nRF52840 connection to load MCUBoot+Zephyr

[Claudio Rosa]

I am having problems in the JLink connection for nRF52840(RAK4631) to load MCUBoot+Zephyr application.  In the RAK4631 RAKWireless bootloader, it is loaded using nrfutil by usb serial connection, for example "nrfutil.exe dfu serial -pkg rak4631_factory_bootloader.zip -p COM5", then I don´t have to have a JLink for every flash operation.

I have a nRF52840DK what there we have a JLink-OB, but for production environment it will be expensive for thousands devices, each one with his own JLink-OB.  Is it possible to load a merged.hex without by USB instead of JLink?

Regards,

Claudio

[Claudio Rosa]

The entire environment is:

1. RAK4631: a Zephyr supported solution with a Nordic nRF52840 + Semtech LoRa Radio SX1262.
2. RAK19007 : a mother board for:
   1. RAK4631
   2. RAK1904: LIS3DH accelerometer
   3. RAK1906: a Bosh BME680 environmento sensors
   4. RAK5801: a 4-20mA sensor + a pressure transducer
   5. RAK12500: GNSS ublox ZOE-M8
   6. RAK15007: Infiniion SPI FRAM 1MByte
   7. RAK15002: SD card reader

The solution will be applied in a wagon in a train in the Railroad Company in Brazil, with 19000 wagons.

Claudio 

[Einar Thorsrud]

Hi,

As you have a debugger you can erase everyting on the module so you do not need to think about what wast there before. But is the problem here that you are unanablet to debug? If you can back-track a bit and explain from a high level what you want to achieve that would be good.

That said, assumign the problem is that you are not ble to program via the J-Link, I suggest you start with a recover operation. Make sure you have the latest nRF Command Line tools, and use "nrfjprog --recover". This will open the debug port in case it was locked down by AP protect before. It will also erase the flash content during that operation. Does that work? And are you able pto program the device with what you want after that?

[Claudio Rosa]

thank you by ypur sppoert.

Cludio

[ruswerner]

Hi Claudio, Did you ever get the RAK12500 working with Zephyr? if so, can you please share? thanks

[Claudio Rosa]

Not yet :-)

I had a meeting with the Brazilian U-Blox Distributor and he told me that it is installed in the Zephyr as a module.  But I didn´t undertstoo how a "module" works in Zephyr.

I will give new as soon as possible.

claudio