135 lines
4.6 KiB
JavaScript
135 lines
4.6 KiB
JavaScript
/**
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* Copyright 2013,2014 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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module.exports = function(RED) {
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"use strict";
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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("/dev/ttyAMA0")) { // unlikely if not on a Pi
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throw "Info : Ignoring Raspberry Pi specific node.";
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}
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if (!fs.existsSync("/usr/local/bin/gpio")) { // gpio command not installed
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throw "Info : Can't find Raspberry Pi wiringPi gpio command.";
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}
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// Map names of pins to Gordon's gpio PiFace pin numbers
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var pintable = {
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// Physical : WiringPi
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"Button S1":"200",
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"Button S2":"201",
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"Button S3":"202",
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"Button S4":"203",
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"Input 5":"204",
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"Input 6":"205",
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"Input 7":"206",
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"Input 8":"207",
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"Output0":"208",
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"Output1":"209",
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"Output2":"210",
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"Output3":"211",
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"Output4":"212",
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"Output5":"213",
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"Output6":"214",
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"Output7":"215",
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"LED 0 / Relay 0":"200",
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"LED 1 / Relay 1":"201",
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"LED 2":"202",
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"LED 3":"203",
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"LED 4":"204",
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"LED 5":"205",
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"LED 6":"206",
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"LED 7":"207"
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}
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function PiFACEInNode(n) {
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RED.nodes.createNode(this,n);
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this.buttonState = -1;
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this.npin = n.pin;
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this.pin = pintable[n.pin];
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this.intype = n.intype;
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this.read = n.read || false;
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if (this.read) { this.buttonState = -2; }
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var node = this;
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if (node.pin) {
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exec("gpio -p 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 -p 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:"piface/"+node.npin, 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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}, 200);
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}
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});
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}
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else {
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node.error("Invalid PiFACE pin: "+node.pin);
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}
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node.on("close", function() {
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clearInterval(node._interval);
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});
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}
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function PiFACEOutNode(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 (node.pin) {
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if (node.set) {
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exec("gpio -p write "+node.pin+" "+node.level, 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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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 -p 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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else {
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node.error("Invalid PiFACE pin: "+node.pin);
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}
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}
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exec("gpio load spi",function(err,stdout,stderr) {
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if (err) {
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util.log('[37-rpi-piface.js] Error: "gpio load spi" command failed for some reason.');
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}
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RED.nodes.registerType("rpi-piface in",PiFACEInNode);
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RED.nodes.registerType("rpi-piface out",PiFACEOutNode);
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});
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}
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