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GrumpyOldPizza / ArduinoCore-stm32l0

Arduino Core for STM32L0
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Reason for no PIN_ATTR_EXTI on PA0 with LoRaWAN #168

Open gitMichael opened 3 years ago

gitMichael commented 3 years ago

What's the exact reason for that? Mentioned at:

Your declaration will not work, because some internal use prevents PIN_ATTR_EXTI on PA0 (so either your interrupt will work, or LoRaWAN, but not both).

Originally posted by @GrumpyOldPizza in https://github.com/GrumpyOldPizza/ArduinoCore-stm32l0/issues/103#issuecomment-529108501

GrumpyOldPizza commented 3 years ago

PA0 aliases with PC0. Latter one is used for SX1276. So PA0 cannot have a EXTI on it, because that one is taken by PC0.

PA0 is instead routed as RTC TAMP pin, so same functionality ... almost.

gitMichael commented 3 years ago

OK I see now. But I think you mean PB0 which is used for the SX1276 DIO2 IRQ input on the EXTI0 line (at least at cmwx1zzabz). Thanks.