<p></p>
<p><b>@kfessel</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/16583#discussion_r664056999">tests/periph_gpio_no_stdio/Makefile</a>:</p>
<pre style='color:#555'>> @@ -0,0 +1,64 @@
+include ../Makefile.tests_common
+
+# Select pins suitable for testing
+# ================================
+#
+# For each input mode one pin is configured accordingly and an output pin is used to display the
+# current value read. It is suggested that the corresponding output pins are connected to LEDs, so
+# that the output level is visualized.
+#
+# For each GPIO IRQ flank one pin is configured accordingly and an output pin is toggled on each
+# IRQ triggered. Note that no debouncing is done in software, so expect some flickering on the
+# output pin if you don't connect a Schmitt trigger or so to the inputs.
+
+# Pin to use as floating input and corresponding output pin
+PIN_IN          := GPIO_PIN(0, 0)
</pre>
<p>PIN_IN          := GPIO_PIN(0, 0)</p>

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