RE: nRF8122 hangs on SOFTDEVICE_HANDLER_INIT - possible clock issue?

beorostica — Thu, 28 Mar 2019 22:45:26 GMT

Thanks ssokol for sharing your experience!. I'm currently working with the Adafruit Uart Friend Module https://www.adafruit.com/product/2479. Just like you, I spent a lot trying to figure out what was wrong with the programming process. Your solution worked for me perfectly.

RE: nRF8122 hangs on SOFTDEVICE_HANDLER_INIT - possible clock issue?

ssokol — Sat, 04 Aug 2018 20:16:00 GMT

Ah, it was the clock. I'm not sure how to get the hardware clock that supposedly exists to work, but I was able to get the RC working. The SDK has changed quite a bit since the days of NRF_CLOCK_LFCLKSRC_RC_250_PPM_8000MS_CALIBRATION. The new way of setting the clock source is to edit the NRF_CLOCK_LFCLKSRC definition to use the RC:

In pca10028.h:

// Low frequency clock source to be used by the SoftDevice
#ifdef S210
#define NRF_CLOCK_LFCLKSRC      NRF_CLOCK_LFCLKSRC_XTAL_20_PPM
#else
#define NRF_CLOCK_LFCLKSRC      {.source        = NRF_CLOCK_LF_SRC_RC,            \
                                 .rc_ctiv       = 16,                             \
                                 .rc_temp_ctiv  = 2,                              \
                                 .xtal_accuracy = 0}
#endif

That got it working. Advertised service shows up as expected. I'm going to mark this as an answer, but I would love to know if anyone else has been able to get the crystal on the PTR5188 module working.