Can't find the bluetooth signal through the mobile phone

RE: Can't find the bluetooth signal through the mobile phone

Simonr — Mon, 22 Mar 2021 06:45:11 GMT

The X1 will be controlled by the SoftDevice when you use the radio in your application. No changes to your application needed. But please note that you need to configure the device to use the internal LF RC oscillator if you haven't already, as our example projects use the external LF crystal by default. Below are the configs used to use the internal LF clock.

//==========================================================
// <o> NRF_SDH_CLOCK_LF_SRC  - SoftDevice clock source.
 
// <0=> NRF_CLOCK_LF_SRC_RC 
// <1=> NRF_CLOCK_LF_SRC_XTAL 
// <2=> NRF_CLOCK_LF_SRC_SYNTH 

#ifndef NRF_SDH_CLOCK_LF_SRC
#define NRF_SDH_CLOCK_LF_SRC 0
#endif

// <o> NRF_SDH_CLOCK_LF_RC_CTIV - SoftDevice calibration timer interval. 
#ifndef NRF_SDH_CLOCK_LF_RC_CTIV
#define NRF_SDH_CLOCK_LF_RC_CTIV 16
#endif

// <o> NRF_SDH_CLOCK_LF_RC_TEMP_CTIV - SoftDevice calibration timer interval under constant temperature. 
// <i> How often (in number of calibration intervals) the RC oscillator shall be calibrated
// <i>  if the temperature has not changed.

#ifndef NRF_SDH_CLOCK_LF_RC_TEMP_CTIV
#define NRF_SDH_CLOCK_LF_RC_TEMP_CTIV 2
#endif

// <o> NRF_SDH_CLOCK_LF_ACCURACY  - External clock accuracy used in the LL to compute timing.
 
// <0=> NRF_CLOCK_LF_ACCURACY_250_PPM 
// <1=> NRF_CLOCK_LF_ACCURACY_500_PPM 
// <2=> NRF_CLOCK_LF_ACCURACY_150_PPM 
// <3=> NRF_CLOCK_LF_ACCURACY_100_PPM 
// <4=> NRF_CLOCK_LF_ACCURACY_75_PPM 
// <5=> NRF_CLOCK_LF_ACCURACY_50_PPM 
// <6=> NRF_CLOCK_LF_ACCURACY_30_PPM 
// <7=> NRF_CLOCK_LF_ACCURACY_20_PPM 
// <8=> NRF_CLOCK_LF_ACCURACY_10_PPM 
// <9=> NRF_CLOCK_LF_ACCURACY_5_PPM 
// <10=> NRF_CLOCK_LF_ACCURACY_2_PPM 
// <11=> NRF_CLOCK_LF_ACCURACY_1_PPM 

#ifndef NRF_SDH_CLOCK_LF_ACCURACY
#define NRF_SDH_CLOCK_LF_ACCURACY 1
#endif

Best regards,

Simon

RE: Can't find the bluetooth signal through the mobile phone

ticture — Sat, 20 Mar 2021 03:01:31 GMT

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?

RE: Can't find the bluetooth signal through the mobile phone

Simonr — Fri, 19 Mar 2021 06:34:24 GMT

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

RE: Can't find the bluetooth signal through the mobile phone

ticture — Thu, 18 Mar 2021 14:19:21 GMT

and could you please tell how to verify whether the ANT pin(pin 19) output the bluetooth signal.

RE: Can't find the bluetooth signal through the mobile phone

ticture — Thu, 18 Mar 2021 14:16:20 GMT

Thanks for your help! I am using "default" Bluetooth settings to search at first, however, when I change it into nRFConnect app for Android, I can't find my device either(the location sevices are enabled).

I have changed the HID example, and it runs well on DK, I can search the bluetooth signal, however, when I runs it on my boards, I can't search it anymore, so I think it is a HW issue.

the schematic of my board is on the left, and the official schematic is on the right.

RE: Can't find the bluetooth signal through the mobile phone

Simonr — Thu, 18 Mar 2021 13:56:21 GMT

Can you provide some more details regarding your mobile device. Are you using a mobile app for scanning for BLE devices or the "default" Bluetooth settings? I would suggest using our nRFConnect app for Android for scanning, and making sure that the location services are enabled on the app (no matter which one you're using really).

Have you made any other changes to the HID mouse example other than switching which LF crystal you're using. Are you using a custom board as well or one of our Development Kits? Iwould suggest making sure that your example runs on a DK before moving to a custom board, as that makes it easier to narrow down where the issue is (HW or SW).

Best regards,

Simon