diff options
Diffstat (limited to 'dgbuilder/core_nodes/hardware/36-rpi-gpio.js')
| -rw-r--r-- | dgbuilder/core_nodes/hardware/36-rpi-gpio.js | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/dgbuilder/core_nodes/hardware/36-rpi-gpio.js b/dgbuilder/core_nodes/hardware/36-rpi-gpio.js new file mode 100644 index 00000000..93cbc4e0 --- /dev/null +++ b/dgbuilder/core_nodes/hardware/36-rpi-gpio.js @@ -0,0 +1,185 @@ +/** + * 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. + **/ + +module.exports = function(RED) { + "use strict"; + var util = require("util"); + var exec = require('child_process').exec; + var fs = require('fs'); + + var gpioCommand = '/usr/local/bin/gpio'; + + if (!fs.existsSync("/dev/ttyAMA0")) { // unlikely if not on a Pi + throw "Info : Ignoring Raspberry Pi specific node."; + } + + if (!fs.existsSync(gpioCommand)) { // gpio command not installed + throw "Info : Can't find Raspberry Pi wiringPi gpio command."; + } + + // Map physical P1 pins to Gordon's Wiring-Pi Pins (as they should be V1/V2 tolerant) + var pintable = { + // Physical : WiringPi + "11":"0", + "12":"1", + "13":"2", + "15":"3", + "16":"4", + "18":"5", + "22":"6", + "7":"7", + "3":"8", + "5":"9", + "24":"10", + "26":"11", + "19":"12", + "21":"13", + "23":"14", + "8":"15", + "10":"16", + "27":"30", + "28":"31", + "29":"21", + "31":"22", + "32":"26", + "33":"23", + "35":"24", + "36":"27", + "37":"25", + "38":"28", + "40":"29" + } + var tablepin = { + // WiringPi : Physical + "0":"11", + "1":"12", + "2":"13", + "3":"15", + "4":"16", + "5":"18", + "6":"22", + "7":"7", + "8":"3", + "9":"5", + "10":"24", + "11":"26", + "12":"19", + "13":"21", + "14":"23", + "15":"8", + "16":"10", + "30":"27", + "31":"28", + "21":"29", + "22":"31", + "26":"32", + "23":"33", + "24":"35", + "27":"36", + "25":"37", + "28":"38", + "29":"40" + } + + function GPIOInNode(n) { + RED.nodes.createNode(this,n); + this.buttonState = -1; + this.pin = pintable[n.pin]; + this.intype = n.intype; + var node = this; + + if (node.pin !== undefined) { + exec(gpioCommand+" mode "+node.pin+" "+node.intype, function(err,stdout,stderr) { + if (err) { node.error(err); } + else { + node._interval = setInterval( function() { + exec(gpioCommand+" 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/"+tablepin[node.pin], payload:node.buttonState}; + node.send(msg); + } + } + } + }); + }, 250); + } + }); + } + else { + node.error("Invalid GPIO pin: "+node.pin); + } + + node.on("close", function() { + clearInterval(node._interval); + }); + } + + function GPIOOutNode(n) { + RED.nodes.createNode(this,n); + this.pin = pintable[n.pin]; + var node = this; + + if (node.pin !== undefined) { + process.nextTick(function() { + exec(gpioCommand+" mode "+node.pin+" out", function(err,stdout,stderr) { + if (err) { node.error(err); } + else { + 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(gpioCommand+" 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 GPIO pin: "+node.pin); + } + + node.on("close", function() { + exec(gpioCommand+" mode "+node.pin+" in"); + }); + } + + var pitype = { type:"" }; + exec(gpioCommand+" -v | grep Type", function(err,stdout,stderr) { + if (err) { + util.log('[36-rpi-gpio.js] Error: "'+gpioCommand+' -v" command failed for some reason.'); + } + else { + pitype = { type:(stdout.split(","))[0].split(": ")[1], rev:(stdout.split(","))[1].split(": ")[1] }; + } + }); + + RED.nodes.registerType("rpi-gpio in",GPIOInNode); + RED.nodes.registerType("rpi-gpio out",GPIOOutNode); + + RED.httpAdmin.get('/rpi-gpio/:id',function(req,res) { + res.send( JSON.stringify(pitype) ); + }); +} |