[sdiy] USB Question

[John Speth]

The high hurdle for USB host implementation is the firmware USB
middleware.  Some can get quite complicated.  Some chip makers will supply
the common ones.  You can also buy them.

JJS

On Tue, Sep 22, 2015 at 11:28 PM, Vladimir Pantelic <vladoman at gmail.com>
wrote:

> On 23.09.2015 08:10, Tim Ressel wrote:
> > HI-Dee Ho!
> >
> > I need to design a usb interface that does both host and device, but not
> > at the same time. There will be an A and B connector on the front
> > panel.  All of the procs I've looked at only have one USB interface.
> > I'm guessing the thing to do here is to use a USB switch.  Anyone have
> > some insights?
> >
> > Thanks!
>
> many CPU'S have a so called USB-OTG (on the go) interface that allows to
> switch roles between host and device.
>
> normally switching to host mode is done by inserting a cable that has
> the ID pin (the 5th pin on a USB mini/micro connector) grounded, but it
> can of course also be done under SW control.
>
> look at e.g. the STM32F105, it has a: "USB 2.0 full-speed
> device/host/OTG controller with on-chip PHY that supports HNP/SRP/ID"
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-- 

John Speth, Software Engineer, Avnera
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