Hi,
Edited topic to match the issue:
I've just started poking around with nrf52 chip and I'm now in process of waking up custom hardware, but I seem to have issue with NFC. It's propably something in the hardware, but I'm having hard time digging out to the root cause.
I use nrf sdk sample applications at the moment, so the code itself compiles and runs fine on nrf52-DK. Thus the code is likely ok :)
If I use any of the nfc examples, I get stuck on what seems to be a reset loop. I downloaded keil compiler evaluation version today to get nicer debug interface and bit visibilty to where the code hangs.
If I take eg. examples/nfc/record_url/pca10040 it will reach line 70: ret_val = nfcSetup(nfc_callback, NULL); and stepping to/over this line seems to be where the reset happens.
Hardware seems to work to some extent, I can run eg. blinky, led_softblink and ble_app_beacon with no issues, but nfc related thing seem to cause this hang.
So in a brief, what could happen instantly on this nfc setup part? What HW modules should I suspect?
There is steady 3v on the board, cannot trigger to any voltage drops when stepping from debugger to this line or otherwise.
Oscillators seem to be fine as I can measure good and steady voltage levels from both external XTALS when running these other examples.
NFC antenna is also fine electrically, I get nice clean sine waveform when applying it to external field (phone).
nRF52 devices are same revision on DK and my custom board, but different batch.
Thanks for any pointers and thoughts.
