On Thu, 2007-03-29 at 18:36 +0200, Erik Mouw wrote:
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> On Thu, Mar 29, 2007 at 08:09:34PM +0530, Sandeep Sanjay Patil wrote:
> > since the interrupts are being discussed, ia had a question bugging me
> > since a long time. Sometimes we have two types of interrupts...
> >
> > 1. Level IRQ
> > 2. Edge trigerred IRQ
> >
> > difference? AFAIK, level irq's will appear when the clock is LEVEL (now
> > is it the cpu clock??) And the edge triggered irq's will appear on
> > falling or rising edge as configured in the interrupting device. My
> > question was, is it the cpu clock, or the interrupting device clock
> > being reffered here.
>
> It's the clock of whatever is sampling that particular IRQ line,
> usually the PIC or APIC.
ok.
>
> > so, if i have an edge triggered interrupt and my ISR looks like..
> >
> > irqreturn_t my_device_isr(int irqno, void *dev_id)
> > {
> > return IRQ_HANDLED;
> > }
> >
> > will this do???
>
> No, you must acknowledge the IRQ to the device, or otherwise it will
> interrupt you again.
Yeep, exactly thts what i was looking for. It should get an ack for the
interrupt. thanks for clearing this for me.
cheers,
sandeep
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