No BLE discovery on Android 7.0 and above

[Ketan Vaghela]

I have compiled ble_app_blinky sample code from nRF5_SDK_17.0.2_d674dde SDK and loaded it with s132_nrf52_7.2.0_softdevice.hex in my nrf52382 board. I can discover this device on < Anrodid version 7.0  mobile only. But When I load sample hex file into Thingy52 then I was able to discover in my all phone. Can I know what will be wrong in my hardware ?

[JONATHAN LL]

Hi Ketan,

Can you share your hex file you used to test?

To clarify:
You have a custom PCB with nrf52832 and that is the one that only connects to Android 7 ?

If so can you share the Hardware files and schematic?

Regards,
Jonathan

[Ketan Vaghela]

s132_nrf52_7.2.0_softdevice.hex8461.nrf52832_xxaa.hex

Hi Jonathan,

My board (custom pcb) connects to mobile device having android version below 7.0, however if I put same .hex in Thingy52, it connects to all devices. Not sure if it is hardware issue or some settings in software.

Here are .hex files and schematic snippet of nrf52832 used in custom board. Please let me know if you need any additional details. Thanks!

[JONATHAN LL]

Hi Ketan,
I tested the hex on a nrf52832 DK and it works on Android 10, so I believe it to be a HW problem.

looking over your schematic a coupled of thing to note. 

If you are using a QFN package like the QFAA
DEC2 pin 32, should not be connected. Leave it open

DEC3 pin 33, should be 100pF.
Looks like you have 0.1uF,

DC/DC components.
L2 (10uH) and L3 (15nH) + DEC4-VSS Capacitor (1.0uF)
Looks like you have 15uH instead on L3 and 0.1uF on the Cap.


Can you confirm that the component values that you had in in the schematic is the ones you used. If that is the case then try to update the component values to the recommended ones and see if that fixes the problem.   Here is a link to the nrf52832 QFAA DC/DC regulator setup. 

Additional questions,
You have connected both of the crystal oscillators? 

Regards,
Jonathan

[Ketan Vaghela]

Hi Jonathan,

Thanks for your swift reply, I tried changing values of component as you described but unfortunately that did not help resolving the issue. Please let me know if I should check any other area(s).

On your question about crystal oscillator- yes, Y1 - 32kHz and Y3 - 32MHz, both connected on board.

[JONATHAN LL]

Hi Ketan,

How many devices have you tested with? 

What devices where they? tablets, phones and pc?

Are you using the nrf connect app on the mobile devices?


To clarify:
Are you able to discover the the device and connect on android 7.   

Regards,
Jonathan