Arduino UNO/MEGA R3 Code not working.

Projects Programming
1

Greetings.

I've been using this code in my old Arduino MEGA and it works perfectly. But when I upload it to an arduino R3 UNO or MEGA, it doesn't work.
THe code can be found here: http://interface.khm.de/index.php/lab/experiments/frequency-measurement-library/
If you are going to test it, be sure to set the input pins as digital inputs.

I'd like to know why this is happening.
Thank you.

2

Define "does not work".

3

It's doing direct register manipulation, which is not inherently portable. I would guess it's not implemented in a way which is compatible with the later platforms you mention.