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node-red-nodes/hardware/HummingboardGPIO/hb-gpio.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.
**/
module.exports = function(RED) {
"use strict";
var exec = require('child_process').exec;
var fs = require('fs');
var gpioCommand = '/usr/local/bin/gpiohb';
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//if (!fs.existsSync("/etc/init.d/armhwinfo")) { // unlikely if not on a Hummingboard
//throw "Info : Ignoring Hummingboard specific node.";
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//}
if (!fs.existsSync(gpioCommand)) { // gpio command not installed
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throw "Error : Can't find "+gpioCommand+" command for Hummingboard.";
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}
// 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 GPIOHBInNode(n) {
RED.nodes.createNode(this,n);
this.buttonState = -1;
this.pin = pintable[n.pin];
this.intype = n.intype;
this.read = n.read || false;
if (this.read) { this.buttonState = -2; }
var node = this;
var readit = function() {
exec(gpioCommand+" read "+node.pin, function(err,stdout,stderr) {
if (err) { node.error(err); }
else {
exec(gpioCommand+" wfi "+node.pin + " both", function(err,stdo,stde) {
if (err) { node.error(err); }
else { readit(); }
});
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 === 0 ? 0 : 1)};
node.send(msg);
}
}
}
});
}
if (node.pin !== undefined) {
exec(gpioCommand+" mode "+node.pin+" "+node.intype, function(err,stdout,stderr) {
if (err) { node.error(err); }
else {
readit();
}
});
}
else {
node.error("Invalid GPIO pin: "+node.pin);
}
node.on("close", function() {
clearInterval(node._interval);
exec(gpioCommand+" close "+node.pin);
});
}
function GPIOHBOutNode(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;
(node.out === "pwm") ? (node.op = "pwm") : (node.op = "write");
if (node.pin !== undefined) {
exec(gpioCommand+" mode "+node.pin+" "+node.out, function(err,stdout,stderr) {
if (err) { node.error(err); }
else {
if (node.set && (node.out === "out")) {
exec(gpioCommand+" write "+node.pin+" "+node.level, function(err,stdout,stderr) {
if (err) { node.error(err); }
});
}
node.on("input", function(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 = 1023; }
if ((out >= 0) && (out <= limit)) {
exec(gpioCommand+" "+node.op+" "+node.pin+" "+out, function(err,stdout,stderr) {
if (err) { node.error(err); }
});
}
else { node.warn("Invalid input: "+out); }
});
}
});
}
else {
node.error("Invalid GPIO pin: "+node.pin);
}
node.on("close", function() {
exec(gpioCommand+" close "+node.pin);
});
}
RED.nodes.registerType("hb-gpio in",GPIOHBInNode);
RED.nodes.registerType("hb-gpio out",GPIOHBOutNode);
}