[ts-7000] Re: high resolution timers and real time

["komal" <>]

I am new to Linux programming but I do have considerable experience with 
microcontrollers. If you can guide me to the process, or perhaps provide me a 
suitable example I am sure I will be able to implement the solution, with your 
help.

Waiting for your reply,
Komal RAUF

--- In  Walter Marvin <> wrote:
>
> This is for technoligic or someone like myself to do... not for beginner
>
>
>
> ________________________________
>  From: komal <>
> To: 
> Sent: Thursday, April 5, 2012 12:20 AM
> Subject: [ts-7000] Re: high resolution timers and real time
> 
>
> Â 
>
> thank you for your reply. I would really appreciate it if you can elaborate 
> on the solution you have mentioned. I am a Linux newbie so not very familiar 
> with the development process.
> Thank you :)
>
> --- In  Walter Marvin <walter.marvin@> wrote:
> >
> > If you don't need the serial uarts you can steal this interrupt to support 
> > hi res timers. Its a relitively simple kernel mod.
> >
> > thanks
> >
> > Walter
> >
> >
> >
> > ________________________________
> >  From: Jo�£o Trindade <trindade.joao@>
> > To: 
> > Sent: Monday, April 2, 2012 11:22 AM
> > Subject: Re: [ts-7000] Re: high resolution timers and real time
> >
> >
> > � 
> > I don't think that patch will work on the ts-7500.
> >
> >
> > On Mon, Apr 2, 2012 at 8:39 AM, komal <komalrauf@> wrote:
> >
> >
> > >� 
> > >Dear Sir,
> > >
> > >I have recently acquired a ts-7500 board with the development kit. The SD 
> > >card comes with a 2.6.24 Linux Kernel. After a few days of experimenting I 
> > >have realized that my application (controlling a servo through PWM) will 
> > >require HRT and RT support which the Kernel is unable to provide (maximum 
> > >timer resolution I am getting on the current Kernel is 20ms).
> > >
> > >I am new to Linux and embedded systems development and hence I am a little 
> > >confused about how to tackle this problem. I do not understand what you 
> > >mean by applying the patches and how to apply the patch. Can i simply do 
> > >it on-board my board with the SD-Card. I have a windows PC with Eclipse 
> > >for Development.
> > >
> > >Any help you can provide me will be highly appreciated. Thank you.
> > >
> > >Regards,
> > >Komal RAUF
> > >
> > >--- In  Peter Gammie <peteg42@> wrote:
> > >>
> > >> Charles, any anyone interested in hrtimers:
> > >>
> > >> With Andrew's help I managed to build a 2.6.32.3 kernel that seems to 
> > >> work. Attached are a config and a patch, based on this:
> > >>
> > >> http://lkml.org/lkml/2009/7/22/119
> > >>
> > >> that enable hrtimers. I've lightly tested it on a ts7260 with 64Mb of 
> > >> memory. I loaded the kernel via TFTP with:
> > >>
> > >> load -r -b 0x00218000 -h 192.168.1.1 z
> > >> exec -c "console=ttyAM0,115200 
> > >> ip=192.168.1.50:192.168.1.1:192.168.1.1:255.255.255.0:ts7200a:eth0:off  
> > >> root=/dev/mtdblock1"
> > >>
> > >> (i.e. no special memory options or anything.)
> > >>
> > >> So the routine is to apply Matthieu's patches, then this one. I expect 
> > >> it will apply to other kernel versions (specifically 2.6.29.6 if you 
> > >> want -RT) without too much bother - but be careful that the Kconfig 
> > >> patch applies to the right system type!
> > >>
> > >> As for the clock multiplexing, Charles's suggestion of using just a 
> > >> PREEMPT (not RT) kernel results in better behaviour under light periodic 
> > >> load (it doesn't flicker while running top on the console) but about the 
> > >> same under heavier load (scp'ing a few megabytes via ethernet). I have 
> > >> the CONFIG_NO_HZ (tickless) option set, which may or may not do anything 
> > >> in particular...
> > >>
> > >> So, more investigation is required.
> > >>
> > >> Thanks for all your help.
> > >>
> > >> cheers
> > >> peter
> > >>
> > >>
> > >>
> > >>
> > >> --
> > >> http://peteg.org/
> > >>
> > >
> > >
> >
> >
> > --
> > Jo�£o Trindade�  �  �  <trindade.joao@>
> > Telephone: +351 93 561 39 10
> > http://cnm.tagus.inesc-id.pt/joao+trindade
> >
>




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