nRF52840 - Not detected on Win10 PC - anymore

[simonnrf52]

Hi,

I have nRF52840 dev board which was detected and LEDs were coming on. I tried programming the prebuilt throughput hex file in nRFgo Studio.

C:\Projects\NORDIC\nRF5_SDK_14.0.0_3bcc1f7\examples\ble_central_and_peripheral\experimental\ble_app_att_mtu_throughput\hex\ble_app_att_mtu_throughput_pca10056_s140.hex

Now, no LEDs come on, it isn't detected as a drive on the PC and I can't find/erase it using nRFgo Studio of the command line tool.

I have a second board which does light up (factory default program) which I haven't reprogrammed. I need two for the throughput demo.

(1) Have I "bricked" one of the boards? (2) Is there a way of recovering it?

The power source switch is on VDD The other switch is on Default

[Sigurd]

Hi,

Try the steps desrcibed in this post to recover the board.

[simonnrf52]

This worked " 4.Have you tried to press the IF BOOT/RESET button while power cycling the kit? It should then show up as a Removable Storage Device named "BOOTLOADER". Then you can drag-and-drop this file onto the storage device to reprogram the JLINK firmware. "

I can now see the device. But ... I get errors when trying to use nRFgo or command line. Here's the output from log.log

---

nrfjprog -e --log

nrfjprog verion 9.7.0

---

FUNCTION: open_dll.

FUNCTION: open_dll.

FUNCTION: enum_emu_snr.

FUNCTION: enum_emu_snr.

FUNCTION: enum_emu_snr.

FUNCTION: enum_emu_snr.

FUNCTION: connect_to_emu_with_snr.

FUNCTION: connect_to_emu_with_snr.

FUNCTION: connect_to_emu_without_snr.

FUNCTION: enum_emu_snr.

Device "NRF52832_XXAA" selected.

FUNCTION: read_connected_emu_snr.

FUNCTION: read_connected_emu_snr.

FUNCTION: read_device_family.

FUNCTION: read_device_family.

JLinkARM.dll CORESIGHT_WriteAPDPReg returned error -1.

JLinkARM.dll CORESIGHT_WriteAPDPReg returned error -102.

FUNCTION: close_dll.

FUNCTION: close_dll.