On 01/02/2017 12:56, David Taylor wrote:
On 01/02/2017 10:59, Jakob Bohm wrote:
[]
As I am looking at the BBB myself, here are some extra questions:
1. Do you know if anyone has tried using the real-time coprocessors on
the BBB to more accurately track the PPS signal?
2. I presume the BBB could be put in a shielded case (I see some
offered online). Any experience with that?
Enjoy
Jakob
Jakob,
(1) No. Do you mean using the counters to record the timing of the PPS
more precisely?
No, I was thinking about the two "PRU" 200MHz low latency I/O
controllers on the chip, one of those could be made to run its own
little timing PLL loop directly watching the PPS GPIO pin, then
allowing the ARM CPU (running NTPD) to check the high resolution delta
between its own (NTP/Linux) time and the PPS synced loop.
(2) No, but without the BBB radiates more interference than the RPi.
Enjoy
Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark. Direct +45 31 13 16 10
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WiseMo - Remote Service Management for PCs, Phones and Embedded
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