Downloading FTDI dive log using desktop Subsurface on Android

[Willem Ferguson]

On 08/02/2017 13:36, Anton Lundin wrote:
>
> Basically you can't connect anything else to you phones usb-port than
> the USB-OTG cable. You might be able to use a USB-OTG-cable which
> injects power but nothing else. You might be able to use a usb-hub for
> the power inject, but I've never seen one which can feed power to a
> USB-OTG connected phone.
>
> Remember USB-OTG != USB. They are two completely different modes in the
> usb-hardware and software in your Android device.
>
> If you simultaneously need adb access, you need to enable adb over wifi,
> and connect to your Android device that way.
>
>
> //Anton
>
>

Anton, I need a bit of help here to understand how an OTG protocol would 
communicate with a normal non-OTG USB device like a dive computer. I 
have always assumed OTG is a software upgrade to the existing USB 
infrastructure that allows a device to become USB bus master and 
actively talk to other USB devices. Now I see that there are so-called 
OTG adapters that allows a memory stick to be OTG-compliant. Does this 
mean that only OTG-compliant devices can be accessed by Android? What 
exactly in hardware is required to get my phone to talk to a non-OTG 
dive computer? I happen to have a memory stick with a micro-USB plug as 
well as a full-sized USB plug. If I connect it to Android with the 
full-sized end, the OTG detector on my phone does not register it. If I 
switch to the micro-USB end of the memory stick, it registers an OTG 
device on Android. I need to understand what the equipment ramifications 
are for a diver with a FTDI-nased deive computer.

Kind regards,

willem