konsumer

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• Prototype & OOP

  @konsumer started

  • 6 comments
  • 2,800 views

  @Gordon replied
• Prototype & OOP

  in JavaScript • 9 years, 10 months

  

  As a complete sidenote, I have a lot of experience with native javascript apps. If you guys are interested, I'd be happy to work on a port of the app to a node-webkit standalone. The benefits would be native file access (save files with actual save-file dialog) and no need for chrome install. Is the chrome-only stuff pretty well separated?

• Prototype & OOP

  in JavaScript • 9 years, 10 months

  

  It was pretty obvious, once I read the docs. I just now had some time to play with it, and pulled it out of a drawer. No fault of the docs, I should have done this, right away. Very impressed. Super-easy to get started.

• Prototype & OOP

  in JavaScript • 9 years, 10 months

  

  Also, as a sidenote, maybe my light string is funny, but even the regular functional form doesn't seem to work right:

  SPI2.setup({baud:3200000, mosi:B15});
  SPI2.send4bit([255,0,0, 0,255,0, 0,0,255], 0b0001, 0b0011);
  

  It lights up the first LED in a single color or not at all, and that's it.

  This is probably related to baude, but maybe should be noted here.

  Update: I spoke too soon. I updated the firmware, and it worked like a charm.

  SPI2.setup({baud:3200000, mosi:B15});
  SPI2.send4bit([255,0,0, 0,255,0, 0,0,255], 1, 3);
  

  sets LEDs 1, 2, &3 to red, green, blue.

  Update 2: It seems my code works great after the update, in it's original form. here is the complete lib,if anybody is interested:

  /**
   * Simple WS2811 interface
   * @param {Number} interval (100) Milliseconds for update interval
   * @param {Number} len      (50) length of light-string
   * @param {Number} baud     (3200000) bauderate of SPI
   * @param {Pin} pin         (B15) data-pin
   */
  function WS2811(interval, len, baud, pin){
    var self = this;
    self.interval = interval ||100;
    self.len = len || 50;
    self.leds = new Uint8Array(self.len * 3);
    SPI2.setup({baud:baud || 3200000, mosi:pin || B15});
    
    self.reset();
    
    // update at interval to copy vals to pixel array
    self.interval = setInterval(function(){
      self.setArray(self.leds);
    }, self.interval);
  }
  
  /**
   * Set all pixels to black
   */
  WS2811.prototype.reset = function(){
    this.leds = this.leds.map(function(){ return 0; });
  };
  
  /**
   * Send array in pixel-friendly format
   * @param {Array} data the pixels in R,G,B,R,G,B,... format
   */
  WS2811.prototype.setArray = function(data){
    SPI2.send4bit(data, 1,3);
  };
  
  /**
   * Set a pixel to an RGB value
   * @param {Number} i     The pixel ID
   * @param {Array} color  An RGB color, 0-255, in array
   */
  WS2811.prototype.setRGB = function(i, color){
    this.leds[i*3    ] = color[0];
    this.leds[i*3 + 1] = color[1];
    this.leds[i*3 + 2] = color[2];
  };
  
  
  // USAGE
  
  var lights = new WS2811();
  
  // scroll all pixels through white colors
  function whiteScroll(){
    var pos = 0;
    setInterval(function(){
      pos++;
      for (var i=0; i<lights.leds.length; i+=3){
        var col = (Math.sin(i+pos*0.2)+1) * 127;
        lights.setRGB(i/3, [col,col,col]);
      }
    }, 100);
  }
  
  
  // blink red, green,blue for pixels 1,2,3 to tell us we are starting
  // then, run our sequence function
  lights.setRGB(0, [255,0,0]);
  lights.setRGB(1, [0,255,0]);
  lights.setRGB(2, [0,0,255]);
  setTimeout(function(){
    lights.reset();
    whiteScroll();
  }, 100);
  

• Prototype & OOP

  in JavaScript • 9 years, 10 months

  

  I am pretty used to Javascript OOP prototypical programming, but am brand new to Espruino & having some issues. I am making a WS2811 lib, to get my feet wet with Espruino.

  function WS2811(len, baud, pin){
    SPI2.setup({baud:baud, mosi:pin});
  }
  
  WS2811.prototype.send = function(data){
    SPI2.send4bit(data, 1, 3);
  };
  
  // usage
  
  var light = new WS2811(50, 3200000, B15);
  light.send([255,0,0, 0,255,0, 0,0,255]);
  

  I get this:

  ERROR: Constructor should be a function at line 1 col 6.

  If I change the constructor to another form:

  var WS2811 = function(len, baud, pin)
  

  I get:
  ERROR: Function not found! Skipping. at line 1 col 13

  What am I doing wrong?