ble_stack_init nrf_sdh

[Cy]

I am inquiring about a custom device that hangs in the ble_stack_init(); and the result is a fatal error.

The custom device has an nRF52832 

The SDK is the SDK14

The project is a basic UART over bluetooth

The project will run without the fatal error on a nRF52832 DK

I have turned on debugging and have been given three statements:

<info> app: here
0> <debug> nrf_sdh: State request: 0x00000000
0> <debug> nrf_sdh: Notify observer 0x0002B474 => ready
0> <debug> nrf_sdh: State change: 0x00000000
0> <error> app: Fatal

Any help provided would be appreciated. 

[Simonr]

Hi

The first thing that comes to mind is that your custom device lacks either the external HF(32MHz) or LF(32.768kHz) crystal. Can you tell me more about your custom device? If the external LF clock is missing you will have to make the following changes in the sdk_config.h file:

// <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

If the HF clock is missing, then you will have to revise your HW design, as this is a crucial component.

If you could share the schematics of your custom device, that would be great. Keep in mind that this case is public though, so if you don't want to share the schematics with the community, we should set this case to private mode (where only yourself and Nordic engineers can see it). If you want me to do so, just say so, and I will set this case to private mode.

Best regards,

Simon

[Cy]

Simon,

Thank you, I have both the HF and the LF. Attached is the custom device loosely based on the reference circuitry of specification v1.4. The devices are running well as it is running my application, some sensors and a display.