I can confirm WS2812 Controller still work with RC1 ;-)

TinyCLR OS
1

IMG_20210428_232719
IMG_20210428_2327194000Ă—3000 1.56 MB

Tested:

  • WS2812Controller with a
  • Load Image (8bpp BMP) from 16GB SD Card
  • FEZ Duino
  • WS2812B 32x8 Matrix with 5V 60A Power Supply

Very simple not optimized code:

        private static void RunTextDemo()
    {

        int rows = 8;
        int columns = 32;
        var signalPin = GpioController.GetDefault().OpenPin(SC20100.GpioPin.PA0);
        var sg = new DigitalSignal(signalPin);
        var leds = new WS2812Controller(sg, rows * columns);

        for (int i = 0; i < rows * columns; i++)
        {
            leds.SetColor(i, 0x00, 0x00, 0x00);
        }

        leds.Flush();

        var sd = StorageController.FromName(SC20100.StorageController.SdCard);
        var drive = FileSystem.Mount(sd.Hdc);
        using (System.IO.FileStream fileStream = new FileStream($@"{drive.Name}TinyCLR.bmp", FileMode.Open))
        {
            var image = Image.FromStream(fileStream);

            for (int col = 0; col < image.Width; col++)
            {
                for (int row = 0; row < image.Height; row++)
                {
                    Color c = image.GetPixel(col, row);
                    leds.SetColor(col * rows + (col % 2 != 0 ? rows - row - 1 : row), c.R, c.G, c.B);
                }
            }
        }
        leds.Flush();

    }

What is the better way to update the leds SetBuffer or SetColor ?
And how exactly does SetBuffer work ?

5 Likes
2

BMP on that simple LED? :slight_smile:

I would use the new BasicGraphics, which already includes simple fonts and shapes for you to easily use. Software Utility Drivers

Now your LEDs are inversed every other row (they go zigzag) and you need to invert those, which is 2 lines of code in TinyCLR. Look at swap endianess Encoding & Decoding your group size is 8 since there are 8 led in each line you want to swap!

@Greg_Norris can we actually add this sample to the new drivers section? :slight_smile: please!

1 Like
3

this is not the proper way. you need SC20100.Timer.DigitalSignal.Controller5.PA0

4

Hi Gus.

Some Background about this “project”.

I teach some kids how a TV is working.

Part 1: 3 LEDs To Demonstrate how Pixel work
Part 2: One RGB Led
Part 3: This LED Matrix.

The Kids can Draw Bitmaps on the PC with a very Simple Application and than they can display it on the LED Matrix. Because it’s cool :slight_smile:

5

Here is the driver you need

using GHIElectronics.TinyCLR.Devices.Gpio;
using GHIElectronics.TinyCLR.Devices.Signals;
using GHIElectronics.TinyCLR.Drivers.BasicGraphics;
using GHIElectronics.TinyCLR.Drivers.Worldsemi.WS2812;

namespace GHIElectronics.TinyCLR.Sample.LedMatrix
{

    class LedMatrix : BasicGraphics
    {
        private int row, column;
        WS2812Controller leds;
        public LedMatrix(GpioPin pin, int row, int column)
        {
            this.row = row;
            this.column = column;
            var sg = new SignalGenerator(pin);
            this.leds = new WS2812Controller(sg, this.row * this.column);
            
            Clear();
        }
        public override void Clear()
        {
            leds.Clear();
        }
        public override void SetPixel(int x, int y, uint color)
        {
            if (x < 0 || x >= this.column) return;
            if (y < 0 || y >= this.row) return;

            // even columns are inverted
            if((x & 0x01) !=0)
            {
                y = this.row -1 - y;
            }
            
            var index = x * this.row + y;

            leds.SetColor(index, (int) (color >> 16) & 0xff, (int)(color >> 8) & 0xff, (int)(color >> 0) & 0xff);
        }
        public void Flush()
        {
            leds.Flush();
        }
    }
}

And here is how to use

var pin = GpioController.GetDefault().OpenPin(SC20100.GpioPin.PC6);
var screen = new LedMatrix(pin, 8, 32);

screen.Clear();
var col = LedMatrix.ColorFromRgb(0, 20, 50);

var c = 0;
while (true)
{
    screen.Clear();
    screen.DrawString(c++.ToString(), col, 0, 0);
    screen.Flush();
    Thread.Sleep(10);

}
1 Like
6

That is great. Have you signed up for BrainPad insider? The Revolution of Micro-Micro Computing

1 Like