interrupt question

[clarkcbrawley]

Trying to test the attach interrupt function in the ArduinoIDE and on teensy3. This compiles and loads with the teensyduino beta6. I have a wire between 13 and 0 and I get no pulses counted in the ISR. The loop counts and runs, I see the pulse_train going 1 and 0 and the led is flashing. I assume I am doing something wrong. I use similar code in a breadboard with a Mega and count pulses from a pump and it works flawlessly. I am investigating moving this to a Teensy3 and wanted to investigate this function. I assume I am doing something wrong. Why do I get no ISR service?.

 

[manitou]

as forum rule at top states: Always post complete source code & details to reproduce any issue!
(use CODE tags (#) when posting code to retain indentation)

teensy3 pin interrupts are numbered by pin number like Arduino DUE
https://www.arduino.cc/reference/en/language/functions/external-interrupts/attachinterrupt/

here is a simple example using PWM to pulse pin 10 which is jumpered to pin 0

volatile uint32_t ticks;

void isr() {
  ticks++;
}

void setup() {
  analogWrite(10, 127);   // PWM pulse pin 10 jumpered to pin 0
  attachInterrupt(0, isr, CHANGE); // interrupt on change
  Serial.begin(9600);
}

void loop() {
  Serial.println(ticks);
  delay(1000);
}

 

[Chris O.]

The Teensy 3.x's pins default to "disabled" instead of "input" unlike the AVR chips in the (Arduino UNO, Mega).
In SETUP() add: pinMode(0, INPUT);

 

[manitou]

The Teensy 3.x's pins default to "disabled" instead of "input" unlike the AVR chips in the (Arduino UNO, Mega).
In SETUP() add: pinMode(0, INPUT);

Won't hurt, but Teensy attachInterrupt() was extended a few releases back to internally set pinMode to INPUT
https://forum.pjrc.com/threads/4055...ta-2-Available?p=126657&viewfull=1#post126657

 

[Chris O.]

Oh ok I didn't know this.
Thanks.

 

[Antonio]

my code (resumen)

const uint8_t pinHall = 23;   <---- pin 23 input external signal.
volatile bool hallState=false;

void setup() {
Serial.begin(921600);
hallState = 0;
pinMode(pinHall, INPUT_PULLDOWN);
attachInterrupt(digitalPinToInterrupt(pinHall), hallRising, FALLING);
}

void loop(){

while (!hallState)
     {
      Serial.print("Rising!!!\n");
      hallState = false;
      };
};


void hallRising() {
	hallState = true;
};

Good Luck!