Can't find the bluetooth signal through the mobile phone

[ticture]

Hello, I use the internal crystal, the application in my board runs normally and it shows the board is in fast advertising state. However, I can't find bluetooth signal through my mobile phone, what should I do?

[Simonr]

Okay, I see that you've removed both of your crystals in your design If you take another look at the reference schematic only the X2 (32.768kHz) is the only optional crystal, and the HF crystal X1 (32MHz) crystal is required for the board to use certain features (like the radio for instance). This will need to be included in your board to work properly.

You should also make some changes to the decoupling capacitors you're using, as these should be set to the same values 100nF/pF instead of 12pF. You should also include the capacitors on the VDD pins for optimal performance.

Best regards,

Simon

[ticture]

Thanks for you help! I will try it as soon as possible, but I also have a question that I only use code to control the internal crystal but not control the HF crystal X1 (32MHz) crystal, will crystal X1 run normally? Should I add additional code to control the X1 crystal, or it is already in the protocol stack?