Editing Raspberry Pi NTP Server (section)

=== Test pentru UART si PPS ===
Dupa conectarea modulului GPS si configurarea UART/PPS, putem verifica functionarea celor doua interfete direct din sistem.

==== Test UART (NMEA) ====
Pentru a verifica daca modulul GPS transmite date NMEA prin UART:

<code class="mw-code mw-highlight plainlinks" style="display:block"><!--
-->&#32;<b># cat /dev/serial0</b>
&#32;$GNRMC,140221.00,A,4423.43286,N,02605.77991,E,0.096,,250226,,,A,V*14
&#32;$GNVTG,,T,,M,0.096,N,0.178,K,A*3C
&#32;$GNGGA,140221.00,4423.43286,N,02605.77991,E,1,10,2.11,105.1,M,34.9,M,,*44
&#32;$GNGSA,A,3,10,23,15,29,16,26,27,18,,,,,3.30,2.11,2.54,1*00
&#32;$GNGSA,A,3,02,25,,,,,,,,,,,3.30,2.11,2.54,3*07
&#32;.............
</code>

Acest rezultat confirma faptul ca Pi-ul primeste date GPD de la modul
Daca totul este configurat corect, ar trebui sa apara siruri NMEA. In cazul in care nu apare asemenator mai sus, verificati conexiunile RX/TX si setarile UART.

==== Instalare unelte PPS si testare ====
Pentru testarea semnalului PPS, instalati pachetul necesar:

* apt install pps-tools

Dupa instalare, verificam semnalul PPS:

<code class="mw-code mw-highlight plainlinks" style="display:block"><!--
-->&#32;<b># ppstest /dev/pps0</b>
&#32;trying PPS source "/dev/pps0"
&#32;found PPS source "/dev/pps0"
&#32;ok, found 1 source(s), now start fetching data...
&#32;source 0 - assert 1769914968.660167945, sequence: 330 - clear  0.000000000, sequence: 0
&#32;source 0 - assert 1769914969.660165119, sequence: 331 - clear  0.000000000, sequence: 0
&#32;source 0 - assert 1769914970.660164293, sequence: 332 - clear  0.000000000, sequence: 0
</code>

Un rezultat corect va afisa impulsuri detectate la fiecare secunda.