public LibUSBAsyncTransfer(IntPtr device, byte endpoint, int bufferSize)
{
//Configure
this.device = device;
this.bufferSize = bufferSize;
//Create buffer
buffer = UnsafeBuffer.Create(bufferSize, out bufferPtr);
//Allocate transfer
transfer = (LibUSBTransfer *)LibUSBNative.libusb_alloc_transfer(0);
//Get the GCHandle for ourself
handle = GCHandle.Alloc(this);
//Populate transfer (same as libusb_fill_bulk_transfer)
transfer->dev_handle = device;
transfer->endpoint = endpoint;
transfer->type = LibUSBTransferType.LIBUSB_TRANSFER_TYPE_BULK;
transfer->timeout = 0;
transfer->buffer = bufferPtr;
transfer->length = bufferSize;
transfer->user_data = (IntPtr)handle;
transfer->callback = Marshal.GetFunctionPointerForDelegate(TransferCallbackDelegate);
}
public IUsbDevice[] FindDevices(ushort vid, ushort pid)
{
//Get USB devices
IntPtr devicesRef = IntPtr.Zero;
int count = LibUSBNative.libusb_get_device_list(ctx, ref devicesRef);
IntPtr *devices = (IntPtr *)devicesRef.ToPointer();
//Loop through devices
List <LibUSBDevice> found = new List <LibUSBDevice>();
for (int i = 0; i < count; i++)
{
//Get pointer to the device
IntPtr device = devices[i];
//Get info
LibUSBDeviceDescriptor info;
if (LibUSBNative.libusb_get_device_descriptor(device, &info) != 0)
{
continue;
}
//Check if this is a match
if (vid != info.idVendor || pid != info.idProduct)
{
continue;
}
//Construct object
found.Add(new LibUSBDevice(device, info));
}
return(found.ToArray());
}
private void EventLoop()
{
while (true)
{
LibUSBNative.libusb_handle_events(ctx);
}
}
public int BulkTransfer(UsbTransferDirection direction, byte endpoint, UsbBuffer buffer, int timeout)
{
int transferred;
LibUSBNative.ThrowIfError(LibUSBNative.libusb_bulk_transfer(handle, (byte)(endpoint | (byte)direction), buffer.AsPtr(), buffer.ByteLength, &transferred, (uint)timeout));
return(transferred);
}
public LibUSBProvider()
{
//Create the LibUSB instance
LibUSBNative.ThrowIfError(LibUSBNative.libusb_init(ref ctx));
//Create event thread
eventThread = new Thread(EventLoop);
eventThread.Name = "LibUSB Provider Event Loop";
eventThread.IsBackground = true;
eventThread.Start();
}
private string ReadStringDescriptor(byte index, int length = 255)
{
//Make sure it's open
ThrowIfUnopened();
//Create buffer
byte[] buffer = new byte[length];
//Get data
fixed(byte *bufferPtr = buffer)
length = LibUSBNative.libusb_get_string_descriptor_ascii(handle, index, bufferPtr, length);
//Read
return(Encoding.ASCII.GetString(buffer, 0, length));
}
private int ControlTransfer(byte flags, byte fieldRequest, ushort fieldValue, ushort fieldIndex, UsbBuffer buffer, uint timeout)
{
//Apply
int code;
if (buffer != null)
{
code = LibUSBNative.libusb_control_transfer(handle, flags, fieldRequest, fieldValue, fieldIndex, buffer.AsPtr(), (ushort)buffer.ByteLength, timeout);
}
else
{
code = LibUSBNative.libusb_control_transfer(handle, flags, fieldRequest, fieldValue, fieldIndex, null, 0, timeout);
}
//Valiate
if (code < 0)
{
throw new Exception("Unknown USB transfer write error.");
}
return(code);
}
public bool OpenDevice()
{
//If it's already opened, return true
if (isOpened)
{
return(true);
}
//Request the device to be opened
handle = IntPtr.Zero;
isOpened = LibUSBNative.libusb_open(device, ref handle) == 0;
if (!isOpened)
{
return(false);
}
//Set config
LibUSBNative.ThrowIfError(LibUSBNative.libusb_set_configuration(handle, 1));
LibUSBNative.ThrowIfError(LibUSBNative.libusb_claim_interface(handle, 0));
return(true);
}
public void SubmitTransfer()
{
LibUSBNative.ThrowIfError(LibUSBNative.libusb_submit_transfer(transfer));
}
