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IWR6843ISK: IWR6843ISK intermittently or not connecting to the RS232

Larry Koudele
Prodigy 200 points
Part Number: IWR6843ISK
Other Parts Discussed in Thread: IWR6843,

Tool/software:

RS232 will not  connect on the 6843ISK all the time.  I have several 6843ISK boards.  If I just use a USB cable to the board, and mmWave Studio, I have had cases where a board will not connect to the RS232.  When that happens, it also won't work using the DCA1000 with the 6843.  If I try enough times, suddenly it will connect.  Then it continues to work and will work with the DCA1000.  It seems like the USB ports that are identified follow the 6843 board.  I just got a new IWR6843 board.  It won't connect.  With the switches identical, my old one will, but uses different USB port numbers.  In fact, on the board that now works, it didn't work for many hours, then suddenly started working.   I just kept plugging and unplugging the USB.  Once it worked, it kept working.  I have had this happen in the past.  Very frustrating!  Ideas????

Larry

  • 0
    TI__Genius 17947 points

    Hello Larry,

    It is normal for different EVMs to show up as different COM ports. The only time the COM port will change for the same exact device, is if the Silicon Labs UART firmware is updated. I imagine you are using a 5V 3A supply? Do you get a specific error when RS232 does not connect?

    Best Regards,

    Pedrhom

  • 0 in reply to Pedrhom Nafisi
    Prodigy 200 points

    Here is the line prior to the error code, then the error code:

    [RadarAPI]: ar1.Connect(7,921600,1000)
    [12:51:23] [RadarAPI]: Error: Connection failed: Calling_ConnectTarget returned 3

    port 7 is correct, but won't connect.  

    /Larry

  • 0 in reply to Larry Koudele
    Prodigy 200 points

    Yes, the DC power is 5v 4A supply.  I measured the 5V coming in while connected.  It is good.

    Larry

  • +1 in reply to Larry Koudele
    Prodigy 200 points

    I determined the problem.  This is very concerning to me.  I have had three of these IWR6843ISK boards.  One other one would also not connect using the RS232.   Another engineer here looked around the UART IC, and found R100 was damaged and knocked off it's pads.  It appears to be an 0201 resistor.  It is a 10K.  We replaced the resistor with an 0603 10K.  Had to use some mag wire to connect it.   Now, guess what?  My brand new IWR6843ISK board has the same resistor damaged.  I think maybe an ICT test did it.  This was physical damage!  this wasted several days of my time!  Really?  I am not good at soldering 0603 parts and mag wire, but it then worked.  I would please see how this damage is occurring.  It wasn't us!