private CmdGetCapabilitiesDescriptorResponse GetFullDescriptor(int size, IUsbControlPipe controlPipe, ILogger logger)
{
var package = GetFullDescriptorRequest(size);
try
{
var response = controlPipe.ControlTransferIn(
package.bmRequestType, package.bRequest, package.wValue, package.wIndex, package.wLength);
var descriptor = response.ToInternalCapabilitiesDescriptor();
return(new CmdGetCapabilitiesDescriptorResponse
{
Succeeded = true,
CapabilitiesDescriptor = descriptor
});
}
catch (Exception ex)
{
logger.LogError($"Error retrieving capabilities descriptor (requested {size} bytes)", ex);
return(new CmdGetCapabilitiesDescriptorResponse
{
Succeeded = false,
CapabilitiesDescriptor = null
});
}
}
public X20DeviceImplementation(ILogger logger, IUsbDataPipe usbDataPipe, IUsbControlPipe usbControlPipe, string serialNumber)
{
_logger = logger;
_usbDataPipe = usbDataPipe;
_usbControlPipe = usbControlPipe;
_serialNumber = serialNumber;
_capabilities = RetrieveCapabilities();
LogDeviceInformation(_logger, _capabilities);
}
private int GetDescriptorSize(IUsbControlPipe controlPipe)
{
var package = GetPartialDescriptorRequest();
try
{
var response = controlPipe.ControlTransferIn(
package.bmRequestType, package.bRequest, package.wValue, package.wIndex, package.wLength);
return(response[0] + (response[1] << 8));
}
catch (Exception ex)
{
_logger.LogError(ex, "Error retrieving the size of the capabilities descriptor");
return(0);
}
}
public ICommandResponse Execute(IUsbControlPipe controlPipe)
{
if (controlPipe == null)
{
throw new ArgumentNullException(nameof(controlPipe));
}
var size = GetDescriptorSize(controlPipe);
if (size < 14)
{
_logger.LogError($"The reported size of the capabilities descriptor is too small ({size} bytes)");
return(new CmdGetCapabilitiesDescriptorResponse
{
Succeeded = false,
CapabilitiesDescriptor = null
});
}
return(GetFullDescriptor(size, controlPipe, _logger));
}
public ICommandResponse Execute(IUsbControlPipe controlPipe)
{
if (controlPipe == null)
{
throw new ArgumentNullException(nameof(controlPipe));
}
var package = GetSetupPackage();
if (package.wLength == 0)
{
try
{
controlPipe.ControlTransfer(
package.bmRequestType, package.bRequest, package.wValue, package.wIndex);
return(ParseEmptyResponse());
}
catch (Exception ex)
{
Logger.LogError($"Error executing command {GetType().Name}", ex);
return(ParseFailure(ex));
}
}
else
{
try
{
var response = controlPipe.ControlTransferIn(
package.bmRequestType, package.bRequest, package.wValue, package.wIndex, package.wLength);
return(ParseResponse(response));
}
catch (Exception ex)
{
Logger.LogError($"Error executing command {GetType().Name}", ex);
return(ParseFailure(ex));
}
}
}