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

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/16609#discussion_r666080176">cpu/rpx0xx/periph/uart.c</a>:</p>
<pre style='color:#555'>> +    }
+    io_reg_atomic_set(&dev->UARTCR.reg, enable_mask);
+    uart_init_pins(uart);
+
+    _irq_enable(uart);
+
+    return UART_OK;
+}
+
+void uart_write(uart_t uart, const uint8_t *data, size_t len)
+{
+    UART0_Type *dev = uart_config[uart].dev;
+
+    for (size_t i = 0; i < len; i++) {
+        dev->UARTDR.reg = data[i];
+        mutex_lock(&tx_locks[uart]);
</pre>
<p>Fixed</p>

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