rename "microbit" package to "core" #414 (#270)

* rename "microbit" package to "core" #414

* shouldn't edit the package id.

* updating package.json

* updated the wrong version

* missed updating pxt.json of tests

libs/core/led.ts

@@ -0,0 +1,139 @@
+/**
+ * Control of the LED screen.
+ */
+//% color=#5C2D91 weight=97
+    namespace led {
+
+    // what's the current high value
+    let barGraphHigh = 0;
+    // when was the current high value recorded
+    let barGraphHighLast = 0;
+
+    /**
+     * Displays a vertical bar graph based on the `value` and `high` value.
+     * If `high` is 0, the chart gets adjusted automatically.
+     * @param value current value to plot
+     * @param high maximum value. If 0, maximum value adjusted automatically, eg: 0
+     */
+    //% help=led/plot-bar-graph weight=20
+    //% blockId=device_plot_bar_graph block="plot bar graph of %value |up to %high" icon="\uf080" blockExternalInputs=true
+    //% parts="ledmatrix"
+    export function plotBarGraph(value: number, high: number): void {
+        let now = input.runningTime();
+        serial.writeString(value.toString() + "\r\n");
+        value = Math.abs(value);
+
+        if (high != 0) barGraphHigh = high;
+        else if (value > barGraphHigh || now - barGraphHighLast > 10000) {
+            barGraphHigh = value;
+            barGraphHighLast = now;
+        }
+
+        barGraphHigh = Math.max(barGraphHigh, 16);
+
+        let v = (value * 15) / barGraphHigh;
+        let k = 0;
+        for (let y = 4; y >= 0; --y) {
+            for (let x = 0; x < 3; ++x) {
+                if (k > v) {
+                    unplot(2 - x, y);
+                    unplot(2 + x, y);
+                } else {
+                    plot(2 - x, y);
+                    plot(2 + x, y);
+                }
+                ++k;
+            }
+        }
+    }
+
+    /**
+     * Toggles a particular pixel
+     * @param x TODO
+     * @param y TODO
+     */
+    //% help=led/toggle weight=77
+    //% blockId=device_led_toggle block="toggle|x %x|y %y" icon="\uf204" blockGap=8
+    //% parts="ledmatrix"
+    export function toggle(x: number, y: number): void {
+        if (led.point(x, y)) {
+            led.unplot(x, y);
+        } else {
+            led.plot(x, y);
+        }
+    }
+
+    /**
+     * Turns all LEDS on
+     */
+    //% help=led/plot-all
+    //% parts="ledmatrix"
+    export function plotAll(): void {
+        for (let i = 0; i < 5; i++) {
+            for (let j = 0; j < 5; j++) {
+                led.plot(i, j);
+            }
+        }
+    }
+
+    /**
+     * Inverts the current LED display
+     */
+    //% help=led/toggle-all
+    //% parts="ledmatrix"
+    export function toggleAll(): void {
+        for (let i = 0; i < 5; i++) {
+            for (let j = 0; j < 5; j++) {
+                led.toggle(i, j);
+            }
+        }
+    }
+
+    /**
+     * Fades in the screen display.
+     * @param ms TODO
+     */
+    //% help=led/fade-in
+    //% parts="ledmatrix"
+    export function fadeIn(ms: number = 700): void {
+        if (ms < 20) {
+            led.setBrightness(255);
+            return;
+        }
+        let dt = 50;
+        let brightness = led.brightness();
+        let start = input.runningTime();
+        let elapsed = 0;
+        while (elapsed < ms) {
+            led.setBrightness(brightness + ((255 - brightness) * elapsed) / ms);
+            basic.pause(dt);
+            elapsed = input.runningTime() - start;
+        }
+        led.setBrightness(255);
+    }
+
+    /**
+     * Fades out the screen brightness.
+     * @param ms TODO
+     */
+    //% help=led/fade-out
+    //% parts="ledmatrix"
+    export function fadeOut(ms: number = 700): void {
+        if (ms < 20) {
+            led.setBrightness(0);
+            return;
+        }
+        let brightness = led.brightness();
+        let dt = 50;
+        let start = input.runningTime();
+        let elapsed = 0;
+        while (elapsed < ms) {
+            led.setBrightness(brightness - (brightness * elapsed) / ms);
+            basic.pause(dt);
+            elapsed = input.runningTime() - start;
+        }
+        led.setBrightness(0);
+    }
+
+
+}