STM32WL SUBGHZ Radio IRQ Lines

[RLind.3]

Hi there,

I have a small question about the Radio IRQ lines on the STM32WL series. As far as I am aware, there are two MCU interrupts tied to the SUBGHZ radio: the RFBUSY interrupt (EXTI45) and the SUBGHZ_Radio_IRQ (EXTI44). However, when setting up the radio, there is the option to configure 3 separate IRQ lines. What is the purpose of this if there is only one interrupt available on the MCU side?

Thanks,

Rebecca

[JKo · Accepted solution]

The STM32WL is based on the Semtech SX126x which has 3 separate DIO lines available for IRQs. Only the first DIO line is connected in the STM32WL but the SPi command to the sub-GHz radio doesn't change.