It looks like you would have to level-convert the 3 volt PPS to connect to one of the GPIO pins. It is easy to make a level converter with a FET or you can buy one for $3 from Adafruit or spark fun. As for the serial data, that will be easy as there seems to be a 3 volt serial port.
The direct connection that was suggested might work or might not it depends on some details we don't know. Seems like a good low power embedded PC. Very much over kill for just running NTP but I assume this will do other things too. On Sat, Aug 13, 2016 at 7:32 PM, STR . <[email protected]> wrote: > Hi, > > > > I recently bought 2 ublox PCI-5S mini-PCI GPS modules and have ordered a > PCengines APU2C4 board I hope to install it in. > > Others have found it can provide PPS output http://emerythacks.blogspot. > in/2013/01/u-blox-pci-5s-cheap-gps-module-for-your.html > > > > This is the x-64 AMD SoC by PCengines - http://www.pcengines.ch/apu2c4.htm > > Schematics - http://www.pcengines.ch/schema/apu2c.pdf > > User manual (Page 8 has a nice overview of the board) - > http://www.pcengines.ch/pdf/apu2.pdf > > > > I would like to install and power the GPS from the mini-PCI slot and > output PPS directly on to one of the serial ports on the SoC board for ntpd. > > Since mini-PCI uses 3.3V and serial uses 5V I guess, I'm not sure how to > achieve this and am concerned I might fry the board. > > > > Do I need a MAX 232 voltage converter? > > Can this be done using the mini-PCI slot for power? > > > > I have posted my issue on the PCengines forum and got 1 response so far > that suggested I connect to COM3 on the GPIO header - > > http://www.pcengines.info/forums/?page=post&id=B4D54F22- > 8224-4A67-9F9E-85F988A1F888&fid=DF5ACB70-99C4-4C61-AFA6-4C0E0DB05B2A > > I'm not sure where exactly, these are the GPIO pins on the board > http://imgur.com/a/bAZLb > > > > When someone says "LPC serial IRQ and system interrupt latency will add up > to noticeable jitter" does that mean the jitter would be equally bad from > any serial port on the board or just from the 3rd serial off the GPIO pins? > > Here, someone else claims the PPS should have less jitter in a similar > setup - http://pcengines.info/forums/?page=post&id=CD275C4D-8050- > 408A-BD16-6F50468C74C2 > > > > I'm hoping someone here could help me out with this as I'm well in over my > head by now. > > > > > > > > Cheers, > > S > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > -- Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
