// SendFWKey(key) sends the key (*unmapped* RKEY_XXX) to the firmware direct (bypassing buffer)
//   e.g. SendFWKey(RKEY_Mute)     [toggles mute]
//        SendFWKey(RKEY_AudioTrk) [on the TF5800 this is the way to send the "Exit" key, on other models use RKEY_Exit]
// returns 0 if unsuccessful (cannot find firmware function)
int SendFWKey(dword key)
{
  static dword processEvt = 0;
  if(processEvt == 0)
  {
    dword *codeSeg = (dword*)FindInstructionSequence(
      "34a50022 241e000a 3c150001 36b50013 3404e300 0c054af0 02a02825 27deffff 17c0fffc 3404e300",
      "FFFFFFFF FFFFFFFF FFF0FFFF FF00FFF0 FFFFFFFF FC000000 FF0FFFFF FFFFFFFF FFFFFFFF FFFFFFFF",
      0x80100000, 0x80180000, 0, FALSE);
    if(codeSeg == NULL)
    {
      InitTAPex();
      TAP_Print("SendFWKey.c: unsupported firmware (fw: %d:%x)\n",SysID,ApplID);
      return 0;
    }
    processEvt = ABS_ADDR(codeSeg[4]);
  }
  CallFirmwareA(processEvt, 0xE300, key);
  return 1;
}