In Atmel Studio there are some examples in ‘ASF Example projects’. I found a FreeRTOS example called ‘FreeRTOS Basic Example’ for SAM3X-EK. I am using the Arduino Due with the same microprocessor and was wondering what things I have to modify to make it work with the Arduino Due. I was wondering also if there will come an example with interrupt using FreeRTOS with the Arduino Due.

If you have the latest ASF version then open up the ASF wizard, select to show projects by board and select the Due board, then look for a “FreeRTOS Peripheral Control” example in the list of projects.  I think that will have what you want. Regards.