Re: [ECOS] timer -> interrupt

[Andrew Lunn <andrew at lunn dot ch>]

On Fri, Oct 22, 2004 at 05:07:32PM +0200, Sicheri Marco wrote:
> I All,
> I need to create a timer that cause an interrupt.
> Oh yes, the cyg_alarm_xxx work fine! But the resolution (tick) isn't
> sufficient... :o(
> My timer must count and each 100us (time between 100us and 800us) cause a
> interrupt, so that my interrupt routine can work.
> How can i do it?
> Normaly I programming the CPU registers with time and interupt vector. But
> in eCos: How do i do?

Reading the manual is normally a good start.

http://ecos.sourceware.org/docs-latest/

You need to add an interrupt handling function using the
cyg_interrupt_*() functions. Then program one of the spare hardware
timer to generate interrupts at the rate you need. You have a few
choices how you handle the interrupt after that.

You could instantiate a new counter object. Your DSR routine then
calls the counters tick function. You can then use this new counter
object with the normal cyg_alarm_*() functions to give high accuracy
alarms.

You your DSR function could do all you need.

        Andrew

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