using System;
using System.Runtime.InteropServices;

namespace Unosquare.RaspberryIO.Native {
  public partial class WiringPi {
    #region WiringPi - Shift Library

    /// <summary>
    /// This shifts an 8-bit data value in with the data appearing on the dPin and the clock being sent out on the cPin.
    /// Order is either LSBFIRST or MSBFIRST. The data is sampled after the cPin goes high.
    /// (So cPin high, sample data, cPin low, repeat for 8 bits) The 8-bit value is returned by the function.
    /// </summary>
    /// <param name="dPin">The d pin.</param>
    /// <param name="cPin">The c pin.</param>
    /// <param name="order">The order.</param>
    /// <returns>The result</returns>
    [DllImport(WiringPiLibrary, EntryPoint = "shiftIn", SetLastError = true)]
    public static extern Byte ShiftIn(Byte dPin, Byte cPin, Byte order);

    /// <summary>
    /// The shifts an 8-bit data value val out with the data being sent out on dPin and the clock being sent out on the cPin.
    /// order is as above. Data is clocked out on the rising or falling edge – ie. dPin is set, then cPin is taken high then low
    /// – repeated for the 8 bits.
    /// </summary>
    /// <param name="dPin">The d pin.</param>
    /// <param name="cPin">The c pin.</param>
    /// <param name="order">The order.</param>
    /// <param name="val">The value.</param>
    [DllImport(WiringPiLibrary, EntryPoint = "shiftOut", SetLastError = true)]
    public static extern void ShiftOut(Byte dPin, Byte cPin, Byte order, Byte val);

    #endregion

  }
}