the default knob-display graphic is uiltin to the DaisyPatch class. It is used in a number of the DaisyExamples for the patch, but essentially all you need to do is add the following inside of the main while loop:
hw.DisplayControls();
If you want to see the source code for how it’s doing what it’s doing you can look within libDaisy at the daisy_patch.cpp file.