RE: nrf52480 dongle bricked after recover in OpenOCD

Ivo H — Mon, 02 May 2022 19:26:04 GMT

Hello,

I managed to do it!

This managed to unlock the device (make sure you have set up OpenOCD on Raspberry properly to be able to communicate via SWD):

sudo openocd -f rpi_as_debugger.cfg -c "transport select swd" -f target/nrf52.cfg -c "init;nrf52_recover"

or this:

sudo openocd -f rpi_as_debugger.cfg -c "transport select swd" -f target/nrf52.cfg -c "init; nrf52.dap apreg 1 0x0c; nrf52.dap apreg 1 0x04 0x01; reset; nrf5 mass_erase; reset; shutdown;"

Now I do not know which one is the right one, probably the first one. I guess both do quite simmilar job, but one of them was not working properly.

But still I could not see the red LED flashing.

Entering this command fixed it all:

sudo openocd -c 'bindto 0.0.0.0' -f rpi_as_debugger.cfg -c 'transport select swd' -c 'adapter speed 100' -f target/nrf52.cfg -c 'init' -c 'halt' -c 'nrf5 mass_erase' -c 'program a.hex verify' -c 'reset'

a.hex is this file (the official Nordic firmware for pca10059): /cfs-file/__key/communityserver-discussions-components-files/4/1373.pca10059_5F00_bootloader.zip

Then unplugged the dongle, plugged in and restarted OpenOCD and works like a charm back again!

Please could anyone verify this way as a correct way?

Thank you

RE: nrf52480 dongle bricked after recover in OpenOCD

Ivo H — Mon, 02 May 2022 18:12:17 GMT

Actually, the error when running openOCD is this:

Info : SWD DPIDR 0x2ba01477
Error: [nrf52.cpu] Could not find MEM-AP to control the core
****** WARNING ******
nRF52 device has AP lock engaged (see UICR APPROTECT register).
Debug access is denied.
Use 'nrf52_recover' to erase and unlock the device.

Warn : target nrf52.cpu examination failed
Info : starting gdb server for nrf52.cpu on 3333
Info : Listening on port 3333 for gdb connections

I triend to unlock the device via command:

openocd -f rpi_as_debugger.cfg -c "transport select swd" -c "adapter speed 100" -c "init nrf52.dap apreg 1 0x0C reset"

openocd -f rpi_as_debugger.cfg -c "transport select swd" -c "adapter speed 100" -c "init nrf52.dap apreg 1 0x04 0x01 reset"

but no success