9.8.2 Quick Start Guide for EXTINT - Callback

The supported board list:

  • SAM D20 Xplained Pro

  • SAM D21 Xplained Pro

  • SAM R21 Xplained Pro

  • SAM L21 Xplained Pro

  • SAM L22 Xplained Pro

  • SAM DA1 Xplained Pro

  • SAM C21 Xplained Pro

In this use case, the EXTINT module is configured for:

  • External interrupt channel connected to the board LED is used

  • External interrupt channel is configured to detect both input signal edges

  • Callbacks are used to handle detections from the External Interrupt

This use case configures a physical I/O pin of the device so that it is routed to a logical External Interrupt Controller channel to detect rising and falling edges of the incoming signal. A callback function is used to handle detection events from the External Interrupt module asynchronously.

When the board button is pressed, the board LED will light up. When the board button is released, the LED will turn off.