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

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/16506#discussion_r676516414">cpu/sam0_common/periph/uart.c</a>:</p>
<pre style='color:#555'>> @@ -396,6 +423,17 @@ static inline void irq_handler(unsigned uartnum)
     }
 #endif
 
+#ifdef MODULE_PERIPH_UART_RX_START
+    if (status & SERCOM_USART_INTFLAG_RXS && dev(uartnum)->INTENSET.bit.RXS) {
+        /* clear receive start flag */
+        dev(uartnum)->INTFLAG.reg = SERCOM_USART_INTFLAG_RXS;
</pre>
<p>Collision detection is a separate feature of the UART unrelated to this PR (<code>COLDEN</code> / <code>STATUS.COLL</code>)</p>

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