Hi,all
I am working on usb host controller ,which implements EHCI .
the problem is the host couldn't identify the usb device sometimes.
for example,the first time the usb device plugged in the usb host can
be identified.
but couldn't the twice ,or serval times later.
the main error is : babble error,which can be seen by the EHCI
qTD->token : 0x00070d50
and I get -ECONNRESET in ehci_urb_done();
also the debug msg in "ehci-q.c : ep0in status -104 len 24/31."
display in console
right after i plug out the device.
I have serval questions:
1/the babble error ,defined in EHCI /UHCI spec that it was
cause by device sends more data than host expects.
why it happens when it is "24/31" (host gets short packet data) ?
2/what hardware issue cause the babble error ? maybe i can modify
hardware pheriphal to improve usb signal.
best regards!
--------------
JackRain
2006-12-18
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