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Add NOT_AN_INTERRUPT define (#105)
Fix #104
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cores/rp2040/Arduino.h

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@@ -50,6 +50,7 @@ void detachInterrupt(pin_size_t pin);
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#define digitalPinToBitMask(pin) (1UL << (pin))
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#define digitalPinToTimer(pin) (0)
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#define digitalPinToInterrupt(pin) (pin)
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#define NOT_AN_INTERRUPT (-1)
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#define portOutputRegister(port) ((volatile uint32_t*) sio_hw->gpio_out)
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#define portInputRegister(port) ((volatile uint32_t*) sio_hw->gpio_in)
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#define portModeRegister(port) ((volatile uint32_t*) sio_hw->gpio_oe)

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