I used the circuit found from pg. 12 of the ST lm317 datasheet [1] for setting the output voltage. It would be nice to be able to set the output current as well. Ideal would be a continuosly adjustable current limit, but I think a digitally selectable limiter with a couple of settings (e.g. 20/100/250/.. mA) would be okay too. Any idea how to add that feature?

[1] https://www.st.com/resource/en/datasheet/lm217.pdf