[time-nuts] How to get PPS from ublox mini-PCI GPS to APU2 SoC serial port for ntpd

STR . strykar at hotmail.com
Thu Nov 3 12:58:27 EDT 2016


Hello again list and Paul,

The USB and Mini-PCIe converters I ordered from Ebay China have not shown up
yet.
It appears PC Engines may take a while to release the custom BIOS that
exposes UART3 and 4 on the APU2  :/

In the interest of getting this working without waiting on a BIOS I will try
connecting it to COM1, which is wired to the DB9 connector.
https://pcengines.ch/pdf/apu2.pdf

Before I fry a 3.3V board with 5V signals, I hoped to ask here and confirm
my ideas.


Do I cross RX and TX lines from the GPS pins to the RX/TX on the DB9/COM1
connector?
And straight connect the PPS line from the GPS to the DCD pin on the
DB9/COM1 connector?

GPS:
http://pcengines.info/forums/?page=post&id=B4D54F22-8224-4A67-9F9E-85F988A1F
888



Thanks!



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