Exit from debug mode

[Jérémy Michaud]

Hello,

I did some power measurement on the nrf52 DK with the Nordic profiler kit and the result was way more than what we could expect from a nrf52 (about 1 mA). Even in power off mode, it still needs about this amount of current.

After a search on the devzone, I discovered that it could be because the nrf52 is in debug mode. In this mode, the nrf52 never goes on power down mode et consume way more than in normal mode.

I tried to power reset the chip in order to enter normal mode. But I didn't work.

I also tried nrfjprog --pinreset, but it didn't change anything either.

Finally, I saw on that thread that the code to know whether the debug mode is enabled or not is :

if (DWT->CYCCNT != 0) { bsp_board_led_on(LED); }

And the LED is always on when I run this code.

Is there a solution to exit the debug mode ?

[Jérémy Michaud]

Hello, thank you for this answer. I tried it but unfortunately, it didn't work.

I did a couple of tests to be more precise about my issue.

First of all, I discovered that when I press the reset button, It works when the Profiler kit is unplugged but not when it is plugged.

Secondly, I am not sure if this problem is linked to debug mode or another issue. I found the codeif (DWT->CYCCNT != 0) { bsp_board_led_on(LED); } on the devzone but I am not actually sure whether this is the right way of doing it or not.

To be sure of the problem, I installed the latest version of the SDK (14.0.0) and I flashed the S132 (5.0.0) to the nrf52 DK. Then I flashed the ble_app_hrs example. I opened the profiler kit sotfware and I have an average consumption of about 1 mA :

And when I am in power off mode, the average consumption is about 700 uA :

I think these values are far away from what it should be, but it could be linked to another problem.

[Jérémy Michaud]

Ok, thank you for your procedure, I just checked everything:

• cut SB9 on the dev kit : [ OK ]
• set SW2 and SW4 in the DK position on the PPK : [ OK ]
• connected the USB cable to the DK and not the PPK : [ OK ]
• and power cycled the DK after flashing the hex file? : [ Not sure ]

What do you mean with the last point? Power off and on again? If that is the case, yes I did.

I want again to say that when my DK is connected to the PPK, the reset button doesn't work anymore. Is it normal?