C# - OLED 64x48 Bricklet

This is the description of the C# API bindings for the OLED 64x48 Bricklet. General information and technical specifications for the OLED 64x48 Bricklet are summarized in its hardware description.

An installation guide for the C# API bindings is part of their general description.

Examples

The example code below is Public Domain (CC0 1.0).

Hello World

Download (ExampleHelloWorld.cs)

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using System;
using Tinkerforge;

class Example
{
    private static string HOST = "localhost";
    private static int PORT = 4223;
    private static string UID = "XYZ"; // Change XYZ to the UID of your OLED 64x48 Bricklet

    static void Main()
    {
        IPConnection ipcon = new IPConnection(); // Create IP connection
        BrickletOLED64x48 oled = new BrickletOLED64x48(UID, ipcon); // Create device object

        ipcon.Connect(HOST, PORT); // Connect to brickd
        // Don't use device before ipcon is connected

        // Clear display
        oled.ClearDisplay();

        // Write "Hello World" starting from upper left corner of the screen
        oled.WriteLine(0, 0, "Hello World");

        Console.WriteLine("Press enter to exit");
        Console.ReadLine();
        ipcon.Disconnect();
    }
}

Pixel Matrix

Download (ExamplePixelMatrix.cs)

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using System;
using Tinkerforge;

class Example
{
    private static string HOST = "localhost";
    private static int PORT = 4223;
    private static string UID = "XYZ"; // Change XYZ to the UID of your OLED 64x48 Bricklet
    private static int WIDTH = 64;
    private static int HEIGHT = 48;

    private static void DrawMatrix(BrickletOLED64x48 oled, bool[][] pixels)
    {
        byte[][] pages = new byte[HEIGHT / 8][];

        for (int row = 0; row < HEIGHT / 8; row++)
        {
            pages[row] = new byte[WIDTH];

            for (int column = 0; column < WIDTH; column++)
            {
                pages[row][column] = 0;

                for (int bit = 0; bit < 8; bit++)
                {
                    if (pixels[(row * 8) + bit][column])
                    {
                        pages[row][column] |= (byte)(1 << bit);
                    }
                }
            }
        }

        oled.NewWindow(0, (byte)(WIDTH - 1), 0, (byte)(HEIGHT / 8 - 1));

        for (int row = 0; row < HEIGHT / 8; row++)
        {
            oled.Write(pages[row]);
        }
    }

    static void Main()
    {
        IPConnection ipcon = new IPConnection(); // Create IP connection
        BrickletOLED64x48 oled = new BrickletOLED64x48(UID, ipcon); // Create device object

        ipcon.Connect(HOST, PORT); // Connect to brickd
        // Don't use device before ipcon is connected

        // Clear display
        oled.ClearDisplay();

        // Draw checkerboard pattern
        bool[][] pixels = new bool[HEIGHT][];

        for (int row = 0; row < HEIGHT; row++)
        {
            pixels[row] = new bool[WIDTH];

            for (int column = 0; column < WIDTH; column++)
            {
                pixels[row][column] = (row / 8) % 2 == (column / 8) % 2;
            }
        }

        DrawMatrix(oled, pixels);

        Console.WriteLine("Press enter to exit");
        Console.ReadLine();
        ipcon.Disconnect();
    }
}

Scribble

Download (ExampleScribble.cs)

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using System;
using System.Drawing;
using System.Threading;
using Tinkerforge;

class Example
{
    private static string HOST = "localhost";
    private static int PORT = 4223;
    private static string UID = "XYZ"; // Change to your UID
    private static int WIDTH = 64;
    private static int HEIGHT = 48;

    private static void DrawBitmap(BrickletOLED64x48 oled, Bitmap bitmap)
    {
        byte[][] pages = new byte[HEIGHT / 8][];

        for (int row = 0; row < HEIGHT / 8; row++)
        {
            pages[row] = new byte[WIDTH];

            for (int column = 0; column < WIDTH; column++)
            {
                pages[row][column] = 0;

                for (int bit = 0; bit < 8; bit++)
                {
                    if (bitmap.GetPixel(column, (row * 8) + bit).GetBrightness() > 0)
                    {
                        pages[row][column] |= (byte)(1 << bit);
                    }
                }
            }
        }

        oled.NewWindow(0, (byte)(WIDTH - 1), 0, (byte)(HEIGHT / 8 - 1));

        for (int row = 0; row < HEIGHT / 8; row++)
        {
            oled.Write(pages[row]);
        }
    }

    static void Main()
    {
        IPConnection ipcon = new IPConnection(); // Create IP connection
        BrickletOLED64x48 oled = new BrickletOLED64x48(UID, ipcon); // Create device object

        ipcon.Connect(HOST, PORT); // Connect to brickd
        // Don't use device before ipcon is connected

        // Clear display
        oled.ClearDisplay();

        // Draw rotating line
        Bitmap bitmap = new Bitmap(WIDTH, HEIGHT);
        int originX = WIDTH / 2;
        int originY = HEIGHT / 2;
        int length = HEIGHT / 2 - 2;
        int angle = 0;

        Console.WriteLine("Press enter to exit");

        while (!Console.KeyAvailable)
        {
            double radians = Math.PI * angle / 180.0;
            int x = (int)(originX + length * Math.Cos(radians));
            int y = (int)(originY + length * Math.Sin(radians));

            using (Graphics g = Graphics.FromImage(bitmap))
            {
                g.FillRectangle(Brushes.Black, 0, 0, WIDTH, HEIGHT);
                g.DrawLine(Pens.White, originX, originY, x, y);
            }

            DrawBitmap(oled, bitmap);
            Thread.Sleep(25);

            angle++;
        }

        Console.ReadLine();
        ipcon.Disconnect();
    }
}

API

Generally, every method of the C# bindings that returns a value can throw a Tinkerforge.TimeoutException. This exception gets thrown if the device did not respond. If a cable based connection is used, it is unlikely that this exception gets thrown (assuming nobody plugs the device out). However, if a wireless connection is used, timeouts will occur if the distance to the device gets too big.

