TMS320F280039C: FSI Communication Error Occur When Two Devices Communicate With Each Other With External Wiring

Logic Starry

Part Number: TMS320F280039C
Other Parts Discussed in Thread: C2000WARE

Tool/software:

I recently used FSI communication for high-speed communication between two devices(without FSI interrupts enabled).I used the SysCfg tool to configure the FSI module. The specific configuration is shown in the following figure.

Both devices have enabled FSI sending and receiving functions to achieve full duplex.Within the 1ms timer interrupt set, two devices send data frames containing 16 pieces of data to each other. In the while(1) loop, both devices repeatedly call the receive function for data processing.
However, after observation, the receiving devices often experience receiving errors.The following are code snippets for Transmitting and receiving processing and the status of the FSI_RX Resigster.

void ComFSI_TxLoop()	// In the 1ms Timer Interrupt
{
    FSI_setTxSoftwareFrameSize(dFSI_TxBase, 16);
    FSI_setTxFrameTag(dFSI_TxBase, FSI_FRAME_TAG0);
    FSI_setTxFrameType(dFSI_TxBase, FSI_FRAME_TYPE_NWORD_DATA);

    ComFSI.TxEventStatus = FSI_getTxEventStatus(dFSI_TxBase);
    if(ComFSI.TxEventStatus & (FSI_TX_EVT_BUF_UNDERRUN | FSI_TX_EVT_BUF_OVERRUN))
    {
        FSI_resetTxModule (dFSI_TxBase, FSI_TX_MAIN_CORE_RESET);
    }
    FSI_clearTxEvents(dFSI_RxBase,ComFSI.TxEventStatus);
    ComFSI.TxEventStatus = 0;

    FSI_setTxUserDefinedData(dFSI_TxBase, ComFSI.TxUserData.all);

    FSI_writeTxBuffer(dFSI_TxBase, ComFSI.TxData.Array, dFSI_TxWords, 0U);

    FSI_startTxTransmit(dFSI_TxBase);    // Start Transfer

}

void ComFSI_RxLoop()	// In the While(1) Loop
{
    ComFSI.RxEventStatus = FSI_getRxEventStatus(dFSI_RxBase);

    if( ComFSI.RxEventStatus & (FSI_RX_EVT_FRAME_DONE | FSI_RX_EVT_DATA_FRAME) )
    {
        ComFSI.RecvDataFrameFlg = 1;
        ComFSI.RxUserData.all = FSI_getRxUserDefinedData(dFSI_RxBase);
        FSI_readRxBuffer(dFSI_RxBase, ComFSI.RxData.Array, dFSI_RxWords, 0);
    }
    else if( ComFSI.RxEventStatus & (FSI_RX_EVT_CRC_ERR | FSI_RX_EVT_TYPE_ERR | FSI_RX_EVT_EOF_ERR | FSI_RX_EVT_ERR_FRAME
            | FSI_RX_EVT_OVERRUN | FSI_RX_EVT_UNDERRUN | FSI_RX_EVT_FRAME_OVERRUN) )
    {
        RxErrCnt ++;
        FSIRX_init();
        ComFSI_Init();
        FSI_executeTxFlushSequence(dFSI_TxBase, dFSI_TxCLK_Prescalar);
    }

    FSI_clearRxEvents(dFSI_RxBase,ComFSI.RxEventStatus);
    ComFSI.RxEventStatus = 0;
}

It is worth mentioning that this type of receiving error does not occur for a period of time after starting communication,but it will be triggered after a period of communication and needs to be restored by resetting the FSI module.

In addition, when I used two other devices (F280025) with the same configuration and code for FSI communication, this phenomenon did not occur.When I used one F280025 and one F280039, the latter still had reception issues.So I guess the problem lies with F280039C, but I'm not sure what the specific problem is although I have consulted relevant information about FSI
I hope anyone can help.

over 2 years ago

0 Logic Starry over 2 years ago

Prodigy 10 points

The external wiring is shown below

0 Susmitha Bumadi over 2 years ago in reply to Logic Starry

TI__Expert 3350 points

Hi Logic,

Is this custom code? I would recommend you try out some of the FSI examples in C2000ware and see if you get any errors.

Thanks,

Susmitha

0 Susmitha Bumadi over 2 years ago in reply to Susmitha Bumadi

TI__Expert 3350 points

Please also refer to this section "32.4.1 Establishing the Communication Link" for having synchronization between 2 controllers in below link.

TMS320F28003x Real-Time Microcontrollers Technical Reference Manual (Rev. C)

0 Logic Starry over 2 years ago in reply to Susmitha Bumadi

Prodigy 10 points

Hi Susmitha,

Thank you for your answer. I tried two examples in C2000Ware, which called fsi_ex8_p2pconnection_rx and fsi_ex8_p2pconnection_tx, and they work well without packet loss.

Then I checked my project and found that when I checked the register for Overrun or Underrun bit, the Tx module was reset by me. When I stopped checking the status of these two bits during FSI communication, it seemed to working well. So I think may be this is the reason for the previous problem.

if(ComFSI.TxEventStatus & (FSI_TX_EVT_BUF_UNDERRUN | FSI_TX_EVT_BUF_OVERRUN))
{
    FSI_resetTxModule (dFSI_TxBase, FSI_TX_MAIN_CORE_RESET);
}

In TMS320F28003x Real-Time Microcontrollers Technical Reference Manual (Rev. C) I found the definition of these two bits, which seemed to indicate that I was writing or reading the register too quickly. But as I said before, my send function is called within a 1ms interrupt, so theoretically this should not happen.

In my project, why does the FSI module still work properly even when these two bits are set?

Thanks,

Logic

+1 Susmitha Bumadi over 2 years ago in reply to Logic Starry

TI__Expert 3350 points

Hi Logic,

It's good to hear that you figured out the issue, why it is happening.

Usually, we recommend using FSI interrupt to do write from buffers. All of C2000ware examples for FSI have FSI interrupt.

The use of timer interrupt might be causing the issue. Please refer to section in 31.3.2.4 which talks about overrun and underrun errors.

TMS320F28003x Real-Time Microcontrollers Technical Reference Manual (Rev. C)

Thanks,

Susmitha

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TMS320F280039C: FSI Communication Error Occur When Two Devices Communicate With Each Other With External Wiring