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

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/12278#discussion_r326872886">cpu/efm32/periph/uart.c</a>:</p>
<pre style='color:#555'>> @@ -164,10 +163,62 @@ void uart_write(uart_t dev, const uint8_t *data, size_t len)
 void uart_poweron(uart_t dev)
 {
     CMU_ClockEnable(uart_config[dev].cmu, true);
+
+    if (_is_usart(dev)) {
+        USART_TypeDef *usart = uart_config[dev].dev;
+
+        /* enable tx */
+        usart->CMD = USART_CMD_TXEN;
</pre>
<p>Nevermind. They can of course.</p>

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