Hi. I wonder if anyone can help? I have a question about getting PPS to
gpsd from a gps via GPIO pins using a Raspberry PI.
I have an Ultimate GPS Breakout V3 board
https://www.adafruit.com/products/746
I have connected the PPS pin directly to my Pi via GPIO pin 18.
I have added the following line to /boot/config.txt
dtoverlay=pps-gpio,gpiopin=18
When I boot the pi I get the following:
[ 9.859705] pps_core: LinuxPPS API ver. 1 registered
[ 9.863843] pps_core: Software ver. 5.3.6 - Copyright 2005-2007
Rodolfo Giometti <address@hidden>
[ 10.052295] pps pps0: new PPS source pps.-1
[ 10.054528] pps pps0: Registered IRQ 412 as PPS source
[ 14.209399] pps_ldisc: PPS line discipline registered
Looking good so far... Do a quick test to see if we have any ticks!
sudo ppstest /dev/pps0
trying PPS source "/dev/pps0"
found PPS source "/dev/pps0"
ok, found 1 source(s), now start fetching data...
source 0 - assert 1457520369.538064030, sequence: 180812 - clear
0.000000000, sequence: 0
source 0 - assert 1457520370.538051840, sequence: 180813 - clear
0.000000000, sequence: 0
source 0 - assert 1457520371.538039843, sequence: 180814 - clear
0.000000000, sequence: 0
Yes... we are cooking.
I connected the TX and RX (of the break out) to a serial to USB adapter
like this https://www.adafruit.com/products/954