does the arduino wire library use interrupts

Since we are using a RedBoard here, this example uses pin 2 to monitor for interrupts. Arduino also has more details on a handful of boards on their attachInterrupt() page. Some boards have more (like the Arduino Mega 2560) - refer to the user manual or datasheet for more information on what your specific board supports. Most Arduinos have 2 external interrupts built in: interrupt0 (on digital pin 2) and interrupt1 (on digital pin 3).

We'll attach an interrupt to pin 2 this pin will monitor a button that will send an 'On' signal to the LED when pressed and increment a counter. Now that we've got our hardware hooked up, let's look at a simple example that continuously sends an 'Off' signal to an LED. If this is your first time using Arduino, please review our tutorial on installing the Arduino IDE. Note: This example assumes you are using the latest version of the Arduino IDE on your desktop. mode) - Tells it what type of trigger to look for: a logic high, a logic low or a transition between the two.įor more information what pins are reserved for interrupts and some example code, check out Arduino's attachInterrupt() page. ISR) - The location of code we want to execute if this interrupt is triggered. The pin depends on the microcontroller being used. digitalPinToInterrupt(pin)) - Pin number of the interrupt, which tells the microprocessor which pin to monitor. language:cĪttachInterrupt(digitalPinToInterrupt(pin), ISR, mode)įirst Parameter (i.e. In Arduino, we use a function called attachInterrupt() to do this and the recommended syntax looks similar to the output below.

The programmer defines the code that is to be executed when a particular interrupt occurs within the program itself. When the event or interrupt happens, the processor takes immediate notice, saves its execution state, runs a small chunk of code (often called the interrupt handler or interrupt service routine), and then returns back to whatever it was doing before.

Does the arduino wire library use interrupts