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C6748 I2C



最近做了一个C6748与aic3104的采集驱动,在向aic3104寄存器写值时不成功,使用的是I2C1接口(输入时钟为主频四分频),2.2K电阻上拉,100k通信速率,从机地址0x18,;用示波器观察,SCL10us一个周期,说明100k通信速率正确,程序开始后,能看到起始位和0011000的地址以及r/w(为0,说明是发),然后SDA一直为高,说明没有收到ACK,请问是什么原因?