nRF52 Digital Pin P0.20 issue

RE: nRF52 Digital Pin P0.20 issue

Jørgen Holmefjord — Fri, 06 Oct 2017 12:34:11 GMT

If you are using Adafruit nRF52 feather as a design reference and are using their firmware, you might want to ask Adafruit what could be causing this issue? I see that P0.20 pin is used to put the board into DFU/bootloader mode, but it should still be possible to resurpose this pin when you are in normal application mode. I can't see any components in the schematics that could be causing this behaviour, so the issue should be in some of the firmware.

RE: nRF52 Digital Pin P0.20 issue

RK — Thu, 05 Oct 2017 03:06:42 GMT

well don't be sorry about it - use the edit menu to format it properly - there's a code button you can use (which basically indents every line 4 spaces).

RE: nRF52 Digital Pin P0.20 issue

Searay — Thu, 05 Oct 2017 01:41:04 GMT

Sorry about the formatting... Thank you for the formatting answer.

We found the problem. The board layout software chose to connect 2 nets. The pin was grounded, and could not change state.

The interesting side effect was now we could not program the part until we discovered we NOW had to pull pin p0.20 low to program it. Fortunately, there is a switch attached to that pin.

Thank you,

Greg