IO_MUX是什么意思

IO_MUX是指输入/输出多路复用器(Input/Output Multiplexer)，它是用于将外设信号传输到芯片的GPIO pad的模块。每个GPIO pad都有一组寄存器，可以配置为GPIO功能或直连功能。当配置为GPIO功能时，IO_MUX将外设信号通过GPIO交换矩阵连接到GPIO pad上，以实现高频数字特性。ESP32芯片有34个物理GPIO pad，每个pad可以用作通用IO或连接内部的外设信号。IO_MUX、RTC IO_MUX和GPIO交换矩阵共同组成了芯片的IO控制。\[1\]\[2\]\[3\]
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