Difference between revisions of "Time synchronization"
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To test the pps functionality, the command-line-tool <code>ppstest</code> may be used (install with <code>sudo apt install pps-tools</code>). | To test the pps functionality, the command-line-tool <code>ppstest</code> may be used (install with <code>sudo apt install pps-tools</code>). | ||
| − | [[File: | + | [[File:Ppstest-screen.png|thumb|Checking the timepulse signal with ppstest.]] |
Revision as of 13:40, 10 March 2021
This tutorial describes, how to set up the time synchronization of the system clock by disciplining the kernel of the RPi with the Ublox's PPS (Pulse-Per-Second) signal using chronyd.
Install the pps kernel driver module
Edit the /boot/config.txt and add the following line:
dtoverlay=pps-gpio,gpiopin=18
This will activate the kernel pps driver module at startup listening to GPIO pin 18 to which the timepulse output of the uBlox is connected on the MuonPi HAT board. After a restart, one should see the activated driver in the kernel module list.
To test the pps functionality, the command-line-tool ppstest may be used (install with sudo apt install pps-tools).
