<p><b>@fjmolinas</b> requested changes on this pull request.</p>

<p>I know see what I probably did wrong on my first go, I had the rx pin miss placed. All the tests are passing now except for <code>tests/periph_rtt</code>.</p>
<p>About <code>rtt</code> I don't know what to do in this case, even applying my branch code, the test wont pass because LSI isn't precise enough. I think in this case we might exclude the test from the CI because the frequency has to be measured externally.</p>
<p>I would still add the feature but document that when using LSI manual calibration must be done. What do you think?</p>

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