On Fri, 8 Mar 2002, Carlos Parada wrote:
>
> Hi Jose,
>
> Thanks for your answer. However I guess that I don't have too much knowledge
> about this. I suppose that there are no implementations, and I must develop
> my own application/functions to do that.
There could be an implementation of this already. The only problem
is to find it.
> In my scenario I will use one pin to transport the PPS signal in a serial
> port (RS232), and my solution should be the Real Time ISR ... Can you tell
In order to use the serial port you have to make sure that your
GPS is configured to generate serial PPS data, or probably any data that
is spill one a second by the GPS is controlled somehow by the PPS signal.
Probably an easier solution for you, if your GPS supports
TTL (0-5V) PPS signals, is to generate an interrupt in the parallel port.
You can attach an ISR to the parallel port for this.
> me when I can find documentation and mainly examples of what I should do to
> set up the synchronisation?
>
The RTLinux distribution comes with some examples and
documentation. That's a good starting point. You may be able to start a
task every second based on the data that you get on the serial port. If
you use the parallel port option, you can start a task every time you get
an interrupt. This task should do whatever your sinchronization is about.
> Thanks a lot.
>
> Best regards.
>
> Carlos Parada
>
> **********
> Carlos Fonseca Parada
> Portugal Telecom INova��o, S.A.
> MSI - Multim�dia e Servi�os IP - Redes MultiServi�o
> * Rua Eng� Jos� Ferreira Pinto Basto - 3810 Aveiro - Portugal
> Tel +351 234 403317 Ext: 1317
> Fax +351 234 420722
>
>
> > -----Original Message-----
> > From: Jose Guilberto [SMTP:[EMAIL PROTECTED]]
> > Sent: Friday, March 08, 2002 3:58 PM
> > To: Carlos Parada
> > Cc: '[EMAIL PROTECTED]'
> > Subject: Re: [rtl] Time Synchronization
> >
> >
> > Hello,
> >
> > On Fri, 8 Mar 2002, Carlos Parada wrote:
> >
> > > Hi all,
> > >
> > > I would like to use the RTLinux with a GPS antenna (Trimble) for a very
> > > precise synchronisation. However, I'm very confused about what can be
> > made
> > > in RTLinux, what kind of protocols can be used and which pins should be
> > used
> > > to transport the PPS signal.
> > >
> > You should be able to use a "Real Time ISR" or a "Real Time
> > Periodic Task" for this. The pin that you should use depends on the
> > hardware and if you are using an "RTLinux ISR" or an "RTLinux Periodic
> > Task".
> >
> > For an RTLinux ISR you should use a pin that can trigger an
> > interrupt. For an RTLinux Periodic Task you should be able to use any pin
> > that you can read from (parallel port) and poll it's value constantly. The
> >
> > only problem with polling is that your precision depends on how fast you
> > do the polling. You may be able to connect the 0-5 V. PPS signal to the
> > pin in the parallel port that triggers interrupts and use a RTLinux ISR.
> > The only problem here is the PC's parallel port speed.
> >
> > If you have money (and that knowledge) you should be able to use a
> > PCI card to trigger interrupts.
> >
> > > I'm studying different scenarios of configuration and I would like to
> > know
> > > if they are possible or not.
> > > The better solution for me (less expensive) is the possibility of
> > > synchronises the PC through a RS323 cable, receiving a TSIP and PPS
> > signals.
> > > However, I don't have reached any information about the support of the
> > > RTLinux of this capability, or any way to make it support.
> > > The solution of receiving the NTP and PPS signal via RS232, is also a
> > > possibility (more expensive). Anybody knows if either the RTLinux
> > supports
> > > this, or need any software more.
> > >
> > There is an RTLinux driver for the serial port (RS232), or you can
> > write your owm support for it (configure it, and read the data with an
> > RTLinux ISR). In the RTLinux ISR you can read the data and when you get
> > the PPS information start executing your code.
> >
> > I hope this help.
> >
> > > I'll thank very much some information and tips.
> > >
> > > Best Regards.
> > >
> > >
> > > Carlos Parada
> > >
> > > **********
> > > Carlos Fonseca Parada
> > > Portugal Telecom INova��o, S.A.
> > > MSI - Multim�dia e Servi�os IP - Redes MultiServi�o
> > > * Rua Eng� Jos� Ferreira Pinto Basto - 3810 Aveiro - Portugal
> > > Tel +351 234 403317 Ext: 1317
> > > Fax +351 234 420722
> > >
> > >
> > > > -----Original Message-----
> > > > From: Matt Sherer [SMTP:[EMAIL PROTECTED]]
> > > > Sent: Thursday, March 07, 2002 2:10 PM
> > > > To: '[EMAIL PROTECTED]'
> > > > Subject: RE: [rtl] smp installation
> > > >
> > > >
> > > > Yes - the kernel reflecting that source change must be actively
> > running to
> > > > make any difference.
