    <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

<p>This function is the interrupt handler for the USB End point Zero events. </p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">CallBackRef</td><td>is the callback reference passed from the interrupt. handler, which in our case is a pointer to the driver instance. </td></tr>
    <tr><td class="paramname">EpNum</td><td>is the end point nu