我看GPIO的配置中只有 上拉和不上拉,貌似没有开漏或下拉之类的说明,
不上拉究竟是怎样一种状态,是推挽吗,还是开漏,用PWM时呢?
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我看GPIO的配置中只有 上拉和不上拉,貌似没有开漏或下拉之类的说明,
不上拉究竟是怎样一种状态,是推挽吗,还是开漏,用PWM时呢?