135 lines
4.3 KiB
JavaScript
135 lines
4.3 KiB
JavaScript
/**
|
|
* 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("/usr/local/bin/gpio")) {
|
|
exec("cat /proc/cpuinfo | grep BCM27",function(err,stdout,stderr) {
|
|
if (stdout.indexOf('BCM27') > -1) {
|
|
util.log('[37-rpi-piface.js] Error: Cannot find Wiring-Pi "gpio" command');
|
|
}
|
|
// else not on a Pi so don't worry anyone with needless messages.
|
|
});
|
|
return;
|
|
}
|
|
|
|
// 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.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) {
|
|
var msg = {topic:"pi/"+node.pin, payload:node.buttonState};
|
|
node.send(msg);
|
|
}
|
|
}
|
|
}
|
|
});
|
|
}, 250);
|
|
}
|
|
});
|
|
}
|
|
else {
|
|
node.error("Invalid PiFACE pin: "+node.pin);
|
|
}
|
|
}
|
|
|
|
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.');
|
|
}
|
|
exec("gpio -p reset",function(err,stdout,stderr) {
|
|
if (err) {
|
|
util.log('[37-rpi-piface.js] Error: "gpio -p reset" command failed for some reason.');
|
|
}
|
|
RED.nodes.registerType("rpi-piface in",PiFACEInNode);
|
|
RED.nodes.registerType("rpi-piface out",PiFACEOutNode);
|
|
PiFACEInNode.prototype.close = function() {
|
|
clearInterval(this._interval);
|
|
}
|
|
PiFACEOutNode.prototype.close = function() {
|
|
}
|
|
});
|
|
});
|