Led module prototype

Change-type: patch

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];
+});

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",

package.json

@@ -36,6 +36,7 @@
   "license": "Apache-2.0",
   "platformSpecificDependencies": [
     "fsevents",
+    "pigpio",
     "winusb-driver-generator"
   ],
   "dependencies": {
@@ -63,6 +64,7 @@
     "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 +90,7 @@
     "@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",