C#控制树莓派GPIO

C#控制树莓派GPIO?

用了Python控制GPIO，用了C控制GPIO，你是否也苦苦寻找c#控制GPIO的方法？

通过多天的实验，最终成功，并把这个帮助类贡献给大家，让C#在Linux自由飞扬！

（本人使用的框架是：Nancyfx + Jexus）

using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;

namespace Nancy.Linux
{
    /// <summary>
    /// 控制树莓派GPIO类
    /// 作者: Fang
    /// </summary>
    public static class FileGpio
    {
        private enum EnumDirection { In, Out };

        private const string GpioPath = "/sys/class/gpio/";

        private static readonly List<Gpio> OutExported = new List<Gpio>();

        private static readonly List<Gpio> InExported = new List<Gpio>();

        //设置Pin的输入或输出
        private static void SetupPin(Gpio pin, EnumDirection direction)
        {
            //如果包含了,释放引脚
            if (OutExported.Contains(pin) || InExported.Contains(pin)) UnexportPin(pin);

            //输出
            File.WriteAllText(GpioPath + "export", pin.Value.ToString(CultureInfo.InvariantCulture));

            //设置输入或输出方向
            File.WriteAllText(GpioPath + pin.Name + "/direction", direction.ToString().ToLower());

            //添加到列表
            if (direction == EnumDirection.Out)
                OutExported.Add(pin);
            else
                InExported.Add(pin);
        }

        #region Output

        /// <summary>
        /// 输出信号
        /// </summary>
        /// <param name="pin">Gpios</param>
        /// <param name="value">true:HIGH false:LOW</param>
        public static void OutputPin(Gpio pin, bool value)
        {
            if (!OutExported.Contains(pin) || InExported.Contains(pin)) SetupPin(pin, EnumDirection.Out);

            File.WriteAllText(GpioPath + pin.Name + "/value", value ? "1" : "0");

        }

        /// <summary>
        /// 输出信号
        /// </summary>
        /// <param name="bcm">BCM编码</param>
        /// <param name="value">true:HIGH false:LOW</param>
        public static void OutputPin(int bcm, bool value)
        {
            OutputPin(new Gpio(bcm), value);
        }

        #endregion

        #region Input

        /// <summary>
        /// 获取输入信号 布尔
        /// </summary>
        /// <param name="pin">GPIO</param>
        /// <returns></returns>
        public static bool InputPinByBoolean(Gpio pin)
        {
            bool returnValue = false;

            if (!InExported.Contains(pin) || OutExported.Contains(pin)) SetupPin(pin, EnumDirection.In);

            string filename = GpioPath + pin.Name + "/value";
            if (File.Exists(filename))
            {
                string readValue = File.ReadAllText(filename);
                if (readValue.Length > 0 && readValue[0] == '1') returnValue = true;
            }
            else
                throw new Exception(string.Format("Cannot read from {0}. File does not exist", pin.Name));


            return returnValue;
        }

        /// <summary>
        /// 获取输入信号 布尔
        /// </summary>
        /// <param name="bcm">BCM编码</param>
        /// <returns></returns>
        public static bool InputPinByBoolean(int bcm)
        {
            return InputPinByBoolean(new Gpio(bcm));
        }

        /// <summary>
        /// 获取输入信号 double
        /// </summary>
        /// <param name="pin">GPIO</param>
        /// <returns></returns>
        public static double InputPinByDouble(Gpio pin)
        {
            if (!InExported.Contains(pin) || OutExported.Contains(pin)) SetupPin(pin, EnumDirection.In);

            string filename = GpioPath + pin.Name + "/value";
            if (File.Exists(filename))
            {
                string readValue = File.ReadAllText(filename);
                if (readValue.Length > 0)
                {
                    double value;
                    if (double.TryParse(readValue, out value))
                    {
                        return value;
                    }
                }
            }
            else
                throw new Exception(string.Format("Cannot read from {0}. File does not exist", pin.Name));

            return -1;
        }

        /// <summary>
        /// 获取输入信号 double
        /// </summary>
        /// <param name="bcm">BCM编码</param>
        /// <returns></returns>
        public static double InputPinByDouble(int bcm)
        {
            return InputPinByDouble(new Gpio(bcm));
        }

        /// <summary>
        /// 获取输入信号 string
        /// </summary>
        /// <param name="pin">GPIO</param>
        /// <returns></returns>
        public static string InputPinByString(Gpio pin)
        {
            if (!InExported.Contains(pin) || OutExported.Contains(pin)) SetupPin(pin, EnumDirection.In);

            string filename = GpioPath + pin.Name + "/value";
            if (File.Exists(filename))
            {
                string readValue = File.ReadAllText(filename);
                if (readValue.Length > 0)
                {
                    return readValue;
                }
            }
            else
                throw new Exception(string.Format("Cannot read from {0}. File does not exist", pin.Name));

            return "";
        }

        /// <summary>
        /// 获取输入信号 string
        /// </summary>
        /// <param name="bcm">BCM编码</param>
        /// <returns></returns>
        public static string InputPinByString(int bcm)
        {
            return InputPinByString(new Gpio(bcm));
        }

        #endregion

        public static void UnexportPin(Gpio pin)
        {
            bool found = false;
            if (OutExported.Contains(pin))
            {
                found = true;
                OutExported.Remove(pin);
            }
            if (InExported.Contains(pin))
            {
                found = true;
                InExported.Remove(pin);
            }

            if (found)
            {
                File.WriteAllText(GpioPath + "unexport", pin.Value.ToString(CultureInfo.InvariantCulture));
            }
        }

        public static void CleanUpAllPins()
        {
            for (int p = OutExported.Count - 1; p >= 0; p--) UnexportPin(OutExported[p]);
            for (int p = InExported.Count - 1; p >= 0; p--) UnexportPin(InExported[p]);
        }
    }

    public class Gpio
    {
        public string Name { get; private set; }

        public int Value { get; private set; }

        /// <summary>
        /// 创建一个GPIO
        /// </summary>
        /// <param name="value">BCM编码</param>
        public Gpio(int value)
        {
            Name = "gpio" + value;
            Value = value;
        }
    }

    public static class Gpios
    {
        public static readonly Gpio Gpio0 = new Gpio(17);
        public static readonly Gpio Gpio1 = new Gpio(18);
        public static readonly Gpio Gpio2 = new Gpio(27);
        public static readonly Gpio Gpio3 = new Gpio(22);
        public static readonly Gpio Gpio4 = new Gpio(23);
        public static readonly Gpio Gpio5 = new Gpio(24);
        public static readonly Gpio Gpio6 = new Gpio(25);
        public static readonly Gpio Gpio7 = new Gpio(4);
        public static readonly Gpio Gpio21 = new Gpio(5);
        public static readonly Gpio Gpio22 = new Gpio(6);
        public static readonly Gpio Gpio23 = new Gpio(13);
        public static readonly Gpio Gpio24 = new Gpio(19);
        public static readonly Gpio Gpio25 = new Gpio(26);
        public static readonly Gpio Gpio26 = new Gpio(12);
        public static readonly Gpio Gpio27 = new Gpio(16);
        public static readonly Gpio Gpio28 = new Gpio(20);
        public static readonly Gpio Gpio29 = new Gpio(21);
    }
}

调用(小灯 亮2秒后 熄灭):

FileGpio.OutputPin(Gpios.Gpio0, true);
Thread.Sleep(2000);
FileGpio.UnexportPin(gpio);