1. When a port is to be configured as an external interrupt line, the port must be configured in input mode.
2. For bidirectional multiplexing functions, the port bit must be configured with the multiplexing function output mode (push-pull or open-drain). At this time, the input driver is configured as floating input mode.
3. When the port is configured as output mode, the pin defaults to low level.
4. To use the default multiplexing function of GPIO, you only need to set the corresponding port bit configuration register (GPIOx_CRL or GPIOx_CRH) to the corresponding value. There is no need to turn on the auxiliary function IO clock. The auxiliary function IO clock only needs to be turned on when remapping is used.
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