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Contents Programming For PCI Device Overview Programmers Guide Scenario Access to PCI devices information How to work with PCI header Accessing PCI registers Accessing BAR0-BAR5 areas I/O Ports control Single read/write operations Data array read/write operations Accessing Physical Memory Addresses Memory Mapping Additional Functions Hardware interrupts handling at user level Common Issues Extended options of hardware interrupt handling PCI Support Routines And Structures Common Procedures OpenRapidPci IsRapidPciOpened CloseRapidPci GetHardwareConfiguration GetPciLocation PCI specific functions PCI Header GetPciHeader SetPciHeader ReadFromPci WriteToPci PCI BAR Areas GetNumOfPciBars GetPciBarLength GetPciBarPhysicalAddress GetPciBarLinearAddress ReadPciBarByte ReadPciBarWord ReadPciBarLong WritePciBarByte WritePciBarWord WritePciBarLong PCI Registers ReadPciCommandReg WritePciCommandReg ControlPciCommandRegBits ReadPciStatusReg Memory Access MapPhysToLinear UnmapMemory GetMem GetMemW GetMemL SetMem SetMemW SetMemL Direct Port I/O GetPortByte GetPortWord GetPortLong SetPortByte SetPortWord SetPortLong ReadPortBuffer WritePortBuffer Hardware Interrupts UnmaskPciIrq MaskPciIrq GetInterruptCounter		Scenario Go to RapidDriver Main Page Before using any of the functions of RapidPci, the driver must be initialized with the help of the function OpenRapidPci . It must be done once after starting the application. Also resources used by the driver should be cleaned up(driver closed) before the application is closed. Schematic session of using RapidPci: // initialize(open) the driver   hPci =  OpenRapidPci( 0 );    // Check if the driver initialized successfully   if ( IsRapidPciOpened(hPci)) {         ...    //////////////////////////////////////   /////////  RapidPci session //////////   /////////  ................ //////////   //////////////////////////////////////   // Free resources used by the driver (close the driver)            hPci = CloseRapidPci(hPci);    }   else     {   // An error happened while opening the driver   MessageBox("Cannot open the driver","Attention!", MB_OK | MB_ICONWARNING);      }   Driver can be initialized by many applications simultaneously, once for each PCI board. The parameter of OpenRapidPci() can be used to select a device supported by RapidPci driver.