I was just wondering if there is any visibility on USB OTG,. And specifically for me its the CDC/ACM....

Some of the STM32F4 family has two OTGs builit in - and I believe its a custom interface. Similarly some of the KinetisK families (MK66 , MK26) have two OTGs built - in this case FS and HS - and they are "standard interfaces" with same connector.
USB OTG HS starts as FS and then I understand chirps up to HS.
Of course USB3 is also an evolving high bar act.
From the point of view of low cost availability where the incremental cost is the USB micro connector, +pwr switch, I believe the FS and HS with basic API would at least define a skeleton on which features could be developed.

So just throwing out a few ? ? ?, in case someone has done any noodling on it. :)

thanks

--
Neil Hancock

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