nrf51 422 QFAC : no device is connected ?

RE: nrf51 422 QFAC : no device is connected ?

wlgrd — Sat, 26 Mar 2016 15:25:01 GMT

That is great! Glad you get to continue working with their awesome product :) I edited my answer so that others can more easily find it. Also, please try to describe as best possible how you got it into this state, because I am sure that this is not supposed to happen under any circumstance.

RE: nrf51 422 QFAC : no device is connected ?

Nour_l — Sat, 26 Mar 2016 14:34:09 GMT

it worked like Magic : I dragged a .bin file to the external storage device Thanks again I really appreciate your help , this morning I thought that it was gone but now , thanks to you , I've got my DK back

RE: nrf51 422 QFAC : no device is connected ?

wlgrd — Sat, 26 Mar 2016 14:07:54 GMT

Yes, it is described in the user guide what file to transfer to it. The file is downloadable from nordicsemi. I just can't remember everything out of my head at the moment :/

RE: nrf51 422 QFAC : no device is connected ?

Nour_l — Sat, 26 Mar 2016 13:17:09 GMT

to be honest I do not know how to proceede after that ... it shows an externastorage device named BOOTLOADER and the led 5 keeps blinking (i take it as a very good news comparing to the previous state ) is there something I can do ?

RE: nrf51 422 QFAC : no device is connected ?

Nour_l — Sat, 26 Mar 2016 12:51:10 GMT

Seriously ... you kind of saved my life ... I'll be eternaly in debt to you the solution was "holding the reset button while powering up "

RE: nrf51 422 QFAC : no device is connected ?

wlgrd — Sat, 26 Mar 2016 12:15:35 GMT

Also, try holding the reset button while powering up and see if it goes into bootloader mode. If not, you need an external jlink debugger with a 10 pin adapter to recover the OBD

RE: nrf51 422 QFAC : no device is connected ?

wlgrd — Sat, 26 Mar 2016 12:14:22 GMT

Okay, then the nrf still has power. Have you tried flashing the board with Keil, nrfgo studio or nrfjprog? Does the board enumerate as an external storage device on your computer still? I don't have my hardware before Tuesday, but I would advise you to contact Nordic support directly, since per my knowledge at least, the Segger OBD (which has the label) should never be affected by this procedure. What version of the DK do you have?

RE: nrf51 422 QFAC : no device is connected ?

Nour_l — Sat, 26 Mar 2016 10:01:19 GMT

Hi first of all I have to admit being "stupid" as far as dealing with the board lately : I have loaded some examples and since I had issues with its response ,something like : the IDE saying everything is fine and the board acting otherwise , so I tried different IDEs and I've tried copying the .hex file multiple times (it only responded correctly to the manual file copying ) I kept doing that and I lost connectiion in the process but to mention the last program is stilll running (softled blink) I have tried to jump the 2-pin P22 (it was suggested at "similar" case ) but still no response ... I plugged different USB cables , different ports ... yet nothing have changed

RE: nrf51 422 QFAC : no device is connected ?

wlgrd — Sat, 26 Mar 2016 06:03:09 GMT

This sounds a bit serious, since this only occurs if the on board programming chip is faulty, or there are (hopefully) some power issue which are easy to fix.

Can you describe exactly how it happened?

Try plugging into other USBs, change USB cable, test wether other devices work with same USB configuration, try running the DK of a battery (LED5 will not work on battery but all others will). Can you try measuring the VDD and 5V pin while USB is connected?

Solution; you can try holding in the reset button and get it into bootloader mode. This way you can drag and drop the interface firmware (downloadable from nordicsemi) onto the board.