David Taylor wrote:
On 18/11/2012 09:28, Uwe Klein wrote:
David Taylor wrote:
Which part of the article or what keyword should I be looking for?
UpFront: haven't played around with the raspberry yet.
My understanding was that your /dev/pps0 entry appeared too late.
( instantiated late by udev )
is the module "pps-gpio" loaded during system startup ?
lsmod ...
other ref:
https://github.com/davidk/adafruit-raspberrypi-linux-pps
http://www.raspberrypi.org/phpBB3/viewtopic.php?f=9&t=1970
uwe
Thanks, uwe. I've been using the pages you list as a guide.
On a working (with PPS pulses) system:
cat /etc/modules contains "pps-gpio"
lsmod shows:
pps_ldisc used by: 2
pps_gpio used by: 1
pps_core used by: 4 pps_gpio,pps_ldisc
On a system with nothing connected to the PPS:
cat /etc/modules contains "pps-gpio"
lsmod shows:
pps_gpio used by: 0
pps_core used by: 1 pps_gpio
I'm unsure how to interpret the difference, or what pps_ldisc does.
what happens if you "insmod pps_ldisc" into the "not ready" system?
you may need a call to ldattach afterwards:
http://net.its.hawaii.edu/network-performance/using-praecis/
"grep" your way through the udev scripts !?
uwe
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