using GHI.OSHW.Hardware;
using Microsoft.SPOT.Hardware;
using System;
using System.Threading;
 
public class FEZCerberusN18Display
{
    private Orientations currentOrientation;
    private byte[] byteArray = new byte[1];
    private OutputPort backlight;
    private OutputPort reset;
    private OutputPort rs;
    private SPI.Configuration config;
    private SPI spi;
 
    /// <summary>
    /// Constructs a new instance of the N18 display for the FEZ Cerberus.
    /// </summary>
    /// <param name="resetPin">The reset pin (Pin 3 on the socket)</param>
    /// <param name="backlightPin">The backlight pin (Pin 4 on the socket)</param>
    /// <param name="rsPin">The rs pin (Pin 5 on the socket)</param>
    /// <param name="chipSelectPin">The SPI chip select pin (Pin 6 on the socket)</param>
    /// <param name="spiModule">The SPI module</param>
    /// <param name="defaultOrientation">The default orientation of the display</param>
    public FEZCerberusN18Display(Cpu.Pin resetPin, Cpu.Pin backlightPin, Cpu.Pin rsPin, Cpu.Pin chipSelectPin, SPI.SPI_module spiModule, Orientations defaultOrientation = Orientations.Portrait)
    {
        this.backlight = new OutputPort(backlightPin, true);
        this.reset = new OutputPort(resetPin, false);
        this.rs = new OutputPort(rsPin, false);
        this.config = new SPI.Configuration(chipSelectPin, false, 0, 0, false, true, 12000, spiModule);
        this.spi = new SPI(this.config);
 
        this.reset.Write(false);
        Thread.Sleep(150);
        this.reset.Write(true);
 
        this.Orientation = defaultOrientation;
 
        this.ConfigureDisplay();
    }
 
    /// <summary>
    /// The possible orientations of the display.
    /// </summary>
    public enum Orientations
    {
        /// <summary>
        /// Portrait orientation (rotated 0 degrees).
        /// </summary>
        Portrait = 0,
        /// <summary>
        /// Landscape orientation (rotated 90 degrees clockwise).
        /// </summary>
        Landscape = 1,
        /// <summary>
        /// Portrait orientation (rotated 180 degrees).
        /// </summary>
        PortraitFlipped = 2,
        /// <summary>
        /// Landscape orientation (rotated 90 degrees counter-clockwise).
        /// </summary>
        LandscapeFlipped = 3
    }
 
    /// <summary>
    /// The current orientation of the display.
    /// </summary>
    public Orientations Orientation
    {
        get
        {
            return this.currentOrientation;
        }
        set
        {
            if (Util.SetSpecialDisplayConfig(this.config, Util.BPP_Type.BPP16_BGR_BE, (int)value, this.rs.Id))
                this.currentOrientation = value;
            else
                throw new ArgumentException();
        }
    }
 
    /// <summary>
    /// The current width of the display based on its orientation.
    /// </summary>
    public int Width
    {
        get
        {
            return (this.Orientation == Orientations.Portrait || this.Orientation == Orientations.PortraitFlipped) ? 128 : 160;
        }
    }
 
    /// <summary>
    /// The current height of the display based on its orientation.
    /// </summary>
    public int Height
    {
        get
        {
            return (this.Orientation == Orientations.Portrait || this.Orientation == Orientations.PortraitFlipped) ? 160 : 128;
        }
    }
 
    private void WriteCommand(byte command)
    {
        this.byteArray[0] = command;
        this.rs.Write(false);
        this.spi.Write(byteArray);
    }
 
    private void WriteData(byte data)
    {
        this.byteArray[0] = data;
        this.rs.Write(true);
        this.spi.Write(byteArray);
    }
 
    private void ConfigureDisplay()
    {
        this.WriteCommand(0x11);//Sleep exit 
        Thread.Sleep(120);
 
        //ST7735R Frame Rate
        this.WriteCommand(0xB1);
        this.WriteData(0x01); this.WriteData(0x2C); this.WriteData(0x2D);
        this.WriteCommand(0xB2);
        this.WriteData(0x01); this.WriteData(0x2C); this.WriteData(0x2D);
        this.WriteCommand(0xB3);
        this.WriteData(0x01); this.WriteData(0x2C); this.WriteData(0x2D);
        this.WriteData(0x01); this.WriteData(0x2C); this.WriteData(0x2D);
 
        this.WriteCommand(0xB4); //Column inversion 
        this.WriteData(0x07);
 
        //ST7735R Power Sequence
        this.WriteCommand(0xC0);
        this.WriteData(0xA2); this.WriteData(0x02); this.WriteData(0x84);
        this.WriteCommand(0xC1); this.WriteData(0xC5);
        this.WriteCommand(0xC2);
        this.WriteData(0x0A); this.WriteData(0x00);
        this.WriteCommand(0xC3);
        this.WriteData(0x8A); this.WriteData(0x2A);
        this.WriteCommand(0xC4);
        this.WriteData(0x8A); this.WriteData(0xEE);
 
        this.WriteCommand(0xC5); //VCOM 
        this.WriteData(0x0E);
 
        this.WriteCommand(0x36); //MX, MY, RGB mode 
        this.WriteData(0xC8);
 
        //ST7735R Gamma Sequence
        this.WriteCommand(0xe0);
        this.WriteData(0x0f); this.WriteData(0x1a);
        this.WriteData(0x0f); this.WriteData(0x18);
        this.WriteData(0x2f); this.WriteData(0x28);
        this.WriteData(0x20); this.WriteData(0x22);
        this.WriteData(0x1f); this.WriteData(0x1b);
        this.WriteData(0x23); this.WriteData(0x37); this.WriteData(0x00);
 
        this.WriteData(0x07);
        this.WriteData(0x02); this.WriteData(0x10);
        this.WriteCommand(0xe1);
        this.WriteData(0x0f); this.WriteData(0x1b);
        this.WriteData(0x0f); this.WriteData(0x17);
        this.WriteData(0x33); this.WriteData(0x2c);
        this.WriteData(0x29); this.WriteData(0x2e);
        this.WriteData(0x30); this.WriteData(0x30);
        this.WriteData(0x39); this.WriteData(0x3f);
        this.WriteData(0x00); this.WriteData(0x07);
        this.WriteData(0x03); this.WriteData(0x10);
 
        this.WriteCommand(0x2a);
        this.WriteData(0x00); this.WriteData(0x00);
        this.WriteData(0x00); this.WriteData(0x7f);
        this.WriteCommand(0x2b);
        this.WriteData(0x00); this.WriteData(0x00);
        this.WriteData(0x00); this.WriteData(0x9f);
 
        this.WriteCommand(0xF0); //Enable test command  
        this.WriteData(0x01);
        this.WriteCommand(0xF6); //Disable ram power save mode 
        this.WriteData(0x00);
 
        this.WriteCommand(0x3A); //65k mode 
        this.WriteData(0x05);
 
        this.WriteCommand(0x29);//Display on
    }
}