USB Enumeration Logic

[Celestie84]

Can anyone pls clarify me how is the logic flow of the enumeration process? (such as when are the descriptors, packets coming one after another)

Thank you

 

[zevon8]

enumeration is done by device class, ie how it will require/process data.

have a look here:

https://www.tech-pro.net/intro_usb.html

 

[checkmate]

USB enumeration is partly dependent on the usbd driver and partly dependent on the functional driver. I've seen win98/win2k/winxp/wince enumerations and they all differ from each other. You should code your firmware to be able to handle all USB enumeration requests, and not try to enumerate them in a particular sequence.