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

[DaveGoing]

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.

[STTwo-32]

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