<p></p>
<p><b>@jia200x</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/16579#discussion_r658613111">boards/nucleo-wl55jc/board.c</a>:</p>
<pre style='color:#555'>> +    gpio_init(FE_CTRL1, GPIO_OUT);
+    gpio_init(FE_CTRL2, GPIO_OUT);
+    gpio_init(FE_CTRL3, GPIO_OUT);
</pre>
<p>this should be initialized only in the "periph" version. This could be modeled in the same way as <code>sx127x</code> with an RX_SWITCH and TX_SWITCH. We can then define these pins to GPIO_UNDEF and don't do anything in such case</p>

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