Ok, I think I understand, now, what @Scruffr meant by 'The same bit number … will share the same EXTI line’
Electron Pin C1 is [PC12] on the STM32, and RI_UC is [PB12]. I guess both being #12 means they share an EXTI line? I wish I’d known this when designing the board, as I could easily have chosen another GPIO pin! Sigh.
It would be useful if Particle updated/added this kind of detail to the Electron reference docs. I will post this feedback to Particle if I can work out how/where to that.
Cheers,
AT
Edt: Found this later; Linking for reference: Interrupts: #, priority, architecture
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