mirror of
https://github.com/node-red/node-red-nodes.git
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143 lines
4.2 KiB
JavaScript
143 lines
4.2 KiB
JavaScript
/**
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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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//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("/usr/local/bin/gpio")) { // gpio command not installed
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throw "Info : Can't find Raspberry Pi wiringPi gpio 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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"LED1":"7",
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"LED2":"0",
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"LED3":"2",
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"LED4":"1",
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"LED5":"3",
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"LED6":"4",
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"LED7":"5",
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"LED8":"6"
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}
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var tablepin = {
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// WiringPi : Physical
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"0":"LED2",
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"1":"LED4",
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"2":"LED3",
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"3":"LED5",
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"4":"LED6",
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"5":"LED7",
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"6":"LED8",
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"7":"LED1"
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}
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var barpins = {
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"1":"128",
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"2":"129",
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"3":"133",
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"4":"135",
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"5":"143",
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"6":"159",
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"7":"191",
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"8":"255",
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}
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var meterpins = {
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"1":"128",
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"2":"1",
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"3":"4",
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"4":"2",
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"5":"8",
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"6":"16",
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"7":"32",
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"8":"64",
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}
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function PiLiter(n) {
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RED.nodes.createNode(this,n);
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this.pin = pintable[n.pin];
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this.pinv = n.pin;
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var node = this;
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//Set all pins to outputs
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for (var p = 0; p < 8; p++) {
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exec("gpio mode "+p+" out");
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}
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if (this.pinv === "bar") {
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node.on("input", function(msg) {
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var out = Number(msg.payload);
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if ((out >= 1)&&(out <= 8)) { exec("gpio wb "+barpins[out]); }
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else { exec("gpio wb 0"); }
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});
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}
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else if (this.pinv === "meter") {
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node.on("input", function(msg) {
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var out = Number(msg.payload);
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if ((out >= 1)&&(out <= 8)) { exec("gpio wb "+meterpins[out]); }
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else { exec("gpio wb 0"); }
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});
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}
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else if (this.pinv === "all") {
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node.on("input", function(msg) {
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var out = msg.payload;
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if ((out === 1)|(out === true)|(out === "1")|(out === "on")) {
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exec("gpio wb 255");
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}
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else { exec("gpio wb 0"); }
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});
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}
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else if (this.pinv === "pin") {
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node.on("input", function(msg) {
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if (typeof msg.payload === "object") {
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var out = Number(msg.payload.led);
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var l = msg.payload.state;
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if ((out >= 1)&&(out <= 8)) {
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exec("gpio write "+pintable["LED"+out]+" "+l);
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}
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else { node.warn("Not a valid object - see Info panel."); }
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}
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else { node.warn("Not a valid object - see Info panel."); }
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});
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}
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else {
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node.on("input", function(msg) {
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var out = Number(msg.payload);
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if ((out >= 0)&&(out <= 255)) {
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var val = 0;
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for (var i = 0; i < 8; i ++) {
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val += ((out & 0x01) << pintable["LED"+(i+1)]);
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out = out >> 1;
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}
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exec("gpio wb "+val);
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}
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else { node.warn("Invalid input - not between 0 and 255"); }
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});
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}
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node.on("close", function() {
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exec("gpio wb 0");
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});
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}
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RED.nodes.registerType("rpi-liter",PiLiter);
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}
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