How to measure the speed of an Arduino function?

Question

I need to determine the speed at which the Arduino performs a specific function.

What is the best time for this? So far I have found something with a stopwatch class, but I am wondering if there is any own method for this.

Answer 1

An easy way is to use the millis() or micros() function in the Arduino library. You will get a more accurate result with micros() .

For example:

 unsigned long start = micros(); // Call to your function myFunction(); // Compute the time it took unsigned long end = micros(); unsigned long delta = end - start; Serial.println(delta); 

Read the micros() documentation carefully: there is some time resolution information.

Answer 2

The least intrusive way is to set the port pins before calling the function and the subsequent low value. Place the oscilloscope on the port pin and measure for a long time.

It can also give you a good qualitative idea of ​​runtime variability by triggering on the rising edge and observing the jitter on the falling edge.