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在用SPI接口读取LTC1408AD中的数据时，为什么运行代码后用示波器测SPIx_CLK口，却测不到时钟信号，SPI口也已经配置好了，还有就是SPI口在读的AD的时候必须得有写的代码么
如果DSP做master, 需要先进行dummy write来产生clock主时钟。
dummy write是什么，应该怎么操作
dummy write是往发送寄存器里随便下个数据。
