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I have a Trimble Thunderbolt GPS that generates a super-accurate PPS signal that I'd like to connect to a Galileo GPIO port and then to NTP for a Stratum 1 NTP server. Has anyone done this or have any suggestions. I did see some posts about getting PPS working in the kernel; but then nothing about the final step of interfacing that to NTP.
Thanks in advance!
Clay Jackson
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Hello N7NM,
I personally haven't tried this but I found . There, the user AlexT provides a way to get NTP into your image, I suggest you to check it out.
I see you already checked , I believe that thread is very helpful in regards to pps. So, you could combine the information in both threads in order to continue with your project. I hope this helps.
Let us know,
Peter.
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Hello N7NM,
I personally haven't tried this but I found . There, the user AlexT provides a way to get NTP into your image, I suggest you to check it out.
I see you already checked , I believe that thread is very helpful in regards to pps. So, you could combine the information in both threads in order to continue with your project. I hope this helps.
Let us know,
Peter.
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Peter - very good! I think I'm about 95% of the way there. Two more questions, if I may - the NTP PPS drivers normally access the PPS by an entry in /dev - I assume in this case that would be the same path that you used for the asserts in the pps-gpio thread. Also, can you tell me if the GPIO inputs will tolerate TTL levels (5V) or are they 3.3V only.
Will keep you posted on my progress!
Thanks!
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I believe you are correct. The way to access the PPS is probably in /sys/class/pps/pps0/assert.
As you can see in http://www.intel.com/content/www/us/en/support/boards-and-kits/intel-galileo-boards/000005735.html Galileo Datasheet under Arduino Shield Supported Features, Galileo's IO supports 3.3v or 5v. This can be set with the IOREF jumper:
Peter.

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