How to use all Physical Pins on the Arduino Due?

Official Hardware Mega Due
1

Hi!

I built a custom Board with the Sam3X8E Chip. Im using the direct Port manipulation since it is quite fast, also not all Physical Pins are mapped to the Arduino environement.

REG_PIOB_SODR = 0x1 << 27;
REG_PIOB_CODR = 0x1 << 27;

But how can I use the extended Pins with some Arduino functions like, for example, AttachInterrupt?

attachInterrupt(PIN_PIOB1 , readTacho1, RISING);

Of course it is not working since PIN_PIOB1 is not the correct name: Analog_Board.ino:33: error: 'PIN_PIOB1' was not declared in this scope

How can I use all the Pins within my sketches without changing the Arduino Pin mapping files?

Thanks!

2

Hello tsaG,

variant.h defines some pins that you can use directly with Arduino functions like LED pin 13 which is PIN_LED_13 or PIN_LED in variant.h (see lines 75 and 78). Thus, you can use this pin for example as follows:

void setup() {
  pinMode(PIN_LED, OUTPUT);
}

void loop() {
  digitalWrite(PIN_LED, HIGH);
  delay(1000);
  digitalWrite(PIN_LED, LOW);
  delay(1000);
}

If you want to use pin 53 (not defined in variant.h) You have to add in variant.h the following line

#define PIN_LED_53 (53u)

and now you can use pin 53 with Arduino function.

I hope this help. Best regards,

p