Interrupt Exercises

~30 min

Exercise A: GPIO Interrupts

Configure the existing GPIO input button example to use interrupts instead of polling.

• Check the esp-hal abstractions and code examples
• See if you can find examples that you can adapt
• Apply the mental model: find the Instantiate, Configure, and Control steps for interrupt-driven GPIO

Exercise B: I/O Expander Interrupt

The TCA6424 I/O expander has an INT output connected to a Xiao GPIO pin. Use it to get notified of input changes instead of polling over I2C.

• Configure a GPIO interrupt on the INT pin
• When triggered, read the I/O expander over I2C to determine what changed
• This combines GPIO interrupts with I2C communication