Laird BLE654 with Segger embedded Studio and NRF SDK

[Andreas48752]

Hi!

I am using the Segger embedded Studio with PCA10056 successfully. Now I have to evaluate LARD DVK-BL654 (because it has external antenna). I found a guide which says to use eclipse (Junu version, which is old?).

So I was wondering if I could use Embedded Studio also for LAIRD? Is this just something like a board configuration thing?

I already changed  the clock according to the guide i found:

"By default, the BL654 uses the nRF52840’s on-chip RC oscillator as its clock source, as opposed to the nRF52840 development kits which use an external crystal. The difference in oscillator source should therefore be reflected in the SDK".

It compiles and I can select debug (connection to device via j-link is done) but after that nothing happens...

Can somebody help?

Thanks,

Andreas

[Andreas48752]

As I am using SDK 15.2 I changed the code in "nRF5_SDK\components\softdevice\common\nrf_sdh.c" back to original and tried to set parameters with the projects sdk_config.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 // updated 2019-04-18 to reflect Nordic's recommendations
#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 // updated 2019-04-18 to match Nordic's latest nRF52 specifications
#endif

// <e> NRFX_CLOCK_ENABLED - nrfx_clock - CLOCK peripheral driver
//==========================================================
#ifndef NRFX_CLOCK_ENABLED
#define NRFX_CLOCK_ENABLED 1
#endif
// <o> NRFX_CLOCK_CONFIG_LF_SRC - LF Clock Source
 
// <0=> RC 
// <1=> XTAL 
// <2=> Synth 
// <131073=> External Low Swing 
// <196609=> External Full Swing

#ifndef NRFX_CLOCK_CONFIG_LF_SRC
#define NRFX_CLOCK_CONFIG_LF_SRC 0
#endif

// <h> nRF_Drivers 
// <e> NRF_CLOCK_ENABLED - nrf_drv_clock - CLOCK peripheral driver - legacy layer
//==========================================================
#ifndef NRF_CLOCK_ENABLED
#define NRF_CLOCK_ENABLED 1
#endif
// <o> CLOCK_CONFIG_LF_SRC - LF Clock Source
 
// <0=> RC 
// <1=> XTAL 
// <2=> Synth 
// <131073=> External Low Swing 
// <196609=> External Full Swing

#ifndef CLOCK_CONFIG_LF_SRC
#define CLOCK_CONFIG_LF_SRC 0
#endif

But still NRF_CLOCK->EVENTS_LFCLKSTARTED is not set, so clock_initialization() does not complete. I think I set everything like it should? Maybe you or someone else already used BLE654 and has some comments on what to change?

Thanks for all the support...

[awneil]

Did you see the Rigado blog post - linked from the mentioned thread?

https://devzone.nordicsemi.com/f/nordic-q-a/46564/error-133-0x85-gatt-error-on-nrf52840/185362#185362

That seems to be the most complete description of all the things that need to be changed to work with the internal RC.

For editing the sdk_config.h file, see:

https://devzone.nordicsemi.com/f/nordic-q-a/45362/cmsis-configuration-wizard---option-highlighting/178343#178343

[Vidar Berg]

Hi,

It looks like the BSP example accesses the clock register directly instead of using the clock driver, so the clock configuration from sdk_config.h will not be applied. 

Remove this line from the clock_initalization routine in order to use the internal RC:  

NRF_CLOCK->LFCLKSRC = (CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos);

[Andreas48752]

Hi,

Thank you for your reply. I wasn't able to check this because we ended Laird evaluation for other reasons. I will mark as suggested answer...

[awneil]

Vidar Berg said:

It looks like the BSP example accesses the clock register directly instead of using the clock driver, so the clock configuration from sdk_config.h will not be applied

So that's another thing which needs to go into your blog post / app note / whatever on how to properly configure for & use the internal RC:

https://devzone.nordicsemi.com/f/nordic-q-a/46564/error-133-0x85-gatt-error-on-nrf52840/185362#185362