Arduino Uno code doesn´t work on Arduino Due

Official Hardware Mega Due
1

Hey Guys,

I never used an Arduino Due before so my knowledge about this specific board is basically zero.

I´ve copied some code for an Encoder from a blog post (Debounced Rotory Encoder – AZ-Delivery) and modified it slightly.

The code runs perfectly fine on my Arduino UNO and the LED Lights up every time I rotate the Encoder one notch but on my Arduino Due, which I need because I want to connect 6 Encoders in the end, the code just won´t work.
All wires are hooked up the same way on booth Arduinos.
I hope someone has an idea of what´s going wrong.

Here is my code:

#define encoderPinA 2
#define encoderPinB 3
#define SW 4

#define LED 8


volatile unsigned int encoderPos = 0; // a counter for the dial
unsigned int lastReportedPos = 1; // change management
static boolean rotating = false; // debounce management

int button = LOW;
int old_button = LOW;

// interrupt service routine variables
boolean A_set = false;
boolean B_set = false;


void setup()
{
  pinMode(encoderPinA, INPUT);
  pinMode(encoderPinB, INPUT);

  pinMode( SW, INPUT_PULLUP );

  pinMode(LED, OUTPUT);

  digitalWrite(encoderPinA, HIGH); // turn on pullup resistors
  digitalWrite(encoderPinB, HIGH); // turn on pullup resistors

  attachInterrupt(0, doEncoderA, CHANGE); // encoder pin on interrupt 0 (pin 2)
  attachInterrupt(1, doEncoderB, CHANGE); // encoder pin on interrupt 1 (pin 3)

/*
  Serial.begin(9600); // output to PC Serial Monitor
  delay(50);
  Serial.println("System Ready");
  delay(100);
*/

digitalWrite(LED, HIGH);
delay(100);
digitalWrite(LED, LOW);
}



void loop()
{
  digitalWrite(LED, LOW);
  //Serial.println("Entering Loop");
  //delay(50);
  rotating = true; // reset the debouncer

  if (lastReportedPos != encoderPos)
  {
    actionPosition();
    lastReportedPos = encoderPos;
  }


  button = !digitalRead( SW );

  if ( button != old_button )
  {
    actionButton();
    delay( 10 );
    old_button = button;
  }
  //Serial.println("Leaving Loop");
  //delay(50);
}


void actionButton()
{
  /*
  Serial.print("Button: ");
  delay(50);
  Serial.print ( button );
  delay(50);
  Serial.print (" | ");
  delay(50);
  Serial.println(encoderPos, DEC);
  delay(50);
  */
}


void actionPosition()
{
  /*
  Serial.print("Position: ");
  delay(50);
  Serial.print(encoderPos, DEC);
  delay(50);
  Serial.print (" | ");
  delay(50);
  Serial.println ( button );
  delay(50);
  */
  digitalWrite(LED, HIGH);
}

// ISR Interrupt on A changing state (Increment position counter)
void doEncoderA()
{
  if ( rotating ) delay (1); // wait a little until the bouncing is done
  if ( digitalRead(encoderPinA) != A_set ) // debounce once more
  {
    A_set = ! A_set;
    // adjust counter +1 if A leads B
    if ( A_set && ! B_set )
      encoderPos += 1;
    rotating = false; // no more debouncing until loop() hits again
  }
}


// ISR Interrupt on B changing state, same as A above
void doEncoderB()
{
  if ( rotating ) delay (1);
  if ( digitalRead(encoderPinB) != B_set )
  {
    B_set = ! B_set;
    //adjust counter -1 if B leads A
    if ( B_set && ! A_set )
      encoderPos -= 1;
    rotating = false;
  }
}

Edit:
It seems like the code gets stuck inside of the Interrupt.

2 
attachInterrupt(0, doEncoderA, CHANGE); // encoder pin on interrupt 0 (pin 2)
  attachInterrupt(1, doEncoderB, CHANGE); // encoder pin on interrupt 1 (pin 3)

Comments and code aren't coherent !

3

thank you, but how would this affect the functionality of the script?

4 
pinMode(encoderPinA, INPUT);
  pinMode(encoderPinB, INPUT);
5

ard_newbie:

pinMode(encoderPinA, INPUT);

pinMode(encoderPinB, INPUT);




I´m sorry I don´t understand.
It would be nice if you could explain it a litte bit more in depth.
6

I figured it out:
the Arduino Due isn´t able to execute delays inside of an Interrupt so it just won´t pass this line, removing it solved my problem