What do I have to change if I want to use LSI instead of LSE with the BLE_p2pServer_ota example?

[ledi7]

Hello,

I would like to use the BLE_p2pServer_ota example with the STM32WBA55CG as a template for a project. Since I do not have an LSE available here, I would like to use the LSI. Which settings (defines) do I have to change?
If I use the LSI with 32,000kHz, the advertising works, but I cannot establish a connection.

[Tesla DeLorean]

Watch for LSI not running through power down, many STM32 only have LSE in the low power domain. Not sure if case here, but check RM

[STTwo-32]

Hello @ledi7 

Do you mean you have replaced LSE with LSI1 in all peripherals that uses LSE. If so, The LSI1 must not be used for the 2.4 GHz RADIO sleep timer.

Best Regards.

STTwo-32

[ledi7]

Hello @STTwo-32 ,

I use the HSE and for the 2.4GHz radio sleep timer i tried to use the LSE/1000. I actually wanted to save the costs for an external 32.768 kHz oscillator, but in the meantime, I have done some experiments over different temperature ranges and think that it will not work reliably without the external oscillator. 

[ledi7]

Sorry, I meant the HSE/1000, not the LSE/1000!

[STTwo-32 · Accepted solution]

For now, you need to have an external Oscillator.

Best Reagrds.

STTwo-32