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利用MCBSP向AD发送数据，DSP是5416的，寄存器配置都设置好了，利用while(!MCBSP_xrdt(mhMcbsp));
MCBSP_write16(mhMcbsp,0x2001);
此处数据只发送了一次，但是在DX处却看到的事连续的0x2001，即每来一次帧同步就发送0x2001，这是为什么呢？
在单步下，查看一下while(!MCBSP_xrdt(mhMcbsp));
执行了几次。
