Let me share some information about the general configuration of IO pins when STM32 is in low power state.
1. Configure unused GPIO inputs as analog inputs
A GPIO always has one input channel, which c...
Source: Programmer Life
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STM32 uses an internal oscillator. When debugging the code that used to work, I found that it always died in the HAL_RCC_OscConfig function of the stm32f0xx_hal_rcc.c file. The following code was repe...