xintc.c

基于Xilinx-XUPV2P开发平台的嵌入式系统实验例程：实验6系统验证与调试

* @param    InstancePtr is a pointer to the XIntc instance to be worked on.
* @param    Id contains the ID of the interrupt source and should be in the
*           range of 0 to XPAR_INTC_MAX_NUM_INTR_INPUTS - 1 with 0 being the
*           highest priority interrupt.
* @param    Handler to the handler for that interrupt.
* @param    CallBackRef is the callback reference, usually the instance pointer
*           of the connecting driver.
*
* @return
*
* - XST_SUCCESS if the handler was connected correctly.
*
* @note
*
* WARNING: The handler provided as an argument will overwrite any handler
* that was previously connected.
*
****************************************************************************/
XStatus XIntc_Connect(XIntc *InstancePtr, Xuint8 Id,
                      XInterruptHandler Handler, void *CallBackRef)
{
    /*
     * assert the arguments
     */
    XASSERT_NONVOID(InstancePtr != XNULL);
    XASSERT_NONVOID(Id < XPAR_INTC_MAX_NUM_INTR_INPUTS);
    XASSERT_NONVOID(Handler != XNULL);
    XASSERT_NONVOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);

    /*
     * the Id is used as an index into the table to select the proper handler
     */

    InstancePtr->CfgPtr->HandlerTable[Id].Handler = Handler;
    InstancePtr->CfgPtr->HandlerTable[Id].CallBackRef = CallBackRef;

    return XST_SUCCESS;
}

/*****************************************************************************/
/**
*
* Updates the interrupt table with the Null Handler and XNULL arguments at the
* location pointed at by the Id. This effectively disconnects that interrupt
* source from any handler. The interrupt is disabled also.
*
* @param    InstancePtr is a pointer to the XIntc instance to be worked on.
* @param    Id contains the ID of the interrupt source and should be in the
*           range of 0 to XPAR_INTC_MAX_NUM_INTR_INPUTS - 1 with 0 being the
*           highest priority interrupt.
*
* @return
*
* None.
*
* @note
*
* None.
*
****************************************************************************/
void XIntc_Disconnect(XIntc *InstancePtr, Xuint8 Id)
{
    Xuint32 CurrentIER;
    Xuint32 Mask;

    /*
     * assert the arguments
     */
    XASSERT_VOID(InstancePtr != XNULL);
    XASSERT_VOID(Id < XPAR_INTC_MAX_NUM_INTR_INPUTS);
    XASSERT_VOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);

    /* disable the interrupt such that it won't occur while disconnecting
     * the handler, only disable the specified interrupt id without modifying
     * the other interrupt ids
     */
    CurrentIER = XIntc_In32(InstancePtr->BaseAddress + XIN_IER_OFFSET);

    Mask = XIntc_BitPosMask[Id];      /* convert from integer id to bit mask */

    XIntc_Out32(InstancePtr->BaseAddress + XIN_IER_OFFSET,
              (CurrentIER & ~Mask));

    /* disconnect the handler and connect a stub, the callback reference
     * must be set to this instance to allow unhandled interrupts to be
     * tracked
     */
    InstancePtr->CfgPtr->HandlerTable[Id].Handler = StubHandler;
    InstancePtr->CfgPtr->HandlerTable[Id].CallBackRef = InstancePtr;
}

/*****************************************************************************/
/**
*
* Enables the interrupt source provided as the argument Id. Any pending
* interrupt condition for the specified Id will occur after this function is
* called.
*
* @param    InstancePtr is a pointer to the XIntc instance to be worked on.
* @param    Id contains the ID of the interrupt source and should be in the
*           range of 0 to XPAR_INTC_MAX_NUM_INTR_INPUTS - 1 with 0 being the
*           highest priority interrupt.
*
* @return
*
* None.
*
* @note
*
* None.
*
****************************************************************************/
void XIntc_Enable(XIntc *InstancePtr, Xuint8 Id)
{
    Xuint32 CurrentIER;
    Xuint32 Mask;

    /*
     * assert the arguments
     */
    XASSERT_VOID(InstancePtr != XNULL);
    XASSERT_VOID(Id < XPAR_INTC_MAX_NUM_INTR_INPUTS);
    XASSERT_VOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);

    /*
     * the Id is used to create the appropriate mask for the
     * desired bit position. Id currently limited to 0 - 31
     */
    Mask = XIntc_BitPosMask[Id];

