wRTOS Memory Mapping Calls Programming Example

The following programming example demonstrates the use of wRTOS memory mapping calls.

#include <windows.h>
#include <stdio.h>
#include <rtapi.h>

void main(void) {
      BOOL success=0;
      static PVOID vAddress; // virtual memory address returned
      LARGE_INTEGER physAddr; // base physical address
      ULONG length; // length to map in
      BOOLEAN cacheEnable; // cache accesses to memory ?
      physAddr.QuadPart = 0x0000FFFFF;
      length = 1024;
      cacheEnable = 0;
      vAddress=RtMapMemory( physAddr, length, cacheEnable);
      if (vAddress==NULL) {
            printf("Failure on RtMapMemory( 0x%08X, %d, %d ).\n", physAddr.LowPart, length, cacheEnable );
      }
      else {
            printf("Success on RtMapMemory( 0x%08X, %d, %d ).\n", physAddr.LowPart, length, cacheEnable );
            printf("Virtual memory address = 0x%08X \n", vAddress);
            success = RtUnmapMemory( vAddress);
            if (!success) {
                  printf("Failure on RtUnmapMemory( 0x%08X)\t", vAddress);
            }
            else {
                  printf("Success on RtUnmapMemory( 0x%08X)\n\n", vAddress);
            }
      }
      ExitProcess(0);
}

APIs Referenced

RTAPI	Windows-Supported
RtMapMemory RtUnmapMemory RtFreeContiguousMemory	ExitProcess