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pc-nrfutil dfu problem

Andre N

Hello,
I am trying to do a DFU over BLE using my computer, just like I do it with a phone.
If I'm not wrong, the only way to do this is by using nrfutil and a DevKit.

I am using nRF 5 SDK 17.
I tried doing a DFU with nrfutil version 6 and a nRF52840 DevKit on my custom device (based on nRF52820).

First i stumbled on a problem where the tracker wasn't found midway through the process (probably due to the fact that I change the devices MAC address)
I fixed it by changing this on dfu_transport_ble.py file

+++ b/nordicsemi/dfu/dfu_transport_ble.py
@@ -219,7 +219,7 @@ class DFUAdapter(BLEDriverObserver, BLEAdapterObserver):
         # Reconnect
-        self.target_device_name = None
+        self.target_device_name = 'DfuTarg'


But the real problem is that once the device is on DFU mode, i faced another problem:

Traceback (most recent call last):
  File "/home/user/projects/desktop/pc-nrfutil/./main.py", line 74, in <module>
    dfu.dfu_send_images()
  File "/home/user/projects/desktop/pc-nrfutil/nordicsemi/dfu/dfu.py", line 115, in dfu_send_images
    self._dfu_send_image(self.manifest.softdevice_bootloader)
  File "/home/user/projects/desktop/pc-nrfutil/nordicsemi/dfu/dfu.py", line 88, in _dfu_send_image
    self.dfu_transport.open()
  File "/home/user/projects/desktop/pc-nrfutil/nordicsemi/dfu/dfu_transport_ble.py", line 474, in open
    self.dfu_adapter.open()
  File "/home/user/projects/desktop/pc-nrfutil/nordicsemi/dfu/dfu_transport_ble.py", line 103, in open
    self.adapter.driver.open()
  File "/home/user/.local/lib/python3.10/site-packages/pc_ble_driver_py/ble_driver.py", line 106, in wrapper
    raise NordicSemiException(
pc_ble_driver_py.exceptions.NordicSemiException: Failed to open. Error code: NRF_ERROR_SD_RPC_H5_TRANSPORT_STATE



I tried using nrfutil v6, nrfutil v7 with nrf5sdk-tools, the Bluetooth Low Energy app from nrfConnect Desktop app but nothing seems to work.

I don't think the problem comes from my custom device since the DFU works when done from a mobile phone.

  • +1

    Hello,

    It appears there might be a connectivity issue between the PC and the DevKit. Please try disabling the mass storage class on the JLink as outlined here: developer.nordicsemi.com/.../nordic_segger.html. Remember to power-cycle the board after disabling it to ensure the changes take effect. 

    The documentation suggests that only Linux and macOS are affected, but I've seen cases where Windows is affected too, so it is worth a try. Alternatively, if you have a nRF52840 Dongle laying around, you can try to use that instead. It uses the native nRF USB for communication instead of the Jlink VCOM bridge.

    Best regards,

    Vidar

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