nrf51822 is so easy to be damaged?

RE: nrf51822 is so easy to be damaged?

Andrew Wilson — Fri, 11 Mar 2016 19:03:53 GMT

This .bat suggestion was very helpful to me -- thank you!

RE: nrf51822 is so easy to be damaged?

Charles Chow — Thu, 06 Nov 2014 08:31:08 GMT

Thanks Juha suggestion, my board saved.

RE: nrf51822 is so easy to be damaged?

Tim — Wed, 21 May 2014 16:10:05 GMT

Juha: Thanks so much! Worked perfectly. This should really be built into the "recover" function.

RE: nrf51822 is so easy to be damaged?

Dan — Wed, 13 Nov 2013 01:48:25 GMT

Hi Juha Thank you for your answer,I save my board successly according to your method.

best regards

RE: nrf51822 is so easy to be damaged?

Juha Okkonen — Tue, 12 Nov 2013 12:38:08 GMT

Luckily there is easier way to reset chip. Run JLink Commander ( JLink.exe ) and in it's command window give following commands; si 1 r h w4 4001e504 2 w4 4001e50C 1 w4 4001e514 1 r

That reset's whole flash, so you need to program Softdevice again, if you have one. Håkon, with what commands could we erase application only??

RE: nrf51822 is so easy to be damaged?

Håkon Alseth — Tue, 12 Nov 2013 10:14:56 GMT

As Juha says, you are most likely in a reset-loop due to assertions in your application. I've done this a couple of times myself, and you will just have to try different combinations of power-cycling and running "--recover".

Create a batch file similar to this: :run nrfjprog.exe --snr XXXXXXXX --recover ping -n 2 127.0.0.1 goto run

Note that the ping is just to add a 1 sec delay.

BR Håkon

RE: nrf51822 is so easy to be damaged?

Juha Okkonen — Tue, 12 Nov 2013 10:00:39 GMT

I have identical behaviour caused by processor resetting at 44Hz. This reset is caused by SW bug I'm unable to debug.

I think reset comes too fast for the Segger to do anything useful with default settings. It seems to me that some simpler halt or erase operation is needed to break vicious cycle of resets.

RE: nrf51822 is so easy to be damaged?

Your Name — Tue, 12 Nov 2013 02:27:29 GMT

Hi thanks for you reply,I am trying recover in nrfgo studio.but it gave me the infomation is as below: Could not read AHB-AP Id,Could not cnonect to target.

Running application C:/DOCUME~1/dan.sun/LOCALS~1/Temp/nrf51Studio/nrfjprog.exe --snr 518002423 --recover System off disabled until pin reset or power on reset is done. ERROR: An error occurred while connecting to the device

I tried from command line nrfjprog --recover it prompt" Applying pin reset if debugger is not active System off disabled unti pin reset or power on reset is done Halting device. ERROR: Cannot connect to the nRF51 device

RE: nrf51822 is so easy to be damaged?

Håkon Alseth — Mon, 11 Nov 2013 14:35:57 GMT

Hi,

Most likely, your device has gone into systemoff mode, and in this mode the debugger interface is detached.

Try using nrfjprog from the command line to recover the device: nrfjprog --recover

If you used the nRF51 SDK installer, then nrfjprog should be located in your windows PATH (you can call it from where-ever).

Best regards Håkon