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两个PGA2311级联，SPI方式通信。用TI提供的硬件方式实现的话，片选CS需要32个周期的低电平。怎么设置呢，貌似只有SSIConfigSetExpClk(基址，系统时钟，SSI频率，帧长度)，谁能解答下？
http://www.pudn.com/downloads580/sourcecode/embedded/detail2379350.html
http://www.pudn.com/downloads99/sourcecode/middleware/detail405260.html
给你两个程序参考看看。没看懂楼主想要什么,需要32周期的低电平，直接给低电平即可。
