Example of using internal oscillator with BLE?

RE: Example of using internal oscillator with BLE?

Yohann — Wed, 20 Jul 2022 15:36:05 GMT

4 years later and I had the same issue, thanks you for this thread!

I had to solder DEC4 and DEC6 together and set

#define NRF_SDH_CLOCK_LF_SRC 2 
#define NRFX_CLOCK_CONFIG_LF_SRC 2
#define CLOCK_CONFIG_LF_SRC 2

RE: Example of using internal oscillator with BLE?

Rob Philip — Wed, 15 Jan 2020 20:18:56 GMT

Jeff:

Two years after this "success" posting from you I was searching to try and find out what I was configuring incorrectly on my nRF52840 using the RC clock. I saw your comment on DEC4 to DEC6 and took a look. In fact my hardware guys had *not* connected DEC4 & DEC6. A small flywire and magically my BLE radio began working. Thanks so much for coming back and making that final note on your problem.

RE: Example of using internal oscillator with BLE?

Jeffrey Haynes — Thu, 26 Apr 2018 17:04:15 GMT

Success! We were missing the external wire connecting DEC4 to DEC6 that changed in the silicon rev.

RE: Example of using internal oscillator with BLE?

Jeffrey Haynes — Thu, 26 Apr 2018 14:33:52 GMT

Just an update on this. We’ve tried using these settings with our custom board with no luck. The BLE stack, gatt, connection, advertising, etc. all happily initialize but there’s no energy at all on the antenna and no signal.

Maybe you can clarify something to assist in debugging. The LF clock definitions appear to exist in two places; in the sdk_config and in pca10056 as NRF_CLOCK_LFCLKSRC. Which is the correct one? Is the board definition a holdover from an older sdk? In short, how can I be confident that the dk board is actually using the internal oscillator?

Thanks

RE: Example of using internal oscillator with BLE?

Jeffrey Haynes — Mon, 16 Apr 2018 10:57:40 GMT

Thanks, I’ll give it a try!

RE: Example of using internal oscillator with BLE?

Sigurd — Mon, 16 Apr 2018 09:33:59 GMT

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

RE: Example of using internal oscillator with BLE?

Jeffrey Haynes — Mon, 16 Apr 2018 00:52:47 GMT

The LF oscillator

RE: Example of using internal oscillator with BLE?

RK — Sun, 15 Apr 2018 23:19:21 GMT

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.

RE: Example of using internal oscillator with BLE?

Jeffrey Haynes — Sun, 15 Apr 2018 22:45:54 GMT

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.

RE: Example of using internal oscillator with BLE?

RK — Sun, 15 Apr 2018 22:42:25 GMT

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.