How do you measure interrupt latency?

Answer:

With the help of the oscilloscope, we can measure the interrupt latency. You need to take the following steps.

• First takes two GPIOs.
• Configure one GPIO to generate the interrupt and second for the toggling (if you want you can attach an LED).
• Monitor the PIN (using the oscilloscope or analyzer) which you have configured to generate the interrupt.
• Also, monitor (using the oscilloscope or analyzer) the second pin which is toggled at the beginning of the interrupt service routine.
• When you will generate the interrupt then the signal of both GPIOs will change.

The interval between the two signals (interrupt latency) may be easily read from the instrument.