private void pinStateCallback(IAsyncResult result)
{
EndRead(result);
PinEventDataReceived?.Invoke(pinReportBuffer);
if (!IsOpen)
{
return;
}
try
{
BeginRead(pinReportEndpoint, pinReportBuffer, pinReportBuffer.Length, pinStateCallback,
null); // start another read
}
catch (Exception ex)
{
Debug.WriteLine("Exception: " + ex.Message);
}
}
public async Task <bool> OpenAsync()
{
var handle = new IntPtr();
NativeMethods.Open(deviceProfile, ref handle);
deviceHandle = new LibUsbDeviceHandle(handle);
NativeMethods.ClaimInterface(deviceHandle, 0);
isOpen = true;
pinListenerTask = new Task(async() =>
{
while (isOpen)
{
var buffer = new byte[41];
var len = 0;
try
{
var res = NativeMethods.BulkTransfer(deviceHandle, pinReportEndpoint, buffer, buffer.Length,
out len, 1000);
switch (res)
{
case LibUsbError.Success:
PinEventDataReceived?.Invoke(buffer);
break;
case LibUsbError.ErrorNoDevice:
case LibUsbError.ErrorPipe:
case LibUsbError.ErrorOverflow:
this.Close();
// HACK ALERT: device removal notifications don't seem to work right, so if we get ErrorNoDevice,
// request that ConnectionService remove the board that matches our device path.
((LibUsbConnectionService)ConnectionService.Instance).RemoveDevice(this.DevicePath);
break;
case LibUsbError.ErrorTimeout:
case LibUsbError.ErrorIO:
break; // normal behavior
default:
Debug.WriteLine("Pin Data Read Failure: " + res);
break;
}
}
catch (Exception ex)
{
Debug.WriteLine("Exception: " + ex.Message);
}
int rate = (int)Math.Round(1000.0 / UpdateRate);
if (rate > 1)
{
await Task.Delay(rate).ConfigureAwait(false);
}
}
});
pinListenerTask.Start();
return(true);
}
public async Task <bool> OpenAsync()
{
deviceInterface.GetDeviceAsyncEventSource(deviceInterface.Handle);
var kr = deviceInterface.USBDeviceOpen(deviceInterface.Handle);
if (kr != IOKitError.Success)
{
Debug.WriteLine("Couldn’t open device: " + kr);
return(false);
}
byte numConfigs = 0;
deviceInterface.GetNumberOfConfigurations(deviceInterface.Handle, out numConfigs);
if (numConfigs == 0)
{
return(false);
}
IOUSBConfigurationDescriptor configDesc = new IOUSBConfigurationDescriptor();
kr = deviceInterface.GetConfigurationDescriptorPtr(deviceInterface.Handle, 0, out configDesc);
if (kr != IOKitError.Success)
{
Debug.WriteLine("Couldn’t get configuration descriptor for index: " + kr);
return(false);
}
kr = deviceInterface.SetConfiguration(deviceInterface.Handle, configDesc.bConfigurationValue);
if (kr != IOKitError.Success)
{
Debug.WriteLine("Couldn’t set configuration to value: " + kr);
return(false);
}
// HACK: the LED blinks three times since we reconfigured it. Ugh, we should wait here so we don't miss commands
await Task.Delay(500).ConfigureAwait(false);
IOUSBFindInterfaceRequest interfaceRequest = new IOUSBFindInterfaceRequest();
IntPtr interfaceIteratorPtr = IntPtr.Zero;
kr = deviceInterface.CreateInterfaceIterator(deviceInterface.Handle, interfaceRequest, out interfaceIteratorPtr);
if (kr != IOKitError.Success)
{
Debug.WriteLine("Failed to create interface iterator: " + kr);
return(false);
}
IOIterator interfaceIterator = new IOIterator(interfaceIteratorPtr);
var usbInterface = interfaceIterator.Next();
if (usbInterface == null)
{
Debug.WriteLine("Failed to find an interface.");
return(false);
}
IntPtr pluginInterfacePtrPtr = IntPtr.Zero;
int score = 0;
if (NativeMethods.IOCreatePlugInInterfaceForService(usbInterface.Handle, kIOUSBInterfaceUserClientTypeID, kIOCFPlugInInterfaceID, out pluginInterfacePtrPtr, out score) != IOKitError.Success)
{
Debug.WriteLine("Failed to create CF Plug-In interface: " + kr);
return(false);
}
IOCFPlugInInterface pluginInterface = IOCFPlugInInterface.GetPlugInInterfaceFromPtrPtr(pluginInterfacePtrPtr);
usbInterface.Dispose();
interfaceIterator.Dispose();
IntPtr interfaceInterfacePtrPtr = IntPtr.Zero;
if (pluginInterface.QueryInterface(pluginInterfacePtrPtr, kIOUSBInterfaceInterfaceID, out interfaceInterfacePtrPtr) != IOKitError.Success)
{
Debug.WriteLine("Could not query plugin interface to retrieve interface interface: " + kr);
return(false);
}
IntPtr interfaceInterfacePtr = new IntPtr(Marshal.ReadInt64(interfaceInterfacePtrPtr));
if (interfaceInterfacePtr == IntPtr.Zero)
{
Debug.WriteLine("Bad InterfaceInterface pointer");
return(false);
}
interfaceInterface = (IOUSBInterfaceInterface197)Marshal.PtrToStructure(interfaceInterfacePtr, typeof(IOUSBInterfaceInterface197));
interfaceInterface.Handle = interfaceInterfacePtrPtr;
byte intNumber = 0;
interfaceInterface.GetNumEndpoints(interfaceInterface.Handle, out intNumber);
interfaceInterface.GetInterfaceClass(interfaceInterface.Handle, out intNumber);
kr = interfaceInterface.GetInterfaceNumber(interfaceInterface.Handle, out intNumber);
if (kr != IOKitError.Success)
{
Debug.WriteLine("Couldn't get interface number: " + kr);
return(false);
}
kr = interfaceInterface.USBInterfaceOpen(interfaceInterface.Handle);
if (kr != IOKitError.Success)
{
Debug.WriteLine("Couldn't open interface: " + kr);
return(false);
}
isConnected = true;
pinReportThread = new Thread(() =>
{
byte[] pinReport = new byte[41];
uint numBytesToRead = 41;
while (isConnected)
{
var status = interfaceInterface.ReadPipeTO(interfaceInterface.Handle, 1, pinReport, out numBytesToRead, 1000, 1000);
switch (status)
{
case IOKitError.Success:
PinEventDataReceived?.Invoke(pinReport);
break;
case IOKitError.NoDevice:
case IOKitError.Aborted:
return; // board was unplugged, so kill this thread
break;
case IOKitError.TransactionTimedOut:
// we probably don't have any inputs activated. No need to report to the user.
status = interfaceInterface.ClearPipeStallBothEnds(interfaceInterface.Handle, 1);
break;
default:
Debug.WriteLine("Read from pin report failed: " + status);
status = interfaceInterface.ClearPipeStallBothEnds(interfaceInterface.Handle, 1);
if (status != IOKitError.Success)
{
Debug.WriteLine("Can't clear pipe stall: " + status);
}
break;
}
Thread.Sleep(UpdateRate);
}
});
pinReportThread.Name = "PinReportThread";
pinReportThread.Start();
return(true);
}