JLink fails to program PCA100028

[eyalasko]

Hi,

All of a sudden (isn't it always the case :) the JLink debugger fails to flash the app code to the dev kit (PCA100028) The Project's softdevice is flashing well without any problem and so does sample projects so the problem is not with the hardware..

Error dialog says "No Cortex-M device found in JTAG chain" Output window message says "RESET high but should be low"

Power cycles do not help (though, as mentioned, the hardware works well with other projects and same project softdevice flashing).

What can be the problem? What project propert (in projetc configuration dialogs) could go wrong and cause this behavior ?

Thanks for any advice. Any thoughts?

Thanks

[Sigurd]

Hi,

Looks like you have configured Keil to use JTAG instead of SWD. Make sure that you have "SW" under PORT in the Jlink driver setup:

[eyalasko]

Hi Sigurd, thanks for your prompt reply.

I've followed your instruction. however now I get another error message...

What should be the next step ?

Thanks again.

[Sigurd]

Please download and use SDK 12.3 from here and the latest nRF5x Command line tools. If you want a GUI to flash the SoftDevice you can also download and install nRF Go Studio.

Use either nrfjprog(nrfjprog -f nrf51 -e) or nRFGo Studio to do a chip erase. Then flash the chip with the S130 v.2.0.1 SoftDevice. This SoftDevice can be found in the folder SDK12_3_folder\components\softdevice\s130\hex. Then use Keil to flash the example application. The example application will be placed at top of the SoftDevice in flash.

[eyalasko]

Hi,

I've Followed your guidelines - 'Erase all' then 'Program soft device' ( nRF5_SDK_12.3.0_d7731ad/components/softdevice/s130/hex/s130_nrf51_2.0.1_softdevice.hex).

Unfortunately I still get "Flash download failed - Cortex M0" error message when trying to load through keil MDK ....

[Sigurd]

Did you enable readback protection? Try to do a nrfjprog --recover, and then program the SoftDevice, and then the application.

Also make sure that your "Options for Target" configuration looks like this: