David,
With 100 us tasks I think I would use an interrupt. I believe it has less
latency and jitter than the periodic timer. If you are using an ADC card
then it will probably have the ability to generate a periodic interrupt
which is also synched to the data conversion. If so I would use this
interrupt to control that task.
The only thing that can interrupt this task is a higher priority interrupt.
Since you have control of the real time tasks and their interrupt priorities
this should be no problem.
You could use the periodic timer if you don't have an ADC card. Again, you
control what tasks have priority over others, both periodic and interrupt.
Regards,
Rich
-----Original Message-----
From: David Armstrong [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, September 26, 2001 8:35 AM
To: '[EMAIL PROTECTED]'
Subject: [rtl] interrupt timer
I want to run two tasks, one of which must run every 100us.
My worry is that the timer interrupt could stop this high priority task to
run it's own servicing routine.
When the high priority task is running under rtlinux can I be assured that
this task (which must be kicked off every 100us) will run with
out any interruptions.
If I can, what is the best way to fire off this task every 100us.
* Should I use the pthread_make_periodic_np setting the period to 100us
Or
* Is it better to generate a hardware interrupt every 100us.
Thank you for your time and help
--------------
David
Renishaw plc
Research Scotland
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