Hi Petteri,
I only took a quick look at KSDK_v2 for KL02 and it does not have any example for FreeRTOS. Wondering if that reason is because the KL02 has such limited flash (8/16/32KB options) and SRAM (only 1/2/4 respectively) that having FreeRTOS doesn't work on that limited of memory??? I haven't tried yet. Maybe others can chime in on this too.
Your example link is using the K64 with loads of on-chip memory (1MB flash and 256KB SRAM).
Regards,
David