Program.cs

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System.Device.Spi;
using System.Device.Gpio;
using System.Device.Pwm.Drivers;
using System.IO;
using System.Device.Pwm;
using System;
using System.Threading;
using System.Threading.Tasks;
using System.Globalization;
using System.Drawing;
using Iot.Device.Display;
using Iot.Device.Ft4222;
using Iot.Device.CharacterLcd;
using Iot.Device.Graphics;
using Iot.Device.Graphics.SkiaSharpAdapter;

SkiaSharpAdapter.Register();
Console.WriteLine("Hello PCD8544, screen of Nokia 5110!");
Console.WriteLine("Please select the platform you want to use:");
Console.WriteLine("  1. Native device like a Raspberry Pi");
Console.WriteLine("  2. FT4222");
var platformChoice = Console.ReadKey();
Console.WriteLine();

if (platformChoice is not object or { KeyChar: not ('1' or '2') })
{
    Console.WriteLine("You have to choose a valid platform");
    return;
}

SpiConnectionSettings spiConnection = new(0, 1) { ClockFrequency = 5_000_000, Mode = SpiMode.Mode0, DataFlow = DataFlow.MsbFirst, ChipSelectLineActiveState = PinValue.Low };
Pcd8544 lcd;

int pwmPin = -1;
Console.WriteLine("Which pin/channel do you want to use for PWM? (use negative number for none)");
var pinChoice = Console.ReadLine();
try
{
    pwmPin = Convert.ToInt32(pinChoice);
}
catch
{
    Console.WriteLine("Can't convert the pin number, will assume you don't want to use PWM.");
}

int resetPin = -1;
Console.WriteLine("Which pin do you want to use for Reset? (use negative number for none)");
pinChoice = Console.ReadLine();
try
{
    resetPin = Convert.ToInt32(pinChoice);
}
catch
{
    Console.WriteLine("Can't convert the pin number, will assume you don't want to use Reset.");
}

int dataCommandPin = -1;
Console.WriteLine("Which pin do you want to use for Data Command?");
pinChoice = Console.ReadLine();
try
{
    dataCommandPin = Convert.ToInt32(pinChoice);
}
catch
{
}

if (dataCommandPin < 0)
{
    Console.WriteLine("Can't continue as Data Command pin has to be valid.");
    return;
}

GpioController? gpio = null;
if (platformChoice.KeyChar == '1')
{
    PwmChannel? pwmChannel = pwmPin >= 0 ? PwmChannel.Create(0, pwmPin) : null;
    SpiDevice spi = SpiDevice.Create(spiConnection);
    lcd = new(dataCommandPin, spi, resetPin, pwmChannel);
}
else
{
    gpio = new(new Ft4222Gpio());
    Ft4222Spi ft4222Spi = new(spiConnection);
    SoftwarePwmChannel? softPwm = pwmPin >= 0 ? new(pwmPin, 1000, usePrecisionTimer: true, controller: gpio, shouldDispose: false, dutyCycle: 0) : null;
    lcd = new(dataCommandPin, ft4222Spi, resetPin, softPwm, gpio, false);
}

if (lcd is not object)
{
    Console.WriteLine("Something went wrong, can't initialize PCD8544");
    return;
}

lcd.Enabled = true;
Console.WriteLine("Choose the demonstration you want to see:");
Console.WriteLine("  1. All");
Console.WriteLine("  2. Brightness, Contrast, Temperature, Bias");
Console.WriteLine("  3. Display text, change cursor position");
Console.WriteLine("  4. Display images, resize images");
Console.WriteLine("  5. Display lines, points, rectangles");
Console.WriteLine("  6. Use the LcdConsole and display texts");
var demoChoice = Console.ReadKey();
Console.WriteLine();

if (demoChoice is not object or { KeyChar: < '1' or > '6' })
{
    Console.WriteLine("You have to choose a demonstration");
    return;
}

switch (demoChoice.KeyChar)
{
    case '1':
        BrightnessContrastTemperatureBias();
        DisplayTextChangePositionBlink();
        DisplayingBitmap();
        DisplayLinesPointsRectabngles();
        LcdConsole();
        break;
    case '2':
        BrightnessContrastTemperatureBias();
        break;
    case '3':
        DisplayTextChangePositionBlink();
        break;
    case '4':
        DisplayingBitmap();
        break;
    case '5':
        DisplayLinesPointsRectabngles();
        break;
    case '6':
        LcdConsole();
        break;
}

