[LinuxPPS] ntpd

[Rodolfo Giometti]

On Thu, Aug 03, 2006 at 05:33:16PM +0200, Folkert van Heusden wrote:
> 
> Aug  3 17:31:17 keetweej kernel: [43017402.680000] drivers/pps/pps.c: New message from PID 23930 (flags 0)
> Aug  3 17:31:17 keetweej kernel: [43017402.680000] drivers/pps/pps.c: PPS_FETCH: source 7
> Aug  3 17:31:18 keetweej kernel: [43017403.680000] drivers/pps/pps.c: New message from PID 23930 (flags 0)
> Aug  3 17:31:18 keetweej kernel: [43017403.680000] drivers/pps/pps.c: PPS_FETCH: source 7
> Aug  3 17:31:19 keetweej kernel: [43017404.680000] drivers/pps/pps.c: New message from PID 23930 (flags 0)
> Aug  3 17:31:19 keetweej kernel: [43017404.680000] drivers/pps/pps.c: PPS_FETCH: source 7
> Aug  3 17:31:20 keetweej kernel: [43017405.680000] drivers/pps/pps.c: New message from PID 23930 (flags 0)
> Aug  3 17:31:20 keetweej kernel: [43017405.680000] drivers/pps/pps.c: PPS_FETCH: source 7
> 
> keetweej:/usr/src/ntp-dev-4.2.1p255-RC# cat /proc/pps/07/*
> 1154612886.4319000 #16733
> 1154612885.204319000 #16729
> keetweej:/usr/src/ntp-dev-4.2.1p255-RC# cat /proc/pps/07/*
> 1154612886.4319000 #16733
> 1154612885.204319000 #16729
> keetweej:/usr/src/ntp-dev-4.2.1p255-RC# cat /proc/pps/07/*
> 1154612886.4319000 #16733
> 1154612885.204319000 #16729
> keetweej:/usr/src/ntp-dev-4.2.1p255-RC# cat /proc/pps/07/*
> 1154612886.4319000 #16733
> 1154612885.204319000 #16729
> keetweej:/usr/src/ntp-dev-4.2.1p255-RC# cat /proc/pps/07/*
> 1154612886.4319000 #16733
> 1154612885.204319000 #16729
> keetweej:/usr/src/ntp-dev-4.2.1p255-RC# cat /proc/pps/07/*
> 1154612886.4319000 #16733
> 1154612885.204319000 #16729

Each time you read "/proc/pps/07/*" you get the same output? No
changes? If so this means that your GPS antenna is stopped PPS pulse
generation.

> /proc/pps/X/*
> where X < 7 are all 0 and stay 0
> so I changed ntpd to:
> time_pps_findsource(7, path, 40, id, 40);

Good choice! Verify that PPS source #7 is connect with the right
serial port.

> IMPORTANT:
> if I have time_pps_findsource(1, path, 40, id, 40);, /proc/pps/01/assert and clear STAY 0!!

I don't understand what do you mean. Why you should use PPS source #1
when your device is connected with #7?

Ciao,

Rodolfo

-- 

GNU/Linux Solutions                  e-mail:    giometti at enneenne.com
Linux Device Driver                             giometti at gnudd.com
Embedded Systems                     		giometti at linux.it
UNIX programming                     phone:     +39 349 2432127
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