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pandacraft 2025-03-21 16:04:17 +01:00
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Software/CSharp/GrovePi/I2CDevices/RgbLcdDisplay.cs Normal file
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using System;
using Windows.Devices.I2c;
using GrovePi.Common;
namespace GrovePi.I2CDevices
{
public interface IRgbLcdDisplay
{
IRgbLcdDisplay SetBacklightRgb(byte red, byte green, byte blue);
IRgbLcdDisplay SetText(string text);
}
internal sealed class RgbLcdDisplay : IRgbLcdDisplay
{
private const byte RedCommandAddress = 4;
private const byte GreenCommandAddress = 3;
private const byte BlueCommandAddress = 2;
private const byte TextCommandAddress = 0x80;
private const byte ClearDisplayCommandAddress = 0x01;
private const byte DisplayOnCommandAddress = 0x08;
private const byte NoCursorCommandAddress = 0x04;
private const byte TwoLinesCommandAddress = 0x28;
private const byte SetCharacterCommandAddress = 0x40;
internal RgbLcdDisplay(I2cDevice rgbDevice, I2cDevice textDevice)
{
if (rgbDevice == null) throw new ArgumentNullException(nameof(rgbDevice));
if (textDevice == null) throw new ArgumentNullException(nameof(textDevice));
RgbDirectAccess = rgbDevice;
TextDirectAccess = textDevice;
}
internal I2cDevice RgbDirectAccess { get; }
internal I2cDevice TextDirectAccess { get; }
public IRgbLcdDisplay SetBacklightRgb(byte red, byte green, byte blue)
{
//TODO: Find out what these addresses are for , set const.
RgbDirectAccess.Write(new byte[] {0, 0});
RgbDirectAccess.Write(new byte[] {1, 0});
RgbDirectAccess.Write(new byte[] { DisplayOnCommandAddress, 0xaa});
RgbDirectAccess.Write(new[] {RedCommandAddress, red});
RgbDirectAccess.Write(new[] {GreenCommandAddress, green});
RgbDirectAccess.Write(new[] {BlueCommandAddress, blue});
return this;
}
public IRgbLcdDisplay SetText(string text)
{
TextDirectAccess.Write(new[] {TextCommandAddress, ClearDisplayCommandAddress});
Delay.Milliseconds(50);
TextDirectAccess.Write(new[] {TextCommandAddress, (byte)(DisplayOnCommandAddress | NoCursorCommandAddress)});
TextDirectAccess.Write(new[] {TextCommandAddress, TwoLinesCommandAddress});
var count = 0;
var row = 0;
foreach (var c in text)
{
if (c.Equals('\n') || count == Constants.GroveRgpLcdMaxLength)
{
count = 0;
row += 1;
if (row == Constants.GroveRgpLcdRows)
break;
TextDirectAccess.Write(new byte[] {TextCommandAddress, 0xc0}); //TODO: find out what this address is
if (c.Equals('\n'))
continue;
}
count += 1;
TextDirectAccess.Write(new[] {SetCharacterCommandAddress, (byte) c});
}
return this;
}
}
}