title: Get time since boot in FreeRTOS
body: <p>I'm using <a href="http://www.freertos.org/" rel="noreferrer">http://www.freertos.org/</a> for an application, but I can't find how to get the system time since boot. I can create a task and keep updating a counter, but I don't think it will be a good thing since the scheduler might schedule down my task (and putting a higher priority might hang my 'real' work tasks).</p>
  
  <p>So, I want to know what might be the best solution to get how many ms elapsed since the system boot up.</p>