Power Profiler only flatlines at 83.31 mA using nrf52840dk

[grestuccia]

Hi,

I have an issue with the first version PPK coupled with an nrf52840dk. I used to measure the current on the board through the nRF Connect desktop app on Linux and it always worked fine. Now, with the 3.7.0 new release and the new GUI, the app only shows a flatline at 83.31 mA instead of a dynamic value when measuring the power consumption in real time. I checked that all the switches were set correctly as before, but there is not anything that I change that modify this behavior. Is there something that I am missing? I am currently using Linux Mint 20.2, kernel version 5.4.0-81 and nrf Connect 3.7.0 with Power Profiler v3.1.2.

Thank you for the help.

[grestuccia]

As a followup, I ran the old version of the Power Profiler app (v.2.3.1) to see if anything changes. Unfortunately, the issue is still present.

[Håkon Alseth]

Hi,

 

How have you connected the nRF52840-DK?

Ampere-meter or source meter?

 

Does it behave like this with both configurations (remember that these require different physical hardware setup) ?

 

Kind regards,

Håkon

[grestuccia]

Hi, thanks for the fast reply.

The nrf52840dk is connected through usb to the computer. SB40 has been cut. Power source is set on VDD. The PPK is set on top of the board and everything is set to DK, as explained here: https://infocenter.nordicsemi.com/topic/ug_ppk/UG/ppk/ppk_power_supply.html Could you please tell me how to change the type of meter on the first version of the PPK and measure the different behaviors?

Gabriele

[Håkon Alseth]

Hi,

  

grestuccia said:

The nrf52840dk is connected through usb to the computer. SB40 has been cut. Power source is set on VDD. The PPK is set on top of the board and everything is set to DK, as explained here: https://infocenter.nordicsemi.com/topic/ug_ppk/UG/ppk/ppk_power_supply.html Could you please tell me how to change the type of meter on the first version of the PPK and measure the different behaviors?

 PPK v1 uses RTT (over the SWDIO/SWDCLK lines), so it's unfortunately easy to mistakenly reprogram the PPK itself with your own firmware.

Could you try to re-program the PPK?

The .hex file for PPK v1 can be found in the .zip here (nRF6707-SW):

https://www.nordicsemi.com/Products/Development-hardware/Power-Profiler-Kit/Download#infotabs

 

Kind regards,

Håkon

[grestuccia]

Thanks again for the support. Could you please tell me the procedure to re-program the PPK? Do I just have to put the PPK on top of the nrf52840dk, connect the usb to the nrf52840dk (not to the PPK), enter the nrf Connect's Programmer, load the hex and go to "Erase and Write"?

Here is the preview that the Programmer app shows to me when I do that procedure (without erasing and writing anything, but just reading):

Sorry to bother.

Gabriele