I mentioned a bit earlier today that I'm avoiding OS'es due to boot time=20
or even wake time... it will be battery powered.  The camera needs to=20
start recording ASAP after getting a trigger signal from one of a few=20
sources, and then waking up.  USB will introduce another delay..

On the other hand, I did mentally tinker with the idea of just stopping=20
the clock on an R-Pi and shutting down most peripherals. On power up.a=20
small PIC or other uC could re-power-up all peripherals on the Pi and=20
re-start the clock to the R-Pi and it *should* be none the wiser.  But I=20
still want to learn about video, so not pursuing this option currently.

Cheers,
-Neil.


On 3/8/2018 7:10 PM, James Cameron wrote:
> I'd look for a USB camera sensor with mpeg built-in, so that the host
> CPU would only need;
>
> - a USB controller and stack,
>
> - an SD controller and stack,
>
> - a filesystem stack,
>
> - probing for the USB device and asking for the stream,
>
> - reframing the stream into whatever format is desired.
>
> An RTOS of some sort would be handy.
>
> A complete OS just makes it too easy, no challenge.
>
> For quick hackable prototypes, perhaps BeagleBone or a Raspberry Pi
> Zero with camera.  The latter would take me about half an hour to
> configure for the application described in this thread; camera to
> microSD card.
>

--=20
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