I'm using http://www.freertos.org/ 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).
So, I want to know what might be the best solution to get how many ms elapsed since the system boot up.
I think xTaskGetTickCount() does what you want: http://www.freertos.org/a00021.html#xTaskGetTickCount