[sdiy] Does usb c alternative mode allow analog signals on the multi-purpose pins?

[Chromatest J. Pantsmaker]

$9 on Amazon.. And it has a "picture" of the circuit board in the images.

On Thu, Nov 17, 2022 at 3:30 PM cheater cheater via Synth-diy <
synth-diy at synth-diy.org> wrote:

> Yep, there are ones with codecs in them. You probably want /an even
> cheaper one/. Which exact one did you get? How much was it?
>
> The cheapest ones might be the passive ones - but who knows. You can
> find a schematic in appendix A of the doc that Chromatest posted. It's
> on page 312. The next page has a schematic of that + a charger input
> port.
>
> The page 312 schematic only has the usb c plug / port, the 1/8" jack
> with a plug-present switch, and wires. That's it. You can build it
> yourself quite easily either by cutting off a usb c cable, or by
> getting a usb c breakout pcb.
>
>
> On Thu, Nov 17, 2022 at 11:23 PM Eric Brombaugh via Synth-diy
> <synth-diy at synth-diy.org> wrote:
> >
> > I bought one of those cheap USB C headset adapters as an experiment to
> > see how well they work.
> >
> > https://www.amazon.com/gp/product/B07XYQ2ZKH
> >
> > Physically it's tiny - barely larger than the USB and 3.5mm connectors
> > (plus short cable between them). Tried it out and it worked well, but
> > then as I dug deeper it turns out that it's *not* passive - it actually
> > has a full codec + amps inside. Plugging it in enumerates a device on
> > the bus that's unrelated to my laptop's built-in audio:
> >
> > ID 0572:1b09 Conexant Systems (Rockwell), Inc. Hi-Res Audio
> >
> > Amazing.
> >
> > On 11/17/22 02:31, cheater cheater via Synth-diy wrote:
> > > If you go to amazon, you'll find nearly infinite USB C to headset
> > > adapters following this standard, and they're as cheap as 4 euro.
> > > They'll probably work well, too - even the worst C plugs I've
> > > encountered on cheap cables are still very resilient. The mini jack on
> > > the other hand, I mean who knows, but it'll probably take a bunch of
> > > cycles. The more expensive ones are up to 10 euro, but not more.
> > >
> > > On Thu, Nov 17, 2022 at 10:25 AM cheater cheater
> > > <cheater00social at gmail.com> wrote:
> > >>
> > >> Thanks for the pointer to the spec. Appendix A talks about passive
> > >> audio adapters from USB C to headset TRRS. That includes both input
> > >> and output analog signals on the pins of a USB C port.
> > >>
> > >> Glad that you linked me to the pdf, the last time I tried searching
> > >> for USB specs I found something completely different and it didn't
> > >> answer my question.
> > >>
> > >> On Tue, Nov 15, 2022 at 9:23 PM Chromatest J. Pantsmaker
> > >> <chromatest at azburners.org> wrote:
> > >>>
> > >>> "NOTE: Adopters may only use the USB Type-C® cable and connector to
> implement USB or third party functionality as expressly described in this
> Specification; all other uses are prohibited."
> > >>> From:
> > >>>
> https://www.usb.org/sites/default/files/USB%20Type-C%20Spec%20R2.0%20-%20August%202019.pdf
> > >>>
> > >>>
> > >>> On Tue, Nov 15, 2022 at 11:08 AM cheater cheater via Synth-diy <
> synth-diy at synth-diy.org> wrote:
> > >>>>
> > >>>> As in subject. Is there anything in the spec that speaks against
> this?
> > >>>> Where would one go in order to get a definitive answer to this?
> > >>>> _______________________________________________
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