Nordic nRF

nRF is widely used for wireless microcontroller such as nice!nano.

Softdevice

Softdevice is a binary blob that provides Bluetooth stack provided by Nordic.

The softdevice has several interrupt levels and peripherals that are proprietary and accessing them from outside the softdevice will cause a crash.

Please follow the nrf-softdevice documentation and be careful not to access resources that are proprietary to the softdevice.