[LinuxPPS] PPS-echo implementation options - RFC

[tlhackque]

On 20-Sep-18 09:25, tom burkart wrote:
> Hi all,
> at the moment, the pps-echo implementation uses the leading edge of
> the PPS pulse to trigger the ECHO active transition.  It then uses an
> internal delay/timer to reset the ECHO to the inactive state.
>
> Another possibility would be to trigger the ECHO inactive transition
> from the PPS pulse inactive transition.  Ie the ECHO pulse would
> follow the PPS pulse exactly.  This would then mean that it is a true
> ECHO of the PPS pulse.
> Should this be the way the ECHO is implemented?
>
Yes.  However, some hardware doesn't interrupt on both edges.  In that
case, you probably do need a timer.

> Kind regards,
>
> Tom Burkart
> Consultant
>
> AUSSEC Mob: 04 1768 2202 Fax: 02 9526 1230
> 30 Waterside Crs, Carramar NSW 2163
>
>
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