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

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/**
* Copyright 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.
**/
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 physical P1 pins to Gordon's Wiring-Pi Pins (as they should be V1/V2 tolerant)
var pintable = {
// Physical : WiringPi
"Amber LED":"0",
"Buzzer ":"1",
"Red LED":"2",
"Out E":"3",
"Out F":"4",
"Out G":"5",
"Out H":"6",
"Green LED":"7",
"In C":"10",
"In B":"11",
"In D":"12",
"In A":"13",
"Red Button":"14",
}
var tablepin = {
// WiringPi : Physical
"0":"Amber",
"1":"Buzzer",
"2":"Red",
"3":"E",
"4":"F",
"5":"G",
"6":"H",
"7":"Green",
"10":"C",
"11":"B",
"12":"D",
"13":"A",
"14":"R",
}
function PibrellaIn(n) {
RED.nodes.createNode(this,n);
this.buttonState = -1;
this.pin = pintable[n.pin];
var node = this;
if (node.pin) {
exec("gpio mode "+node.pin+" in", function(err,stdout,stderr) {
if (err) node.error(err);
else {
node._interval = setInterval( function() {
exec("gpio 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:"pibrella/"+tablepin[node.pin], payload:node.buttonState};
node.send(msg);
}
}
}
});
}, 200);
}
});
}
else {
node.error("Invalid GPIO pin: "+node.pin);
}
node.on("close", function() {
clearInterval(node._interval);
});
}
function PibrellaOut(n) {
RED.nodes.createNode(this,n);
this.pin = pintable[n.pin];
var node = this;
if (node.pin == "1") {
exec("gpio mode 1 pwm");
process.nextTick(function() {
exec("gpio pwm-ms");
node.on("input", function(msg) {
var out = Number(msg.payload);
if (out == 1) { // fixed buzz
exec("gpio pwm 1 511");
exec("gpio pwmc 100");
}
else if ((out >= 2) && (out <= 9999)) { // set buzz to a value
exec("gpio pwm 1 511");
exec("gpio pwmc "+out);
}
else { exec("gpio pwm 1 0"); } // turn it off
});
});
}
else if (node.pin) {
process.nextTick(function() {
exec("gpio 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("gpio 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("gpio mode "+node.pin+" in");
});
}
//exec("gpio mode 0 out",function(err,stdout,stderr) {
//if (err) {
//util.log('[36-rpi-gpio.js] Error: "gpio" command failed for some reason.');
//}
//exec("gpio mode 1 out");
//exec("gpio mode 2 out");
//exec("gpio mode 3 out");
//exec("gpio mode 4 out");
//exec("gpio mode 5 out");
//exec("gpio mode 6 out");
//exec("gpio mode 7 out");
//exec("gpio mode 10 in");
//exec("gpio mode 11 in");
//exec("gpio mode 12 in");
//exec("gpio mode 13 in");
//exec("gpio mode 14 in");
//});
RED.nodes.registerType("rpi-pibrella in",PibrellaIn);
RED.nodes.registerType("rpi-pibrella out",PibrellaOut);