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node-red-nodes/hardware/Pibrella/38-rpi-pibrella.js

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module.exports = function(RED) {
"use strict";
var util = require("util");
var spawn = require('child_process').spawn;
var fs = require('fs');
var gpioCommand = __dirname+'/nrgpio';
if (!fs.existsSync("/dev/ttyAMA0")) { // unlikely if not on a Pi
//util.log("Info : Ignoring Raspberry Pibrella specific node.");
throw "Info : Ignoring Raspberry Pibrella specific node.";
}
if (!fs.existsSync("/usr/share/doc/python-rpi.gpio")) {
util.log("[rpi-pibrella] Info : Can't find RPi.GPIO python library.");
throw "Warning : Can't find RPi.GPIO python library.";
}
if ( !(1 & parseInt ((fs.statSync(gpioCommand).mode & parseInt ("777", 8)).toString (8)[0]) )) {
util.log("[rpi-pibrella] Error : "+gpioCommand+" needs to be executable.");
throw "Error : " + gpioCommand + " must to be executable.";
}
var pinsInUse = {};
var pinTypes = {"out":"digital output", "tri":"input", "up":"input with pull up", "down":"input with pull down", "pwm":"PWM output"};
var pintable = {
// Name : Pin
"Amber LED":"11",
"Buzzer ":"12",
"Red LED":"13",
"Out E":"15",
"Out F":"16",
"Out G":"18",
"Out H":"22",
"Green LED":"7",
"In D":"19",
"In A":"21",
"In B":"26",
"In C":"24",
"Red Button":"23"
}
var tablepin = {
// Pin : Name
"11":"Amber",
"12":"Buzzer",
"13":"Red",
"15":"E",
"16":"F",
"18":"G",
"22":"H",
"7":"Green",
"19":"D",
"21":"A",
"26":"B",
"24":"C",
"23":"R"
}
function PibrellaIn(n) {
RED.nodes.createNode(this,n);
this.buttonState = -1;
this.pin = pintable[n.pin];
this.read = n.read || false;
if (this.read) { this.buttonState = -2; }
var node = this;
if (!pinsInUse.hasOwnProperty(this.pin)) {
pinsInUse[this.pin] = "tri";
}
else {
if ((pinsInUse[this.pin] !== "tri")||(pinsInUse[this.pin] === "pwm")) {
node.error("GPIO pin "+this.pin+" already set as "+pinTypes[pinsInUse[this.pin]]);
}
}
if (node.pin !== undefined) {
node.child = spawn(gpioCommand, ["in",node.pin,"down",35]);
node.running = true;
node.status({fill:"green",shape:"dot",text:"OK"});
node.child.stdout.on('data', function (data) {
data = data.toString().trim();
if (data.length > 0) {
if (node.buttonState !== -1) {
node.send({ topic:"pibrella/"+tablepin[node.pin], payload:Number(data) });
}
node.buttonState = data;
node.status({fill:"green",shape:"dot",text:data});
if (RED.settings.verbose) { node.log("out: "+data+" :"); }
}
});
node.child.stderr.on('data', function (data) {
if (RED.settings.verbose) { node.log("err: "+data+" :"); }
});
node.child.on('close', function (code) {
if (RED.settings.verbose) { node.log("ret: "+code+" :"); }
node.child = null;
node.running = false;
node.status({fill:"red",shape:"circle",text:""});
});
node.child.on('error', function (err) {
if (err.errno === "ENOENT") { node.warn('Command not found'); }
else if (err.errno === "EACCES") { node.warn('Command not executable'); }
else { node.log('error: ' + err); }
});
}
else {
node.error("Invalid GPIO pin: "+node.pin);
}
node.on("close", function() {
if (node.child != null) {
node.child.stdin.write(" close "+node.pin);
node.child.kill('SIGKILL');
}
node.status({fill:"red",shape:"circle",text:""});
delete pinsInUse[node.pin];
if (RED.settings.verbose) { node.log("end"); }
});
}
RED.nodes.registerType("rpi-pibrella in",PibrellaIn);
function PibrellaOut(n) {
RED.nodes.createNode(this,n);
this.pin = pintable[n.pin];
this.set = n.set || false;
this.level = n.level || 0;
this.out = n.out || "out";
var node = this;
if (!pinsInUse.hasOwnProperty(this.pin)) {
pinsInUse[this.pin] = this.out;
}
else {
if ((pinsInUse[this.pin] !== this.out)||(pinsInUse[this.pin] === "pwm")) {
node.error("GPIO pin "+this.pin+" already set as "+pinTypes[pinsInUse[this.pin]]);
}
}
function inputlistener(msg) {
if (msg.payload === "true") { msg.payload = true; }
if (msg.payload === "false") { msg.payload = false; }
var out = Number(msg.payload);
var limit = 1;
if (node.out === "pwm") { limit = 100; }
if (node.pin === "12") {
limit = 4096;
if (out === 1) { out = 262; }
}
if ((out >= 0) && (out <= limit)) {
if (RED.settings.verbose) { node.log("inp: "+msg.payload); }
if (node.child !== null) { node.child.stdin.write(out+"\n"); }
else { node.warn("Command not running"); }
node.status({fill:"green",shape:"dot",text:msg.payload});
}
else { node.warn("Invalid input: "+out); }
}
if (node.pin !== undefined) {
if (node.pin === "12") {
node.child = spawn(gpioCommand, ["buzz",node.pin]);
} else {
if (node.set && (node.out === "out")) {
node.child = spawn(gpioCommand, [node.out,node.pin,node.level]);
} else {
node.child = spawn(gpioCommand, [node.out,node.pin]);
}
}
node.running = true;
node.status({fill:"green",shape:"dot",text:"OK"});
node.on("input", inputlistener);
node.child.stdout.on('data', function (data) {
if (RED.settings.verbose) { node.log("out: "+data+" :"); }
});
node.child.stderr.on('data', function (data) {
if (RED.settings.verbose) { node.log("err: "+data+" :"); }
});
node.child.on('close', function (code) {
if (RED.settings.verbose) { node.log("ret: "+code+" :"); }
node.child = null;
node.running = false;
node.status({fill:"red",shape:"circle",text:""});
});
node.child.on('error', function (err) {
if (err.errno === "ENOENT") { node.warn('Command not found'); }
else if (err.errno === "EACCES") { node.warn('Command not executable'); }
else { node.log('error: ' + err); }
});
}
else {
node.error("Invalid GPIO pin: "+node.pin);
}
node.on("close", function() {
if (node.child != null) {
node.child.stdin.write(" close "+node.pin);
node.child.kill('SIGKILL');
}
node.status({fill:"red",shape:"circle",text:""});
delete pinsInUse[node.pin];
if (RED.settings.verbose) { node.log("end"); }
});
}
RED.nodes.registerType("rpi-pibrella out",PibrellaOut);
RED.httpAdmin.get('/rpi-pibpins/:id',RED.auth.needsPermission('rpi-pibrella.read'),function(req,res) {
res.json(pinsInUse);
});
}