David VanHorn wrote:
F_CPU is always evaluated upon each invocation, so if you ever change
it within one compilation unit, the next invocation of one of these
macros will reflect this.
That's compile-time, he's looking for execution-time changes in processor
speed.
He didn't explicitly say so, but I think he's using xdiv to scale the CPU
clock.
Sure, but he can create wrappers: fast_clk_delay(100);
slow_clock_delay(100); and so forth. If the selection must be made at
run time, that can be done with a switch() statement that knows the
current clock speed.
-dave
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