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There's a well known and annoying issue around zephyr and shared irqs. I fully appreciate how complex a proper solution is, and the time it takes to get it right.
There is one small part, though, with stm32's existing work-around with shared irqs in the adc block.
Here's Good recent discussion on the topic.
The existing ADC_STM32_STHARED_IRQS code is quite limiting. You can either use adc blocks that have the same IRQn, or adc blocks that have unique IRQns.. but not both!
I'm wondering.. as an interim solution, can we make the ADC code a bit more robust?
I hope to provide a patch for comments in the near future.
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