I had reference the PWR_STANDBY_RTC sample code form STM32Cube_FW_L4_V1.8.0
This sample code are work well and wake up about 30 second,
but after move to my code get return fail atif(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) form SystemClock_Config()
RCC_OscInitStruct.PLL.PLLR = 2;
RCC_OscInitStruct.PLL.PLLP = 7;
RCC_OscInitStruct.PLL.PLLQ = 4;
if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
// return here.
after check, find is because PLL already used?
/* Check if the PLL is used as system clock or not */
if(__HAL_RCC_GET_SYSCLK_SOURCE() != RCC_CFGR_SWS_PLL)
I have reference this web say need turn off some content of SystemInit()
but still don't work, then how to use PLL and let SystemClock_Config?
Thx for your answer.