FGPMMOPA6H GPS manual
- PA6H provides 1 PPS (pin 13) after 3-D Fix at 2.8 V (p. 7, 13)
- 3.3V external antennas may draw up to 28 mA (p.15)
- Vcc 3.3 V, 25 mA
- NMEA: GGA, GSA, GSV, RMC, VTG over 2.8 V TTL (p. 17)
Adafruit describes the setup using the PA6H GPS module and Raspberry Pi as an NTP server. Note that the Raspberry Pi has 3.3 V logic so level shifters may be necessary to/from the 2.8 V GPS IO.
NMEA over UART
Red Pitaya NMEA over UART: starting with the
Red Pitaya UART Example in C,
one could scoop up the NMEA and extract the current time using a 1PPS driven interrupt.
Perhaps one could use
/dev/ttyPS1 to use the Red Pitaya UART from Python.
Red Pitaya UART electrical connection
is to pins 7 and 8 of connector E2.
This would not be for setting the clock accurately like NTP, but rather for determining which second the 1PPS tick occurred at. This technique (with different hardware) was used for the HiST auroral tomography system.