C_TIMER_INT_ENABLE (AUX_TIMER_INT_LVL);
#endif
        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);
    }

#ifdef  INCLUDE_TIMESTAMP

/*******************************************************************************
*
* 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()
*/

void sysTimestampInt (void)
    {
    if (sysTimestampRunning && sysTimestampRoutine != NULL)
        (*sysTimestampRoutine)(sysTimestampArg);
    }

/*******************************************************************************
*
* sysTimestampConnect - connect a user routine to the timestamp timer interrupt
*
* This routine specifies the user interrupt routine to be called at each
* timestamp timer interrupt.  It does not enable the timestamp timer itself.
*
* RETURNS: OK, or ERROR if sysTimestampInt() interrupt handler is not used.
*/

STATUS sysTimestampConnect
    (
    FUNCPTR routine,    /* routine called at each timestamp timer interrupt */
    int arg     /* argument with which to call routine */
    )
    {
    return ERROR;    /* System clock tick specifies a rollover event */
    }

/*******************************************************************************
*
* sysTimestampEnable - initialize and enable the timestamp timer
*
* This routine connects the timestamp timer interrupt and initializes the
* counter registers.  If the timestamp timer is already running, this routine
* merely resets the timer counter.
*
* The rate of the timestamp timer should be set explicitly within the BSP,
* in the sysHwInit() routine.  This routine does not initialize the timer
* rate.
*
* RETURNS: OK, or ERROR if hardware cannot be enabled.
*/

STATUS sysTimestampEnable (void)
    {

    if (!sysTimestampRunning)
        {
        sysTimestampRunning = TRUE;
        }

    sysClkEnable();    /* make sure that system clock is running */

    return (OK);
    }

/*******************************************************************************
*
* sysTimestampDisable - disable the timestamp timer
*
* This routine disables the timestamp timer.  Interrupts are not disabled,
* although the tick counter will not increment after the timestamp timer
* is disabled, thus interrupts will no longer be generated.
*
* RETURNS: OK, or ERROR if timer cannot be disabled.
*/

STATUS sysTimestampDisable (void)
    {
    if (sysTimestampRunning)
        sysTimestampRunning = FALSE;

    return (OK);
    }

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

UINT32 sysTimestampPeriod (void)
    {
    return (SYS_TIMER_CLK / sysClkTicksPerSecond);
    }

/*******************************************************************************
*
* sysTimestampFreq - get the timestamp timer clock frequency
*
* This routine returns the frequency of the timer clock, in ticks per second.
*
* RETURNS: The timestamp timer clock frequency, in ticks per second.
*/

UINT32 sysTimestampFreq (void)
    {
    return (SYS_TIMER_CLK);
    }

/*******************************************************************************
*
* sysTimestamp - get the 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 by the return of
* sysTimestampFreq().
*
* This routine should be called with interrupts locked.  If interrupts are
* not already locked, sysTimestampLock() should be used instead.
*
* RETURNS: The current timestamp timer tick count.
*
* SEE ALSO: sysTimestampLock()
*/

UINT32 sysTimestamp (void)
    {
    UINT32 count;
#if 0
    /*SNGKS32C_TIMER_REG_READ (SNGKS32C_TIMER_TCNT_0, count);*/
	/*  : deleted and added */
	SNGKS32C_TIMER_REG_READ (S3C44B0X_TCNTO0, count);
#endif	
    /* timer counts down to 0 from sysClkTicks load value */
    return (sysTimestampPeriod() - count);
    }

/*******************************************************************************
*
* sysTimestampLock - get the 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 by the return of
* sysTimestampFreq().
*
* This routine locks interrupts for cases where it is necessary to stop the
* tick counter in order to read it, or when two independent counters must
* be read.  If interrupts are already locked, sysTimestamp() should be
* used instead.
*
* RETURNS: The current timestamp timer tick count.
*
* SEE ALSO: sysTimestamp()
*/

UINT32 sysTimestampLock (void)
    {
    UINT32 result;

    result = sysTimestamp ();

    return (result);
    }

#endif  /* INCLUDE_TIMESTAMP */