Sorry Peter, i refer to the code used in the tutorial that i linked before, contained in the “periph_conf.h” file.
Hi Alessandro,
sorry it's been a while and I don't really remember how we organized branches. However, looking at the tutorial one can see that the "watrli" branch is checked out which is the branch I already pointed to [1]. In there, you actually find "SAMPLE_0_V_OFFSET" and "SAMPLE_REF_V":
https://github.com/watr-li/RIOT/blob/watrli/boards/samr21-xpro/include ./periph_conf.h#L273
Best Peter