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From: "Carlos E.R." <robin_listas@es.invalid>
Newsgroups: sci.electronics.repair
Subject: Re: USB functionality.
Date: Wed, 13 Mar 2024 14:47:00 +0100
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On 2024-03-09 23:09, Roger Hayter wrote:
> On 9 Mar 2024 at 21:54:51 GMT, "Andrew Smallshaw" <andrews@sdf.org> wrote:
> 
>> On 2024-03-09, peter@easthope.ca <peter@easthope.ca> wrote:
>>>
>>> This photo,
>>> https://commons.wikimedia.org/wiki/File:USB-OTG_Setup_IMG_2342.JPG
>>> suggests, to me at least, that the phone can be charged while the
>>> keyboard, mouse and flash store are used.  True?
>>
>> There are altogether too many unknowns here.  Looking at the date
>> of the photo - 2015 - some phones of that era could support USB
>> OTG but were unable to supply power to connected peripherals,
>> meaning you would need a Y cable to supply that separately.  Others
>> could do the job inclusive of power delivery, others couldn't work
>> in OTG mode at all.  Generally you couldn't use OTG and charge
>> simultaneously, it's a role reversal that early USB wasn't designed
>> for.
>>
>> Things are different with USB-C but of course that is much later.
> 
> But can even USB-C accept a signal input (keyboard and mouse for instance) and
> unrelated signal output (audio for instance) on the same physical socket? I
> ask only out of curiosity.

Certainly.

That's normal USB functionality. It is a bus. You need a hub, though, in 
order to split the cables, one for each device.

The only problem is which device supplies the power and in what direction.

-- 
Cheers, Carlos.