Example of using internal oscillator with BLE?

[Jeffrey Haynes]

Can someone please post a simple example of using the internal oscillator with BLE?  Modifying the ble_app_blinky example to use the RC would be ideal.  No matter what I do I can't get it to work (depending on what I try I get different internal errors) and simply changing the sdk_config does not seem to work.

[RK]

which internal oscillator, the 32kHz or the 16/64MHz (you don't say what chip you're using). What 'internal errors', we can't guess. 

[Jeffrey Haynes]

I wonder why the forum forces you to select the part if it isn’t going to show up here...

NRF52840. Various errors. I’m looking for an example of how to do this correctly, not feedback on what I’ve tried. Thanks. 

[RK]

and you still didn't answer the question about which internal oscillator you're trying to use. If it's the internal HF clock oscillator then the simple answer is you can't do it. 

[Jeffrey Haynes]

The LF oscillator

[Sigurd]

Hi Jeff,

In sdk_config.h, make sure that you have the following:

// </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_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 1
#endif

[Jeffrey Haynes]

Thanks, I’ll give it a try!