internal int reapAsyncNoCancel(TransferContext transferContext)
{
int ret = -1;
lock (oLockTransferContext)
{
if (transferContext.mbAsyncCancelled)
{
return((int)ErrorCodes.ETHREADABORT);
}
}
ret = LibUsbAPI.usb_reap_async_nocancel(transferContext.mContext, transferContext.mTimeout);
lock (oLockTransferContext)
{
if (ret < 0 && ret != (int)ErrorCodes.ETIMEDOUT)
{
transferContext.mbAsyncCancelled = true;
UsbGlobals.Error(this, UsbGlobals.LastError, "reapAsyncNoCancel", ret);
}
else if (ret >= 0)
{
transferContext.mbAsyncCancelled = true;
transferContext.IncrementTransfer(ret);
}
return(ret);
}
}
internal int setupAsync(TransferContext transferContext)
{
int ret = -1;
lock (oLockTransferContext)
{
transferContext.Reset();
switch (mEpType)
{
case EndpointTypes.Bulk:
ret = LibUsbAPI.usb_bulk_setup_async(mUsbDevice.Handle, ref transferContext.mContext, EpNum);
break;
case EndpointTypes.Interrupt:
ret = LibUsbAPI.usb_interrupt_setup_async(mUsbDevice.Handle, ref transferContext.mContext, EpNum);
break;
case EndpointTypes.Isochronous:
ret = LibUsbAPI.usb_isochronous_setup_async(mUsbDevice.Handle, ref transferContext.mContext, EpNum, mPacketSize);
break;
}
if (ret < 0 || !transferContext.mContext.IsValid)
{
UsbGlobals.Error(this, UsbGlobals.LastError, "setupAsync", ret);
}
return(ret);
}
}
/// <summary>
/// Reads or Writes data (depending on the <see cref="EpNum"/>) to/from the current <see cref="UsbEndpointReader"/>.
/// </summary>
/// <param name="buffer">The buffer for the tranfer.</param>
/// <param name="offset">The position in buffer to start storing the data.</param>
/// <param name="count">The number of bytes to send or the maximum number of bytes to receive.</param>
/// <param name="timeout">Maximum time to wait for the transfer to complete. If the transfer times out, the IO operation will be cancelled.</param>
/// <returns>
/// Number of bytes transmitted or less than zero if an error occured.
/// </returns>
public int Transfer(byte[] buffer, int offset, int count, int timeout)
{
if (mbDisposed)
{
return((int)ErrorCodes.ENODEV);
}
if (!TransferLock.WaitOne(0, false))
{
return((int)ErrorCodes.EBUSY);
}
int ret = -1;
try
{
lock (oLockTransferContext)
Context.Setup(buffer, offset, count, timeout, true);
ret = transferSync(Context);
}
catch (Exception ex)
{
ret = (int)ErrorCodes.EEXCEPTION;
UsbGlobals.Error(this, ex.ToString(), "Transfer", ret);
}
finally
{
freeAsync(Context);
TransferLock.Release();
}
return(ret);
}
private void startStopReadThread()
{
if (IsDisposed)
{
return;
}
if (mDataReceivedEnabled)
{
mEventCancelReadThread.Set();
int iLoopCount = 0;
while (mthReadThread.IsAlive)
{
iLoopCount++;
if ((iLoopCount) > 1000)
{
mthReadThread.Abort();
UsbGlobals.Error(this, "Thread could not be gracefully stopped.", "startStopReadThread", (int)ErrorCodes.ETHREADABORT);
break;
}
Application.DoEvents();
Thread.Sleep(1);
if (Context.mContext.IsValid)
{
cancelAsync(Context);
}
}
iLoopCount = 0;
while (mDataReceivedEnabled)
{
iLoopCount++;
Application.DoEvents();
Thread.Sleep(1);
if ((iLoopCount) > 1000)
{
throw new LibUsbException(this, "startStopReadThread: The read thread is stalled.");
}
}
mthReadThread = null;
}
else
{
if (!TransferLock.WaitOne(0, false))
{
UsbGlobals.Error(this, "Read thread could not be started because a transfer is allready pending.", "startStopReadThread", (int)ErrorCodes.EBUSY);
return;
}
mEventCancelReadThread.Reset();
lock (oLockTransferContext)
Context.Setup(new byte[mReadBufferSize], 0, mReadBufferSize, Timeout.Infinite, false);
mthReadThread = new Thread(ReadData);
mthReadThread.Start(Context);
Application.DoEvents();
}
}
/// <summary>Opens this <see cref="UsbDevice"/> for communication.</summary>
/// <returns>True if the device was opened successfully.</returns>
public bool Open()
{
if (!mHandle.IsValid)
{
mHandle.Open(mDev);
if (!mHandle.IsValid)
{
UsbGlobals.Error(this, UsbGlobals.LastError, "Open", (int)ErrorCodes.EFAULT);
}
}
return(mHandle.IsValid);
}
/// <summary>Closes the device.</summary>
/// <remarks><dl class="cBList"><dt>The <see cref="Close" /> function performs the following actions:</dt>
/// <dd>Attempts to safely stop read threads on all <see cref="ActiveEndpoints" />.</dd>
/// <dd>Aborts read threads on all <see cref="ActiveEndpoints" /> if they fail to stop gracefully.</dd>
/// <dd>Closes and releases the internal device handle.</dd></dl></remarks>
public bool Close()
{
if (mHandle.IsValid)
{
ActiveEndpoints.Clear();
if (!mHandle.Close())
{
UsbGlobals.Error(this, UsbGlobals.LastError, "Close", (int)ErrorCodes.EFAULT);
return(false);
}
}
return(true);
}
/// <summary>
/// Sends/receives a control message to/from the current <see cref="UsbDevice"/>.
