The Adafruit Metro M0 and M4 have a socket for connecting to a SWD cable built-in - you can connect (and disconnect) a SWD cable quickly. 

Remove the small plastic cap cap from the SWD socket on the Metro.

Then, connect the SWD cable from the J-Link to the Metro.

Once the Metro is wired up, plug the J-Link into a USB port on your computer and wait for the status indicator LED to turn green.


Then, plug a USB cable into the Metro, this is required!

This guide was first published on Jan 25, 2019. It was last updated on Mar 08, 2024.

This page (Metro M0/M4 Wiring) was last updated on Mar 08, 2024.

Text editor powered by tinymce.