Multiple bulk in and out endpoints in StarterWare USB

Good afternoon,

I have been trying to get the FT4232H chip to work in my sys/bios project.

I started by integrating the usb library from starterware and getting the mouse demo working and then moved onto the FT232R and I have both of these working well.

Up until today I was making good progress getting the FT4232H going but have now come up against a wall.  The device connects fine and I am able to setup all of the baud rates etc for the 4 ports however I cannot write to the pipes for the extra three ports.  The device reports 4 interfaces and 2 endpoints on each and this is how I have modified the code that allocates the endpoint to accomodate this.

    for(InterfaceNo = 0; (InterfaceNo < pDevice->pConfigDescriptor->bNumInterfaces) && (InterfaceNo < MAX_INTERFACES); InterfaceNo++)
    {
		//
		// Get the interface descriptor.
		//
		pInterface = USBDescGetInterface(pDevice->pConfigDescriptor, InterfaceNo, 0);

		//
		// Loop through the endpoints of the device.
		//
		for(iIdx = 0; iIdx < pInterface->bNumEndpoints; iIdx++)
		{
			//
			// Get the first endpoint descriptor.
			//
			pEndpointDescriptor =
				USBDescGetInterfaceEndpoint(pInterface, iIdx,
											pDevice->ulConfigDescriptorSize);

			//
			// If no more endpoints then break out.
			//
			if(pEndpointDescriptor == 0)
			{
				//
				// should actually never happen
				//
				break;
			}

			//
			// See if this is a bulk endpoint.
			//
			if((pEndpointDescriptor->bmAttributes & USB_EP_ATTR_TYPE_M) ==
			   USB_EP_ATTR_BULK)
			{
				//
				// See if this is bulk IN or bulk OUT.
				//
				if(pEndpointDescriptor->bEndpointAddress & USB_EP_DESC_IN)
				{
					//
					// Allocate the USB Pipe for this Bulk IN endpoint.
					//
					g_USBHFTDIDevice.ulBulkInPipe[InterfaceNo] =
						USBHCDPipeAllocSize(ulIndex, USBHCD_PIPE_BULK_IN, //USBHCD_PIPE_BULK_IN_DMA,
											pDevice->ulAddress,
											pEndpointDescriptor->wMaxPacketSize,
											USBHCDInPipeCallback);
					//
					// Configure the USB pipe as a Bulk IN endpoint.
					//
					USBHCDPipeConfig(ulIndex, g_USBHFTDIDevice.ulBulkInPipe[InterfaceNo],
									 pEndpointDescriptor->wMaxPacketSize,
									 PIPE_BULK_IN_POLLING_INTERVAL,		// polling interval in frames (typically milli seconds)
									 (pEndpointDescriptor->bEndpointAddress &
									  USB_EP_DESC_NUM_M));
				}
				else
				{
					//
					// Allocate the USB Pipe for this Bulk OUT endpoint.
					//
					g_USBHFTDIDevice.ulBulkOutPipe[InterfaceNo] =
						USBHCDPipeAllocSize(ulIndex, USBHCD_PIPE_BULK_OUT, // USBHCD_PIPE_BULK_OUT_DMA,
											pDevice->ulAddress,
											pEndpointDescriptor->wMaxPacketSize,
											0);
					//
					// Configure the USB pipe as a Bulk OUT endpoint.
					//
					USBHCDPipeConfig(ulIndex, g_USBHFTDIDevice.ulBulkOutPipe[InterfaceNo],
									 pEndpointDescriptor->wMaxPacketSize,
									 pEndpointDescriptor->bInterval,
									 (pEndpointDescriptor->bEndpointAddress &
									  USB_EP_DESC_NUM_M));
				}
			}
		}
    }

This part now works and does not report any errors however when ever I try to write to a port other than the first one I get an error at the following point (around line 1112) in usbhostenum.c

            else if(ulEPStatus & USB_HOST_OUT_ERROR)
            {
                g_sUSBHCD[ulIndex].USBOUTPipes[ulPipeIdx].eState = PIPE_ERROR;
                continue;
            }

To get to this point I had to change USBIndexWrite() and USBIndexRead() in usb.c which asserted on any endpoint other than 0-3.  But I cannot see why adding the remaining endpoints would cause a problem.

However if I setup the second interface first then this works and the first doesn't.  Does anybody have any experience with anything similar?

It seems to me that there is a weakness in the Starterware USB library when you try to use more than one set of IN and OUT endpoints, any ideas of what I could try or where I should be looking for the issue?

Many thanks

Sean