Since C# does not support multiple return values directly, we use the out keyword to return multiple values from a method.

The namespace for all Brick/Bricklet bindings and the IPConnection is Tinkerforge.*.

All methods listed below are thread-safe.

Basic Functions

public class BrickletOLED64x48(String uid, IPConnection ipcon)

Creates an object with the unique device ID uid:

BrickletOLED64x48 oled64x48 = new BrickletOLED64x48("YOUR_DEVICE_UID", ipcon);

This object can then be used after the IP Connection is connected (see examples above).

public void Write(byte[] data)

Appends 64 byte of data to the window as set by NewWindow().

Each row has a height of 8 pixels which corresponds to one byte of data.

Example: if you call NewWindow() with column from 0 to 63 and row from 0 to 5 (the whole display) each call of Write() (red arrow) will write one row.

Display pixel order

The LSB (D0) of each data byte is at the top and the MSB (D7) is at the bottom of the row.

The next call of Write() will write the second row and so on. To fill the whole display you need to call Write() 6 times.

public void NewWindow(byte columnFrom, byte columnTo, byte rowFrom, byte rowTo)

Sets the window in which you can write with Write(). One row has a height of 8 pixels.

The columns have a range of 0 to 63 and the rows have a range of 0 to 5.

public void ClearDisplay()

Clears the current content of the window as set by NewWindow().

public void WriteLine(byte line, byte position, string text)

Writes text to a specific line (0 to 5) with a specific position (0 to 12). The text can have a maximum of 13 characters.

For example: (1, 4, "Hello") will write Hello in the middle of the second line of the display.

You can draw to the display with Write() and then add text to it afterwards.

The display uses a special 5x7 pixel charset. You can view the characters of the charset in Brick Viewer.

Advanced Functions

public void SetDisplayConfiguration(byte contrast, bool invert)

Sets the configuration of the display.

You can set a contrast value from 0 to 255 and you can invert the color (black/white) of the display.

The default values are contrast 143 and inverting off.

public void GetDisplayConfiguration(out byte contrast, out bool invert)

Returns the configuration as set by SetDisplayConfiguration().

public byte[] GetAPIVersion()

Returns the version of the API definition (major, minor, revision) implemented by this API bindings. This is neither the release version of this API bindings nor does it tell you anything about the represented Brick or Bricklet.

public bool GetResponseExpected(byte functionId)

Returns the response expected flag for the function specified by the function ID parameter. It is true if the function is expected to send a response, false otherwise.

For getter functions this is enabled by default and cannot be disabled, because those functions will always send a response. For callback configuration functions it is enabled by default too, but can be disabled by SetResponseExpected(). For setter functions it is disabled by default and can be enabled.

Enabling the response expected flag for a setter function allows to detect timeouts and other error conditions calls of this setter as well. The device will then send a response for this purpose. If this flag is disabled for a setter function then no response is send and errors are silently ignored, because they cannot be detected.

See SetResponseExpected() for the list of function ID constants available for this function.

public void SetResponseExpected(byte functionId, bool responseExpected)

Changes the response expected flag of the function specified by the function ID parameter. This flag can only be changed for setter (default value: false) and callback configuration functions (default value: true). For getter functions it is always enabled.

Enabling the response expected flag for a setter function allows to detect timeouts and other error conditions calls of this setter as well. The device will then send a response for this purpose. If this flag is disabled for a setter function then no response is send and errors are silently ignored, because they cannot be detected.

The following function ID constants are available for this function:

  • BrickletOLED64x48.FUNCTION_WRITE = 1
  • BrickletOLED64x48.FUNCTION_NEW_WINDOW = 2
  • BrickletOLED64x48.FUNCTION_CLEAR_DISPLAY = 3
  • BrickletOLED64x48.FUNCTION_SET_DISPLAY_CONFIGURATION = 4
  • BrickletOLED64x48.FUNCTION_WRITE_LINE = 6
public void SetResponseExpectedAll(bool responseExpected)

Changes the response expected flag for all setter and callback configuration functions of this device at once.

public void GetIdentity(out string uid, out string connectedUid, out char position, out byte[] hardwareVersion, out byte[] firmwareVersion, out int deviceIdentifier)

Returns the UID, the UID where the Bricklet is connected to, the position, the hardware and firmware version as well as the device identifier.

The position can be 'a', 'b', 'c' or 'd'.

The device identifier numbers can be found here. There is also a constant for the device identifier of this Bricklet.

Constants

public int DEVICE_IDENTIFIER

This constant is used to identify a OLED 64x48 Bricklet.

The GetIdentity() function and the EnumerateCallback callback of the IP Connection have a deviceIdentifier parameter to specify the Brick's or Bricklet's type.

public string DEVICE_DISPLAY_NAME

This constant represents the human readable name of a OLED 64x48 Bricklet.