    /*
     * enable the selected interrupt source by reading the interrupt enable
     * register and then modifying only the specified interrupt id enable
     */

    CurrentIER = XIntc_In32(InstancePtr->BaseAddress + XIN_IER_OFFSET);

    XIntc_Out32(InstancePtr->BaseAddress + XIN_IER_OFFSET,
              (CurrentIER | Mask));
}

/*****************************************************************************/
/**
*
* Disables the interrupt source provided as the argument Id such that the
* interrupt controller will not cause interrupts for the specified Id. The
* interrupt controller will continue to hold an interrupt condition for the
* Id, but will not cause an interrupt.
*
* @param    InstancePtr is a pointer to the XIntc instance to be worked on.
* @param    Id contains the ID of the interrupt source and should be in the
*           range of 0 to XPAR_INTC_MAX_NUM_INTR_INPUTS - 1 with 0 being the
*           highest priority interrupt.
*
* @return
*
* None.
*
* @note
*
* None.
*
****************************************************************************/
void XIntc_Disable(XIntc *InstancePtr, Xuint8 Id)
{
    Xuint32 CurrentIER;
    Xuint32 Mask;

    /*
     * assert the arguments
     */
    XASSERT_VOID(InstancePtr != XNULL);
    XASSERT_VOID(Id < XPAR_INTC_MAX_NUM_INTR_INPUTS);
    XASSERT_VOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);

    /*
     * the Id is used to create the appropriate mask for the
     * desired bit position. Id currently limited to 0 - 31
     */

    Mask = XIntc_BitPosMask[Id];

    /*
     * disable the selected interrupt source by reading the interrupt enable
     * register and then modifying only the specified interrupt id
     */

    CurrentIER = XIntc_In32(InstancePtr->BaseAddress + XIN_IER_OFFSET);

    XIntc_Out32(InstancePtr->BaseAddress + XIN_IER_OFFSET,
              (CurrentIER & ~Mask));
}

/*****************************************************************************/
/**
*
* Acknowledges the interrupt source provided as the argument Id. When the
* interrupt is acknowledged, it causes the interrupt controller to clear its
* interrupt condition.
*
* @param    InstancePtr is a pointer to the XIntc instance to be worked on.
* @param    Id contains the ID of the interrupt source and should be in the
*           range of 0 to XPAR_INTC_MAX_NUM_INTR_INPUTS - 1 with 0 being the
*           highest priority interrupt.
*
* @return
*
* None.
*
* @note
*
* None.
*
****************************************************************************/
void XIntc_Acknowledge(XIntc *InstancePtr, Xuint8 Id)
{
    Xuint32 Mask;

    /*
     * assert the arguments
     */
    XASSERT_VOID(InstancePtr != XNULL);
    XASSERT_VOID(Id < XPAR_INTC_MAX_NUM_INTR_INPUTS);
    XASSERT_VOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);

    /*
     * the Id is used to create the appropriate mask for the
     * desired bit position. Id currently limited to 0 - 31
     */
    Mask = XIntc_BitPosMask[Id];

    /*
     * acknowledge the selected interrupt source, no read of the acknowledge
     * register is necessary since only the bits set in the mask will be
     * affected by the write
     */
    XIntc_Out32(InstancePtr->BaseAddress + XIN_IAR_OFFSET, Mask);
}

/*****************************************************************************/
/**
*
* A stub for the asynchronous callback. The stub is here in case the upper
* layers forget to set the handler.
*
* @param    CallBackRef is a pointer to the upper layer callback reference
*
* @return
*
* None.
*
* @note
*
* None.
*
******************************************************************************/
static void StubHandler(void *CallBackRef)
{
    /*
     * verify that the inputs are valid
     */
    XASSERT_VOID(CallBackRef != XNULL);

    /*
     * indicate another unhandled interrupt for stats
     */
    ((XIntc *)CallBackRef)->UnhandledInterrupts++;
}

/*****************************************************************************/
/**
*
* Looks up the device configuration based on the unique device ID. A table
* contains the configuration info for each device in the system.
*
* @param    DeviceId is the unique identifier for a device.
*
* @return
*
* A pointer to the XIntc configuration structure for the specified device, or
* XNULL if the device was not found.
*
* @note
*
* None.
*
******************************************************************************/
XIntc_Config *XIntc_LookupConfig(Xuint16 DeviceId)
{
    XIntc_Config *CfgPtr = XNULL;
    int i;

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

    return CfgPtr;
}