STM32WB55 : how to know if EXTI comes from SWI ?

[Jean-Marc Chiappa]

Hello,

I have used to read EXTI.SWIER1 to know if interrupt comes from SWI or external. But it seems that WB55 doesn't allow to read anymore the SWIER1 register. The RM notices that reading SWIER1 returns always '0'.

So my question is : How to know the source of the interrupt ?

EXTI.PR1 indicates an interrupt is pending but it is not very discriminant.

[Pavel A.]

Just set a flag before raising the SWI in software, then check & clear it in the handler ?