3rd party board with nrf52833 - schematic

[simon1516]

Hi,

I use a 3rd party board from raytac (https://www.raytac.com/product/ins.php?index_id=95) on my PCB and I have problems with a bluetooth low energy connection. On your DK board the application works fine. Can I post questions in here or do I have to send an inquiry to raytac?

I have an bluetooth low energy application. I can connect by nRF connect successfully to the custom board, but the connection will be lost after 10-20s. Then I have to reconnect, the board is advertising furthermore.

Is there anything special I can check if there is an issue like this?

Thanks in advance

Simon

[awneil]

Obviously, if you have specific questions about Raytac's board, then Raytac are the people to answer them!

But the nRF52833 chip remains the same - it is no different because it's on a 3rd-party board!

Don't Raytac provide examples to tun on their board?

simon1516 said:

On your DK board the application works fine

Which suggests that it is something specific to the Raytac board - doesn't it?

Your first step should be to look carefully at the differences between the DK and the Raytac board

simon1516 said:

I can connect by nRF connect successfully to the custom board, but the connection will be lost after 10-20s.

So you need to debug your application to see where it's going wrong!

www.avrfreaks.net/.../2418156

Again, look for differences from the behaviour on the DK.

[simon1516]

awneil said:

Which suggests that it is something specific to the Raytac board - doesn't it?

Not exactly. Yes, Raytac provide examples, and I can flash and run them successfull to their DK board. I can also run my own application on the raytac DK board - it works fine.

I got problems when I try to run this application to my custom board - a board which includes the raytec BLE module. So the error is in the schematic of my designed PCB, which includes the raytac BLE module.

I attached the schematic we use. It´s just a raytac BLE module (which includes nrf52833) and a little bit peripheral such as a sensor and battery management. Maybe you can have a look at this? Otherwise it would be great if you can tell me, where I can get a doublecheck of this.

I also run and debug the application in SES. But there I only get the message "disconnected" (s. screenshot attached) after the connection is lost. Can I get more information about the disconnection?

Thanks for your help!

[awneil]

simon1516 said:

I only get the message "disconnected"

So expand that message to give you more information!

Set a breakpoint to see what's happening when that message is sent.

This is all standard debugging stuff

https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.nrf52832.ps.v1.1%2Fspis.html&cp=4_2_0_31_5&anchor=unique_631156952

https://www.argenox.com/library/bluetooth-low-energy/ultimate-guide-to-debugging-bluetooth-smart-ble-products/

And, again: www.avrfreaks.net/.../2418156