How to create a Low Power RTOS system code em C++ for ARM Cortex-M MCUs, a nRF52840?

Question

Good night, 
 I am developing a Firmware for a nRF52840 created by RAKWireless RAK4631, with VSCode/Platformio/C++/FreeRTOS, and now I am changing the Architecture from a Super Loop to a Event Driven. The events will be, for example, a accelerometer that it will create some Interruption when the acceleration reach a specific level. 
 Now the challenge is to reduce the power consumption with a Low Power Architecture, with resources as sleep/deep sleep and tickless, based on the "4.3.6 System Control Register" in the "Cortex-M4 Devices Generic User Guide". 
 Where could I find some example about the subject described above? 
 Cláudio Rosa

Susheel Nuguru · Accepted Answer

Claudio, Glad I could assist.

Susheel Nuguru · Answer

All FreeRTOS examples in our SDK goes to "System ON IDLE" state (WFE on ARM Cortex M4) when the RTOS schedules IDLE task to run. 
 You can ofcourse change the behavior by plugging in a callback hook using vApplicationIdleHook to make the system go to deep sleep instead of idle sleep.

How to create a Low Power RTOS system code em C++ for ARM Cortex-M MCUs, a nRF52840?

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