xtouchscreen_intr.c

基于powerPC405处理器的触摸显示屏驱动程序

/*-----------------------------------------------------------------------------
*     $Date: 2004/01/05 16:58:54 $
*     $RCSfile: xtouchscreen_intr.c,v $
*----------------------------------------------------------------------------*/

/*****************************************************************************
*
*     XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS"
*     SOLELY FOR USE IN DEVELOPING PROGRAMS AND SOLUTIONS FOR
*     XILINX DEVICES.  BY PROVIDING THIS DESIGN, CODE, OR INFORMATION
*     AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE, APPLICATION
*     OR STANDARD, XILINX IS MAKING NO REPRESENTATION THAT THIS
*     IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT,
*     AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE
*     FOR YOUR IMPLEMENTATION.  XILINX EXPRESSLY DISCLAIMS ANY
*     WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE
*     IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR
*     REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF
*     INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
*     FOR A PARTICULAR PURPOSE.
*     
*     (c) Copyright 2004 Xilinx, Inc.
*     All rights reserved.
*
*****************************************************************************/
/****************************************************************************/
/**
*
* @file xtouchscreen_intr.c
*
* This file contains the functions that are related to interrupt processing
* for the touchscreen driver.
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver   Who  Date     Changes
* ----- ---- -------- -----------------------------------------------
* 1.00a ch   08/15/02 First release
* </pre>
*
*****************************************************************************/

/***************************** Include Files ********************************/

#include "xio.h"
#include "xtouchscreen.h"
#include "xtouchscreen_l.h"

/************************** Constant Definitions ****************************/

/**************************** Type Definitions ******************************/

/***************** Macros (Inline Functions) Definitions ********************/

/************************** Variable Definitions ****************************/

typedef void (*Handler)(XTouchscreen *InstancePtr);

/************************** Function Prototypes *****************************/

/****************************************************************************/
/**
*
* This function sets the handler that will be called when an event (interrupt)
* occurs in the driver. The purpose of the handler is to allow application
* specific processing to be performed.
*
* @param    InstancePtr is a pointer to the XTouchscreen instance to be 
*           worked on.
* @param    FuncPtr is the pointer to the callback function.
* @param    CallBackRef is the upper layer callback reference passed back when
*           the callback function is invoked.
*
* @return
*
* None.
*
* @notes
*
* There is no assert on the CallBackRef since the driver doesn't know what it
* is (nor should it)
*
*****************************************************************************/
void XTouchscreen_SetHandler(XTouchscreen *InstancePtr, 
                             XTouchscreen_Handler FuncPtr, 
                             void *CallBackRef)
{
    /*
     * Assert validates the input arguments
     * CallBackRef not checked, no way to know what is valid
     */
    XASSERT_VOID(InstancePtr != XNULL);
    XASSERT_VOID(FuncPtr != XNULL);
    XASSERT_VOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);

    InstancePtr->Handler = FuncPtr;
    InstancePtr->CallBackRef = CallBackRef;
}

/****************************************************************************/
/**
*
* This function is the interrupt handler for the Touchscreen driver.
* It must be connected to an interrupt system by the user such that it is
* called when an interrupt for any PS/2 port occurs. This function does 
* not save or restore the processor context such that the user must
* ensure this occurs.
*
* @param    InstancePtr contains a pointer to the Touchscreen instance.
*
* @return
*
* None.
*
* @note
*
* None.
*
******************************************************************************/
void XTouchscreen_InterruptHandler(XTouchscreen *InstancePtr)
{
    Xuint8 IntrStatus;
 //   Xuint32 x,y,z;
    

    XASSERT_VOID(InstancePtr != XNULL);

    /*
     * Read the interrupt status register to determine which
     * interrupt is active
     */
    IntrStatus = XTouchscreen_mGetIntrStatus(InstancePtr->BaseAddress);

    if (IntrStatus & XTOUCHSCREEN_INT_PEN_DOWN)
    {
        /*
         * Check if the pen is alreay down. This is done for debouncing
         */
        if (!(InstancePtr->CurrentState == XTOUCHSCREEN_STATE_PEN_DOWN))
        {
            /*
             * Call the application handler
             */
            InstancePtr->Handler(InstancePtr->CallBackRef, 
                                 XTOUCHSCREEN_EVENT_PEN_DOWN,
                                 0);
	}
        /*
         * Save the current state
         */
        InstancePtr->CurrentState = XTOUCHSCREEN_STATE_PEN_DOWN;

        XTouchscreen_mClearIntr(InstancePtr->BaseAddress, 
                                 XTOUCHSCREEN_INT_PEN_DOWN);
    }

    if (IntrStatus & XTOUCHSCREEN_INT_PEN_UP)
    {
        /*
         * Check if the pen is alreay up. This is done for debouncing
         */
        if (!(InstancePtr->CurrentState == XTOUCHSCREEN_STATE_PEN_UP))
        {
            /*
             * Call the application handler
             */
            InstancePtr->Handler(InstancePtr->CallBackRef,
                                 XTOUCHSCREEN_EVENT_PEN_UP,
                                 0);
	}
        /*
         * Save the current pen state
         */
        InstancePtr->CurrentState = XTOUCHSCREEN_STATE_PEN_UP;

        XTouchscreen_mClearIntr(InstancePtr->BaseAddress, XTOUCHSCREEN_INT_PEN_UP);
    }
}