Detecting Usb Enumeration error

[elettro86]

Hi guys,

I am developed USB device protocol. My stack work fine and the device is correctly enumerated by the host. I assume that the enumeration process is correctly terminated when a set_configuration is send by the host, so I have "an event" in order to detect when the device is correcly enumerated.

But if the enumeration failed, how I can detect this error? I could use a time-out (if a set_configuration is not receive in 10sec i.e.) but it it is potentially dangerous, I could assume uncorrect decision based on my time out.

Can anyone help me?

Sorry for the bad English

King Regards

Francesco

[CarlosCasillas]

Hi Francesco,

The enumeration time may vary depending the Host (and its Operating System). On the following link you could find some useful information regarding enumeration process on Windows:
http://blogs.msdn.com/b/usbcoreblog/archive/2009/10/31/how-does-usb-stack-enumerate-a-device.aspx

Additionally, you may find additional information at the following thread:
https://community.freescale.com/message/107572

Hope this will be useful for you.

Best regards!

/Carlos