 unplugged during enumeration and driver install.</li>
<li>SD card should be inserted before application is started.</li>
</ul>
<h4 id="known-limitations"><b>Known limitations</b></h4>
<p>The remote wakeup feature is not yet implemented (used to bring the USB suspended bus back to the active condition).</p>
<h3 id="notes"><b>Notes</b></h3>
<h4 id="threadx-usage-hints"><b>ThreadX usage hints</b></h4>
<ul>
<li>ThreadX uses the Systick as time base, thus it is mandatory that the HAL uses a separate time base t