Re: [ECOS] Re: DSR stops running after heavy interrupts. Spurious Interrupt!

[Andrew Lunn <andrew at lunn dot ch>]

> > What should I look for in attempting to eliminate spurious interrupts?  Can
> > they be eliminated?
> 
> The CYGNUM_HAL_INTERRUPT_NONE return from hal_IRQ_handler() only
> happens when an interrupt occurs but the interrupt controller denies
> all knowledge of it. One possibility is that hal_IRQ_handler() is
> decoding a real interrupt wrongly and generating -1 by mistake.
> 
> What you need to do is find out why hal_IRQ_handler() is returning
> this value. If you can put a breakpoint in hal_IRQ_handler()
> where CYGNUM_HAL_INTERRUPT_NONE is returned, then you should be able
> to look at all the relevant device and interrupt controller registers
> and find out what is going on.

Also check that you have level vs edge trigger correct for your
hardware.

It could be a hardware error, eg a pulse is too short, a floating
interrupt signal, some device which does not get reset when the
process does etc.

        Andrew

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