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上电pwm管脚就输出高电平怎么配置

Question asked by Wu Mr on Jan 24, 2018
Latest reply on Jan 26, 2018 by Wu Mr

由于pwm管脚驱动蜂鸣器,但是由于电路设计为低电平导通蜂鸣器,所以要使得pwm管脚一上电就配置为高电平。

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