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RASynBoard RAsynboard stopped working
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  • RASynBoard
Related

RAsynboard stopped working

balajivan1995
balajivan1995 over 2 years ago

Long story short, I was road-testing the RAsynboard and I wanted to create an activity tracker using the IMU sensor present in it. Due to the delicate nature of the board (two tiny jumpers wires on core board already started peeling away), I made sure I handled it with proper care. I strapped the board powered by a small 3.7v battery to my arm to collect data in SD card to create ML model. I am not sure, but I think due to sweat the board got shorted somewhere and stopped working. It blinks in red color for a few milli second and stops. I used prebuilt binaries for generating raw sensor values, nothing fancy. Now I can't even program it further (Created new project configuration in Renesas Programmer as well as suggested in guide). 

Since there is a dedicated forum for RAsynboard, I have decided to ask for help here. Any suggestions will be helpful. I am will gladly provide additional details if needed for clarification.

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  • bwilless
    bwilless over 2 years ago +1
    Sorry to hear that your board is not working. I've not seen this issue before. Does your PC recognize the Renesas Debugger hardware if your remove the J3 jumper and connect your USB-C cable to the…
  • peterfenn
    peterfenn over 2 years ago +1
    From the video plus your comments it appears that the small (1.27mm pitch) SMT 2-pin header ( J5 ) on the core board has broken-off? This damage to the PCB has likely compromised the integrity of the Boot…
  • peterfenn
    peterfenn over 2 years ago in reply to balajivan1995 +1 verified
    The last thing to possibly try here, is to reboot your PC, then re-attach the USB cable between core board and the PC... but I doubt this is an issue with your USB driver. It increasingly sounds like the…
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  • peterfenn
    0 peterfenn over 2 years ago

    From the video plus your comments it appears that the small (1.27mm pitch) SMT 2-pin header (J5) on the core board has broken-off? This damage to the PCB has likely compromised the integrity of the Boot-Selection circuit which relies on tiny R17 and R48 resistors 
    image image

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  • balajivan1995
    0 balajivan1995 over 2 years ago in reply to peterfenn

    Hi, I have soldered the J5 and connected the jumpers, took core board out of IO board. Powered the core board using external supply. Green LED indication is working, but the core board is not working. Is there anything else I can do?

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  • peterfenn
    0 peterfenn over 2 years ago in reply to balajivan1995

    With the jumper in place on J5 of Core board, do you hear/see the interface enumerate when you connect USB cable from Core board to your PC?

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  • balajivan1995
    0 balajivan1995 over 2 years ago in reply to peterfenn

    No, the COM port did not appear at all. I have tested with another laptop as well. 

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  • peterfenn
    0 peterfenn over 2 years ago in reply to balajivan1995

    Make sure the USB-C cable includes data interface (ie. not just a charging cable)
    Make sure you have installed the Renesas Flash Programmer on your development PC 

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  • peterfenn
    0 peterfenn over 2 years ago in reply to peterfenn

    At this stage I suspect that something is unresolved from the PCB jumper damage and/or the relevant MCU IOs may have sustained some damage...

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  • balajivan1995
    0 balajivan1995 over 2 years ago in reply to peterfenn

    USB cable is working fine. I can transfer data with other dev kits. Renesas Flash Programmer is installed as well. Debugger unit is showing up in device manager.

    I am not really good at hardware debugging, will glad follow any instructions provided to fix the board.

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  • peterfenn
    +1 peterfenn over 2 years ago in reply to balajivan1995

    The last thing to possibly try here, is to reboot your PC, then re-attach the USB cable between core board and the PC... but I doubt this is an issue with your USB driver. It increasingly sounds like the PCB damage has resulted in permanent damage to the MCU.
    Are you still able to reprogram and debug via the IO Board (ie. with both jumpers removed) 

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  • balajivan1995
    0 balajivan1995 over 2 years ago in reply to peterfenn

    No, I can't reprogram or debug the board using IO board either.

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  • balajivan1995
    0 balajivan1995 over 2 years ago in reply to peterfenn

    Although, I am not sure about PCB damage due to those jumpers. Because, as I have already said I was able to use it even after those pins were torn off. 

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  • balajivan1995
    0 balajivan1995 over 2 years ago in reply to peterfenn

    Although, I am not sure about PCB damage due to those jumpers. Because, as I have already said I was able to use it even after those pins were torn off. 

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