mdbt42v-512kv2

[cavus]

As you can see in the schematic, I have a custom board, and I’m uploading code to it via J-Link. I can control the pins, turn on an LED, and read a button without any problems. However, when I try to activate BLE, the program doesn’t work properly — the device doesn’t show up on my phone, and the other functionalities also stop working. By the way, I currently don’t have a 32.768 kHz crystal connected to the PCB. Can someone help me identify where the issue might be coming from?

[Simonr]

Hi

-DNRF_SDH_CLOCK_LF_SRC=1-DNRF_SDH_CLOCK_LF_SRC=1 points to you using the external clock as a clock source. To use the internal RC oscillator, this option must be set to 0, and you need to set NRF_SDH_CLOCK_LF_RC_CTIV =16, NRF_SDH_CLOCK_LF_RC_TEMP_CTIV=2, NRF_SDH_CLOCK_LF_ACCURACY=1 to enable calibration as well.

Best regards,

Simon