<p><b>@ben-postman</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/11612#discussion_r290251366">tests/periph_uart_mode/main.c</a>:</p>
<pre style='color:#555'>> +#include <stdlib.h>
+
+#include "periph/uart.h"
+#include "xtimer.h"
+
+/* UART_DEV is always 0 since this test is for device with 1 UART */
+#define _UART_DEV (UART_DEV(0))
+
+
+static void _print_status(int8_t status, uart_data_bits_t data_bits,
+                          uart_parity_t parity, uart_stop_bits_t stop_bits) {
+    char mode[4];
+
+    /* If status < 0, print a header indicating an error */
+    if (status < 0) {
+        printf("Unsupported Mode: ");
</pre>
<p>Definitely, you mean if unsupported, right?</p>

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