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dsp 6748 IIC通信时时钟拉高不了

TI的工程师:

      我们项目现在需要用dsp6748接多个codec(不止一种codec),都是用IIC0连接的,在调试IIC时(暂时还是单独调试)遇到IIC时钟拉低就拉不高的情况,检查IIC的配置是没有问题,硬件电路也查不出什么毛病,所以想问一下这是什么原因导致的。