Using the Oscilloscope


By moving GPIO pins, you can look at how the system
       behaves, especially when the situation is a repeated often

The overhead you add is usually very limited
One machine instruction, a few clock cycles
But sometimes GPIO operations are slow, because of clock domains

Measuring jitter, average and standard deviation is difficult
The information is neither persistent nor complete
Measuring the worst case is possible
Just trigger on a pulse "larger than XX" until it stops triggering

It is possible, though, to look at several pins per probe
You only need a resistor network
You can easily look at up to 4-5 pins per probe