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

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

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

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;
};

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();

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

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 :)

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

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.

Thank you so much Gordon! I am so happy to see something come alive!

I used this:

var g = Graphics.createArrayBuffer(16,8,1); 

To get this result -

Is that what you were expecting?

Also, I'm giving a talk on the state of JavaScript and IoT at Node.js Interactive and at FluentConf next year and I'm showcasing the Pico along with other things!

I purchased this Small 1.2" 8x8 Ultra Bright Square White LED Matrix + Backpack.

I got it working with an Arduino to make sure everything is wired up correctly and it does work.

https://vine.co/v/eLx5pq7zAhK

I believe it uses the MAX7219 driver but can't get it to work. Adafruit uses I2C and the Espruino library uses SPI.

Is there any raw I2C code I can use to test it out. I've wired up the - + to GND and 5v, and C to B6 and D to B7.

I2C1.setup({scl:B6, sda:B7});

Thanks

I updated the firmware (I guess it doesn't matter which one because I'm not using wifi) and then flashed, saved, and ejected it. I then plugged it in to the plug, the red LED flashed for a short time and then the program kicked in about a second or two later. :)

Hmmm. This didn't work for me.

I tried plugging it in to a wall charger and doesn't work. However when I hit the connect button on the WebIDE the program starts...