stm32IO口映射

STM32的IO口映射是指将GPIO口复用为内置外设的功能引脚。每个GPIO口都可以被配置为不同的功能，比如ADC、DAC、串口、定时器等。当一个GPIO口被配置为某个内置外设的功能引脚时，就称为复用。例如，当PA9和PA10被配置为串口1时，它们就是复用为串口功能的引脚。在配置IO口映射时，需要进行一系列的设置，包括使能GPIO端口时钟、使能复用外设时钟、配置GPIO口为复用功能，并将IO口连接到所需的复用功能。\[1\]\[2\]\[3\]
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