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您好,
拨码开关是上电前设置好的吗?
同一条I2C总线上的SDA SCL共用一个上拉电阻皆可,每个都有上拉电阻,相当于电阻并联。
SDA寻址无法通讯,是否存在时序问题,SDA数据线上的电压波形是否正常。