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TMS320F28335: TMS320F28335 MCBSP communication problem

Part Number: TMS320F28335

Hi Team,

The customer encountered a problem in debugging the 28335 MCBSP communication. In self-test mode, MCBSP communication can receive data normally. However, after the self-test mode is turned off (only DLB=0), the communication between the two boards is performed, and the accepted board can accept the interrupt, but the accept register is always 0. He checked the pin connections, and it is no problem. He also uses an oscilloscope to see the transmitted pins, clocks, frame sync signals, and data, and he doesn't find the reason.

Customer would like to know how to resolve it?

Thanks.