timeslot configuration for ADC reading series

in my application i have to read the ADC (single channel) each 30us within 3 ms. And there must be no interruptions in this period of time. Then i can let radio up to 3ms before i get back to my ADC series. What is the best approach for such a case? Do i have to use timeslot API?

After reading the article i copied the code to my project and run it. The LED is blinking appr. 2 times per second. But i can't figure out how to configure the time slot for my case.

Besides, the text says i have to modufy "sys_evt_dispatch" but i can't find it in my project (based on uart example)

i am using SDK15.