nrf52840 dongle alway boot in dfu

[nicolasp]

Tried to flash ncp .hex for pca10059 on a brand new dongle and now it is stuck in dfu (pulsing red led). The process worked on a second dongle without any issues.

Something is wrong with the dongle?

[Simonr]

It might be that the MCU is faulty, but I'd like to do some further tests first. Could you try the command nrfjprog --recover on the chip. This should reset the chip to the factory settings. You could also, while the chip is in DFU mode, select the Dongle in the nRFConnect Programmer app, and run a System report (the "hamburger" button in the top left corner) and upload the .txt. file here so I can have a look.

Best regards,

Simon

[nicolasp]

nrfjprog --recover
Recovering device. This operation might take 30s.
Erasing user code and UICR flash areas.

nrfjprog -f nrf52 --memrd 0x10001014 --n 4

0x10001014: 6603400A                              |[email protected]|

DFU doesn't boot anymore

[Simonr]

You'll have to revert it to production bootloader after this. Please see the Revert to production bootloader section in the dongle programming tutorial for instructions.

[nicolasp]

Here is the system report 

# nRFConnect System Report - 2019-09-12T15-28-26.750Z

- System: Apple Inc. MacBookPro14,3
- BIOS: Apple Inc.
- CPU: 1 x Intel® Core i7-7820HQ 2.90 GHz 8 cores (4 physical)
- Memory: 315.9 MB free of 16 GB total
- Filesystem: /dev/disk1s1 (HFS) 465.6 GB 95.2% used

- OS: Mac OS X (10.14.6) darwin x64

- Versions
- kernel: 18.7.0
- git: 2.20.1
- node: 12.0.0
- python: 2.7.10
- python3:

- Connected devices:
- /dev/tty.usbmodem0006837357031: 000683735703 PCA10056

- Current device:
- family: nRF52
- type: nRF52840
- romBaseAddr: 0x00
- romSize: 1024 KiB
- ramSize: 256 KiB
- pageSize: 4 KiB
- blAddrOffset: 0x14
- blockSize: 512
- ficrBaseAddr: 0x10000000
- ficrSize: 1024
- uicrBaseAddr: 0x10001000
- uicrSize: 1024
- mbrBaseAddr: 0x00
- mbrParamsOffset: 24
- mbrSize: 4096