Pins allowed

[flowmeter]

Hello NIico,
i'm facing a strange case :
Interrupt pins : 2, 3, A0, A1
4 ISRs : just a variable changed to switch cases in loop.

pins 2, 3 , A1 are working well, and not A0...
Can't find why. Is there a hardware reason ?
Best

[NicoHood]

For which board?

[flowmeter]

Uno

For example with this sketch A0 and A1 alone are working

// libraries
#include <PinChangeInterrupt.h>
#include <PinChangeInterruptBoards.h>
#include <PinChangeInterruptPins.h>
#include <PinChangeInterruptSettings.h>

   // interrup pins
const byte CAS1 = 2; // switch to GND 
const byte CAS2 = 3; //  IR switch to GND
const byte CAS3 = A0; // ILS to GND
const byte CAS4 = A1; // switch to GND 

    
    // feedback if necessary
const byte LedP1 = 7; 
const byte LedP2 = 6;

    // Switcher
volatile byte ACTION = 60;

    // anti-bouncing
const byte Delai_sans_rebond = 100; // ms

  // visual feedback function if needed
void clignotte() {
  for (byte i=2; i>0; i--){
  digitalWrite(LedP1, HIGH);
  digitalWrite(LedP2, LOW);
  delay(200);
  digitalWrite(LedP1, LOW);
  digitalWrite(LedP2, HIGH);
  delay(200);
  } // Fin du for
  digitalWrite(LedP2, LOW);
} // fin de clignotte()


void setup() {
   //interrup calls
  attachInterrupt(digitalPinToPinChangeInterrupt(CAS1), digitalInterruptCAS1, FALLING);
  attachInterrupt(digitalPinToPinChangeInterrupt(CAS2), digitalInterruptCAS2, FALLING);
  attachPinChangeInterrupt(digitalPinToPinChangeInterrupt(CAS3), digitalInterruptCAS3, FALLING);
  attachPinChangeInterrupt(digitalPinToPinChangeInterrupt(CAS4), digitalInterruptCAS4, FALLING);  

    // Outputs setup
  pinMode(LedP1, OUTPUT);
  pinMode(LedP2, OUTPUT);
 
     // interrupts setup
  pinMode(CAS1, INPUT_PULLUP);
  pinMode(CAS2, INPUT_PULLUP);
  pinMode(CAS3, INPUT_PULLUP);
  pinMode(CAS4, INPUT_PULLUP);
  Serial.begin(9600);

    // check
    Serial.println("Set up check ");
    Serial.print("detected pin ");
    Serial.println(CAS1);
     Serial.print("detected pin ");
    Serial.println(CAS2);
     Serial.print("detected pin ");
    Serial.println(CAS3);
     Serial.print("detected pin ");
    Serial.println(CAS4);
    Serial.println("End of set up check ");
        
} // fin de setup

void loop() { 
 
  switch(ACTION)
  {
    case CAS1:
    Serial.print("detected pin ");
    Serial.println(CAS1);
    ACTION = 60; // resets Switcher
    break;
    
    case CAS2:
    Serial.print("detected pin ");
    Serial.println(CAS2);
     ACTION = 60; // resets Switcher
    break;

    case CAS3:
    Serial.print("detected pin ");
    Serial.println(CAS3);
     ACTION = 60; // resets Switcher
    break;

    case CAS4:
    Serial.print("detected pin ");
    Serial.println(CAS4);
     ACTION = 60; // resets Switcher
    break;

    default:
    // clignotte();
    break;
    
    
  } // fin de switch(Action)
} // fin de loop


 // ISRs
void digitalInterruptCAS1(){ 
  static u32 precedenteIT1 = millis();
  u32 _millis1 = millis();
  if ((_millis1 - precedenteIT1) >= Delai_sans_rebond)
  {
   ACTION = CAS1;
  }
  precedenteIT1 = _millis1;
}

void digitalInterruptCAS2(){ 
  static u32 precedenteIT2 = millis();
  u32 _millis2 = millis();
  if ((_millis2 - precedenteIT2) >= Delai_sans_rebond)
  {
   ACTION = CAS2;
  }
  precedenteIT2 = _millis2;
}

void digitalInterruptCAS3(){ 
  static u32 precedenteIT3 = millis();
  u32 _millis3 = millis();
  if ((_millis3 - precedenteIT3) >= Delai_sans_rebond)
  {
   ACTION = CAS3;
   }
  precedenteIT3 = _millis3;
}

void digitalInterruptCAS4(){ 
  static u32 precedenteIT4 = millis();
  u32 _millis4 = millis();
  if ((_millis4 - precedenteIT4) >= Delai_sans_rebond)
  {
   ACTION = CAS4;
  }
  precedenteIT4 = _millis4;
}

[flowmeter]

i reversed back to normal attach interrup pins 2 and 3 and all 4 pins work.

`void setup() {
//interrup calls

attachInterrupt(digitalPinToInterrupt(2), digitalInterruptCAS1, FALLING);
attachInterrupt(digitalPinToInterrupt(3), digitalInterruptCAS2, FALLING);
attachPinChangeInterrupt(digitalPinToPinChangeInterrupt(CAS3), digitalInterruptCAS3, FALLING);
attachPinChangeInterrupt(digitalPinToPinChangeInterrupt(CAS4), digitalInterruptCAS4, FALLING); `

[NicoHood]

You did not answer my question

[flowmeter]

Uno, first word of my answer.
Have a nice day, and thank you for this library.

[NicoHood]

Sorry, overlooked that.

I dont see any reason, why A0 should not work.
https://www.circuito.io/blog/arduino-uno-pinout/

It should be a normal PCINT as A1 also is. Did you find a solution?

[NicoHood]

Maybe the CAS3/4 definitions are causing problems. did you try to inline those?

[flowmeter]

I'm sorry, I switched problem (and observations) between 1st and 2nd message. I won't be able to find back my code corresponding to my first message.
The solution is written in the message marked as answer.
Best
Sorry for the trouble.