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USB On-The-Go

(computer.rip)
208 points jnord | 1 comments | 03 Jan 25 12:42 UTC | HN request time: 0.209s | source
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MarkusWandel ◴[07 Jan 25 15:40 UTC] No.42623539[source]▶
USB-C has obfuscated things but I was hoping the following would work:

Buy a Y-cable from Ali Express that has USB-C male to plug into the phone, and both USB-C female and USB-A female sockets. Plug keyboard into the USB-A and the charger into USB-C.

But it doesn't work, and I suspect it's a software limitation at least on my phone (Moto G Play 2023). If the charger is plugged in first, the phone will charge but not use the keyboard. If the keyboard is plugged in first, the phone will use it, but not charge. I think the wires are there to make it all work, but the phone's OS just doesn't support this scenario. Pity.

Needless to say documentation is nonexistent so I don't actually know what's in the cable. For all I know, the two female sockets are just connected in parallel.

replies(4): >>42623759 #>>42623866 #>>42624960 #>>42629514 #
1. Gigachad ◴[08 Jan 25 00:32 UTC] No.42629514[source]▶
There is no such thing as a spec compliant USB Y cable. Unless it's got some kind of internal USB hub. There is nothing the spec designers can do to account for non complaint ali express junk.