void BrightnessContrastTemperatureBias()
{
    Console.WriteLine("Adjusting brightness from 0 to 1.0");
    for (int i = 0; i < 10; i++)
    {
        lcd.SetCursorPosition(0, 0);
        lcd.WriteLine("Test for brightness");
        lcd.Write($"{i * 10} %");
        lcd.BacklightBrightness = i / 10.0f;
        Thread.Sleep(1000);
    }

    lcd.Clear();
    Console.WriteLine("Reseting brightness to 0.2 (20%)");
    lcd.BacklightBrightness = 0.2f;

    Console.WriteLine("Adjusting contrast from 0 to 127");
    for (byte i = 0; i < 128; i++)
    {
        lcd.SetCursorPosition(0, 0);
        lcd.WriteLine("Test for contrast");
        lcd.Write($"{i}");
        lcd.Contrast = i;
        Thread.Sleep(100);
    }

    Console.WriteLine("Reseting contrast to recommended value 40");
    lcd.Contrast = 40;
    lcd.Clear();

    Console.WriteLine("Testing the 4 different temperature modes");
    lcd.WriteLine("Test temp 0");
    lcd.Temperature = Iot.Device.Display.Pcd8544Enums.ScreenTemperature.Coefficient0;
    Thread.Sleep(1500);
    lcd.WriteLine("Test temp 1");
    lcd.Temperature = Iot.Device.Display.Pcd8544Enums.ScreenTemperature.Coefficient1;
    Thread.Sleep(1500);
    lcd.WriteLine("Test temp 2");
    lcd.Temperature = Iot.Device.Display.Pcd8544Enums.ScreenTemperature.Coefficient2;
    Thread.Sleep(1500);
    lcd.WriteLine("Test temp 3");
    lcd.Temperature = Iot.Device.Display.Pcd8544Enums.ScreenTemperature.Coefficient3;
    Thread.Sleep(1500);
    lcd.Temperature = Iot.Device.Display.Pcd8544Enums.ScreenTemperature.Coefficient0;
    lcd.Clear();

    Console.WriteLine("Adjusting bias from 0 to 6");
    // Adjusting the bias
    for (byte i = 0; i < 7; i++)
    {
        // Adjusting the bias
        lcd.Bias = i;
        lcd.SetCursorPosition(0, 0);
        lcd.WriteLine("Adjusting bias");
        lcd.Write($"bias = {i}");
        Thread.Sleep(2000);
        lcd.Clear();
    }

    Console.WriteLine("Reseting bias to recommended value 4");
    lcd.Bias = 4;
}

void DisplayTextChangePositionBlink()
{
    Console.WriteLine("Display is on and will switch on and off");
    lcd.Write("Display is on and will switch on and off");
    for (int i = 0; i < 5; i++)
    {
        Thread.Sleep(1000);
        lcd.Enabled = !lcd.Enabled;
    }

    lcd.Enabled = true;
    lcd.Clear();

    Console.WriteLine("Displaying multi line with WriteLine");
    lcd.SetCursorPosition(0, 0);
    lcd.Write("First line");
    lcd.SetCursorPosition(0, 1);
    lcd.Write("Second one");
    lcd.SetCursorPosition(0, 2);
    lcd.Write("3rd");
    lcd.SetCursorPosition(0, 3);
    lcd.Write("Guess!");
    lcd.SetCursorPosition(0, 4);
    lcd.Write("One more...");
    lcd.SetCursorPosition(0, 5);
    lcd.Write("last line");
    Thread.Sleep(1500);

    Console.WriteLine("Inverting the color screen");
    // this will blink the screen
    for (int i = 0; i < 6; i++)
    {
        lcd.InvertedColors = !lcd.InvertedColors;
        Thread.Sleep(1000);
    }

    Console.WriteLine("Activating the cursor, writting numbers in a raw");
    lcd.Clear();
    lcd.SetCursorPosition(0, 0);
    lcd.UnderlineCursorVisible = true;
    for (int i = 0; i < 50; i++)
    {
        lcd.Write($"{i}");
        Thread.Sleep(500);
    }

    lcd.Clear();
    Console.WriteLine("Testing backspace to remove character");
    lcd.Write("Basckspace");
    for (int i = 0; i < 5; i++)
    {
        Thread.Sleep(2000);
        lcd.Write("\b");
    }

