JLINKARM_DLL_ERROR (ffffff9a) on nrf9160

[Nikunj]

Hello Nordic community,

I updated latest modem firmware v1.1.0 in nRF9160 custom board. After flashing application code into custom hardware I power off and power on board after that I do try to detect board using nRF connect. It shows an following error,

2020-01-18T12:12:29.435Z INFO Application data folder: C:\Users\Admin\AppData\Roaming\nrfconnect\pc-nrfconnect-programmer
2020-01-18T12:12:29.538Z DEBUG App pc-nrfconnect-programmer v1.3.1 official
2020-01-18T12:12:29.538Z DEBUG App path: C:\Users\Admin\.nrfconnect-apps\node_modules\pc-nrfconnect-programmer
2020-01-18T12:12:29.538Z DEBUG nRFConnect 3.3.0 is supported by the app (^3.3.0)
2020-01-18T12:12:29.538Z DEBUG nRFConnect path: C:\Users\Admin\AppData\Local\Programs\nrfconnect\resources\app.asar
2020-01-18T12:12:29.538Z DEBUG HomeDir: C:\Users\Admin
2020-01-18T12:12:29.538Z DEBUG TmpDir: C:\Users\Admin\AppData\Local\Temp
2020-01-18T12:12:29.567Z INFO Using nrfjprog library 10.5.0, pc-nrfjprog-js 1.6.0
2020-01-18T12:12:29.569Z VERBOSE Could not fetch serial number for serial port at COM1
2020-01-18T12:12:34.327Z INFO Using nrfjprog to communicate with target
2020-01-18T12:12:34.882Z INFO Using J-Link Software version 6.60
2020-01-18T12:12:36.127Z INFO Segger serial:  960020024
2020-01-18T12:12:36.127Z INFO Segger speed:  2000  kHz
2020-01-18T12:12:36.127Z INFO Segger version:  J-Link OB-K22-NordicSemi compiled Dec 11 2019 10:02:01
2020-01-18T12:12:36.134Z INFO Core probed: 960020024.
2020-01-18T12:12:36.134Z INFO Core RAM: 256KiB.
2020-01-18T12:12:36.134Z INFO Core ROM: 1024KiB in pages of 4KiB.
2020-01-18T12:12:36.288Z ERROR Error when closing nrfjprog: Error: Error occured when close opened device. Errorcode: CouldNotResetDevice (0x5)
Lowlevel error: JLINKARM_DLL_ERROR (ffffff9a)

2020-01-18T12:12:36.289Z INFO Model: NRF9160_xxAA_FUTURE.
2020-01-18T12:12:36.308Z ERROR Error when getting device info: Error: Error: Error occured when open device long term. Errorcode: CouldNotOpenDevice (0x4)
Lowlevel error: INVALID_OPERATION (fffffffe)

2020-01-18T12:12:36.309Z DEBUG getDeviceMemMap: r is not iterable
2020-01-18T12:12:36.319Z ERROR Error when closing nrfjprog: Error: Error occured when close opened device. Errorcode: CouldNotOpenDevice (0x4)
Lowlevel error: INVALID_OPERATION (fffffffe)

Application code in hardware is working but now I do want to change application code.

Thanks and Regards,

Nikunj Panchani

[Håkon Alseth]

Hi,

 

Does the UART output from the nRF91 show anything?

Have you tried recovering the device using nrfjprog directly? This can be done by issuing "nrfjprog -e -f nrf91" from command line.

 

Kind regards,

Håkon

[Nikunj]

Hello, 

Thanks for your reply.

After some debugging of hardware I found that my custom hardware is detected when SW11 switched to 1.8V. when I switch it to 3.3V it will it will again not detected.

Can you tell me what situation occurs here?

Thanks,

Nikunj

[Håkon Alseth]

The DK does not have a level shifter so you need to match the voltages.

The voltage must match on the debug side and nRF side, if not; they cannot successfully communicate as >=0.7*VDD is required to read a valid '1'.