mirror of https://github.com/node-red/node-red.git
72 lines
2.2 KiB
JavaScript
72 lines
2.2 KiB
JavaScript
/**
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* Copyright 2013 IBM Corp.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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**/
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var RED = require("../../red/red");
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var gpio = require("pi-gpio");
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function GPIOInNode(n) {
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RED.nodes.createNode(this,n);
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this.buttonState = -1;
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this.pin = n.pin;
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this.resistor = n.resistor;
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var node = this;
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if (this.pin) {
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var setupPin = function(err) {
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if (err) {
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node.error(err);
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} else {
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node._interval = setInterval(function(){
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gpio.read(node.pin, function(err, value) {
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if(err){
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node.error(err);
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} else{
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if(node.buttonState !== value){
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var previousState = node.buttonState;
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node.buttonState = value;
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if (previousState !== -1) {
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var msg = {payload:node.buttonState};
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node.send(msg);
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}
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}
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}
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});
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}, 50);
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}
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};
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if (this.resistor == "no") {
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gpio.open(this.pin,"input",setupPin());
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} else {
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// Assume enabled externally via gpio-admin
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setupPin();
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}
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} else {
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this.error("Invalid GPIO pin: "+this.pin);
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}
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}
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RED.nodes.registerType("rpi-gpio in",GPIOInNode);
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GPIOInNode.prototype.close = function() {
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clearInterval(this._interval);
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if (this.resistor == "no") {
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gpio.close(this.pin);
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}
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}
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