nRF52840 Custom board needs restart its time I upload new firmware

[Nikosant03]

Hi everyone,

I am using the custom nRF52840 module provided by Raytac. I integrated into my evaluation board and I flash it using SWD and JLink debugger. My problem is that its time I flash the module I have to restart it before the code start taking action.. For example if I flash the module with a ble peripheral example, is will only start advertising when I restart it by pulling down the reset pin. When I used to play with nRF52840 DK, I remember that it wasn't necessary to restart the module after flashing it..

Is this normal?

Thanks

Nick

[Amanda Hsieh]

Hi Nick, 

How do you program the file? If you program with the command tool, you should perform reset with "nrfjprog --reset" after the programing as this post. 

-Amanda H.

[Nikosant03]

Hi Amanda, 

I build and run the firmware directly from Segger IDE.

Nick

[Amanda Hsieh]

Hi Nick, 

Would you need extra reset if you use the command line tool to program as this post?

Are you able to use Segger to debug and perform reset?

-Amanda H.

[Nikosant03]

Hi Amanda,

I confirm that using the cmd I can program the module with the command 

nrfjprog -f NRF52 --program file.hex --chiperase -r

Also, what I've noticed is that when I flash the board using SES with any of the exampleS provided in SDK, I do not need to reset the module. But when I flash using my firmware I have to reset the module.

So I suppose that this is software related issue? Does Nordic's examples somehow performs a soft reset after flashing?

Nick

[Amanda Hsieh]

Hi Nick, 

Not sure what causes the issue. You could try to duplicate the SDK example as the base and modify it with your code.

-Amanda H.