1. There are many I/O ports on STM32, and there are also many built-in peripherals I2C, ADC, ISP, USART. In order to save lead pins, these built-in peripherals basically share pins with I/O ports, that is, the multiplexing function of I/O pins.
2. In order to optimize the number of peripherals in 64-pin or 100-pin packages, some multiplexing functions can be remapped to other pins. Set the multiplexing remapping and debug I/O configuration register (AFIO_MAPR) to achieve pin remapping. At this time, the multiplexing functions are no longer mapped to their original allocation.
3. The AFIO clock needs to be turned on only when the AFIO event control register, AFIO remapping function and external interrupt (EXTI) control register are used.
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