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• Adafruit 8x8 LED Backpacks

  @chalkers started

  • 20 comments
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  @pedesen replied
• Adafruit 8x8 LED Backpacks

  in Interfacing • 8 years, 6 months

  

  The module uses a similar API to what the arduino library had for the backpack. It uses the graphics API in the module :)

• Adafruit 8x8 LED Backpacks

  in Interfacing • 8 years, 6 months

  

  Hey Kylir

  I created an NPM module...you can check it out here:
  https://www.npmjs.com/package/espruino-adafruit-led-backpack

  Feel free to contribute additional functionality via GitHub :)

  But I have the basics of drawing implemented :)

  Regards
  Andrew

• Adafruit 8x8 LED Backpacks

  in Interfacing • 9 years, 1 month

  

  @Gordon How do I go about contributing modules to the Espruino project?

• Adafruit 8x8 LED Backpacks

  in Interfacing • 9 years, 1 month

  

  I created a git repo with tests and this is the function we got to get it working:

  module.exports = function rotate(value) {
      var rotated = value >> 1;
      // Check to see if the first bit was set...
      if (1 & value) {
      	//...flip the furthest bit on.
      	rotated += (1 << 7);
      }
      return rotated;
  };
  

• Adafruit 8x8 LED Backpacks

  in Interfacing • 9 years, 1 month

  

  Thanks for getting me this far!

  return (a>>1)||(a<<7); 
  

  This rotated the pixels correctly except for one last issue...

  I can draw a line, I can set a pixel anywhere in the grid.

  If the left most x is on 0 and it doesn't share the row with another pixel it will show up. If it does share with another pixel, it switches off.

  g.clear();
  //face top
  g.setPixel(2,0);
  g.setPixel(3,0);
  g.setPixel(4,0);
  g.setPixel(5,0);
  g.setPixel(1,1);
  g.setPixel(6,1);
  
  //face left
  g.setPixel(0,2);
  g.setPixel(0,3); // Won't show because of eyes on 2 and 5.
  g.setPixel(0,4);
  g.setPixel(0,5);
  
  //eyes
  g.setPixel(2,3);
  g.setPixel(5,3);
  
  //face right
  //g.setPixel(7,2);
  //g.setPixel(7,3);
  //g.setPixel(7,4);
  //g.setPixel(7,5);
  
  //face bottom
  g.setPixel(2,7);
  g.setPixel(3,7);
  g.setPixel(4,7);
  g.setPixel(5,7);
  g.setPixel(1,6);
  g.setPixel(6,6);
  
  g.flip();
  

  

  If I comment out the eyes the left most pixel will show:

  
  g.clear();
  //face top
  g.setPixel(2,0);
  g.setPixel(3,0);
  g.setPixel(4,0);
  g.setPixel(5,0);
  g.setPixel(1,1);
  g.setPixel(6,1);
  
  //face left
  g.setPixel(0,2);
  g.setPixel(0,3); // Won't show because of eyes on 2 and 5.
  g.setPixel(0,4);
  g.setPixel(0,5);
  
  
  //eyes
  //g.setPixel(2,3);
  //g.setPixel(5,3);
  
  //face right
  //g.setPixel(7,2);
  //g.setPixel(7,3);
  //g.setPixel(7,4);
  //g.setPixel(7,5);
  
  //face bottom
  g.setPixel(2,7);
  g.setPixel(3,7);
  g.setPixel(4,7);
  g.setPixel(5,7);
  g.setPixel(1,6);
  g.setPixel(6,6);
  
  g.flip();
  

  

• Adafruit 8x8 LED Backpacks

  in Interfacing • 9 years, 1 month

  

  So do I have to do a bit wise operation on the buffer?

• Adafruit 8x8 LED Backpacks

  in Interfacing • 9 years, 1 month

  

  PaintYourDragon from adafruit said this on Twitter:

  It's wired that way for routing reasons; need to ROL or ROR (forget
  which).

  https://twitter.com/paintyourdragon/status/663086330834907136

  I don't understand what that means :)

• Adafruit 8x8 LED Backpacks

  in Interfacing • 9 years, 1 month

  

  It seems 0,0 starts at 0,1 or 1,0.

• Adafruit 8x8 LED Backpacks

  in Interfacing • 9 years, 1 month

  

  The horse shoe looking one was I2C1.writeTo(0x70, 0, g.buffer);

  I2C1.writeTo(0x70, 1, g.buffer); and I2C1.writeTo(0x70, 7, g.buffer); were off.

  I2C1.writeTo(0x70, 2, g.buffer); and I2C1.writeTo(0x70, 14, g.buffer); created the L shape.