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5509A有用IIC接口写SCCB的么？我用CSL的API函数可以读到从设备SCCB寄存器的初始值 但是写操作之后没效果 依然读到的只是初始值 。需要什么特殊操作 或者怎么解决呢？非得要软件模拟么？
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