[time-nuts] looking for low-power system for gps ntp timekeeping

[Bob Camp]

Hi


On Jul 1, 2013, at 4:02 PM, Hal Murray <hmurray at megapathdsl.net> wrote:

> 
> Bob Camp <lists at rtty.us> said:
>> Since all of these boards run a fairly complex OS, we'd also need kernel
>> code to support them ... 
> 
> Most OSes already have support for PPS capture on modem control pins so it 
> shouldn't be too hard to add support for GPIO pins.  (I'm not claiming it 
> would be trivial, just a lot simpler than starting from scratch.)

The reference I was making was to a "pie in the sky" 1.8 GHz clocked timer integrated into a CPU chip. That would let you come up with ~ 600 ps timing directly. Since it would be both unusual and very fast, a driver (potentially tightly linked to the kernel) would be needed. That's not a trivial thing….

Bob


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