KeyTester.c

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#include <Uefi.h>
#include <Library/UefiLib.h>
#include <Library/DebugLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiApplicationEntryPoint.h>
 
EFI_STATUS
EFIAPI
UefiMain (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS     Status;
  UINTN          EventIndex;
  EFI_INPUT_KEY  Key;
 
  STATIC CHAR16  Output[] = L"Received symbol:  \r\n";
 
  do {
    //
    // Read a key
    //
    gBS->WaitForEvent (1, &gST->ConIn->WaitForKey, &EventIndex);
    ZeroMem (&Key, sizeof (Key));
    Status = gST->ConIn->ReadKeyStroke (gST->ConIn, &Key);
    if (EFI_ERROR (Status)) {
      if (Status == EFI_NOT_READY) {
        continue;
      }
 
      break;
    }
 
    Output[ARRAY_SIZE (Output) - 4] = Key.UnicodeChar;
    gST->ConOut->OutputString (gST->ConOut, Output);
    DEBUG ((DEBUG_INFO, "KKT: Received %X %X\n", Key.ScanCode, Key.UnicodeChar));
  } while (TRUE);
 
  return EFI_SUCCESS;
}