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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.
> 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.
Erik
- --
They're all fools. Don't worry. Darwin may be slow, but he'll
eventually get them. -- Matthew Lammers in alt.sysadmin.recovery
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