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node-red-nodes/hardware/Pi/37-rpi-piface.js

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/**
* Copyright 2013 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.
**/
var RED = require(process.env.NODE_RED_HOME+"/red/red");
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"
}
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var tablepin = {
// WiringPi : Physical
"200":"S1",
"201":"S2",
"202":"S3",
"203":"S4",
"204":"I5",
"205":"I6",
"206":"I7",
"207":"I8",
"208":"O0",
"209":"O1",
"210":"O2",
"211":"O3",
"212":"O4",
"213":"O5",
"214":"O6",
"215":"O7",
"200":"L0",
"201":"L1",
"202":"L2",
"203":"L3",
"204":"L4",
"205":"L5",
"206":"L6",
"207":"L7"
}
function PiFACEInNode(n) {
RED.nodes.createNode(this,n);
this.buttonState = -1;
this.pin = pintable[n.pin];
this.intype = n.intype;
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);
else {
if (node.buttonState !== Number(stdout)) {
var previousState = node.buttonState;
node.buttonState = Number(stdout);
if (previousState !== -1) {
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var msg = {topic:"piface/"+tablepin[node.pin], 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];
var node = this;
if (node.pin) {
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.error(err);
});
}
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 for some reason.');
}
RED.nodes.registerType("rpi-piface in",PiFACEInNode);
RED.nodes.registerType("rpi-piface out",PiFACEOutNode);
});