ADC power management
Overview
This sample is a minimum application to demonstrate basic power management behavior in a basic ADC set up in low power context.
Requirements
The board should support enabling PM. For a STM32 based target, it means that
it should support a clock source alternative to Cortex Systick that can be used
in core sleep states, as LPTIM (st,stm32-lptim).
Building and Running
Build and flash as follows, changing nucleo_wb55rg for your board:
west build -b nucleo_wb55rg samples/boards/st/power_mgmt/adc
west flash
After flashing, the console shows the ADC measurement in the form:
ADC reading[0]:
- adc@50040000, channel 3: 1158 = 932 mV
PM configurations
By default, CONFIG_PM_DEVICE and CONFIG_PM_DEVICE_RUNTIME are
enabled.
On STM32WB, we can observe a power consumption of about 25µA with both kconfig
enabled, 27.5µA without (each time with CONFIG_PM enabled).