xtmrctr.c

ucos_ii 在microblaze平台上的移植

******************************************************************************/
void XTmrCtr_Stop(XTmrCtr *InstancePtr, Xuint8 TmrCtrNumber)
{
    Xuint32 ControlStatusReg;

    XASSERT_VOID(InstancePtr != XNULL);
    XASSERT_VOID(TmrCtrNumber < XTC_DEVICE_TIMER_COUNT);
    XASSERT_VOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);

    /*
     * read the current register contents
     */
    ControlStatusReg = XTimerCtr_mReadReg(InstancePtr->BaseAddress,
                                          TmrCtrNumber, XTC_TCSR_OFFSET);
    /*
     * disable the timer counter such that it's not running
     */
    ControlStatusReg &= ~(XTC_CSR_ENABLE_TMR_MASK);

    /*
     * write out the updated value to the actual register and indicate the
     *
     */
    XTmrCtr_mWriteReg(InstancePtr->BaseAddress, TmrCtrNumber,
                      XTC_TCSR_OFFSET, ControlStatusReg);
}

/*****************************************************************************/
/**
*
* Get the current value of the specified timer counter.  The timer counter
* may be either incrementing or decrementing based upon the current mode of
* operation.
*
* @param    InstancePtr is a pointer to the XTmrCtr instance to be worked on.
* @param    TmrCtrNumber is the timer counter of the device to operate on.
*           Each device may contain multiple timer counters. The timer number
*           is a zero based number  with a range of
*           0 - (XTC_DEVICE_TIMER_COUNT - 1).
*
* @return
*
* The current value for the timer counter.
*
* @note
*
* None.
*
******************************************************************************/
Xuint32 XTmrCtr_GetValue(XTmrCtr *InstancePtr, Xuint8 TmrCtrNumber)
{

    XASSERT_NONVOID(InstancePtr != XNULL);
    XASSERT_NONVOID(TmrCtrNumber < XTC_DEVICE_TIMER_COUNT);
    XASSERT_NONVOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);

    return XTimerCtr_mReadReg(InstancePtr->BaseAddress,
                              TmrCtrNumber, XTC_TCR_OFFSET);
}

/*****************************************************************************/
/**
*
* Set the reset value for the specified timer counter. This is the value
* that is loaded into the timer counter when it is reset. This value is also
* loaded when the timer counter is started.
*
* @param    InstancePtr is a pointer to the XTmrCtr instance to be worked on.
* @param    TmrCtrNumber is the timer counter of the device to operate on.
*           Each device may contain multiple timer counters. The timer number
*           is a zero based number with a range of
*           0 - (XTC_DEVICE_TIMER_COUNT - 1).
* @param    ResetValue contains the value to be used to reset the timer counter.
*
* @return
*
* None.
*
* @note
*
* None.
*
******************************************************************************/
void XTmrCtr_SetResetValue(XTmrCtr *InstancePtr, Xuint8 TmrCtrNumber,
                           Xuint32 ResetValue)
{

    XASSERT_VOID(InstancePtr != XNULL);
    XASSERT_VOID(TmrCtrNumber < XTC_DEVICE_TIMER_COUNT);
    XASSERT_VOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);



    XTmrCtr_mWriteReg(InstancePtr->BaseAddress, TmrCtrNumber,
                      XTC_TLR_OFFSET, ResetValue);
}

/*****************************************************************************/
/**
*
* Returns the timer counter value that was captured the last time the external
* capture input was asserted.
*
* @param    InstancePtr is a pointer to the XTmrCtr instance to be worked on.
* @param    TmrCtrNumber is the timer counter of the device to operate on.
*           Each device may contain multiple timer counters. The timer number
*           is a zero based number with a range of
*           0 - (XTC_DEVICE_TIMER_COUNT - 1).
*
* @return
*
* The current capture value for the indicated timer counter.
*
* @note
*
* None.
*
*******************************************************************************/
Xuint32 XTmrCtr_GetCaptureValue(XTmrCtr *InstancePtr, Xuint8 TmrCtrNumber)
{

