104 lines
4.1 KiB
JavaScript
104 lines
4.1 KiB
JavaScript
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module.exports = function(RED) {
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"use strict";
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var util = require("util");
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var spawn = require('child_process').spawn;
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var fs = require('fs');
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var gpioCommand = __dirname+'/nrgpio.py';
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if (!fs.existsSync("/dev/ttyAMA0")) { // unlikely if not on a Pi
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//util.log("Info : Ignoring Raspberry Pi specific node.");
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throw "Info : Ignoring Raspberry Pi specific node.";
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}
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if (!fs.existsSync("/usr/share/doc/python-rpi.gpio")) {
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util.log("[rpi-gpio] Info : Can't find Pi RPi.GPIO python library.");
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throw "Warning : Can't find Pi RPi.GPIO python library.";
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}
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if ( !(1 & parseInt ((fs.statSync(gpioCommand).mode & parseInt ("777", 8)).toString (8)[0]) )) {
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util.log("[rpi-gpio] Error : "+gpioCommand+" needs to be executable.");
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throw "Error : " + gpioCommand + " must to be executable.";
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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.pinv = n.pin;
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this.dir = (n.dir ? 1 : 0) || 0;
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var node = this;
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if (this.pinv === "bar") {
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node.child = spawn(gpioCommand, ["byte",node.dir]);
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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)) { out = Math.pow(2, out) - 1; }
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else { out = 0; }
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if (node.child !== null) { node.child.stdin.write(out+"\n"); }
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else { node.warn("Command not running"); }
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});
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}
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else if (this.pinv === "meter") {
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node.child = spawn(gpioCommand, ["byte",node.dir]);
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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)) { out = Math.pow(2, (out-1)); }
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else { out = 0; }
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if (node.child !== null) { node.child.stdin.write(out+"\n"); }
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else { node.warn("Command not running"); }
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});
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}
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else if (this.pinv === "all") {
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node.child = spawn(gpioCommand, ["byte",node.dir]);
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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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out = 255;
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}
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else { out = 0; }
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if (node.child !== null) { node.child.stdin.write(out+"\n"); }
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else { node.warn("Command not running"); }
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});
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}
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else if (this.pinv === "pin") {
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node.child = spawn(gpioCommand, ["byte",node.dir]);
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var byte = 0;
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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 = Number(msg.payload.state);
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if ((out >= 1) && (out <= 8)) {
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out = (Math.pow(2, (out-1)));
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if (l === 0) { out = ~ out; }
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byte = byte & out & 255;
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console.log("NOW",byte);
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if (node.child !== null) { node.child.stdin.write(byte+"\n"); }
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else { node.warn("Command not running"); }
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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.child = spawn(gpioCommand, ["byte",node.dir]);
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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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if (node.child !== null) { node.child.stdin.write(out+"\n"); }
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else { node.warn("Command not running"); }
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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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if (node.child != null) {
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node.child.kill('SIGKILL');
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}
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if (RED.settings.verbose) { node.log("end"); }
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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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