i2c issue

Official Hardware Classic Zero
1

I have connected to Arduino Zero boards to each other using i2c. I have put the usual i2c scanner on one of them and do not see the slave.

This source also does not seem to work:

I see a quite decent pattern on my scope however. Any hints on what could be causing this? At his point I use the standard sercom3 at both ends so I don't think I should need to change anything at sercom level?!!

2

It turned out to be that it was related to the bootloader. After replacing the bootloader by the Adafruit Feather M0 my i2c connection seems to work fine.