81 lines
2.6 KiB
C#
81 lines
2.6 KiB
C#
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namespace Unosquare.RaspberryIO.Computer
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{
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using Swan.Abstractions;
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using System.Globalization;
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using System.IO;
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/// <summary>
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/// The Official Raspberry Pi 7-inch touch display from the foundation
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/// Some docs available here:
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/// http://forums.pimoroni.com/t/official-7-raspberry-pi-touch-screen-faq/959
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/// </summary>
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public class DsiDisplay : SingletonBase<DsiDisplay>
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{
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private const string BacklightFilename = "/sys/class/backlight/rpi_backlight/bl_power";
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private const string BrightnessFilename = "/sys/class/backlight/rpi_backlight/brightness";
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/// <summary>
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/// Prevents a default instance of the <see cref="DsiDisplay"/> class from being created.
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/// </summary>
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private DsiDisplay()
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{
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// placeholder
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}
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/// <summary>
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/// Gets a value indicating whether the Pi Foundation Display files are present.
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/// </summary>
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/// <value>
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/// <c>true</c> if this instance is present; otherwise, <c>false</c>.
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/// </value>
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public bool IsPresent => File.Exists(BrightnessFilename);
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/// <summary>
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/// Gets or sets the brightness of the DSI display via filesystem.
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/// </summary>
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/// <value>
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/// The brightness.
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/// </value>
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public byte Brightness
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{
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get
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{
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if (IsPresent == false) return 0;
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return byte.TryParse(File.ReadAllText(BrightnessFilename).Trim(), out var brightness) ? brightness : (byte)0;
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}
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set
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{
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if (IsPresent == false) return;
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File.WriteAllText(BrightnessFilename, value.ToString(CultureInfo.InvariantCulture));
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}
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}
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/// <summary>
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/// Gets or sets a value indicating whether the backlight of the DSI display on.
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/// This operation is performed via the file system
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/// </summary>
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/// <value>
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/// <c>true</c> if this instance is backlight on; otherwise, <c>false</c>.
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/// </value>
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public bool IsBacklightOn
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{
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get
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{
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if (IsPresent == false) return false;
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if (int.TryParse(File.ReadAllText(BacklightFilename).Trim(), out var backlight))
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return backlight == 0;
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return false;
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}
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set
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{
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if (IsPresent == false) return;
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File.WriteAllText(BacklightFilename, value ? "0" : "1");
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}
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}
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}
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}
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