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TMS320F28388D: FSI Buffer Underrun problem

Davide Marsili
Prodigy 65 points
Part Number: TMS320F28388D

Tool/software:

I replicated fsi_ex1_loopback_cpucontrol, using external loopback. Since I am using the temporary hw I can work at a frequency of 1 Mhz maximum, using tx and rx in fiber optics 
I have 3 questions:
-What can trigger the end of frame flag error event, see figure?
-Why doesn't the interrupt related to the receive go off?
-I have sometimes appeared the buffer underrun problem, do you know how to solve it and what it refers to?

The code is the same as the one made available in the SDK.
I can provide more info if needed.

Thanks in advance

  • 0
    TI__Expert 3140 points

    Hi Davide,

    Sorry for the rate reply. I was out of office yesterday. I am reviewing your thread. I will get back to you shortly.

    Thanks,

    Susmitha

  • 0 in reply to Susmitha Bumadi
    TI__Expert 3140 points

    Hi Davide,

    If you are running same code directly from SDK, you shouldn't see any problems. To get some hands-on experience you can first run this on our launchpad/control card.

    Davide Marsili said:
    What can trigger the end of frame flag error event, see figure?

    End-of-Frame Error (EOF_ERR): This error indicates that an invalid end-of-frame bit pattern has been received. If this error occurs, the receiver must undergo a soft reset and subsequent resynchronization to resume proper operation.

    Davide Marsili said:
    I have sometimes appeared the buffer underrun problem, do you know how to solve it and what it refers to?

    FSI TX: Underrun is when FSI tries to initiate a transfer but there is no data to send.

    FSI RX: This condition occurs when software reads an empty buffer.

    I hope this solves your questions.

    Thanks,
    Susmitha