public async Task <bool> OpenAsync()
{
deviceHandle =
Kernel32.CreateFile(DevicePath,
NativeFileAccess.FILE_GENERIC_WRITE | NativeFileAccess.FILE_GENERIC_READ,
NativeFileShare.FILE_SHARE_WRITE | NativeFileShare.FILE_SHARE_READ,
IntPtr.Zero,
NativeFileMode.OPEN_EXISTING,
NativeFileFlag.FILE_ATTRIBUTE_NORMAL | NativeFileFlag.FILE_FLAG_OVERLAPPED,
IntPtr.Zero);
if (deviceHandle.IsInvalid || deviceHandle.IsClosed)
{
return(false);
}
if (UseOverlappedTransfers)
{
ThreadPool.BindHandle(deviceHandle); // needed for overlapped I/O
}
winUsbHandle = new SafeWinUsbHandle();
if (WinUsb.NativeMethods.WinUsb_Initialize(deviceHandle, ref winUsbHandle) == false)
{
return(false);
}
int trueVal = 1;
int timeout = 500;
int timeoutShort = 50;
WinUsb.NativeMethods.WinUsb_SetPipePolicy(winUsbHandle, peripheralResponseEndpoint,
PipePolicy.AutoClearStall, 4, ref trueVal);
WinUsb.NativeMethods.WinUsb_SetPipePolicy(winUsbHandle, peripheralResponseEndpoint,
PipePolicy.PipeTransferTimeout, 4, ref timeoutShort);
WinUsb.NativeMethods.WinUsb_SetPipePolicy(winUsbHandle, pinReportEndpoint,
PipePolicy.AutoClearStall, 4, ref trueVal);
WinUsb.NativeMethods.WinUsb_SetPipePolicy(winUsbHandle, pinReportEndpoint,
PipePolicy.PipeTransferTimeout, 4, ref timeout);
WinUsb.NativeMethods.WinUsb_SetPipePolicy(winUsbHandle, peripheralConfigEndpoint,
PipePolicy.AutoClearStall, 4, ref trueVal);
WinUsb.NativeMethods.WinUsb_SetPipePolicy(winUsbHandle, peripheralConfigEndpoint,
PipePolicy.PipeTransferTimeout, 4, ref timeout);
WinUsb.NativeMethods.WinUsb_SetPipePolicy(winUsbHandle, pinConfigEndpoint,
PipePolicy.AutoClearStall, 4, ref trueVal);
WinUsb.NativeMethods.WinUsb_SetPipePolicy(winUsbHandle, pinConfigEndpoint,
PipePolicy.PipeTransferTimeout, 4, ref timeout);
IsOpen = true;
BeginRead(pinReportEndpoint, pinReportBuffer, pinReportBuffer.Length, pinStateCallback,
null); // kick off our first pin read
return(true);
}
internal static extern bool WinUsb_Initialize([In] SafeHandle DeviceHandle,
[Out][In] ref SafeWinUsbHandle InterfaceHandle);
