Softdevice not working on BT840 based custom board

[DharmitMistry]

I have been testing the softdevice codes on NRF52840 DK with NRF52840 SDK 15.2.0 which is working perfectly. But when i put the same test code in our custom board having BT840 it is not working. I am using the Ble_app_template example for s140 as test code for softdevice. Now when I flash the hex file provided by Fanstel i.e BT840_AT_3in1PC181113.hex  on the same custom board it is working perfectly, So is there any particular changes needed for BT840 chip in the SDK of softdevice, please guide i am new to nRF environment and recently 3 products are under development using BT840 chip.

[Kenneth]

Hi,

The common problem is that the nRF DK is fitted with an external 32kHz crystal, while a custom board may not be.

Can you try to change in sdk_config.h:

#define NRF_SDH_CLOCK_LF_SRC 0
#define NRF_SDH_CLOCK_LF_RC_CTIV 16
#define NRF_SDH_CLOCK_LF_RC_TEMP_CTIV 2
#define NRF_SDH_CLOCK_LF_ACCURACY 1

Best regards,
Kenneth

[DharmitMistry]

thanks Kenneth  i have apply the softdevice clock configuration changes as suggested by u and now it is working perfectly

Thanks,

Dharmit