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nRF24LU1+ Programming Through USB

cyaoplus

Hi,

I have successfully flashed nRF24LU1+ via ISP. Right now, I am validating using USB to download firmware for future production.  Here is the issue.

Our project has a USB hub chip connected to two nRF24LU1+ chips.  I have flashed one of  the nRF24LU1+ with boot24lu1p-f32.hex which I found in SDK. When I connect our board to PC USB, Windows Device list recognized the unflashed  chip as USB Receiver.

In nRFgo Studio, only flashed nRF24LU1+ chip can be recognized.  Therefore, the unflahsed one cannot use USB to download. I read from spec that nRF24LU1+ has factory bootloader.  I am wondering why this issue happens. Thank you for answering.

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  • +1

    Hi,

     

    I suspect that the device "USB Receiver" has already been programmed once before.

    When delivered from Nordic, each nRF24LU1+ will have the USB bootloader present in flash and will enumerate as a bootloader device.

    The USB bootloader is made as an option for mass-production, and is considered "lost" once you have used it for programming once.

     

    It is possible to read out the USB descriptor strings in your device manager, where you can see the identifiers for the specific "USB Receiver" device.

     

    Best regards,

    Håkon

Reply
  • +1

    Hi,

     

    I suspect that the device "USB Receiver" has already been programmed once before.

    When delivered from Nordic, each nRF24LU1+ will have the USB bootloader present in flash and will enumerate as a bootloader device.

    The USB bootloader is made as an option for mass-production, and is considered "lost" once you have used it for programming once.

     

    It is possible to read out the USB descriptor strings in your device manager, where you can see the identifiers for the specific "USB Receiver" device.

     

    Best regards,

    Håkon

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