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37-rpi-piface.js
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37-rpi-piface.js
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/**
* Copyright 2013,2014 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
module.exports = function(RED) {
"use strict";
var util = require("util");
var exec = require('child_process').exec;
var fs = require('fs');
if (!fs.existsSync("/dev/ttyAMA0")) { // unlikely if not on a Pi
throw "Info : Ignoring Raspberry Pi specific node.";
}
if (!fs.existsSync("/usr/local/bin/gpio")) { // gpio command not installed
throw "Info : Can't find Raspberry Pi wiringPi gpio command.";
}
// Map names of pins to Gordon's gpio PiFace pin numbers
var pintable = {
// Physical : WiringPi
"Button S1":"200",
"Button S2":"201",
"Button S3":"202",
"Button S4":"203",
"Input 5":"204",
"Input 6":"205",
"Input 7":"206",
"Input 8":"207",
"Output0":"208",
"Output1":"209",
"Output2":"210",
"Output3":"211",
"Output4":"212",
"Output5":"213",
"Output6":"214",
"Output7":"215",
"LED 0 / Relay 0":"200",
"LED 1 / Relay 1":"201",
"LED 2":"202",
"LED 3":"203",
"LED 4":"204",
"LED 5":"205",
"LED 6":"206",
"LED 7":"207"
}
function PiFACEInNode(n) {
RED.nodes.createNode(this,n);
this.buttonState = -1;
this.npin = n.pin;
this.pin = pintable[n.pin];
this.intype = n.intype;
this.read = n.read || false;
if (this.read) { this.buttonState = -2; }
var node = this;
if (node.pin) {
exec("gpio -p mode "+node.pin+" "+node.intype, function(err,stdout,stderr) {
if (err) { node.error(err); }
else {
node._interval = setInterval( function() {
exec("gpio -p read "+node.pin, function(err,stdout,stderr) {
if (err) {
node.error(err);
node.status({fill:"red",shape:"ring",text:"error"});
}
else {
if (node.buttonState !== Number(stdout)) {
var previousState = node.buttonState;
node.buttonState = Number(stdout);
if (previousState !== -1) {
node.status({fill:"green",shape:"dot",text:node.buttonState.toString()});
var msg = {topic:"piface/"+node.npin, payload:node.buttonState};
node.send(msg);
}
}
}
});
}, 200);
}
});
}
else {
node.error("Invalid PiFACE pin: "+node.pin);
}
node.on("close", function() {
clearInterval(node._interval);
});
}
function PiFACEOutNode(n) {
RED.nodes.createNode(this,n);
this.pin = pintable[n.pin];
this.set = n.set;
this.level = n.level;
var node = this;
if (node.pin) {
if (node.set) {
exec("gpio -p write "+node.pin+" "+node.level, function(err,stdout,stderr) {
if (err) {
node.status({fill:"red",shape:"ring",text:"error"});
node.error(err);
}
else {
node.status({fill:"yellow",shape:"dot",text:node.level});
}
});
}
node.on("input", function(msg) {
if (msg.payload === "true") { msg.payload = true; }
if (msg.payload === "false") { msg.payload = false; }
var out = Number(msg.payload);
if ((out === 0)|(out === 1)) {
exec("gpio -p write "+node.pin+" "+out, function(err,stdout,stderr) {
if (err) {
node.status({fill:"red",shape:"ring",text:"error"});
node.error(err);
}
else {
node.status({fill:"green",shape:"dot",text:out.toString()});
}
});
}
else { node.warn("Invalid input - not 0 or 1"); }
});
}
else {
node.error("Invalid PiFACE pin: "+node.pin);
}
}
exec("gpio load spi",function(err,stdout,stderr) {
if (err) {
util.log('[37-rpi-piface.js] Error: "gpio load spi" command failed. Check device tree is disabled.');
}
RED.nodes.registerType("rpi-piface in",PiFACEInNode);
RED.nodes.registerType("rpi-piface out",PiFACEOutNode);
});
}