    XASSERT_NONVOID(InstancePtr != XNULL);
    XASSERT_NONVOID(TmrCtrNumber < XTC_DEVICE_TIMER_COUNT);
    XASSERT_NONVOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);

    return XTimerCtr_mReadReg(InstancePtr->BaseAddress,
                              TmrCtrNumber, XTC_TLR_OFFSET);
}

/*****************************************************************************/
/**
*
* Resets the specified timer counter of the device. A reset causes the timer
* counter to set it's value to the reset value.
*
* @param    InstancePtr is a pointer to the XTmrCtr instance to be worked on.
* @param    TmrCtrNumber is the timer counter of the device to operate on.
*           Each device may contain multiple timer counters. The timer number
*           is a zero based number with a range of
*           0 - (XTC_DEVICE_TIMER_COUNT - 1).
*
* @return
*
* None.
*
* @note
*
* None.
*
******************************************************************************/
void XTmrCtr_Reset(XTmrCtr *InstancePtr, Xuint8 TmrCtrNumber)
{
    Xuint32 CounterControlReg;

    XASSERT_VOID(InstancePtr != XNULL);
    XASSERT_VOID(TmrCtrNumber < XTC_DEVICE_TIMER_COUNT);
    XASSERT_VOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);

    /*
     * read current contents of the register so it won't be destroyed
     */
    CounterControlReg = XTimerCtr_mReadReg(InstancePtr->BaseAddress,
                                           TmrCtrNumber, XTC_TCSR_OFFSET);
    /*
     * reset the timer by toggling the reset bit in the register
     */
    XTmrCtr_mWriteReg(InstancePtr->BaseAddress, TmrCtrNumber, XTC_TCSR_OFFSET,
                      CounterControlReg | XTC_CSR_LOAD_MASK);

    XTmrCtr_mWriteReg(InstancePtr->BaseAddress, TmrCtrNumber,
                      XTC_TCSR_OFFSET, CounterControlReg);
}

/*****************************************************************************/
/**
*
* Checks if the specified timer counter of the device has expired. In capture
* mode, expired is defined as a capture occurred. In compare mode, expired is
* defined as the timer counter rolled over/under for up/down counting.
*
* When interrupts are enabled, the expiration causes an interrupt. This function
* is typically used to poll a timer counter to determine when it has expired.
*
* @param    InstancePtr is a pointer to the XTmrCtr instance to be worked on.
* @param    TmrCtrNumber is the timer counter of the device to operate on.
*           Each device may contain multiple timer counters. The timer number
*           is a zero based number with a range of
*           0 - (XTC_DEVICE_TIMER_COUNT - 1).
*
* @return
*
* XTRUE if the timer has expired, and XFALSE otherwise.
*
* @note
*
* None.
*
******************************************************************************/
Xboolean XTmrCtr_IsExpired(XTmrCtr *InstancePtr, Xuint8 TmrCtrNumber)
{
    Xuint32 CounterControlReg;

    XASSERT_NONVOID(InstancePtr != XNULL);
    XASSERT_NONVOID(TmrCtrNumber < XTC_DEVICE_TIMER_COUNT);
    XASSERT_NONVOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);

    /*
     * check if timer is expired
     */
    CounterControlReg = XTimerCtr_mReadReg(InstancePtr->BaseAddress,
                                           TmrCtrNumber, XTC_TCSR_OFFSET);

    return ((CounterControlReg & XTC_CSR_INT_OCCURED_MASK) ==
            XTC_CSR_INT_OCCURED_MASK);
}

/*****************************************************************************
*
* Looks up the device configuration based on the unique device ID. The table
* TmrCtrConfigTable contains the configuration info for each device in the
* system.
*
* @param DeviceId is the unique device ID to search for in the config table.
*
* @return
*
* A pointer to the configuration that matches the given device ID, or NULL if
* no match is found.
*
* @note
*
* None.
*
******************************************************************************/
XTmrCtr_Config *XTmrCtr_LookupConfig(Xuint16 DeviceId)
{
    XTmrCtr_Config *CfgPtr = XNULL;
    int i;

    for (i=0; i < XPAR_XTMRCTR_NUM_INSTANCES; i++)
    {
        if (XTmrCtr_ConfigTable[i].DeviceId == DeviceId)
        {
            CfgPtr = &XTmrCtr_ConfigTable[i];
            break;
        }
    }

    return CfgPtr;
}