Can't change clock source from NRF_LF_SRC_XTAL to NRF_LF_SRC_RC

Question

Hi 
 I changed the clock source from NRF_LF_SRC_XTAL to NRF_LF_SRC_RC, but it dit not work. 
 In the migration guide( Migration Guide ) I found out, that the method SOFTDEVICE_HANDLER_INIT was replaced by nrf_sdh_enable_request(). The SOFTDEVICE_HANDLER_INIT had as argument the clock source but the nrf_sdh_enable_request() method does not have any arguments. 
 How can I set the clock source? 
 Thanks, 
 Werner

Vidar Berg · Accepted Answer

Hi, nrf_sdh_enable_request() will apply the clock settings from sdk_config .h. Here's an example: // Clock - SoftDevice clock configuration //========================================================== // 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 // NRF_SDH_CLOCK_LF_RC_CTIV - SoftDevice calibration timer interval. #ifndef NRF_SDH_CLOCK_LF_RC_CTIV #define NRF_SDH_CLOCK_LF_RC_CTIV 16 #endif // NRF_SDH_CLOCK_LF_RC_TEMP_CTIV - SoftDevice calibration timer interval under constant temperature. // How often (in number of calibration intervals) the RC oscillator shall be calibrated // if the temperature has not changed. #ifndef NRF_SDH_CLOCK_LF_RC_TEMP_CTIV #define NRF_SDH_CLOCK_LF_RC_TEMP_CTIV 2 #endif // 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 1 #endif Note that the accuracy must be set to 500 ppm when using the internal RC oscillator. You may refer to the nrf_clock_lf_cfg_t structure for more details around the clock configuration parameters.

Can't change clock source from NRF_LF_SRC_XTAL to NRF_LF_SRC_RC

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