Add Pi-LITEr specific node for Pi users

2025-03-01 10:37:43 +00:00 · 2014-07-25 10:07:23 +01:00
parent 76d05dc2cd
commit 2611853620
5 changed files with 442 additions and 0 deletions
--- a/hardware/PiLiter/39-rpi-piliter.js
+++ b/hardware/PiLiter/39-rpi-piliter.js
@@ -0,0 +1,142 @@
+/**
+ * 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');
+
+    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
+        "LED1":"7",
+        "LED2":"0",
+        "LED3":"2",
+        "LED4":"1",
+        "LED5":"3",
+        "LED6":"4",
+        "LED7":"5",
+        "LED8":"6"
+    }
+
+    var tablepin = {
+    // WiringPi : Physical
+        "0":"LED2",
+        "1":"LED4",
+        "2":"LED3",
+        "3":"LED5",
+        "4":"LED6",
+        "5":"LED7",
+        "6":"LED8",
+        "7":"LED1"
+    }
+
+    var barpins = {
+        "1":"128",
+        "2":"129",
+        "3":"133",
+        "4":"135",
+        "5":"143",
+        "6":"159",
+        "7":"191",
+        "8":"255",
+    }
+
+    var meterpins = {
+        "1":"128",
+        "2":"1",
+        "3":"4",
+        "4":"2",
+        "5":"8",
+        "6":"16",
+        "7":"32",
+        "8":"64",
+    }
+
+    function PiLiter(n) {
+        RED.nodes.createNode(this,n);
+        this.pin = pintable[n.pin];
+        this.pinv = n.pin;
+        var node = this;
+
+        //Set all pins to outputs
+        for (var p = 0; p < 8; p++) {
+            exec("gpio mode "+p+" out");
+        }
+        if (this.pinv === "bar") {
+            node.on("input", function(msg) {
+                var out = Number(msg.payload);
+                if ((out >= 1)&&(out <= 8)) { exec("gpio wb "+barpins[out]); }
+                else { exec("gpio wb 0"); }
+            });
+        }
+        else if (this.pinv === "meter") {
+            node.on("input", function(msg) {
+                var out = Number(msg.payload);
+                if ((out >= 1)&&(out <= 8)) { exec("gpio wb "+meterpins[out]); }
+                else { exec("gpio wb 0"); }
+            });
+        }
+        else if (this.pinv === "all") {
+            node.on("input", function(msg) {
+                var out = msg.payload;
+                if ((out === 1)|(out === true)|(out === "1")|(out === "on")) {
+                    exec("gpio wb 255");
+                }
+                else { exec("gpio wb 0"); }
+            });
+        }
+        else if (this.pinv === "pin") {
+            node.on("input", function(msg) {
+                if (typeof msg.payload === "object") {
+                    var out = Number(msg.payload.led);
+                    var l = msg.payload.state;
+                    if ((out >= 1)&&(out <= 8)) {
+                        exec("gpio write "+pintable["LED"+out]+" "+l);
+                    }
+                    else { node.warn("Not a valid object - see Info panel."); }
+                }
+                else { node.warn("Not a valid object - see Info panel."); }
+            });
+        }
+        else {
+            node.on("input", function(msg) {
+                var out = Number(msg.payload);
+                if ((out >= 0)&&(out <= 255)) {
+                    var val = 0;
+                    for (var i = 0; i < 8; i ++) {
+                        val += ((out & 0x01) << pintable["LED"+(i+1)]);
+                        out = out >> 1;
+                    }
+                    exec("gpio wb "+val);
+                }
+                else { node.warn("Invalid input - not between 0 and 255"); }
+            });
+        }
+        node.on("close", function() {
+            exec("gpio wb 0");
+        });
+    }
+    RED.nodes.registerType("rpi-liter",PiLiter);
+}