I'm leaning towards the volatile specifier on variables, so the compiler
doesn't assume the variable is in a register in mainline code when the
interrupt routine is changing it in RAM. Also, as I recall, the interrupt
was changing a multi-byte variable that was then being evaluated by the
main line code. Perhaps part way through the evaluation in mainline code
the interrupt changes the variable. Perhaps you can disable interrupts
before the evaluation, then enable them after, or disable them, copy to a
local variable, enable interrupts, then evaluate the local.

Harold


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