Re: RT example

[Junior <ejr@inbox.com>]

Hi All,
Does anyone have any comments on my quesions below.
I'm really looking for a good place to start and it would be a great help  if someone could suggest one.

Or, someone could guide me in the right direction with a serial driver I'm working on. I'm trying to make the serial driver interrupt
get serviced with 10-12ms when its fired. Do I use a timer or is there something in the rt patch that I can adjust in response to interrupts?

Thanks much.
--Junior

> -----Original Message-----
> From: ejr@inbox.com
> Sent: Thu, 25 Jan 2007 07:11:30 -0800
> To: r.schwebel@pengutronix.de
> Subject: Re: RT example
> 
>> On Wed, Jan 24, 2007 at 10:58:41AM -0800, Junior wrote:
>>> Does anyone have example code using the PREEMPT_RT patch?
>> 
>> You could for example start with cyclictest. It is also a good example
>> for how to write cyclic realtime programs on Linux.
> 
> Thanks, I will start there.
> 
> Where do I get the rt library? (-lrt in makefile)?
> 
> cyclictest.c: In function `timerthread':
> cyclictest.c:153: error: `SIGEV_THREAD_ID' undeclared (first use in this
> function)
> 
> Someone got this before but no solution on how to fix it.
> 
> 
>> Note that realtime is not about running fast, but running "in time".
>> That may often mean that the overall system performance goes down.
>> 
>>> PS. I'm using an ARM9 platform
>> 
>> Do you have clocksource/clockevent support for your ARM9 chip?
> 
> Aparently I don't. It's set as IS_TICK_BASED. How does this affect the
> system?
> 
> Thanks,
> --Jr.
>