[LinuxPPS] LinuxPPS evolution.

[Rodolfo Giometti]

On Tue, Nov 13, 2007 at 10:53:18AM +0000, Paul wrote:
> There have been a number of topics since I raised this problem. My
> opinion is:
> 
> 1. We do actually need some sort of ATOM driver. I know some of you were
> asking 'Why?'. There are a couple of reasons, the first being that there
> are actually some atomic clocks out there and secondly that cheap GPS
> modules do not provide reliable NMEA data.
> 
> 2. The CAT solution looks pretty weak if you are writing a HowTo for
> LinuxPPS (I'm working on one at the moment). It is just the thing to
> discourage a newbie.

I prefere calling it "workaround". ;)

> 3. Can't the OPEN be in ppsctl or something similar so you only have to
> do one thing to that port.

It could be possible. Maybe we can add an option like "-d" which
prevent the program in doing "exit()" and keep the file descriptor
open()ed.

> 4. Although it would be nice to use the rest of the serial port for
> something else is it necessary? There isn't much else today that uses
> that port.

You can do several open()s on a serial port. 

> 5. Perhaps the future is only to use the NMEA patch as general purpose,
> so the NMEA patch becomes renamed the PPS patch.
> 
> 6. By the way the NMEA patch is written against p2, are you sure it is
> still O.K. against p4? I was getting some odd segmentation faults, but I
> didn't have time to investigate further.

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