/// </summary>
/// <param name="requestType">USB request type.</param>
/// <param name="request">USB request.</param>
/// <param name="value">USB value.</param>
/// <param name="index">USB index.</param>
/// <param name="bytes">Buffer to send/recv from device.</param>
/// <param name="timeout">Maximum amount of time to wait for the function to complete.</param>
/// <returns>On Success, the number of bytes transmitted. Less than zero on failure.</returns>
public int IOControlMessage(int requestType, int request, int value, int index, Byte[] bytes, int timeout)
{
if (!Open())
{
return((int)ErrorCodes.EFAULT);
}
int ret = LibUsbAPI.usb_control_msg(mHandle, requestType, request, value, index, bytes, bytes == null ? 0 : bytes.Length, timeout);
if (ret < 0)
{
UsbGlobals.Error(this, UsbGlobals.LastError, "IOControlMessage", ret);
}
return(ret);
}
/// <summary>Sets the active configuration of the opened device.</summary>
/// <remarks>The <paramref name="iConfig" /> parameter is the value as specified in the descriptor field <see cref="InfoConfig.ConfigurationValue" /></remarks>
/// <returns>0 on success or less than 0 on error.</returns>
public int SetConfiguration(int iConfig)
{
if (!Open())
{
return((int)ErrorCodes.EFAULT);
}
int ret = LibUsbAPI.usb_set_configuration(mHandle, iConfig);
if (ret < 0)
{
UsbGlobals.Error(this, UsbGlobals.LastError, "SetConfiguration", ret);
}
return(ret);
}
///<summary>Sets the alternate interface to use for the claimed interface.</summary>
///<remarks>The <paramref name="iAltInterface"/> parameter is the value as specified in the descriptor field <see cref="InfoInterface.AlternateSetting"/>.</remarks>
///<returns>0 on success or less than 0 on error.</returns>
public int SetAltInterface(int iAltInterface)
{
if (!Open())
{
return((int)ErrorCodes.EFAULT);
}
int ret = LibUsbAPI.usb_set_altinterface(mHandle, iAltInterface);
if (ret < 0)
{
UsbGlobals.Error(this, UsbGlobals.LastError, "SetAltInterface", ret);
}
return(ret);
}
///<summary>Releases a claimed interface. See <see cref="ClaimInterface"/>.</summary>
///<returns>0 on success or less than 0 on error.</returns>
public int ReleaseInterface(int iInterface)
{
if (!Open())
{
return((int)ErrorCodes.EFAULT);
}
int ret = LibUsbAPI.usb_release_interface(mHandle, iInterface);
if (ret < 0)
{
UsbGlobals.Error(this, UsbGlobals.LastError, "ReleaseInterface", ret);
}
return(ret);
}
/// <summary>
/// All functions that call this function must first lock the <see cref="oLockTransferContext"/> object to be thread safe.
/// </summary>
/// <param name="transferContext"></param>
/// <returns></returns>
private int cancelAsync_NL(TransferContext transferContext)
{
int ret = 0;
if (transferContext.mbAsyncCancelled)
{
return(ret);
}
transferContext.mbAsyncCancelled = true;
ret = LibUsbAPI.usb_cancel_async(transferContext.mContext);
if (ret < 0)
{
UsbGlobals.Error(this, UsbGlobals.LastError, "cancelAsync", ret);
}
return(ret);
}
internal int submitAsync(TransferContext transferContext)
{
int ret = -1;
lock (oLockTransferContext)
ret = LibUsbAPI.usb_submit_async(transferContext.mContext, transferContext.PtrBuf, transferContext.RequestCount);
if (ret < 0)
{
UsbGlobals.Error(this, UsbGlobals.LastError, "submitAsync", ret);
}
else
{
lock (oLockTransferContext)
transferContext.mbAsyncCancelled = false;
}
return(ret);
}
internal int reapAsync(TransferContext transferContext)
{
int ret = -1;
ret = LibUsbAPI.usb_reap_async(transferContext.mContext, transferContext.mTimeout);
lock (oLockTransferContext)
transferContext.mbAsyncCancelled = true;
if (ret < 0 && ret != (int)ErrorCodes.ETIMEDOUT)
{
UsbGlobals.Error(this, UsbGlobals.LastError, "reapAsync", ret);
}
else if (ret >= 0)
{
lock (oLockTransferContext)
transferContext.IncrementTransfer(ret);
}
return(ret);
}
internal int freeAsync(TransferContext transferContext)
{
lock (oLockTransferContext)
{
int ret = 0;
if (!transferContext.mContext.IsValid)
{
return(ret);
}
cancelAsync_NL(transferContext);
ret = LibUsbAPI.usb_free_async(ref transferContext.mContext);
if (ret < 0 || transferContext.mContext.IsValid)
{
UsbGlobals.Error(this, UsbGlobals.LastError, "freeAsync", ret);
}
return(ret);
}
}
