初始化时，大多数MCU需要先设置IO模式，后设置GPIO电平 #1
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针对有源蜂鸣器，如果是低电平发声，IO应该初始化为高电平。如果先设置IO电平，后配置IO输出模式，导致初始化后输出低电平，蜂鸣器长鸣