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]

Hi,

Make sure you have followed the getting started:

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/nrf51_getting_started.html?cp=5_1_1

Depending on the example you are using, the LED1 and LED2 may have different meaning. Please refer to the central and peripheral example you are using on what they mean.

Kenneth

[americanhoney]

I see absolutely nothing there that addresses or can help with this situation so the RTFM reply doesnt help. additionally there only 1 single central BLE example in nRF5_SDK_15.3.0_59ac345 so the comment 'depending on the example you are using' is also not helpful.  lastly LED1 means not partnered, LED 2 means partnered (as explained by Nordic <aka you>)

https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v15.3.0%2Findex.html

[americanhoney]

No

[americanhoney]

I put 

NRF_CLOCK->LFCLKSRC=0;

as the first line in the main program.  didnt fix the problem though

[americanhoney]

even added:

NRF_CLOCK->TASKS_LFCLKSTART=0;
NRF_CLOCK->TASKS_LFCLKSTOP=1;
NRF_CLOCK->LFCLKSRC=0;
NRF_CLOCK->TASKS_LFCLKSTOP=0;
NRF_CLOCK->TASKS_LFCLKSTART=1;
while(!NRF_CLOCK->EVENTS_LFCLKSTARTED);

didnt work either

[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.