/// <summary>
/// Initializes a new queue head with specified underlying memory structure.
/// </summary>
/// <param name="aQueueHead">The existing underlying queue head.</param>
public EHCI_QueueHead(EHCI_QueueHead_Struct* aQueueHead)
{
queueHead = aQueueHead;
}
/// <summary>
/// Initialises a queue head - memory must already be allocated.
/// </summary>
/// <param name="headPtr">A pointer to the queue head structure to initialise.</param>
/// <param name="horizPtr">
/// The virtual address of the next queue head in the list (or the first queue head since the
/// async queue is a circular buffer). This is translated into the physical address internally.
/// </param>
/// <param name="firstQTD">A pointer to the first qTD of the queue head.</param>
/// <param name="H">The Head of Reclamation list flag.</param>
/// <param name="deviceAddr">The address of the USB device to which this queue head belongs.</param>
/// <param name="endpoint">The endpoint number of the USB device to which this queue head belongs.</param>
/// <param name="maxPacketSize">The maximum packet size to use when transferring.</param>
protected void InitQH(EHCI_QueueHead_Struct* headPtr, EHCI_QueueHead_Struct* horizPtr, EHCI_qTD_Struct* firstQTD, bool H, byte deviceAddr,
byte endpoint, ushort maxPacketSize)
{
EHCI_QueueHead head = new EHCI_QueueHead(headPtr);
head.HorizontalLinkPointer = (EHCI_QueueHead_Struct*)VirtMemManager.GetPhysicalAddress(horizPtr);
head.Type = 0x1; // Types: 00b iTD, 01b QH, 10b siTD, 11b FSTN
head.Terminate = false;
head.DeviceAddress = deviceAddr; // The device address
head.InactiveOnNextTransaction = false;
head.EndpointNumber = endpoint; // endpoint 0 contains Device infos such as name
head.EndpointSpeed = 2; // 00b = full speed; 01b = low speed; 10b = high speed
head.DataToggleControl = true; // get the Data Toggle bit out of the included qTD
head.HeadOfReclamationList = H; // mark a queue head as being the head of the reclaim list
head.MaximumPacketLength = maxPacketSize; // 64 byte for a control transfer to a high speed device
head.ControlEndpointFlag = false; // only used if endpoint is a control endpoint and not high speed
head.NakCountReload = 0; // this value is used by EHCI to reload the Nak Counter field. 0=ignores NAK counter.
head.InterruptScheduleMask = 0; // not used for async schedule
head.SplitCompletionMask = 0; // unused if (not low/full speed and in periodic schedule)
head.HubAddr = 0; // unused if high speed (Split transfer)
head.PortNumber = 0; // unused if high speed (Split transfer)
head.HighBandwidthPipeMultiplier = 1; // 1-3 transaction per micro-frame, 0 means undefined results
if (firstQTD == null)
{
head.NextqTDPointer = null;
head.NextqTDPointerTerminate = true;
}
else
{
head.NextqTDPointer = (EHCI_qTD_Struct*)VirtMemManager.GetPhysicalAddress(firstQTD);
head.NextqTDPointerTerminate = false;
}
}
