> The cpu is already doing 100 timer interupts/sec non stop, and running the
> process scheduler each time, and this takes very very very little time -
> if it didn't we wouldn't be running linux on the board becuase there'd be
> no time left for user apps. Printk will be writing chars over /dev/ttyAM0
> (the kernel console device) and from an interrupt routine!!! I bet system
> clock went belly up too!
>
> Though I've not tested it, I'm sure a very simple IRQ service routine just
> incrementing counters etc, which are accessible from some /proc entry or
> similar will place negligable load on the CPU and board for upto several
> hundred irqs/sec.
The trick will be getting the input pulses to generate interrupt(s).
I've not recently dug into the chip docs for the GPIO pins, but
that will be a must-have.
--
Andy Warner Voice: (612) 801-8549 Fax: (208) 575-5634
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