    Console.WriteLine("Displaying more text and moving the cursor around");
    lcd.Clear();
    lcd.Write("More text");
    Thread.Sleep(1500);
    lcd.SetCursorPosition(0, 0);
    Thread.Sleep(1500);
    lcd.SetCursorPosition(5, 0);
    Thread.Sleep(1500);
    lcd.SetCursorPosition(0, 5);
    Thread.Sleep(1500);
    lcd.UnderlineCursorVisible = false;

    Console.WriteLine("This will display a line of random bits");
    lcd.Clear();
    lcd.WriteLine("This will display a line of random characters");
    Thread.Sleep(1500);
    char[] textToSend = new char[lcd.Size.Height * lcd.Size.Width];
    var rand = new Random(123456);
    for (int i = 0; i < textToSend.Length; i++)
    {
        textToSend[i] = (char)rand.Next(0, 255);
    }

    lcd.Clear();
    lcd.SetCursorPosition(0, 0);
    lcd.Write(textToSend);
    Thread.Sleep(1000);
    lcd.Clear();
}

void DisplayingBitmap()
{
    Console.WriteLine("Displaying bitmap, text, resizing them");
    using BitmapImage bitmapMe = BitmapImage.CreateFromFile(Path.Combine("me.bmp"));
    using BitmapImage bitmapNokia = BitmapImage.CreateFromFile(Path.Combine("nokia_bw.bmp"));

    // Open a non bitmap and resize it
    BitmapImage bitmapLarge = BitmapImage.CreateFromFile(Path.Combine("nonbmp.jpg"));
    bitmapLarge = bitmapLarge.Resize(Pcd8544.PixelScreenSize);

    for (byte i = 0; i < 2; i++)
    {
        lcd.Clear();
        lcd.Write("    Bonjour     .NET IoT!");
        Thread.Sleep(2000);
        lcd.Clear();

        lcd.SetCursorPosition(0, 0);
        lcd.Write("This is me");
        Thread.Sleep(1000);
        // Shows the first bitmap
        lcd.DrawBitmap(bitmapMe);
        Thread.Sleep(1500);

        lcd.SetCursorPosition(0, 0);
        lcd.WriteLine("A nice");
        lcd.WriteLine("picture with");
        lcd.WriteLine("a heart");
        lcd.WriteLine("displayed");
        lcd.WriteLine("on the screen");
        Thread.Sleep(1000);
        // Shows the second bitmap
        lcd.DrawBitmap(bitmapNokia);
        Thread.Sleep(1500);
        lcd.SetCursorPosition(0, 0);
        lcd.WriteLine("Large picture");
        lcd.WriteLine("resized and");
        lcd.WriteLine("changed to");
        lcd.WriteLine("monochrome");
        Thread.Sleep(1000);
        // Shows the second bitmap
        lcd.DrawBitmap(bitmapLarge);
        Thread.Sleep(1500);
    }

    bitmapLarge.Dispose();
}

void DisplayLinesPointsRectabngles()
{
    Console.WriteLine("Drawing point, line and rectangles");
    lcd.DrawPoint(5, 5, true);
    lcd.DrawLine(0, 0, 15, 35, true);
    lcd.DrawRectangle(10, 30, 10, 20, true, true);
    lcd.DrawRectangle(12, 32, 6, 16, false, true);
    // You should not forget to refresh to draw everything
    lcd.Draw();
    Thread.Sleep(2000);
    lcd.Clear();
    Console.WriteLine("Drawing 4 points at the 4 edges");
    lcd.DrawPoint(0, 0, true);
    lcd.DrawPoint(Pcd8544.PixelScreenSize.Width - 1, 0, true);
    lcd.DrawPoint(Pcd8544.PixelScreenSize.Width - 1, Pcd8544.PixelScreenSize.Height - 1, true);
    lcd.DrawPoint(0, Pcd8544.PixelScreenSize.Height - 1, true);
    lcd.Draw();
    Thread.Sleep(2000);
    Console.WriteLine("Drawing a rectangle at 2 pixels from the edge");
    lcd.DrawRectangle(2, 2, Pcd8544.PixelScreenSize.Width - 4, Pcd8544.PixelScreenSize.Height - 4, true, false);
    lcd.Draw();
    Thread.Sleep(2000);
    lcd.Clear();
    Console.WriteLine("Drawing 2 diagonal lines");
    lcd.DrawLine(0, 0, Pcd8544.PixelScreenSize.Width - 1, Pcd8544.PixelScreenSize.Height - 1, true);
    lcd.DrawLine(0, Pcd8544.PixelScreenSize.Height - 1, Pcd8544.PixelScreenSize.Width - 1, 0, true);
    lcd.Draw();
    Thread.Sleep(2000);
}

