{

        RETAILMSG(1,(TEXT('[KEY] For pGPIOregs: DrvLib_MapIoSpace failed!/r/n')));

        bResult = FALSE;

        goto CleanUp;

    } 

//禁止上下拉

pPublicKey->pGPIOregs->GPMPUD = 0x00000000;

//GPM0-GPM3設置成輸出

pPublicKey->pGPIOregs->GPMCON = 0x00001111;

//LED0-3熄滅

pPublicKey->pGPIOregs->GPMDAT = 0x0;

//設置EINT0中斷

//禁止GPN0和GPN1上下拉

pPublicKey->pGPIOregs->GPNPUD &= ~0x0F;

//GPN0-1設置成外中斷

pPublicKey->pGPIOregs->GPNCON |= 0x0a;

//使能外中斷EINT0-EINT1

pPublicKey->pGPIOregs->EINT0MASK &= ~0x3;

//EINT0-1下降沿觸發中斷

pPublicKey->pGPIOregs->EINT0CON0 |= 0x2;

    do

    {

        //Button1 Thread

pPublicKey->FlagExitThrd = FALSE;

        g_hEvent1 = CreateEvent(NULL, FALSE, FALSE, NULL);

g_SysIntr1 = SYSINTR_UNDEFINED;

dwHwIntr = IRQ_EINT0;

if (!KernelIoControl(IOCTL_HAL_REQUEST_SYSINTR, &dwHwIntr, sizeof(DWORD), &g_SysIntr1, sizeof(DWORD), NULL))

        {

            RETAILMSG(1,(TEXT('[KEY] Failed to request the KEY sysintr./n')));

            g_SysIntr1 = SYSINTR_UNDEFINED;

            bResult = FALSE;

            break;

        }

        if (!InterruptInitialize(g_SysIntr1, g_hEvent1, NULL, 0))

        {

            RETAILMSG(1,(TEXT('[KEY] KEY Interrupt Initialization failed!!!/n')));

            bResult = FALSE;

            break;

        }

g_hThread1 = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)Button1Thread, NULL, 0, NULL);

if (g_hThread1 == NULL)

        {

            RETAILMSG(1,(TEXT('[KEY] Key Button Thread creation error!!!/n')));

            bResult = FALSE;

            break;

        }

//Button2 Thread

g_hEvent2 = CreateEvent(NULL, FALSE, FALSE, NULL);

g_SysIntr2 = SYSINTR_UNDEFINED;

dwHwIntr = IRQ_EINT1;

if (!KernelIoControl(IOCTL_HAL_REQUEST_SYSINTR, &dwHwIntr, sizeof(DWORD), &g_SysIntr2, sizeof(DWORD), NULL))

        {

            RETAILMSG(1,(TEXT('[KEY] Failed to request the KEY sysintr./n')));

            g_SysIntr2 = SYSINTR_UNDEFINED;

            bResult = FALSE;

            break;

        }

        if (!InterruptInitialize(g_SysIntr2, g_hEvent2, NULL, 0))

        {

            RETAILMSG(1,(TEXT('[KEY] KEY Interrupt Initialization failed!!!/n')));

            bResult = FALSE;

            break;

        }

g_hThread2 = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)Button2Thread, NULL, 0, NULL);

if (g_hThread2 == NULL)

        {

            RETAILMSG(1,(TEXT('[KEY] Key Button2 Thread creation error!!!/n')));

            bResult = FALSE;

            break;

        }

    } while (0);

    RETAILMSG(1,(TEXT('--[KEY] KEY_Init Function/r/n')));

    if(bResult)

    {

        return pPublicKey;

    }

    else

    {

        return NULL;

    }

CleanUp:

    if (!bResult)

    {

        if (pPublicKey->pGPIOregs)

        {

            DrvLib_UnmapIoSpace((PVOID)pPublicKey->pGPIOregs);

            pPublicKey->pGPIOregs = NULL;

        }

return NULL;

}

}

DWORD KEY_Open(DWORD dwData, DWORD dwAccess, DWORD dwShareMode)

{

RETAILMSG(1, (TEXT('KEY_Open: KEY Device Open Successfully./r/n')));

    return(dwData);

}

BOOL KEY_Close(DWORD Handle)

{

RETAILMSG(1, (TEXT('KEY_Close: KEY Device Close Successfully./r/n')));

return (TRUE);

}

DWORD KEY_Read(DWORD Handle, LPVOID pBuffer, DWORD dwNumBytes)

{

UINT16 ch;

DWORD result;

RETAILMSG(1, (TEXT('KEY_Read: KEY Device Read Successfully./r/n')));

    ch = (UINT16)pPublicKey->pGPIOregs->GPNDAT;

if( (ch & Butt1Mask) != 0)

{

result = 1;

RETAILMSG(1, (TEXT('Button 1 pressed:/r/n')));

}

else if( (ch & Butt2Mask) != 0)

{

result = 2;

RETAILMSG(1, (TEXT('Button 2 pressed:/r/n')));

}

else

{

result = -1;

RETAILMSG(1, (TEXT('No Button pressed:/r/n')));

}

dwNumBytes = result;

    return (dwNumBytes);

}

DWORD KEY_Write(DWORD Handle, LPCVOID pBuffer, DWORD dwNumBytes)

{

RETAILMSG(1, (TEXT('BTN_Write:KEY Device Write Successfully./r/n')));

    return(TRUE);

}

DWORD KEY_Seek(DWORD Handle, long lDistance, DWORD dwMoveMethod)

{

    return (DWORD)-1;

}

void KEY_PowerDown(void)

{

    return;

}

void KEY_PowerUp(void)

{

return;

}

BOOL KEY_IOControl(DWORD hOpenContext,DWORD dwCode,PBYTE pBufIn,DWORD dwLenIn,PBYTE pBufOut,DWORD dwLenOut,PDWORD pdwActualOut)

{

RETAILMSG(1, (TEXT('BTN_IOControl:/r/n')));

    return(TRUE);

}

/*******************************************************************************

 *DLL入口函數

 *******************************************************************************/

BOOL

DllEntry(

    HINSTANCE   hinstDll,

    DWORD       dwReason,

    LPVOID      lpReserved

    )

{

    if ( dwReason == DLL_PROCESS_ATTACH )

    {

        DEBUGMSG (1, (TEXT('[MyKey] Process Attach/r/n')));

    }

    if ( dwReason == DLL_PROCESS_DETACH )

    {

        DEBUGMSG (1, (TEXT('[MyKey] Process Detach/r/n')));

    }

    return(TRUE);

}

3.編寫配置文件，包括如下文件sources，MyKey.def，makefile如下：

技巧：可以到其他驅動程序目錄下拷貝在加以修改

Sources：

RELEASETYPE=PLATFORM

PREPROCESSDEFFILE=1

TARGETNAME=MyKey

TARGETTYPE=DYNLINK

DEFFILE=MyKey.def

DLLENTRY=DllEntry

TARGETLIBS= /

    $(_PROJECTROOT)/cesysgen/sdk/lib/$(_CPUINDPATH)/coredll.lib /

    $(_TARGETPLATROOT)/lib/$(_CPUINDPATH)/DriverLib.lib

SOURCES= /

    MyKey.c

MyKey.def：

LIBRARY MyKey

EXPORTS         

        KEY_Init

        KEY_Deinit

        KEY_Open

        KEY_Close

        KEY_Read

        KEY_Write

        KEY_Seek

        KEY_IOControl

        KEY_PowerDown

        KEY_PowerUp