working on a ring0 singletask RTOS I have encountered an annoying problem regarding an USB UHCI controller. Testing board is an Intel Atom board D410PT with 1 EHCI and 4 UHCI companion controllers in the NM10 chipset.
I can send packets to a function, but responding IN packets from the function are ignored. The SETUP packet of the get_device_descriptor() arrives in the function, which then replies with the usual 18 bytes, but UHCI hardware sets the IN transfer descriptor as if nothing would have been sent back (C_ERR runs out and the CRC/Timeout bit is set in the status-field) . I analysed the actual USB data flow by controling the function's source code (on a SiLabs C8051F320 development kit) which works fine with Windows, Mac and Linux. Also the EHCI on the Atom board works fine!
After one week of searching this error I don't have any ideas left what is happening!
Is anybody out there able to give me any hint?
USB PICs and the UBW
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