nRF52832 example hanging on SoftDevice enable

Question

Hi,

I'm trying to run the peripheral heart rate service example on a custom board using the internal 32kHz RC oscillator. However, the code hangs when soft device is enabled, at the highlighted line below.

Project: ble_app_hrs_pca10040e_s112

CRITICAL_REGION_ENTER();
#ifdef ANT_LICENSE_KEY
ret_code = sd_softdevice_enable(&clock_lf_cfg, app_error_fault_handler, ANT_LICENSE_KEY);
#else
ret_code = sd_softdevice_enable(&clock_lf_cfg, app_error_fault_handler);
#endif
m_nrf_sdh_enabled = (ret_code == NRF_SUCCESS);
CRITICAL_REGION_EXIT();

As mentioned, I'm using the internal 32 kHz RC oscillator, and I think I have configured the definitions appropriately - they're shown below. Thanks!

Noelle



// <0=> RC 
// <1=> XTAL 
// <2=> Synth 
// <131073=> External Low Swing 
// <196609=> External Full Swing

#ifndef NRFX_CLOCK_CONFIG_LF_SRC
#define NRFX_CLOCK_CONFIG_LF_SRC 0
#endif

// <o> CLOCK_CONFIG_LF_SRC - LF Clock Source
 
// <0=> RC 
// <1=> XTAL 
// <2=> Synth 
// <131073=> External Low Swing 
// <196609=> External Full Swing

#ifndef CLOCK_CONFIG_LF_SRC
#define CLOCK_CONFIG_LF_SRC 0 // NOTE: modified from sample code
#endif

// <q> CLOCK_CONFIG_LF_CAL_ENABLED - Calibration enable for LF Clock Source

#ifndef CLOCK_CONFIG_LF_CAL_ENABLED
#define CLOCK_CONFIG_LF_CAL_ENABLED 1 // NOTE: modified from sample code
#endif




// </h> 
//==========================================================

// <h> Clock - SoftDevice clock configuration

//==========================================================
// <o> NRF_SDH_CLOCK_LF_SRC - SoftDevice clock source.
 
// <0=> NRF_CLOCK_LF_SRC_RC 
// <1=> NRF_CLOCK_LF_SRC_XTAL 
// <2=> NRF_CLOCK_LF_SRC_SYNTH

#ifndef NRF_SDH_CLOCK_LF_SRC
#define NRF_SDH_CLOCK_LF_SRC 0
#endif

// <o> NRF_SDH_CLOCK_LF_RC_CTIV - SoftDevice calibration timer interval. 
#ifndef NRF_SDH_CLOCK_LF_RC_CTIV
#define NRF_SDH_CLOCK_LF_RC_CTIV 4 // NOTE: Checks temperature for calibration every 4 x 1/4 = 1 sec
 // 0.5 Celsius is the max temperature change allowed in one calibration interval
#endif

// <o> NRF_SDH_CLOCK_LF_RC_TEMP_CTIV - SoftDevice calibration timer interval under constant temperature. 
// <i> How often (in number of calibration intervals) the RC oscillator shall be calibrated
// <i> if the temperature has not changed.

#ifndef NRF_SDH_CLOCK_LF_RC_TEMP_CTIV
#define NRF_SDH_CLOCK_LF_RC_TEMP_CTIV 8 // NOTE: Calibrates at least every 8 cal timer intervals, even if temp hasn't changed
 // 8 sec is the max time allowed between calibrations
#endif

// <o> NRF_SDH_CLOCK_LF_ACCURACY - External clock accuracy used in the LL to compute timing.
 
// <0=> NRF_CLOCK_LF_ACCURACY_250_PPM 
// <1=> NRF_CLOCK_LF_ACCURACY_500_PPM 
// <2=> NRF_CLOCK_LF_ACCURACY_150_PPM 
// <3=> NRF_CLOCK_LF_ACCURACY_100_PPM 
// <4=> NRF_CLOCK_LF_ACCURACY_75_PPM 
// <5=> NRF_CLOCK_LF_ACCURACY_50_PPM 
// <6=> NRF_CLOCK_LF_ACCURACY_30_PPM 
// <7=> NRF_CLOCK_LF_ACCURACY_20_PPM 
// <8=> NRF_CLOCK_LF_ACCURACY_10_PPM 
// <9=> NRF_CLOCK_LF_ACCURACY_5_PPM 
// <10=> NRF_CLOCK_LF_ACCURACY_2_PPM 
// <11=> NRF_CLOCK_LF_ACCURACY_1_PPM

#ifndef NRF_SDH_CLOCK_LF_ACCURACY
#define NRF_SDH_CLOCK_LF_ACCURACY 7
#endif

Noelle · Accepted Answer

Solved my own problem. I didn't change the LF clock accuracy from 20ppm to 500ppm for the RC oscillator. Should have been: 
 #define NRF_SDH_CLOCK_LF_ACCURACY 1

nRF52832 example hanging on SoftDevice enable

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