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用28377D的MCBSP扩展为SPI和CPLD进行通信,DSP为主机,CPLD为从机(只有一个从机),片选,CLK和发送都没有问题,通过示波器也可以看到CPLD发送给DSP的数据也没有问题,但是在CCS中在线仿真观察DRR1里面总是显示0xFF,