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digitalPinToInterrupt: fix double pin remapping #10373

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Sep 25, 2024
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digitalPinToInterrupt: fix double pin remapping #10373

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2 changes: 1 addition & 1 deletion cores/esp32/Arduino.h
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Original file line number Diff line number Diff line change
Expand Up @@ -142,7 +142,7 @@
#endif
#define EXTERNAL_NUM_INTERRUPTS NUM_DIGITAL_PINS // All GPIOs
#define analogInputToDigitalPin(p) (((p) < NUM_ANALOG_INPUTS) ? (analogChannelToDigitalPin(p)) : -1)
#define digitalPinToInterrupt(p) ((((uint8_t)digitalPinToGPIONumber(p)) < NUM_DIGITAL_PINS) ? digitalPinToGPIONumber(p) : NOT_AN_INTERRUPT)
#define digitalPinToInterrupt(p) ((((uint8_t)digitalPinToGPIONumber(p)) < NUM_DIGITAL_PINS) ? (p) : NOT_AN_INTERRUPT)
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did you want to do something like this?

int8_t digitalPinToInterrupt(int8_t p) { 
    const int8_t pin = digitalPinToGPIONumber(p);
    return pin < NUM_DIGITAL_PINS ? pin : NOT_AN_INTERRUPT;
}

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What you've written is the old behavior.
The current behavior has just become a simple check to see if it is a valid pin???
I don't see yet how this is better as it doesn't convert the value.

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@pillo79 pillo79 Sep 26, 2024 •
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@TD-er true, it does not. However the vast majority of uses of digitalPinToInterrupt are as an input to attachInterrupt, which does already remap the pin. So this patch allows to use either attachInterrupt(digitalPinToInterrupt(Dx)) or attachInterrupt(Dx), since remapping is applied once, only in the outer function.
See #10367 for more context 🙂

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Which begs the question, do attachInterrupt(digitalPinToInterrupt(Dx)) and attachInterrupt(Dx) yield the same result? (well they do now, but probably didn't with the older code)
So is this just an optimization or can it also break existing code?

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Either has always worked on all ESP32 targets; this was reported in the above issue as broken on the Arduino Nano ESP32, the only board that uses pin remapping; this PR fixed that issue restoring proper functionality everywhere.

#define digitalPinHasPWM(p) (((uint8_t)digitalPinToGPIONumber(p)) < NUM_DIGITAL_PINS)

typedef bool boolean;
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