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研究IIC接口,API写的有点怪,因为我有个器件操作是没有REG ADDR的,所以还要修改API
这个多字节写的API,buffer 这个操作,感觉有问题,可能会越界,我只是看,因为板子还没回来,还没有调试
length在最初有个自减,不会溢出