attachInterrupt(pin, handler, mode, [callback])

Detect changes on a digital input line

Note: This function is still undergoing development and debug.

Arguments

• pin: the BeagleBone pin identifier
• handler:
  • true: always call the callback upon interrupt event
  • string: evaluated upon interrupt, passed an object with 'value' having the state of the input pin and will call callback if evaluates to true
• mode: RISING, FALLING or CHANGE
• callback: called when handler returns true or other events

Return value

• true if successful
• false on failure

callback(x)

• x.pin: pin that generated event
• x.output: result of handler function
• x.value: input state of the pin generating the interrupt
• x.attached: handler successfully attached
• x.configured: interrupt handler previously configured

Example run restore

var b = require('bonescript');
var inputPin = 'P8_19';
b.pinMode(inputPin, b.INPUT);
b.attachInterrupt(inputPin, true, b.CHANGE, interruptCallback);
setTimeout(detach, 12000);

function interruptCallback(x) {
    console.log(JSON.stringify(x));
}

function detach() {
    b.detachInterrupt(inputPin);
    console.log('Interrupt detached');
}

Build and execute instructions

• Toggle the state of P8_19 within 12 seconds of starting script.

See also

Topics

• BeagleBone expansion headers
• Digital I/O

Related functions

• require
• pinMode
• detachInterrupt

Examples

• Bacon Cape