nRF5 SDK instalation in PlatformIO - Power Management

[Claudio Rosa]

Good morning,

I am developing a RAK4631 (Nordic nRF52840 + Semtech LoRa SX1262) and now I need to manage the power consumption.  My environment today is a VSCode/PlatformIO/FreeRTOS, and I need to install the nRF5 SDK in the PlatformIO to be able to work with the functions: nrf_pwr_mgmt_run() or _WFE or _WF

BSP Library : 1.6.1
Bootloader : s140 6.1.1

My code today already can read and send by LoRa a payload composed by sensors: LIS3DH, BME680, u-blox GNSS ZOE-M8Q.  My point is that I need to make the entire hardware goes to "deep sleep mode" during 15 minutes between each sensor reading cycle.

Could you help me?

Claudio

 

[Claudio Rosa]

My point is how to work with _WFI in the FreeRTOS?  I mean, what is the library that I need to have support for _WFI?

Claudio

[Einar Thorsrud]

If you use the FreeRTOS port from the nRF5 SDK, this is allready handled in the FreeRTOS idle task. You can see the implementation of this in external/freertos/portable/CMSIS/nrf52/port_cmsis_systick.c. Note that as mentionned before, this only means that the CPU will enter low power mode whenever no tasks are running. You still need to ensure that other parts of the system is not consuming power (both internally in the nRF, particularily peripherals that keep the HF clock active, as well as other parts of your product/PCB).