Nrf52840 dongle cannot enter reset mode

RE: Nrf52840 dongle cannot enter reset mode

senthil_kumar — Tue, 25 May 2021 12:37:16 GMT

Hi Amanda,

Sorry for that, I thought this case was not completed, that's why I replied to this case.

[quote userid="77782" url="~/f/nordic-q-a/58014/nrf52840-dongle-cannot-enter-reset-mode/311371#311371"]Please create your own case[/quote]

Yeah sure.

Thanks.

RE: Nrf52840 dongle cannot enter reset mode

Amanda Hsieh — Tue, 25 May 2021 09:12:34 GMT

Hi Senthil,

Please create your own case. This case was updated one year ago, and it seems related to this case https://devzone.nordicsemi.com/f/nordic-q-a/75142/nrf52840-dongle-usb-dfu-problem.

-Amanda H.

RE: Nrf52840 dongle cannot enter reset mode

senthil_kumar — Sun, 23 May 2021 05:26:19 GMT

Thanks for your response.

I already tried three types of HEX files but no response. But before I set the UICR register value for REGOUT0 setting 3.3v.

devzone.nordicsemi.com/.../1234.pca10059_5F00_bootloader_5F00_mbr_5F00_v1.0.1.hex

devzone.nordicsemi.com/.../4331.graviton_5F00_bootloader_5F00_mbr_5F00_v1.0.1_2D005B00_nRF5_5F00_SDK_5F00_15.0.1_2D00_1.alpha_5F00_f76d012_5D00_.hex

devzone.nordicsemi.com/.../1727.nrf52840_5F00_xxaa.hex

After bootload, nrf52840_Dongle LD2 red led rapidly blinking toggling every 100 ms, Whenever the debugger is not connected, That time comport also not showing in nRF connect.

If a debugger is connected to a dongle the LD2 red led is soft blinking (Breathing).

devzone.nordicsemi.com/.../0486.WhatsApp-Video-2021_2D00_05_2D00_22-at-9.41.20-AM.mp4

Thanks & Regards

Senthil Kumar

RE: Nrf52840 dongle cannot enter reset mode

Nguyen Hoan Hoang — Sun, 23 May 2021 03:45:52 GMT

try this one instead sourceforge.net/.../

RE: Nrf52840 dongle cannot enter reset mode

senthil_kumar — Sat, 22 May 2021 05:59:05 GMT

[quote userid="77782" url="~/f/nordic-q-a/58014/nrf52840-dongle-cannot-enter-reset-mode/235700#235700"]Have you soldered and connected an external debugger, and erased all flash(including bootloader)?[/quote]

Yes, here I am erased all the flash (including bootloader).

And I tried this link /cfs-file/__key/communityserver-discussions-components-files/4/1643.pca10059_5F00_bootloader.zip

But nothing happened after flashing the bootloader, so what can I have to do to recover the bootloader?

RE: Nrf52840 dongle cannot enter reset mode

Amanda Hsieh — Fri, 21 Feb 2020 12:13:53 GMT

Hi,

Have you soldered and connected an external debugger, and erased all flash(including bootloader)?

Could you try other USB ports on the PC or other PC?

-Amanda H.

RE: Nrf52840 dongle cannot enter reset mode

Geass77 — Fri, 21 Feb 2020 09:47:07 GMT

not flashing, nrfconnect doesn't have any response

RE: Nrf52840 dongle cannot enter reset mode

Amanda Hsieh — Thu, 20 Feb 2020 14:31:23 GMT

Hi,

Do you see LED2 flash with the red light after pressing the reset button?

[quote user="Geass77"]When I press reset button, my dongle doesn't have any response, my programmer cannot detect it too[/quote]

Do you use the nRF Connect for Desktop/Programmer app?

-Amanda H.

RE: Nrf52840 dongle cannot enter reset mode

Geass77 — Thu, 20 Feb 2020 11:48:48 GMT

yes,small one

RE: Nrf52840 dongle cannot enter reset mode

Amanda Hsieh — Thu, 20 Feb 2020 07:43:04 GMT

Did you really press the reset button which is the sideways button right next to the more obvious SW1 button on the Dongle?

-Amanda H.

RE: Nrf52840 dongle cannot enter reset mode

Geass77 — Thu, 20 Feb 2020 03:29:52 GMT

When I press reset button, my dongle doesn't have any response, my programmer cannot detect it too

RE: Nrf52840 dongle cannot enter reset mode

Amanda Hsieh — Wed, 19 Feb 2020 13:49:29 GMT

Hi,

The simplest way to program the dongle is to use the nRF Connect for Desktop and launch the Programmer app:

Open nRF Connect for Desktop and launch the Programmer app.
Press the reset button to put the Dongle in DFU mode. This is not needed if the currently running application uses the DFU trigger library. Note that the reset button is the sideways button right next to the more obvious SW1 button on the Dongle:
Select the dongle in the dropdown in the upper left corner if it is shown.
Click "Add HEX file" to select the application hex file to program onto the dongle.
Click "Write" to write the firmware to the dongle.

Please also see this tutorial.

-Amanda H.