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Add Hummingboard GPIO node
This commit is contained in:
Dave C-J
188
hardware/HummingboardGPIO/hb-gpio.js
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188
hardware/HummingboardGPIO/hb-gpio.js
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/**
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* Copyright 2014 IBM Corp.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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**/
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module.exports = function(RED) {
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"use strict";
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var exec = require('child_process').exec;
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var fs = require('fs');
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var gpioCommand = '/usr/local/bin/gpiohb';
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//if (!fs.existsSync("/dev/ttyAMA0")) { // unlikely if not on a Pi
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//throw "Info : Ignoring Raspberry Pi specific node.";
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//}
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if (!fs.existsSync(gpioCommand)) { // gpio command not installed
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throw "Info : Can't find "+gpioCommand+" command.";
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}
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// Map physical P1 pins to Gordon's Wiring-Pi Pins (as they should be V1/V2 tolerant)
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var pintable = {
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// Physical : WiringPi
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"11":"0",
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"12":"1",
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"13":"2",
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"15":"3",
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"16":"4",
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"18":"5",
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"22":"6",
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"7":"7",
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"3":"8",
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"5":"9",
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"24":"10",
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"26":"11",
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"19":"12",
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"21":"13",
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"23":"14",
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"8":"15",
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"10":"16",
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"27":"30",
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"28":"31",
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"29":"21",
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"31":"22",
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"32":"26",
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"33":"23",
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"35":"24",
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"36":"27",
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"37":"25",
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"38":"28",
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"40":"29"
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}
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var tablepin = {
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// WiringPi : Physical
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"0":"11",
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"1":"12",
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"2":"13",
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"3":"15",
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"4":"16",
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"5":"18",
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"6":"22",
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"7":"7",
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"8":"3",
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"9":"5",
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"10":"24",
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"11":"26",
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"12":"19",
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"13":"21",
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"14":"23",
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"15":"8",
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"16":"10",
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"30":"27",
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"31":"28",
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"21":"29",
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"22":"31",
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"26":"32",
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"23":"33",
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"24":"35",
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"27":"36",
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"25":"37",
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"28":"38",
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"29":"40"
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}
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function GPIOHBInNode(n) {
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RED.nodes.createNode(this,n);
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this.buttonState = -1;
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this.pin = pintable[n.pin];
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this.intype = n.intype;
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this.read = n.read || false;
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if (this.read) { this.buttonState = -2; }
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var node = this;
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var readit = function() {
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exec(gpioCommand+" read "+node.pin, function(err,stdout,stderr) {
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if (err) { node.error(err); }
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else {
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exec(gpioCommand+" wfi "+node.pin + " both", function(err,stdo,stde) {
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if (err) { node.error(err); }
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else { readit(); }
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});
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if (node.buttonState !== Number(stdout)) {
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var previousState = node.buttonState;
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node.buttonState = Number(stdout);
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if (previousState !== -1) {
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var msg = {topic:"pi/"+tablepin[node.pin], payload:(node.buttonState === 0 ? 0 : 1)};
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node.send(msg);
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}
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}
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}
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});
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}
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if (node.pin !== undefined) {
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exec(gpioCommand+" mode "+node.pin+" "+node.intype, function(err,stdout,stderr) {
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if (err) { node.error(err); }
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else {
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readit();
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}
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});
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}
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else {
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node.error("Invalid GPIO pin: "+node.pin);
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}
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node.on("close", function() {
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clearInterval(node._interval);
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exec(gpioCommand+" close "+node.pin);
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});
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}
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function GPIOHBOutNode(n) {
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RED.nodes.createNode(this,n);
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this.pin = pintable[n.pin];
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this.set = n.set || false;
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this.level = n.level || 0;
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this.out = n.out || "out";
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var node = this;
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(node.out === "pwm") ? (node.op = "pwm") : (node.op = "write");
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if (node.pin !== undefined) {
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exec(gpioCommand+" mode "+node.pin+" "+node.out, function(err,stdout,stderr) {
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if (err) { node.error(err); }
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else {
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if (node.set && (node.out === "out")) {
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exec(gpioCommand+" write "+node.pin+" "+node.level, function(err,stdout,stderr) {
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if (err) { node.error(err); }
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});
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}
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node.on("input", function(msg) {
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if (msg.payload === "true") { msg.payload = true; }
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if (msg.payload === "false") { msg.payload = false; }
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var out = Number(msg.payload);
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var limit = 1;
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if (node.out === "pwm") { limit = 1023; }
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if ((out >= 0) && (out <= limit)) {
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exec(gpioCommand+" "+node.op+" "+node.pin+" "+out, function(err,stdout,stderr) {
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if (err) { node.error(err); }
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});
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}
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else { node.warn("Invalid input: "+out); }
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});
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}
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});
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}
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else {
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node.error("Invalid GPIO pin: "+node.pin);
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}
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node.on("close", function() {
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exec(gpioCommand+" close "+node.pin);
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});
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}
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RED.nodes.registerType("hb-gpio in",GPIOHBInNode);
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RED.nodes.registerType("hb-gpio out",GPIOHBOutNode);
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}
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