private Device(UsbDevice dev, byte conf, byte interf)
{
this.configIndex = conf;
this.interfaceIndex = interf;
this.device = dev;
this.dfuDesc = new FunctionalDescriptor(InterfaceInfo.CustomDescriptors[0]);
this.info = new Identification((ushort)device.Info.Descriptor.VendorID,
(ushort)device.Info.Descriptor.ProductID,
(ushort)device.Info.Descriptor.BcdDevice,
dfuDesc.bcdDFUVersion);
}
private void LoadDfuDescriptor()
{
// try to find the functional descriptor in the custom descriptors
foreach (var desc in InterfaceInfo.CustomDescriptors)
{
try
{
dfuDesc = new FunctionalDescriptor(desc);
return;
}
catch (Exception)
{
}
}
// try to get it from the interface manually
RequestType rtype;
UsbSetupPacket s;
try
{
byte[] dbuf = new byte[FunctionalDescriptor.Size];
rtype = new RequestType(UsbEndpointDirection.EndpointIn,
UsbRequestType.TypeStandard, UsbRequestRecipient.RecipInterface);
s = new UsbSetupPacket(rtype, (byte)UsbStandardRequest.GetDescriptor,
FunctionalDescriptor.Type << 8, InterfaceID, FunctionalDescriptor.Size);
ControlTransfer(s, dbuf, dbuf.Length);
dfuDesc = new FunctionalDescriptor(dbuf);
return;
}
catch (Exception)
{
}
// read the whole configuration descriptor and extract it from there
byte[] buffer = new byte[ConfigInfo.Descriptor.TotalLength];
rtype = new RequestType(UsbEndpointDirection.EndpointIn,
UsbRequestType.TypeStandard, UsbRequestRecipient.RecipDevice);
s = new UsbSetupPacket(rtype, (byte)UsbStandardRequest.GetDescriptor,
2 << 8, 0, buffer.Length);
ControlTransfer(s, buffer, buffer.Length);
// iterate through the descriptors
int ifaceIndex = -1;
for (int i = 0; i < buffer.Length; i += buffer[i])
{
var descLength = buffer[i];
var descType = buffer[i + 1];
// we need to find the descriptor that is in the context of the current DFU interface
if (descType == (byte)DescriptorType.Interface)
{
ifaceIndex = buffer[i + 2];
continue;
}
// now we have a good candidate
if ((ifaceIndex == interfaceIndex) &&
(descLength == FunctionalDescriptor.Size) &&
(descType == FunctionalDescriptor.Type))
{
try
{
byte[] dbuf = new byte[FunctionalDescriptor.Size];
Array.Copy(buffer, i, dbuf, 0, dbuf.Length);
dfuDesc = new FunctionalDescriptor(dbuf);
return;
}
catch (Exception)
{
}
}
}
throw new ApplicationException(String.Format("Failed to fetch DFU Functional Descriptor from target {1}", this));
}
