fengwei yin wrote:
I need guidance About the TD queue processing.
Let me take usb_set_address as example.
Before TD queue processing,the TD queue as following:
TailP
|
|
V
HeadP---->dummy TD------>td[0]------>td[1]
Erm, no. It should be
HeadP -> td[0]/SETUP -> td[1]/STATUS -> dummy
TailP -> dummy
After TD queue processing,the queue as following:
HccaDoneHead---->td[0]----->dummy TD
Then
HeadP -> dummy
TailP -> dummy
which is to say, an empty queue. And if no other endpoint
was working, the donelist would be
hcca DoneHead -> td[1] -> td[0] -> NULL
Which is why the donelist gets reversed (to td[0] then td[1])
before it's processed.
- Dave
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