ass="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;<span class="comment">/** @ingroup util</span></div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;<span class="comment">Set pin 13 low for testing timing with an oscilloscope.*/</span></div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;<span class="keyword">inline</span></div><div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="keywordty