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what should I do in freertos function vApplicationIdleHook() to save power?

hi, in FreeRTOSConfig.h file, #define configUSE_TICKLESS_IDLE 1 #define configUSE_IDLE_HOOK 1

and the idlehook function void vApplicationIdleHook( void ) { __WFI; }

after implement the code above, i find it did not save power.

anybody can help me or give me a link to figure it out. thx~~