nrf52805- BLE Broadcasting stopped in few samples

[mohit kumar]

we are using nrf52805 after in few devices sometimes BLE is not visible(stopped broadcasting) to the receiver.

Here are the observation on that faulty device:-

1. Device BLE input supply available

2. 1.2V available  on DEC4

3. But not getting any oscillation on DSO XC1 AND XC2. 

 

[Simonr]

Hi

Have you tried debugging to see what is going on in your application? Do just some nRF52805 designs act faulty like this, or do all your PCBs not work? A common issue if just some of them are faulty is that the HF crystal you have is soldered on 90 degrees the wrong way. This would also explain why you don't see any oscillation on XC1/2.

Best regards,

Simon

[mohit kumar]

Hi simon,

Can you please suggest how we can debug it through software,

and this BLE was working previously so possibly OSC is placed properly.

Regards

Mohit Kumar

[Simonr]

In order to debug a custom board, you will need the SWDIO and SWDCLK pins to be available and connect them either to a dedicated debugger device or an nRF52 DK for example that has an onboard debugger that's able to debug external boards as well. Below you can see how to connect an external device to a DK for debugging. You can also check out this thread for information on how to debug a device.

As the device was working previously, do you have any idea what might have caused it to stop working? Any HW changes, or uploading new SW to the board that might have caused it to stop operating correctly. If the board was working at some point my guess is that some other SW has been uploaded onto it that doesn't trig the HF crystal, or crashes before the HF crystal is started.

Best regards,

Simon