nRF51822 bonding failed

[Yi Su]

Hi,

I have a custom board with nRF51822 chip on it and tried to run the proximity sample program on it. I have used the nRF51822 develpment board + nRFgo Motherboard to tested my code and everything worked fine. BTW I am using SDK version 4 and softdevice s110_nrf51822_5.2.1. After that, I downloaded the same code to the custom board, it was broadcasting ok, I could see it from the proximity demo program, but when I tried to connect it, it showed: bonding... bonding failed. I attached the schematic and the screenshot of bonding failure error below. Can anybody help me figure out the problem? Thanks!

log after change crystal.txt

log before change crystal.txt

[Hung Bui]

Hi YiSu,

Have you tried to use the 32kHz RC instead of the 32kHz crystal ?(by using for example NRF_CLOCK_LFCLKSRC_RC_250_PPM_4000MS_CALIBRATION in SOFTDEVICE_HANDLER_INIT())

Could you send me a close up photo of your board ? Have you tried with our stock SDK example or only with your firmware ? Could you try with other example, such as ble_app_hrs.

Do you have the same issue all the time when using Master Control Panel ?(connection BTLE_CONN_FAILED_TO_BE_ESTABLISHED )

[Yi Su]

Hi Hung Bui,

Thank you for your suggestion. It seems the 32kHz crystal is not working properly in my custom board. I tried to use the 32kHz RC, and the board bonded and was able to transmitting data.