Trying to setup DFU on PCA10056 to look like PCA10059

RE: Trying to setup DFU on PCA10056 to look like PCA10059

Dave Hylands — Fri, 11 Jan 2019 18:52:42 GMT

Indeed, that does seem to be the problem. If I put a 10K resistor between P0.18 (on P24) and VDD_NRF (on P20) then it works as expected when powering through NRF_USB. Looking at the schematics, I suspect that populating R54 will achieve the same result.

RE: Trying to setup DFU on PCA10056 to look like PCA10059

Jørgen Holmefjord — Fri, 11 Jan 2019 15:30:21 GMT

Hi,

Most likely the reset button (SW5) is not powered by the VDD_USB, leaving the RESET pin floating. This could cause a reset and the bootloader to see this as the button being pushed.

Can you try pulling the reset pin high while powering through NRF_USB?

Best regards,
Jørgen

RE: Trying to setup DFU on PCA10056 to look like PCA10059

Dave Hylands — Thu, 10 Jan 2019 19:02:00 GMT

Not sure what this means, but if I power the DK using the J-Link USB port then it runs the blinky app, whereas if I power it via the nRF USB connector it starts the DFU bootloader.