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28004xGPIO问题

开发板的GPIO32引脚一直是高电平,拉不下来,是不是坏了?之前用作can通讯还好好的,不知怎么can就不通,直接bus-off,一测量发现gpio32对地只有90欧。

我的问题是:GPIO什么情况下会坏?