Multi advertising non connectable and connectable are blocking CPU on nrf52840

[Catalin]

Hello,

In our project there is a problem that we encountered is happening when the Nordic BLE mesh advertising and connectable advertising for GATT connections are enabled in the same time. This problem is behaving by blocking the access to CPU for maximum of 15.3 ms, which is huge. As you can see in the attached images, these blocking issues are sporadic without having a period of happening. This is not happening if there only Nordic Mesh is available or only the GATT advertising is started. We are thinking of using the Radio timeslots but we suppose this will resolve only the transmission part since the reception is asynchronous from a third party device.  

      We are using the TIMER1 interrupt for toggling an GPIO (in project it used to have the clock on the line). The Softdevice used is S140 6.1.0 and nRF5 SDK v.15.0

 

   How can we handle this worst 15.3ms latency? Who needs so much CPU time?

Thank you,

 Catalin

[Catalin]

Hi,

   We manage to work around this delay but again we hit and we need to resolve this, since we updated to nRF Mesh 3.1 and SDK 15.3

Here are the interrupt priority registers. 

Timer1 has interrupt priority 1 and at each 415 us it toggles a pin. As you can see in the first message there are gaps that are around 15ms in toggling. 

 

The problem as we talked is due to coexistence of SDK BLE and Mesh in the situation that they are both advertising.

Thanks,

   Catalin