PPK and nrf52840-DK App always returns "failed to read ppk metadata"

RE: PPK and nrf52840-DK App always returns "failed to read ppk metadata"

davlion — Wed, 27 Feb 2019 21:39:33 GMT

I should also mention for anyone else that's reading this thread that I can now use either the Segger-OB when the PPK-comm is set to 'dk', or a standalone Segger when the PPK com switch is set to 'ext'.

RE: PPK and nrf52840-DK App always returns "failed to read ppk metadata"

davlion — Wed, 27 Feb 2019 21:37:50 GMT

Thanks, Jeff. Followed all your suggestions and finally got the PPK working. I did have to switch around one gpio-line. I was using P0.26 as a strobe and that didn't play well with the PPK. Moved the strobe to P0.14 and all's well.

RE: PPK and nrf52840-DK App always returns "failed to read ppk metadata"

Jeff4BLE — Mon, 25 Feb 2019 19:31:27 GMT

The most likely issue is power profiling software is communication with the MCU on the DK and not the MCU on the PPK. When stacked, make sure that the COM switch on the PPK is set to DK when programming your application and EXT before launching the nrf-Connect for desktop. The other common issue is the jlink driver has not released the virtual com port and when the power profiler software is launched, it doesn't find a free virtual com port.

In addition, be sure you are using the current Segger Jlink software and that one one instance of the driver is active. This may require rebooting the PC. To avoid this problem be sure to disconnect the virtual com port before exiting the Power Profiling software.

If the above does not immediately resolve the issue, the initial testing should use the most straight forward power configuration. On the PPK set DUT Select to DK and Power Select to DK. Connect a USB cable only to the DK's J2. DK power switch on. On the DK, VEXT->nRF (shipped covered with tape) near the DK power switch should remain off. nRF power supply to VDD and Power to ON.

It's unlikely this is a code issue. But if you need to rule this out, use an unmodified example for your initial testing. To make it simple use an example that does not require a softdevice. For example. ...\nRF5_SDK_15.2.0_9412b96\examples\peripheral\pwr_mgmt.

Best of luck

RE: PPK and nrf52840-DK App always returns "failed to read ppk metadata"

davlion — Mon, 25 Feb 2019 18:04:13 GMT

Hello, Nordic. Shall I open a private-ticket in order to receive help?