n> <span class="ident">nb</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">u8</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
        <span class="comment">// read the status register</span>
        <span class="kw">let</span> <span class="ident">isr</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">usart</span>.<span class="ident">isr</span>.<span class="ident">read</span>();

        <span class="kw">if</