using Power Profiler with PPK2 and nRF52840

[roy0]

I'm using the PPK2 to develop a product with this device: https://wiki.seeedstudio.com/xiao_nrf52840&_wio_SX1262_kit_for_meshtastic/

Specifically, I am using the Digital Channels (Logic Analyzer) to view some pins on initial power up.  I have already STARTED the trace, and I'm ready to power up the device over USB.

However, when I plug in the nRF52840 to USB, the Power Profiler RESETS, and I am unable to capture the Digital Channels I am interested in.

It seems like the Power Profiler is reseting because it detects the nRF52840, whereas I was already connected to the PPK2 and ready to make the measurements before the reset.  I am not interested in the Power Profiler connecting to the nRF52840.  (The USB connection with my laptop is required for serial debug.)

I hope this is a sufficient description of the problem.

Thanks in advance for any help.

[Turbo J]

A schematic would be helpful here - descriptions are never as good as a schematic.

Could be that the act of plugging in somehow causes an USB reset for the profiler board. Could also just be a bad USB cable.

I'd try using a powered USB hub (i.e. one with its own wall wart power supply) in case the laptop or dock does something funny when connecting USB devices.

Alternatively you could try using an USB-C-to-A host adapter on a smart phone/tablet and connect the NRF5240 to that USB port. This way you don't mess with the laptop USB at all..