The subject says it all. I've an ISR that is using too many cycles for
something that kicks every 10us. I'm very experienced with the PIC and
know how to specify registers that are not touched outside of the ISR to
avoid lots of "push-n-pop" actions. Is there something like that in the
AVR toolchain or am I going to have to resort to assembly to get this
thing leaned down? I'd like to create some memory that is dedicated to
the ISR such that the compiler knows that it doesn't need to be saved.
Also a way to get scratchpad memory assigned to it for some basic math
that I don't want to have to use the overhead of push/pop. Can anyone
offer insight into how I can lean an ISR down or what sorts of
operations or memory types to avoid there with avr-gcc?
many thanks,
DLC
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Dennis Clark TTT Enterprises
www.techtoystoday.com
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