Couldn't connect 52810 successfully during DFU mode

[bean]

according to this article to modify my code. https://devzone.nordicsemi.com/f/nordic-q-a/27185/52810-how-to-use-dfu

It  could be scanned but couldn't connected.

Is there anything i omitted ?

[Sigurd]

Hi,

• Are you using nRF Connect for Desktop or Mobile to connect ?
• What happens when you try to connect? do you get any error messages ?

[bean]

Hi 

I do use nRF Connect to connect !

there are two boards, a product demo (52810)  and  a nordic PCA10040.

I needed to use dfu on 52810,  so  I made some modification base on SDK14.2.0.

I got these modification from https://devzone.nordicsemi.com/f/nordic-q-a/27185/52810-how-to-use-dfu

-----------------------

1. softdevice : nRF5_SDK_14.2.0_17b948a\components\softdevice\s112\hex

2. project: nRF5_SDK_14.2.0_17b948a\examples\dfu\bootloader_secure_ble

after compiling ...

Using nRFgo studio:

1. erase all

2. program softdevice

3. download bootloader by keil

if I do these operation on 52810 , advertising is ok but can't be connected. 

to do these operation on PCA10040 , everything is ok !

[bean]

sorry, it's my fault !  the softdevice clock source that I configured is wrong ..  

[Sigurd]

Great that you got it working 

[Ralph]

Hi, I have the same issue. 

May I ask what & where is softdecive clock source? 

Thanks.

[Sigurd]

Hi Ralph, see this page for information about the SoftDevice clock source. If you don't have LF crystal, you will need to use the RC Oscillator. You need to set the clock source in sdk_config.h. To use the RC Oscillator, you would need to set the following defines:

// </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