Get PPS working with GPS #13
Description
I noticed in the course of debugging #12 that cgps / gpsmon aren't showing any PPS output from the GPS module... that would be pretty important to getting nanosecond-accurate time.
I see there are two PPS devices currently:
$ ls /dev | grep pps
/dev/pps0
/dev/pps1
But if I try querying them, I get nothing:
$ sudo apt install pps-tools
$ sudo ppstest /dev/pps0
trying PPS source "/dev/pps0"
found PPS source "/dev/pps0"
ok, found 1 source(s), now start fetching data...
time_pps_fetch() error -1 (Connection timed out)
time_pps_fetch() error -1 (Connection timed out)
time_pps_fetch() error -1 (Connection timed out)
(Same for PPS1).
gpsmon shows no PPS available:
