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我的电路用的是MSP430F5510,设计中有用到I2C接口,SCK 和 SDA都接有4.7K的上拉电阻,用示波器抓SCK和SDA的波形,发现SCK时序正常,SDA异常,见附图(黄为SCK,紫为SDA),请问这个锯齿波形大概是什么原因造成的呢?希望有遇到该问题的小伙伴能给支个招,谢谢!