Hi All, As my first attempt to technical writing, I have put up 3 in-depth tutorials (on USB 2.0, USB 3.0 and UPnP device architecture) at
Cheers
--------------------------------------- Posted through
Hi All, As my first attempt to technical writing, I have put up 3 in-depth tutorials (on USB 2.0, USB 3.0 and UPnP device architecture) at
Cheers
--------------------------------------- Posted through
I'm not going to go through it in detail, but I had a quick look at your USB 2.0 tutorial and I noticed the following:
1) Your diagram showing the endpoints connecting to the configuration descriptor is wrong. Endpoints are owned by the interface descriptor and there can be multiple interfaces per configuration descriptor.If you want a real world example of that, have a look at the descriptor setup for a CDC based serial port.
2) From your document: | Thus EP1 IN will be addressed as 0x10 and EP1 out will be addressed as 0x18That is wrong; you have the nibbles reversed.
3) You need to distinguish between a control endpoint protocol stall and the "something has gone badly wrong" :-) stall.Protocol stalls are normal and expected; a search of your document does not show the phrase "protocol stall" anywhere.
Hope this helps,
Simon.
-- Simon Clubley, clubley@remove_me.eisner.decus.org-Earth.UFP Microsoft: Bringing you 1980s technology to a 21st century world
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