Hello There,
I'm writing embedded code on a mass storage device and
I'm having a little trouble getting the right specification for
DATA0 / DATA1 packet marking. The USB 1.1 spec doesn't really cover
this and I can't find the part of the 2.6.5 source where this is covered.
My understanding is that after configuration the first packet from the PC
to the device's BULKOUT will be a DATA0 and then a DATA1 and then
alternating
until any reset when DATA0 is used again. This alternation is carried on
without
regard to the different CBW / DATATRANSFERS / CSW transactions.
My lack of understanding is whether the BULKIN endpoint uses the _SAME_
DATA0 / DATA1 sequence
or a seperate sequence of it's own. All the diagrams in the specs do not
show this sort of activity.
Do I need two variables (one per endpoint) to hold the PID or just one?
i.e.OUT 0 IN 1 IN 0 OUT 1 IN 0 OUT 1 OUT 1 etc
or OUT 0 IN 0 IN 1 OUT 1 IN 1 OUT 1 OUT 0 etc
So can anyone either direct me to the correct files
"/usr/src/linux/drivers/usb/??"
that contain the linux end of things or explain the spec.
Thanks in Advance
Bill
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