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stm32wb5mmg CPU2 do not go to sleep

Vandr.1
Associate II

Hello,
I have an STM32WB5MMG chip, and I work with power consumption. I have the problem that after I stop advertising (aci_gap_set_non_discoverable()), I see that a flag LL_PWR_IsActiveFlag_C2DS() is still False, and I can not switch to Switch_On_HSI(). Why does the CPU2, after stopping advertising, not go to deep sleep mode?

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