void LcdConsole()
{
    LcdConsole console = new LcdConsole(lcd, string.Empty, false);
    console.LineFeedMode = LineWrapMode.Truncate;
    Console.WriteLine("Nowrap test:");
    console.Write("This is a long text that should not wrap and just extend beyond the display");
    console.WriteLine("This has CRLF\r\nin it and should \r\n wrap.");
    console.Write("This goes to the last line of the display");
    console.WriteLine("This isn't printed, because it's off the screen");
    Thread.Sleep(1500);
    Console.WriteLine("Autoscroll test:");
    console.LineFeedMode = LineWrapMode.Wrap;
    console.WriteLine();
    console.WriteLine("Now the display should move up.");
    console.WriteLine("And more up.");
    for (int i = 0; i < 20; i++)
    {
        console.WriteLine($"This is line {i + 1}/{20}, but longer than the screen but you really have to add a lot of text to make it big enough");
        Thread.Sleep(500);
    }

    console.LineFeedMode = LineWrapMode.Wrap;
    console.WriteLine("Same again, this time with full wrapping.");
    for (int i = 0; i < 20; i++)
    {
        console.Write($"This is string {i + 1}/{20} longer than the screen but you really have to add a lot of text to make it big enough");
        Thread.Sleep(500);
    }

    Thread.Sleep(1500);
    Console.WriteLine("Intelligent wrapping test");
    console.LineFeedMode = LineWrapMode.WordWrap;
    console.WriteLine("Now intelligent wrapping should wrap this long sentence at word borders and ommit spaces at the start of lines.");
    Console.WriteLine("Not wrappable test");
    Thread.Sleep(1500);
    console.WriteLine("NowThisIsOneSentenceInOneWordThatCannotBeWrappedButStillAppearAllOverUpToTheEnd");
    Thread.Sleep(1500);
    Console.WriteLine("Individual line test");
    console.Clear();
    console.LineFeedMode = LineWrapMode.Truncate;
    console.ReplaceLine(0, "This is all garbage that will be replaced");
    console.ReplaceLine(0, "Running clock test, press enter to continue");
    int left = console.Size.Width;
    Task? alertTask = null;
    // Let the current time move trought the display on line 1
    while (!Console.KeyAvailable)
    {
        DateTime now = DateTime.Now;
        String time = String.Format(CultureInfo.CurrentCulture, "{0}", now.ToLongTimeString());
        string printTime = time;
        if (left > 0)
        {
            printTime = new string(' ', left) + time;
        }
        else if (left < 0)
        {
            printTime = time.Substring(-left);
        }

        console.ReplaceLine(1, printTime);
        left--;
        // Each full minute, blink the display (but continue writing the time)
        if (now.Second == 0 && alertTask is null)
        {
            alertTask = console.BlinkDisplayAsync(3);
        }

        if (alertTask is object && alertTask.IsCompleted)
        {
            // Ensure we catch any exceptions (there shouldn't be any...)
            alertTask.Wait();
            alertTask = null;
        }

        Thread.Sleep(500);
        // Restart when the time string has left the display
        if (left < -time.Length)
        {
            left = console.Size.Width;
        }
    }

    alertTask?.Wait();
    Console.ReadKey();
    console.Dispose();
}

Console.WriteLine("Thank you for your attention!");
lcd.WriteLine("Thank you for your attention!");
Thread.Sleep(2000);
lcd.Dispose();
// In case we're using FT4222, gpio needs to be disposed after the screen
gpio?.Dispose();