public UsbKeyPowerSettings ReadUsbSettings()
{
// create the packet
byte[] packet = new byte[Constants.PacketsSize];
packet[0] = CommandCodes.ReadChipParameters;
packet[1] = SubCommandCodes.UsbPowerUpKeyParameters;
byte[] reply = _hidHandler.WriteData(packet);
// check if package format is faulty
if (reply[0] != CommandCodes.ReadChipParameters ||
reply[2] != SubCommandCodes.UsbPowerUpKeyParameters)
{
throw new PacketReplyFormatException();
}
// create the settings
UsbKeyPowerSettings settings = new UsbKeyPowerSettings();
settings.VID = Convert.ToInt32(BitConverter.ToUInt16(reply, 12));
settings.PID = Convert.ToInt32(BitConverter.ToUInt16(reply, 14));
settings.RequestedCurrent = Convert.ToInt32(reply[30]) * 2; // 2mA Quanta
settings.RemoteWakeUpCapable = (reply[29] & 32) == 32;
settings.SelfPowered = (reply[29] & 64) == 64;
settings.HostPowered = (reply[29] & 128) == 128;
return(settings);
}
public void WriteUsbSettings(UsbKeyPowerSettings settings)
{
// get VID & pid bytes
byte[] vidBytes = BitConverter.GetBytes(Convert.ToUInt16(settings.VID));
byte[] pidBytes = BitConverter.GetBytes(Convert.ToUInt16(settings.PID));
// get chip power options
byte cpOptionsByte = 0x00;
cpOptionsByte |= (byte)(settings.RemoteWakeUpCapable ? 32 : 0); // 0010 0000
cpOptionsByte |= (byte)(settings.SelfPowered ? 64 : 0); // 0100 0000
cpOptionsByte |= (byte)(settings.HostPowered ? 128 : 0); // 1000 0000
// get current bytes
byte currentByte = Convert.ToByte(settings.RequestedCurrent / 2);
// create the package
byte[] packet = new byte[Constants.PacketsSize];
packet[0] = CommandCodes.WriteChipParameters;
packet[1] = SubCommandCodes.UsbPowerUpKeyParameters;
packet[4] = vidBytes[0];
packet[5] = vidBytes[1];
packet[6] = pidBytes[0];
packet[7] = pidBytes[1];
packet[8] = cpOptionsByte;
packet[9] = currentByte;
// write the packet
byte[] reply = _hidHandler.WriteData(packet);
// check if package format is faulty
if (reply[0] != CommandCodes.WriteChipParameters ||
reply[2] != SubCommandCodes.UsbPowerUpKeyParameters)
{
throw new PacketReplyFormatException();
}
switch (reply[1])
{
case ReplyStatusCodes.CompletedSuccessfully:
break;
case ReplyStatusCodes.BlockedAccess:
throw new AccessBlockedException();
default:
throw new NotImplementedException();
}
}
