54 lines
2.8 KiB
C#
54 lines
2.8 KiB
C#
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namespace Unosquare.RaspberryIO.Native
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{
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using System.Runtime.InteropServices;
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public partial class WiringPi
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{
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#region WiringPi - SPI Library Calls
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/// <summary>
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/// This function is undocumented
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/// </summary>
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/// <param name="channel">The channel.</param>
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/// <returns>Unknown</returns>
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[DllImport(WiringPiLibrary, EntryPoint = "wiringPiSPIGetFd", SetLastError = true)]
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public static extern int WiringPiSPIGetFd(int channel);
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/// <summary>
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/// This performs a simultaneous write/read transaction over the selected SPI bus. Data that was in your buffer is overwritten by data returned from the SPI bus.
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/// That’s all there is in the helper library. It is possible to do simple read and writes over the SPI bus using the standard read() and write() system calls though –
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/// write() may be better to use for sending data to chains of shift registers, or those LED strings where you send RGB triplets of data.
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/// Devices such as A/D and D/A converters usually need to perform a concurrent write/read transaction to work.
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/// </summary>
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/// <param name="channel">The channel.</param>
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/// <param name="data">The data.</param>
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/// <param name="len">The length.</param>
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/// <returns>The result</returns>
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[DllImport(WiringPiLibrary, EntryPoint = "wiringPiSPIDataRW", SetLastError = true)]
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public static extern int WiringPiSPIDataRW(int channel, byte[] data, int len);
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/// <summary>
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/// This function is undocumented
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/// </summary>
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/// <param name="channel">The channel.</param>
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/// <param name="speed">The speed.</param>
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/// <param name="mode">The mode.</param>
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/// <returns>Unkown</returns>
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[DllImport(WiringPiLibrary, EntryPoint = "wiringPiSPISetupMode", SetLastError = true)]
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public static extern int WiringPiSPISetupMode(int channel, int speed, int mode);
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/// <summary>
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/// This is the way to initialize a channel (The Pi has 2 channels; 0 and 1). The speed parameter is an integer
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/// in the range 500,000 through 32,000,000 and represents the SPI clock speed in Hz.
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/// The returned value is the Linux file-descriptor for the device, or -1 on error. If an error has happened, you may use the standard errno global variable to see why.
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/// </summary>
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/// <param name="channel">The channel.</param>
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/// <param name="speed">The speed.</param>
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/// <returns>The Linux file descriptor for the device or -1 for error</returns>
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[DllImport(WiringPiLibrary, EntryPoint = "wiringPiSPISetup", SetLastError = true)]
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public static extern int WiringPiSPISetup(int channel, int speed);
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#endregion
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}
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}
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