sd_softdevice_enable not return

[hongpal]

Hello I am using sdk version 14.0 and softdevice S332. I successfully tested on the nrf52832 board using the ant bsc example. However, when we put the code on our custom board, it can not be returned from the sd_softdevice_enable () function. I have confirmed that the other code works with RTC 32.768khz. How do I get this code to work? I am sorry for my poor English skills. I would appreciate your reply.

[Jørgen Holmefjord]

Hi,

Do you have a 32.768 kHz crystal on your board? If not, what is the softdevice clock configuration in your sdk_config.h file? Note that softdevice clock and RTC clock configuration is located on different places in the config file.

You would need something like this:

//==========================================================

// <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_XTAL_ACCURACY  - External crystal clock accuracy used in the LL to compute timing windows.
 
// <0=> NRF_CLOCK_LF_XTAL_ACCURACY_250_PPM 
// <1=> NRF_CLOCK_LF_XTAL_ACCURACY_500_PPM 
// <2=> NRF_CLOCK_LF_XTAL_ACCURACY_150_PPM 
// <3=> NRF_CLOCK_LF_XTAL_ACCURACY_100_PPM 
// <4=> NRF_CLOCK_LF_XTAL_ACCURACY_75_PPM 
// <5=> NRF_CLOCK_LF_XTAL_ACCURACY_50_PPM 
// <6=> NRF_CLOCK_LF_XTAL_ACCURACY_30_PPM 
// <7=> NRF_CLOCK_LF_XTAL_ACCURACY_20_PPM 

#ifndef NRF_SDH_CLOCK_LF_XTAL_ACCURACY
#define NRF_SDH_CLOCK_LF_XTAL_ACCURACY 0
#endif

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

Best regards,

Jørgen

[hongpal]

Yes, our board has a 32.768 kHz crystal. The default value in sdk_config.h is set to 1, 0, 0, 7 from the top. Do I need to modify the value in sdk_config.h?

[Jørgen Holmefjord]

If you have external crystal, that should work. Have you checked that the crystal is mounted correctly? Have you tested the code on the nRF52-DK (PCA10040 board)?

[hongpal]

On the PCA10040 board, we confirmed that the code was running. I will go to the company tomorrow to see if the external crystal is correctly fitted and respond. Thank you for answer.

[Jørgen Holmefjord]

You can also try to change the clock settings to the internal RC oscillator, as shown in my code above, to see if it works without the external crystal.