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RTOS/AM5728: EDMA event complete interrupt

Part Number: AM5728

Tool/software: TI-RTOS

When I configure MCASP with EDMA , I use Ping-Pong Buffering continually  to change data .  I can continually  get  data, but  I cannot  response every completion event interruption .

Why did it happen?

Can you give me some ideals about interruption responsion?