public bool UpdateDeviceConnectionStatus()
{
var hwDeviceStatus = hw.CheckConnectionStatus();
if (hwDeviceStatus == UsbDeviceConnectionStatus.NotConnected)
{
connectedDevice = null;
return(true);
}
else if (hwDeviceStatus == UsbDeviceConnectionStatus.Changed)
{
InitializeDevice();
return(true);
}
else if (hwDeviceStatus == UsbDeviceConnectionStatus.Error)
{
throw new UsbTransferException("Error on USB bus reset", UsbPacketResult.OtherError);
}
return(false);
}
private UsbPacketResult InitializeDevice()
{
byte[] data = new byte[255];
UsbTransferResult result;
UsbSetupPacket getDescriptorSetupPacket = new UsbSetupPacket(UsbStandardRequest.GET_DESCRIPTOR, 0x80);
byte endpointZeroMaxPacketSize = 8;
//InitializeHub();
//Here device is in DEFAULT state (hw did bus reset already):
result = GetDescriptor(0, UsbDescriptorType.DEVICE, 0, 0, endpointZeroMaxPacketSize, out data);
if (result.IsError)
{
throw new UsbTransferException($"When getting device descriptor: {result.TransactionResult}", result.TransactionResult);
}
endpointZeroMaxPacketSize = data[7];
var deviceDescriptorBytes = data.Take(result.TransferredDataCount).ToArray();
var setAddressSetupPacket = new UsbSetupPacket(UsbStandardRequest.SET_ADDRESS, 0);
setAddressSetupPacket.wValue = UsbDeviceAddress;
result = hw.ExecuteControlTransfer(setAddressSetupPacket, null, 0, 0, endpointZeroMaxPacketSize);
if (result.IsError)
{
throw new UsbTransferException($"When setting device address: {result.TransactionResult}", result.TransactionResult);
}
//Here device is in ADDRESS state
getDescriptorSetupPacket.wValueH = UsbDescriptorType.CONFIGURATION;
getDescriptorSetupPacket.wValueL = 0; //We're interested in the first pconfiguration available
getDescriptorSetupPacket.wLength = (short)data.Length;
result = GetDescriptor(UsbDeviceAddress, UsbDescriptorType.CONFIGURATION, 0, 0, endpointZeroMaxPacketSize, out data);
if (result.IsError)
{
throw new UsbTransferException($"When getting configuration descriptor: {result.TransactionResult}", result.TransactionResult);
}
var bConfigurationValue = data[5];
var configurationDescriptorLength = result.TransferredDataCount;
var setConfigSetupPacket = new UsbSetupPacket(UsbStandardRequest.SET_CONFIGURATION, 0);
setConfigSetupPacket.wValueL = bConfigurationValue;
result = hw.ExecuteControlTransfer(setConfigSetupPacket, null, 0, UsbDeviceAddress, endpointZeroMaxPacketSize);
if (result.IsError)
{
throw new UsbTransferException($"When setting device configuration: {result.TransactionResult}", result.TransactionResult);
}
//Here device is in CONFIGURED state
var interfacesInfo = GetInterfacesInfo(data.Take(configurationDescriptorLength).ToArray());
connectedDevice = new UsbConnectedDevice(
endpointZeroMaxPacketSize,
deviceDescriptorBytes[4],
deviceDescriptorBytes[5],
deviceDescriptorBytes[6],
(int)(deviceDescriptorBytes[8] | (deviceDescriptorBytes[9] << 8)),
(int)(deviceDescriptorBytes[10] | (deviceDescriptorBytes[11] << 8)),
deviceDescriptorBytes[14],
deviceDescriptorBytes[15],
interfacesInfo);
return(UsbPacketResult.Ok);
}