PORTS Forum

Ports and Interfaces => USB => Topic started by: Pat Crowe on February 15, 2012, 09:53:44 am

Title: Anyone seen a successful LPM transaction?
Post by: Pat Crowe on February 15, 2012, 09:53:44 am

I have two devices claiming LPM support, but neither appears to acknowledge an apparently valid LPM transaction. Does anyone have a capture of a working LPM transaction?

Title: Re: Anyone seen a successful LPM transaction?
Post by: Pat Crowe on February 15, 2012, 03:40:11 pm

Incidentally I noticed a previous LPM question post here which asked what value of Endpoint should be specified. I had the same puzzle recently. Jan suggested, as I also recently concluded, that as it was the device being put to sleep, then endpoint 0 was appropriate. Today I noticed that the errata to the LPM ECN actually now specifies:

"The value of the endpoint field shall be 0."

Title: Re: Anyone seen a successful LPM transaction?
Post by: Jan Axelson on February 15, 2012, 04:48:41 pm

Interesting update on that.

Unfortunately I don't have an LPM capture.

Jan