hang in sd_softdevice_enable() when use nRF52840 Internal oscillator

Question

Hi,

I am try to configure internal RC (LFCLK) but device hang in "sd_softdevice_enable(&clock_lf_cfg, app_error_fault_handler);" API.

Changed in "sdk_config.h" to enable internal RC.

Used "...\...\nRF5_SDK_15.2.0_9412b96\examples\ble_peripheral\ble_app_hrs\pca10056\s140\arm5_no_packs" HRS sample code.

// </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 16
#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 2
#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 1
#endif

Ref link: https://devzone.nordicsemi.com/f/nordic-q-a/50338/nrf52840-internal-oscillator-soft-device-enable-hanging?ReplySortBy=CreatedDate&ReplySortOrder=Descending

Thanks,

Nirav Patel

Einar Thorsrud · Accepted Answer

Hi, 
 I see. I am not able to reproduce this issue with the production chip, but I can reproduce it with 0.9.0, which has an old engineering sample IC. You should not use that for development, as the chip has a number of issues that were fixed in the production version. The release SoftDevice and SDK's no longer include workarounds for issues that were fixed in the production version (revision 1). So the recommendation here is to test with a newer version of the nRF52840 DK (PCA10056) - at least one which has the production IC.

hang in sd_softdevice_enable() when use nRF52840 Internal oscillator

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