Can the clock be redefined in the Arduino IDE?

[charlespax]

If we clock the processor at 12 MHz, it would be good if we can redefine the clock frequency through the Arduino IDE, so all the timers are correct.

[kehribar]

Yes, you can do that by creating a custom board by modifying the boards.txt file.

[charlespax]

But is there a way to change it from within an Arduino sketch

In boards.txt the clock is defined by the line ".build.f_cpu=".

Then platform.txt that value is passed to the compiler by the argument "-DF_CPU={build.f_cpu}".

In the Arduino sketch can we redefine that value with a line like this?

define build.f_cpu=12000000L

I'll do a quick test. It shouldn't matter if we're using the ATtiny and not using the Arduino IDE, but I'm still curious.

[charlespax]

Unfortunately, no, it cannot.