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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		Additional Functions Go to RapidDriver Main Page As it was mentioned, the MapPhysToLinear function returns the pointer to the linear memory defined by it's physical address and size. You can work with a returned pointer directly or by means of additional functions set which provides physical memory access by bytes, by words or by double words. It's especially useful for Visual Basic programmers as Visual basic has some limitations on working with a pointers directly. Below is the list of the above mentioned functions: UCHAR  GetMem  (HANDLE hPci, ULONG LinAddr, ULONG Offset); USHORT GetMemW (HANDLE hPci, ULONG LinAddr, ULONG Offset);  ULONG  GetMemL (HANDLE hPci, ULONG LinAddr, ULONG Offset);  void   SetMem  (HANDLE hPci, ULONG LinAddr, ULONG Offset, UCHAR bValue); void   SetMemW (HANDLE hPci, ULONG LinAddr, ULONG Offset, USHORT wValue);  void   SetMemL (HANDLE hPci, ULONG LinAddr, ULONG Offset, ULONG dValue);