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What hardware do we require to generate a PPS in the GPIO pins? #4
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Hi!
Do you mean that you want to make your RPi a PPS source? If it's the case, I have been looking into it for a while some time ago and pps-generator.md is what I come up with. Once you trust your RPi's clock as a precise source, you can drive a GPIO pin with a PPS pulse. Please note that the driver implemented in patches/0001-pps-add-gpio-PPS-signal-generator.patch is very likely subject to the same issue described here for the parallel port driver this one is based on which is marked as broken in kernel config infrastructure.
I don't understand what you are trying to do here... |
Thank you so much for the great advice.
In my second query, I am just trying to ask that, Can I use my computer as
the grandmaster clock and synchronise it with the RPI3. If yes, then what
is the best method of connecting the computer to the RPI3 to get the time
synchronisation?
Regards,
Maman
…On Thu, May 2, 2019 at 2:33 PM Andrea Galbusera ***@***.***> wrote:
Hi!
1. First I would like to ask what hardware do we require to generate a
PPS pulse in the GPIO of the RPI and how to transfer it to data acquisition
board (which is LOGI-PI in this case) for sampling the data?
Do you mean that you want to make your RPi a PPS source? If it's the case,
I have been looking into it for a while some time ago and pps-generator.md
<https://github.com/twteamware/raspberrypi-ptp/blob/master/pps-generator.md>
is what I come up with. Once you trust your RPi's clock as a precise
source, you can drive a GPIO pin with a PPS pulse. Please note that the
driver implemented in patches/0001-pps-add-gpio-PPS-signal-generator.patch
<https://github.com/twteamware/raspberrypi-ptp/blob/master/patches/0001-pps-add-gpio-PPS-signal-generator.patch>
is very likely subject to the same issue described here
<https://groups.google.com/forum/#!topic/fa.linux.kernel/4iFqiQ3u_LE> for
the parallel port driver this one is based on which is marked as broken in
kernel config infrastructure.
1. Can we connect the computer with the RPI3 and make the computer as
the grandmaster clock synchronising RPI in micro-sec (like through USB to
UART connection- laptop to RPI3) treating the RPI as the master and then
slave clock with a computer as grandmaster clock?
I don't understand what you are trying to do here...
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I spent days over days and I still cannot get the PPS output to work. |
Hi,
I am new to RPI and the PTP concept.
Thanks a mil in advance.
Best Regards.
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