mirror of https://github.com/node-red/node-red.git
144 lines
3.5 KiB
JavaScript
144 lines
3.5 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 util = require("util");
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var exec = require('child_process').exec;
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var fs = require('fs');
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if (!fs.existsSync("/usr/local/bin/gpio")) {
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exec("cat /proc/cpuinfo | grep BCM27",function(err,stdout,stderr) {
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if (stdout.indexOf('BCM27') > -1) {
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util.log('[36-rpi-gpio.js] Error: Cannot find Wiring-Pi "gpio" command');
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}
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// else not on a Pi so don't worry anyone with needless messages.
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});
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return;
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}
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// Map physical P1 pins to Gordon's Wiring-Pi Pins (as they should be V1/V2 tolerant)
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var pintable = {
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// Physical : WiringPi
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"7":"7",
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"11":"0",
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"12":"1",
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"13":"2",
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"15":"3",
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"16":"4",
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"18":"5",
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"22":"6"
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}
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var tablepin = {
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// WiringPi : Physical
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"7":"7",
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"0":"11",
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"1":"12",
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"2":"13",
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"3":"15",
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"4":"16",
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"5":"18",
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"6":"22"
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}
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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 = pintable[n.pin];
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this.intype = n.intype;
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var node = this;
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if (this.pin) {
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exec("gpio mode "+node.pin+" "+node.intype, function(err,stdout,stderr) {
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if (err) node.error(err);
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else {
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node._interval = setInterval( function() {
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exec("gpio read "+node.pin, function(err,stdout,stderr) {
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if (err) node.error(err);
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else {
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if (node.buttonState !== Number(stdout)) {
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var previousState = node.buttonState;
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node.buttonState = Number(stdout);
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if (previousState !== -1) {
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var msg = {topic:"pi/"+tablepin[node.pin], 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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}, 250);
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}
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});
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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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function GPIOOutNode(n) {
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RED.nodes.createNode(this,n);
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this.pin = pintable[n.pin];
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var node = this;
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if (this.pin) {
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process.nextTick(function() {
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exec("gpio mode "+node.pin+" out", function(err,stdout,stderr) {
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if (err) node.error(err);
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else {
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node.on("input", function(msg) {
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if (msg.payload === "true") msg.payload = true;
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if (msg.payload === "false") msg.payload = false;
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var out = Number(msg.payload);
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if ((out == 0)|(out == 1)) {
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exec("gpio write "+node.pin+" "+out, function(err,stdout,stderr) {
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if (err) node.error(err);
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});
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}
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else node.warn("Invalid input - not 0 or 1");
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});
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}
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});
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});
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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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exec("gpio mode 0 in",function(err,stdout,stderr) {
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if (err) {
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util.log('[36-rpi-gpio.js] Error: "gpio" command failed for some reason.');
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}
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exec("gpio mode 1 in");
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exec("gpio mode 2 in");
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exec("gpio mode 3 in");
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exec("gpio mode 4 in");
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exec("gpio mode 5 in");
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exec("gpio mode 6 in");
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exec("gpio mode 7 in",function(err,stdout,stderr) {
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RED.nodes.registerType("rpi-gpio in",GPIOInNode);
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RED.nodes.registerType("rpi-gpio out",GPIOOutNode);
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GPIOInNode.prototype.close = function() {
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clearInterval(this._interval);
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}
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GPIOOutNode.prototype.close = function() {
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exec("gpio mode "+this.pin+" in");
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}
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});
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});
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