I've already posted my problem here. But it seems a dead thread. devzone.nordicsemi.com/.../nrf51822-timer-problems
I ran into trouble when using the app_scheduler without a softdevice. The problem is the call of sd_nvic_critical_region_enter() softdevice function. When not using CRITICAL_REGION_ENTER() / _EXIT() my example code works.
How do use app_scheduler without a softdevice correctly?