Is it possible to wakeup standby mode of STM32WB MCU via BLE?

Orangedream · ‎2022-09-07

We are starting a project using STM32WB MCU. We would like to minimize the power consumption while in sleep, but able to wake it up via BLE command. From the document AN5071(STM32WB ultra-low-power features overview) it says "Wakeup from this mode can also be performed by the Radio sub-system." But I didn't found any further description or example about the 'Radio sub-system'. Does the 'Radio sub-system' is same as BLE?

Is there any document or example we can study?

Remy ISSALYS · ‎2022-09-09

Hello,

On STM32WB55, according to the application note AN5289, standby mode isn't supported when RF is active:

STOP2 is the deepest low power mode supported when RF is active. When the user application has to enter Standby mode, it must first stop all RF activities, and fully re-initialize CPU2 when coming out of Standby mode. The user application may use the full non secure SRAM2a to store its own content (that needs to be retained in Standby mode).

However, on STM32WB15 standby when RF is active is fully supported, you can look BLE_HeartRate example available in STM32CubeWB package.

Best Regards

View solution in original post

Remy ISSALYS · ‎2022-09-09

Hello,

On STM32WB55, according to the application note AN5289, standby mode isn't supported when RF is active:

STOP2 is the deepest low power mode supported when RF is active. When the user application has to enter Standby mode, it must first stop all RF activities, and fully re-initialize CPU2 when coming out of Standby mode. The user application may use the full non secure SRAM2a to store its own content (that needs to be retained in Standby mode).

However, on STM32WB15 standby when RF is active is fully supported, you can look BLE_HeartRate example available in STM32CubeWB package.

Best Regards

Orangedream · ‎2022-09-11

Thank you Remy. Knowing the limit is very big for us. Save us a lot of times. Thanks~