NRF52840DK + PPK2

RE: NRF52840DK + PPK2

Simonr — Thu, 24 Feb 2022 11:28:51 GMT

I tested this on my end and was surprised that I saw the same current consumption as you reported. That is, until I realized that I had missed a rather vital configuration. By setting CONFIG_SERIAL=n you should see this noise floor go down. The Dongle does not have this enabled by default which is why you saw the lower current consumption on it. Sorry it took so long for me to realize.

Best regards,

Simon

RE: NRF52840DK + PPK2

JulianKaroliny — Wed, 23 Feb 2022 14:11:51 GMT

Hey,

I just checked and measured SB40 again to make sure but it should be fine

prj.conf ist:

CONFIG_BT=y

CONFIG_BT_DEBUG_LOG=n

CONFIG_BT_SMP=y

CONFIG_BT_PERIPHERAL=y

CONFIG_BT_DIS=y

CONFIG_BT_DIS_PNP=n

CONFIG_BT_BAS=y

CONFIG_BT_HRS=y

CONFIG_BT_DEVICE_NAME="Zephyr Heartrate Sensor"

CONFIG_BT_DEVICE_APPEARANCE=833

So I hop it is fine

I made a prestine build again just to be sure, flashed everything new and pluged out and in all connection, but still I have the same results.

I also checked the SW6 in both configurations nRF Only and Default and the result is for both the same (although of course in "Default" the LED of the onboard j-link is on and I am able to flash)

It is really pretty strange because if I flash the programm on the Dongle everthing works just fine :-/

BR

Julian

RE: NRF52840DK + PPK2

Simonr — Wed, 23 Feb 2022 13:42:01 GMT

Hi Julian

Yes, you said you had tried in Ampere mode, I just wanted to make sure it was connected correctly in Ampere Meter mode as well, and it seems like it is. There's some reflection on the solder bridge which makes it hard to see if it is cut correctly, but this wouldn't be the behavior you would see with an uncut SB40. Have you tried power cycling the board after programming it with the CONFIG_BT_DEBUG_LOG=n config? That's necessary to exit the "debug" mode on the DK. Try turning the board off, removing all power sources to the DK, before attaching them and turning the board back on.

Best regards,

Simon

RE: NRF52840DK + PPK2

JulianKaroliny — Tue, 22 Feb 2022 10:12:57 GMT

Hey, thanks for your reply
As I already wrote i also tried the Ampere Meter Mode.
Here is a Screenshot of the power profiler and how i did the cable connections (I hope you can also see the board configurations/switches)

Power Profiler:

Connection with board:

(both (PPK2 and DK) are connected to the computer

Julian

RE: NRF52840DK + PPK2

Simonr — Tue, 22 Feb 2022 08:56:14 GMT

I assume you have connected the PPK2 to the DK as seen in the PPK2 user guide. Unfortunately it only tells you how to correctly connect to an nRF91 DK (we're working on improving this). The Ampere Mode is easier to use as it connects as explained in the PPK2 user guide, and should give you correct results there. The noise might come from various sources in the DK itself and you can try switching SW6 to nRF ONLY mode to see if that reduces the average current more.

Best regards,

Simon

RE: NRF52840DK + PPK2

JulianKaroliny — Mon, 21 Feb 2022 16:18:06 GMT

small update, flashed the program for testing on a NRF52840 dongle (PCA10059) and connected the the PPK2 with source mode directly to the Vbus and ground pin.

Here the results seem to be more reasonable (see picture), at least i don't have this strange noise and way less average current

Maybe I am using the DK wrong :-/