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TMS320F2800137: Loopback SCI receive interrupt is not triggered while transmision interrupt still works

Part Number: TMS320F2800137


Tool/software:

I am trying SCI peripheral in F2800137 mcu.

I replicated the sci_ex2_loopback_interrupts example on my project.

But my Rx interrupt is only triggered once and then it would never been triggered again, while my Tx interrupt was working well.

I tried to config my project exactly as the example, and now I do not see any difference between them.

And I tried both internal and external connections between Tx and Rx Pin.

Here are my configs

and here is my code:

Did anyone meet this problem before? please let me know.

And I noted that when I increase the FIFO level for interrupt my received package seemed to be not in the correct order, Can anyone explain this to me?

Thanks for reading.