Failed to start the PPK

RE: Failed to start the PPK

Jared — Wed, 05 Feb 2020 09:09:15 GMT

Hi, If you cut the solder bridge and measure the resistance then you will measure R90 as in the image, which is the resistance between VDD_nRF and VDD_nRF'. The resistance isn't specified so I can't tell for sure if 13 kOhms is the correct value but It doesn't seem like an abnormal value.

RE: Failed to start the PPK

Farit — Wed, 05 Feb 2020 05:40:22 GMT

Jared, I have other question about nRF52840 DK current measure circuit:

What resistance should be between P22 contacts with cutted SB40 contacts? I measured approx. 13 kOhms. Is this normal value?

RE: Failed to start the PPK

Farit — Wed, 05 Feb 2020 05:35:57 GMT

Are you able to erase the application on the PPK by using nrfjprog:

Yes, the app is erased successfully.

RE: Failed to start the PPK

Farit — Wed, 05 Feb 2020 05:33:32 GMT

Hi, Jared. This is incredible, but PPK started to work after connecting to other USB port in the computer.

RE: Failed to start the PPK

Jared — Tue, 04 Feb 2020 15:07:52 GMT

Hi,

Are you able to erase the application on the PPK by using nrfjprog:

nrfjprog -e

Are you using a USB hub? Have you tried changing the USB port or connecting it directly to the computer?