Factor neopixel out to a separate lib

CL: none

PUBLISHED_FROM=a15af497728917ae8fca675a1ebaf86062ce51a3

Author: dimonomid

.gitignore

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+lib

README.md

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+# Neopixel driver for Mongoose OS

mjs_fs/api_neopixel.js

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+load("api_bitbang.js");
+load("api_gpio.js");
+load("api_sys.js");
+
+let NeoPixel = {
+  RGB: 0,
+  GRB: 1,
+  BGR: 2,
+
+  // ## **`NeoPixel.create(pin, numPixels, order)`**
+  // Create and return a NeoPixel strip object. Example:
+  // ```javascript
+  // let pin = 5, numPixels = 16, colorOrder = NeoPixel.GRB;
+  // let strip = NeoPixel.create(pin, numPixels, colorOrder);
+  // strip.setPixel(0 /* pixel */, 12, 34, 56);
+  // strip.show();
+  //
+  // strip.clear();
+  // strip.setPixel(1 /* pixel */, 12, 34, 56);
+  // strip.show();
+  // ```
+  create: function(pin, numPixels, order) {
+    GPIO.set_mode(pin, GPIO.MODE_OUTPUT);
+    GPIO.write(pin, 0);  // Keep in reset.
+    let s = Object.create({
+      pin: pin,
+      len: numPixels * 3,
+      // Note: memory allocated here is currently not released.
+      // This should be ok for now, we don't expect strips to be re-created.
+      data: Sys.malloc(numPixels * 3),
+      order: order,
+      setPixel: NeoPixel.set,
+      clear: NeoPixel.clear,
+      show: NeoPixel.show,
+    });
+    s.clear();
+    return s;
+  },
+
+  // ## **`strip.setPixel(i, r, g, b)`**
+  // Set i-th's pixel's RGB value.
+  // Note that this only affects in-memory value of the pixel.
+  set: function(i, r, g, b) {
+    let v0, v1, v2;
+    if (this.order === NeoPixel.RGB) {
+      v0 = r; v1 = g; v2 = b;
+    } else if (this.order === NeoPixel.GRB) {
+      v0 = g; v1 = r; v2 = b;
+    } else if (this.order === NeoPixel.BGR) {
+      v0 = b; v1 = g; v2 = r;
+    } else {
+      return;
+    }
+    this.data[i * 3] = v0;
+    this.data[i * 3 + 1] = v1;
+    this.data[i * 3 + 2] = v2;
+  },
+
+  // ## **`strip.clear()`**
+  // Clear in-memory values of the pixels.
+  clear: function() {
+    for (let i = 0; i < this.len; i++) {
+      this.data[i] = 0;
+    }
+  },
+
+  // ## **`strip.show()`**
+  // Output values of the pixels.
+  show: function() {
+    GPIO.write(this.pin, 0);
+    Sys.usleep(60);
+    BitBang.write(this.pin, BitBang.DELAY_100NSEC, 3, 8, 8, 6, this.data, this.len);
+    GPIO.write(this.pin, 0);
+    Sys.usleep(60);
+    GPIO.write(this.pin, 1);
+  },
+};

mos.yml

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+author: mongoose-os
+type: lib
+description: Neopixel driver
+version: 1.0
+
+sources:
+  - src
+includes:
+  - include
+
+tags:
+  - js
+  - hw
+  - neopixel
+
+manifest_version: 2017-09-29

src/mgos_neopixel.c

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+/*
+ * Copyright (c) 2014-2018 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#include <stdbool.h>
+
+bool mgos_neopixel_init(void) {
+  return true;
+}