Subject:
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The USB tower toggle question.
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 16 Jan 2002 17:58:47 GMT
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Original-From:
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PC CHAN <PC.CHAN@ALCATEL.COMspamcake>
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Viewed:
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677 times
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Hi there,
As not everybody was able to get the legousbtower to work with nqc, I am
trying to look into what make usb-uhci failed to work with nqc on my
setup while uhci worked.
One observation I made was that usb-uhci would skip dma'ing the data
across if urb looked the same as the previous urb. It makes the retries
attempts from the nqc useless. (In uhci, it dma'ed the retries across.)
It may have something to do with the "toggle" bit in usb->pipe. It is
the same bit referred to by the pipedata in usb.h.
Would anybody know how this bit should be used? Should legousbtower
toggle the toggle bit on every send?
Regards,
P.C.
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