Re: [ts-7000] Re: T3 and T4 timers - What are they?

[João Trindade <>]

On Fri, May 11, 2012 at 10:32 AM, Jim Jackson <> wrote:

 

On Fri, 11 May 2012, burnsmicro wrote:

>
>
> --- In ts-7000%40yahoogroups.com, "al" <> wrote:
> >
> > I do this routinely on a TS-7500 by using a high-priority thread that
> > does nothing but execute a loop that calls nanosleep() (standard Posix
> > API) and then calls a short routine. If you need tight control over
> > jitter, consider using a hardware solution. (Standard Linux is NOT a
> > real-time operating system.)
>
> Thanks. I will fall back on this if I have difficulty fighting how to
> deal with the SIGALRM resulting from the use of setitimer()

If you have difficulty doing that (it's standard Unix/Linux stuff and there
is tons of example code google-able), then you'll have problem doing kernel
code.

Despite setitimer having an interface that can set microseconds, the
smallest interval it can do is normally the jiffy interval - 10millisecs
and multiples thereof. Modern kernels do have high performance timer
options but I am not sure if they are enabled/coded in the TS kernels.

In the TS-7500 kernel there are no RT timers for sure. You are stuck with the jiffy interval (which you can raise when you compile the kernel).

 

-- 
João Trindade      <>
Telephone: +351 93 561 39 10
http://cnm.tagus.inesc-id.pt/joao+trindade

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