How to restore BLE functionality after waking up from low power mode on STM32WB55?

What operations need to be performed on CPU2 after CPU1 wakes up from Stop mode on STM32WB55 for BLE to work?

I have successfully implemented waking up CPU1 from low power mode, but how can CPU2's BLE functionality be restored? Here is the code:

HAL_DBGMCU_EnableDBGStopMode();
LL_RCC_SetClkAfterWakeFromStop(LL_RCC_STOP_WAKEUPCLOCK_MSI);
HAL_PWREx_HoldCore(PWR_CORE_CPU2); /* Disable C2 */

LL_C2_PWR_SetPowerMode(LL_PWR_MODE_SHUTDOWN);
HAL_SuspendTick();
HAL_PWREx_EnterSTOP2Mode(PWR_STOPENTRY_WFI);

HAL_PWREx_ReleaseCore(PWR_CORE_CPU2); /* Boot CPU2 after reset or wakeup from stop or standby modes */

HAL_ResumeTick();

I found that the clock needs to be configured and I am working on resolving it.....
I am able to scan for the device, but I cannot connect to it.

This topic has been closed for replies.

ST Technical Moderator

Hello @DaveGoing

I suggest you follow the implementation of the BLE_HeartRate example to understand how the waking up and communication between the two CPU works.

Best Regards.

STTwo-32

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