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TMS320F280025C: FSI

Part Number: TMS320F280025C

两个芯片利用FSI通信,第一个芯片得TX接到第二个芯片得RX,同样第二个芯片得TX接到第一个芯片得RX,但是总是第一个芯片收发正常,第二个芯片只能发,接收不到,请问什么原因?