External interrupts

Detailed Description

Usage

1. Call attachInterrupt()

Example: Mass transport sensor

#include <Arduino.h>

// Change to whatever pin an LED is connected to
const int led = PC13;
// Declare variables that will be modified by interrupt handlers `volatile`
volatile int count = 0;

void countUp() {
  count++;
}

void setup() {
  Serial1.begin(115200);
  attachInterrupt(PA0, countUp, CHANGE);
}

void loop() {
  Serial1 << "Counted " << count << " particles.\n";
  delay(100);
}

Functions
void	attachInterrupt (uint8_t pinName, ISRType ISR, InterruptTrigger mode)
	Enable an interrupt with default priority. More...
void	detachInterrupt (uint8_t pinName)
	Disable an interrupt. More...
void	noInterrupts ()
	Disable external interrupts. More...
void	interrupts ()
	Enable external interrupts. More...

Function Documentation

void attachInterrupt	(	uint8_t	pinName,
		ISRType	ISR,
		InterruptTrigger	mode
	)

Enable an interrupt with default priority.

Note: There is only ONE EXTI per pinSource, i.e. PA0, PB0 cannot both have interrupts, but PA0 and PB1 can. Obviously, there can be a total of 16.

Parameters

pinName	Name of pin interrupt is connected to
ISR	Callback function to call when interrupt is triggered
mode	One of InterruptTrigger

void detachInterrupt

(

uint8_t

pinName

)

Disable an interrupt.

Parameters

pinName

Pin name where attachInterrupt() was called

void interrupts

(

)

Enable external interrupts.

Enabled by default

void noInterrupts

(

)

Disable external interrupts.

Note: This is unlike the Arduino function which disables ALL interrupts. That would stop the system clock here as well. Call NVIC_DisableIRQ() if you want the arduino behavior