> > > >
> > > > On Thu, 7 Mar 2002, Renfroe, Patrick B wrote:
> > > >
> > > > > Made that change and got the same error when I attempted to compile
> > > > RTLinux.
> > > > > Did I need to recompile the kernel after the change?
> > > > >
> > > > > -----Original Message-----
> > > > > From: Matt Sherer [mailto:[EMAIL PROTECTED]]
> > > > > Sent: Wednesday, March 06, 2002 8:44 AM
> > > > > To: '[EMAIL PROTECTED]'
> > > > > Subject: RE: [rtl] smp installation
> > > > >
> > > > >
> > > > >
> > > > > Can you see if you can reproduce it after raising MAX_ARG_PAGES to
> > 64 in
> > > > > include/linux/binfmts.h in the kernel source?
> > > > >
> > > > > On Wed, 6 Mar 2002, Renfroe, Patrick B wrote:
> > > > >
> > > > > > GNU xargs version 4.1.6
> > > > > > and
> > > > > > GNU bash, version 2.04.21(1)-release (i386-redhat-linux-gnu)
> > > > > >
> > > > > > Thanks
> > > > > >
> > > > > > -----Original Message-----
> > > > > > From: Matt Sherer [mailto:[EMAIL PROTECTED]]
> > > > > > Sent: Tuesday, March 05, 2002 8:27 AM
> > > > > > To: '[EMAIL PROTECTED]'
> > > > > > Subject: Re: [rtl] smp installation
> > > > > >
> > > > > >
> > > > > >
> > > > > > What version of xargs are you running, and what type/version of a
> > > > shell?
> > > > > >
> > > > > > On Tue, 5 Mar 2002, Renfroe, Patrick B wrote:
> > > > > >
> > > > > > > I am installing the 2.4.4 kernel with rtlinux 3.1 on a dual
> > > > processor
> > > > > > > (Pentium 4) machine. I finally got the 2.4.4 kernel to boot but
> > > > when I
> > > > > > > attempt to compile RTLinux I get the following error:
> > > > > > >
> > > > > > > [/usr/src/rtlinux-3.1]# make
> > > > > > > gcc -Wall -02 -o scripts/mkdep scripts/mkdep.c
> > > > > > > Kernel version 2.4.4
> > > > > > > for x in `find . -name Makefile`; do \
> > > > > > > F=`echo $x|sed 's/Makefile$//g''; \
> > > > > > > (cd $F; $RTL/scripts/mkdep *.c *.h *.S > .depend
> > > > 2>/dev/null);
> > > > > \
> > > > > > > done
> > > > > > > xargs: environment is too large for exec
> > > > > > > make: *** [.depend] Error 1
> > > > > > >
> > > > > > >
> > > > > > > What am I doing wrong.
> > > > > > >
> > > > > > > Thanks for any help.
> > > > > > > -- [rtl] ---
> > > > > > > To unsubscribe:
> > > > > > > echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR
> > > > > > > echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED]
> > > > > > > --
> > > > > > > For more information on Real-Time Linux see:
> > > > > > > http://www.rtlinux.org/
> > > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > > > --
> > > > Matt Sherer
> > > > FSMLabs, Inc.
> > > > http://www.fsmlabs.com/
> > > >
> > > > -- [rtl] ---
> > > > To unsubscribe:
> > > > echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR
> > > > echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED]
> > > > --
> > > > For more information on Real-Time Linux see:
> > > > http://www.rtlinux.org/
> > > -- [rtl] ---
> > > To unsubscribe:
> > > echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR
> > > echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED]
> > > --
> > > For more information on Real-Time Linux see:
> > > http://www.rtlinux.org/
> > >
> > >
> >
> > --
> > Jose Guilberto
> > Robotics Researcher
> > 245 Workman Bldg.
> > Dept. of Electrical Eng.
> > New Mexico Tech
> > 801 Leroy Place
> > Socorro, NM 87801
> > Phone: (505) 835-5450
> > Fax: (505) 835-5332
>
--
Jose Guilberto
Robotics Researcher
245 Workman Bldg.
Dept. of Electrical Eng.
New Mexico Tech
801 Leroy Place
Socorro, NM 87801
Phone: (505) 835-5450
Fax: (505) 835-5332
-- [rtl] ---
To unsubscribe:
echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR
echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED]
--
For more information on Real-Time Linux see:
http://www.rtlinux.org/
