[time-nuts] looking for low-power system for gps ntp timekeeping
Bob Camp
lists at rtty.us
Mon Jul 1 09:49:04 EDT 2013
Hi
For a lot of what we do, having a board with 16 GPIO's and a couple of UART's pinned out is probably more important than 1.2 vs 1.7 GHz on the CPU(s). A lot of the Korean and Chinese boards seem to be aimed at driving a TV for streaming video. All the other stuff is probably still there. Getting at it on the bottom of a BGA - not so easy. The i/o connector on the Pi has it's issues, but at least it's there.
Of course for timing applications, having a couple of timers and some high speed capture pins is the ultimate goal. Externally accessible >=32 bit timers driven off a > 1 GHz clock would also be nice. I suspect all that's going to be a bit hard to find in a cheap generic board. Since all of these boards run a fairly complex OS, we'd also need kernel code to support them ...
Bob
On Jul 1, 2013, at 8:58 AM, "David J Taylor" <david-taylor at blueyonder.co.uk> wrote:
> Hi
>
> Is there a serial port on that board? NTP with USB serial is a bit clunky.
>
> Bob
> ===========================================
>
> Good point! I don't see one on that board, but the X2 has GPIO ports. Getting more expensive again, though....
>
> http://www.hardkernel.com/renewal_2011/products/prdt_info.php?g_code=G135235611947&tab_idx=2
>
> David
> --
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