I have a development board and load the client central BLE blinky to it, then the peripheral BLE blinky to my custom board and power up and the central development board stays LED 1 on and never switches to LED 2.

[americanhoney]

I have a development board and load the client central BLE blinky to it, then the peripheral BLE blinky to my custom board and power up and the central development board stays LED 1 on and never switches to LED 2.  Any suggestions?

[Kenneth]

To change BLE clock source you should edit sdk_config.h, for instance

#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

You may also need to edit generic LFCK usage:

#define NRFX_CLOCK_CONFIG_LF_SRC 0
#define CLOCK_CONFIG_LF_SRC 0

Please also comment on my other questions/comments:

- Results of DTM tests.

- Pulled up UART RXD line with external pull-up.

- Did anyone from Nordic review your custom board (schematic and layout)?

[americanhoney]

I didnt have to change generic LFCK usage

Thank you very much for the help.