Rockwell Automation 2711P Software Development Kit User Manual - Manual (Page 91)

Publication 2711P-UM005A-EN-P - March 2007
Device Drivers 91
#if defined(DRV_USE_ISR)
//
// If a DLL name was not assigned yet, just default the name for
// use with the Microsoft GIISR chain handler.
//
if (NULL == pDrvData->Dii.szIsrDll)
{
_tcscpy(pDrvData->Dii.szIsrDll,_T("giisr.dll"));
}
//
// If a ISRHandler name was not assigned yet, just default the name for
// use with the Microsoft GIISR chain handler.
//
if (NULL == pDrvData->Dii.szIsrHandler)
{
_tcscpy(pDrvData->Dii.szIsrHandler,_T("IsrHandler"));
}
//
// Install ISR handler if there is one
//
pDrvData->hIsrHandler = LoadIntChainHandler(pDrvData->Dii.szIsrDll,
pDrvData->Dii.szIsrHandler,
(BYTE)pDrvData->Dii.dwIrq);
if (INVALID_HANDLE_VALUE == pDrvData->hIsrHandler)
{
ERRORMSG(1,(_T("DRV_Init: Couldn't install ISR handler!\r\n")));
DEBUGMSG(ZONE_FUNC, (TEXT("DRV_Init-\r\n")));
DRV_Deinit((DWORD)pDrvData);
return (0);
}
///////////////////////////////////////////////////////////////////////
//
// Communicate with the chain handler and pass to it the info needed to
// detect a IRQ intended for this device.
//
// NOTE: This code assumes the chain handler conforms to the exact same
// interface as the GIISR.
//
/////////////////////////////////////////////////////////////////////////////
if (!KernelLibIoControl(pDrvData->hIsrHandler, IOCTL_GIISR_INFO,
&pDrvData->Gii, sizeof(GIISR_INFO), NULL, 0, NULL))
{
ERRORMSG(1,(_T("DRV_Init: KernelLibIoControl call failed!\r\n")));
DEBUGMSG(ZONE_FUNC, (TEXT("DRV_Init-\r\n")));
DRV_Deinit((DWORD)pDrvData);
return (0);
}
#endif // defined(DRV_USE_ISR)
//
// Create the IST event.
//