From c3b3957fbf520921db48a5652d4809793a832d6f Mon Sep 17 00:00:00 2001
From: Alexis Svinartchouk <alexis@resin.io>
Date: Wed, 26 Jun 2019 14:59:18 +0200
Subject: [PATCH] Led module prototype

Change-type: patch
---
 lib/gui/app/models/leds.ts | 70 ++++++++++++++++++++++++++++++++++++++
 npm-shrinkwrap.json        | 33 ++++++++++++++++++
 package.json               |  2 ++
 3 files changed, 105 insertions(+)
 create mode 100644 lib/gui/app/models/leds.ts

diff --git a/lib/gui/app/models/leds.ts b/lib/gui/app/models/leds.ts
new file mode 100644
index 00000000..72a9f19f
--- /dev/null
+++ b/lib/gui/app/models/leds.ts
@@ -0,0 +1,70 @@
+import { delay } from 'bluebird';
+import { Gpio } from 'pigpio';
+
+class Led {
+	private gpio: Gpio;
+
+	constructor(gpioNumber: number) {
+		this.gpio = new Gpio(gpioNumber, { mode: Gpio.OUTPUT });
+	}
+
+	public set intensity(value: number) {
+		// TODO: check that 0 <= value <= 1
+		this.gpio.pwmWrite(Math.round(value * 255));
+	}
+}
+
+export type Color = [number, number, number];
+export type AnimationFunction = (t: number) => Color;
+
+export class RGBLed {
+	private leds: [Led, Led, Led];
+	private currentAnimation?: AnimationFunction;
+	private static animations: Map<string, AnimationFunction> = new Map();
+
+	constructor(gpioNumbers: [number, number, number], public frequency = 60) {
+		this.leds = gpioNumbers.map(n => new Led(n)) as [Led, Led, Led];
+	}
+
+	private async loop() {
+		while (this.currentAnimation !== undefined) {
+			this.$setColor(...this.currentAnimation(new Date().getTime()));
+			await delay(1000 / this.frequency);
+		}
+	}
+
+	private $setColor(red: number, green: number, blue: number) {
+		this.leds[0].intensity = red;
+		this.leds[1].intensity = green;
+		this.leds[2].intensity = blue;
+	}
+
+	public setColor(red: number, green: number, blue: number) {
+		// stop any running animation
+		this.setAnimation();
+		this.$setColor(red, green, blue);
+	}
+
+	public static registerAnimation(name: string, animation: AnimationFunction) {
+		RGBLed.animations.set(name, animation);
+	}
+
+	public setAnimation(name?: string) {
+		const hadAnimation = this.currentAnimation !== undefined;
+		this.currentAnimation = name ? RGBLed.animations.get(name) : undefined;
+		// Don't launch the loop a second time
+		if (!hadAnimation) {
+			this.loop();
+		}
+	}
+}
+
+RGBLed.registerAnimation('breathe-white', (t: number) => {
+	const intensity = Math.sin(t / 1000);
+	return [intensity, intensity, intensity];
+});
+
+RGBLed.registerAnimation('blink-white', (t: number) => {
+	const intensity = Math.floor(t / 1000) % 2;
+	return [intensity, intensity, intensity];
+});
diff --git a/npm-shrinkwrap.json b/npm-shrinkwrap.json
index 5e3c1a0a..36368bf0 100644
--- a/npm-shrinkwrap.json
+++ b/npm-shrinkwrap.json
@@ -1085,6 +1085,15 @@
       "integrity": "sha1-qIc1gLOoS2msHmhzI7Ffu+uQR5o=",
       "dev": true
     },
+    "@types/pigpio": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/@types/pigpio/-/pigpio-1.2.1.tgz",
+      "integrity": "sha512-R0czS/QbWS/vU7rSp6MMcRu+zCZENcrYo/aDNDkF6RNSaKax6J+H45E9183AQtjJVb2N9VOCGrUfnHgyZ19WvQ==",
+      "dev": true,
+      "requires": {
+        "@types/node": "*"
+      }
+    },
     "@types/prettier": {
       "version": "1.16.4",
       "resolved": "https://registry.npmjs.org/@types/prettier/-/prettier-1.16.4.tgz",
@@ -9376,6 +9385,30 @@
       "resolved": "https://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
       "integrity": "sha1-7RQaasBDqEnqWISY59yosVMw6Qw="
     },
+    "pigpio": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/pigpio/-/pigpio-1.2.3.tgz",
+      "integrity": "sha512-3ySsqR2Dxvl8p/vY1MMwF6dVYXTNnK4uuGaYy7gQvQ65GIOtiqpU4N4Ylq1MoKJbfXY9SJbW2PLhkprzQks3dA==",
+      "requires": {
+        "bindings": "^1.5.0",
+        "nan": "^2.14.0"
+      },
+      "dependencies": {
+        "bindings": {
+          "version": "1.5.0",
+          "resolved": "https://registry.npmjs.org/bindings/-/bindings-1.5.0.tgz",
+          "integrity": "sha512-p2q/t/mhvuOj/UeLlV6566GD/guowlr0hHxClI0W9m7MWYkL1F0hLo+0Aexs9HSPCtR1SXQ0TD3MMKrXZajbiQ==",
+          "requires": {
+            "file-uri-to-path": "1.0.0"
+          }
+        },
+        "nan": {
+          "version": "2.14.0",
+          "resolved": "https://registry.npmjs.org/nan/-/nan-2.14.0.tgz",
+          "integrity": "sha512-INOFj37C7k3AfaNTtX8RhsTw7qRy7eLET14cROi9+5HAVbbHuIWUHEauBv5qT4Av2tWasiTY1Jw6puUNqRJXQg=="
+        }
+      }
+    },
     "pinkie": {
       "version": "2.0.4",
       "resolved": "https://registry.npmjs.org/pinkie/-/pinkie-2.0.4.tgz",
diff --git a/package.json b/package.json
index 5631b114..22f373d5 100644
--- a/package.json
+++ b/package.json
@@ -63,6 +63,7 @@
     "nan": "^2.9.2",
     "node-ipc": "^9.1.1",
     "path-is-inside": "^1.0.2",
+    "pigpio": "^1.2.3",
     "pretty-bytes": "^1.0.4",
     "prop-types": "^15.5.9",
     "react": "^16.8.5",
@@ -88,6 +89,7 @@
     "@babel/preset-react": "^7.0.0",
     "@types/debug": "^4.1.4",
     "@types/node": "^10.14.9",
+    "@types/pigpio": "^1.2.1",
     "@types/react-dom": "^16.8.4",
     "@types/request": "^2.48.1",
     "@types/tmp": "^0.1.0",