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PROCESSOR-SDK-J784S4: Reg-EVM is not working

Mahendran Devendran
Prodigy 20 points
Part Number: PROCESSOR-SDK-J784S4

Tool/software:

Hi TI,

We are facing a new issue as pointed out in the below snap.
Whenever we connect the UART cable to the J48 MCU UART connector from the PC, the green LED[LD11] is not glowing and is not able to detect the MCU UARTS.So we are unable to do use or debugging for our development activities.

Could you please provide a quicker solution to solve this issue?

  • 0
    TI__Guru 52455 points

    Was the EVM previously working and now failing?  Have you tried on another computer (have seen few instances where Windows USB driver gets mess up)?  Also have you tried a different USB cable (manufacturing tolerances between connector and cable sometimes vary and a certain combination will not work.)?

  • 0 in reply to Robert Eschler
    Prodigy 20 points

    In the same PC if we connect another EVM with same USB cable to mcu UART that was working fine.
    IF we connect the defected EVM with same USB to the mcu uart the same failure occurring.
    if we connect the usb cable to main UART in the defected EVM, there it detects properly the UART.
    So suspecting the mcu uart port in the defected EVM.


    Please advice how to solve this

  • 0 in reply to Mahendran Devendran
    TI__Guru 52455 points

    Was the EVM previously working and now failing?  Please provide it usage history.

    Regarding the various test scenarios...

    1) Did you try a different USB cable with the failing MCU UART port?  I understand the USB cable you have is working - but its the connector/cable combination that sometimes fails (due to manufacturing tolerances).  That is reason I request different cable in failing port.

    2) Did you try a different PC?  I understand the PC works with other MCU and MAIN UARTs, but the Windows descriptor that can be corrupted is specific to a single USART unit (thus may only fail on the one UART port).  That is the reason I requested different PC.

    Thanks!