nrf52_dongle cannot drive neopixels on P0_02

[jerryneedell]

I have a 16 neopixel ring and I found that if I connect it to the nrf52840 Dongle on Pin P0_31 or P1_15 it works fine, but on Pin P0_02 it does not. No error is thrown, bit the neopixels just don't light up.

From the data sheet P0_02 is also AIN0. Could that be relevant?
I am using VDD to power the ring.
I also tried a 7 neopixel "jewel" with the same result.
Is there something "special" about P0_02?

I tried the same test on feather nrf52840 DK PCA10056 with the neopixel ring connected to P0.03 (AIN0 on this board) and it works fine there.
I also connected it to P0_02 on the PCA10056 and it also works there.

Just to round it out, I tried it on a feather_nrf52832 using A0 and it also works fine.
Something different with the "dongle"

[jerryneedell]

hmm - I just hooked up my scope and there is no signal going out on P0_02. It looks like it is "floating" near 0V.
I tried just setting it manually high or low and no response. P0_31 responds as expected.

[jerryneedell]

False alarm -- I hooked up another Dongle and it works on P0_02!! :-(
Its not a simple soldering problem on the board - I checked right at the pad, but for some reason that Dongle does not talk to P0_02.
Closing this since it appears to be a HW issue.