It is possible to use the FreeRTOS tick count as the trace recorder time source, and the
trace recorder C code is delivered with this generic configuration. However, using
the tick count will result in a very low time resolution, so it is highly recommended
to adapt the trace recorder to a particular hardware platform by instead sourcing time values
from a high resolution hardware timer.
A template file called trcPort.c is provided for this purpose. The file
contains a function that should be implemented to return the current time, which
can be the value of the hardware counter used to supply the FreeRTOS tick. Please
refer to the comments in the file for detailed instructions. The FreeRTOS+Trace recorder
code also also
needs to know the frequency at which the timer is running.
[The hardware timer used to supply the FreeRTOS tick is usually configured
by a function called prvSetupTimerInterrupt() in the FreeRTOS port.c file used
by your FreeRTOS application.]
Existing ports are listed on the Percepio web site.