First draft of neopixel

libs/neopixel/neopixel.ts

@@ -0,0 +1,88 @@
+namespace neopixel {
+
+    //% shim=sendBufferAsm
+    function sendBuffer(buf: Buffer, pin: DigitalPin) {
+    }
+
+    class Strip {
+        buf: Buffer;
+        pin: DigitalPin;
+        brightness: number;
+
+        length() {
+            return this.buf.length / 3
+        }
+
+        /**
+         * Set the brightness of the strip, 0-255.
+         */
+        setBrigthness(brightness: number): void {
+            this.brightness = brightness;
+        }
+
+        /**
+         * Set the pin where the neopixel is connected, defaults to P0.
+         */
+        setPin(pin: DigitalPin): void {
+            this.pin = pin;
+            pins.digitalWritePin(this.pin, 0)
+            basic.pause(50)
+        }
+
+        /**
+         * Turn off all LEDs.
+         */
+        clear(): void {
+            this.buf.fill(0);
+        }
+
+        /**
+         * Shift LEDs forward.
+         */
+        shift(off: number): void {
+            this.buf.shift(-off * 3)
+        }
+
+        /**
+         * Shift LEDs forward.
+         */
+        rotate(): void {
+            this.buf.rotate(-3)
+        }
+
+        display() {
+            basic.pause(1)
+            sendBuffer(this.buf, this.pin);
+        }
+
+        /**
+         * Set give LED to a given color (range 0-255 for r, g, b)
+         */
+        setPix(ledoff: number, r: number, g: number, b: number): void {
+            ledoff = ledoff * 3;
+            let br = this.brightness;
+            if (br < 255) {
+                r = (Math.clamp(0, 255, r) * br) >> 8;
+                g = (Math.clamp(0, 255, b) * br) >> 8;
+                b = (Math.clamp(0, 255, b) * br) >> 8;
+            }
+            let buf = this.buf;
+            buf[ledoff + 0] = Math.clamp(0, 255, g);
+            buf[ledoff + 1] = Math.clamp(0, 255, r);
+            buf[ledoff + 2] = Math.clamp(0, 255, b);
+        }
+    }
+
+    /**
+     * Create a new NeoPixel driver for `numleds` LEDs.
+     * @params numleds number of leds in the strip, eg: 24,30,60,64
+     */
+    export function create(numleds: number): Strip {
+        let strip = new Strip();
+        strip.buf = pins.createBuffer(numleds * 3);
+        strip.setBrigthness(255)
+        strip.setPin(DigitalPin.P0)
+        return strip;
+    }
+
+}