Have a look at this: https://hackaday.io/course/178733-raspberry-pi-pico-and-rp2040-the-deep-dive https://hackaday.io/course/178733-raspberry-pi-pico-and-rp20..

Have a look at this: https://hackaday.io/course/178733-raspberry-pi-pico-and-rp2040-the-deep-dive https://hackaday.io/course/178733-raspberry-pi-pico-and-rp20... His youtube videos are interesting as well.