当 I2C 设备空闲时会输出高阻态，而当所有设备都空闲，都输出高阻态时， 由上拉电阻把总线拉成高电平。 I2C通信时单片机GPIO口必须设置为开漏输出，否则可能会造成短路。 关于更多STM32的I2C相关信息和使用方法可以看这篇文章： https://url.zeruns.tech/JC0Ah ...

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