Revert "Removed dependency on libbcm2835.so"

This reverts commit 89925f7.

Author: Eric Bézine

Raspberry.System.nuspec

@@ -14,6 +14,7 @@
       Raspberry.System is a Mono/.NET assembly providing access to Raspberry Pi system features.
 
       It is an initiative of the Raspberry# Community, aimed at providing tools and information concerning use of Raspberry Pi boards with Mono/.NET framework.
+      Parts of this work are based on [BCM2835 C library](http://www.open.com.au/mikem/bcm2835/).
 
       Visit project [Github site](https://github.com/raspberry-sharp/raspberry-sharp-system/) for documentation and samples.
     </description>
@@ -29,6 +30,7 @@
     <file src="Raspberry.System\bin\release\Raspberry.System.dll" target="lib\net40" />
     <file src="Raspberry.System\bin\release\Raspberry.System.pdb" target="lib\net40" />
     <file src="Raspberry.System\bin\release\Raspberry.System.xml" target="lib\net40" />
+    <file src="Raspberry.System\bin\release\libbcm2835.so" target="lib\net40" />
     <file src="Raspberry.System\**\*.cs" target="src" />
   </files>
 </package>

Raspberry.System/Raspberry.System.csproj

@@ -45,6 +45,11 @@
     <Compile Include="Timers\StandardTimer.cs" />
     <Compile Include="Timers\Timer.cs" />
   </ItemGroup>
+  <ItemGroup>
+    <None Include="libbcm2835.so">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.

Raspberry.System/Timers/HighResolutionTimer.cs

@@ -7,9 +7,6 @@
 
 namespace Raspberry.Timers
 {
-    /// <summary>
-    /// Represents a high-resolution timer
-    /// </summary>
     public class HighResolutionTimer : ITimer
     {
         #region Fields
@@ -24,9 +21,6 @@ public class HighResolutionTimer : ITimer
 
         #region Instance Management
 
-        /// <summary>
-        /// Initializes a new instance of the <see cref="HighResolutionTimer"/> class.
-        /// </summary>
         public HighResolutionTimer()
         {
             if (!Board.Current.IsRaspberryPi)
@@ -113,21 +107,6 @@ public void Stop()
             }
         }
 
-        /// <summary>
-        /// Sleeps the specified delay.
-        /// </summary>
-        /// <param name="delay">The delay.</param>
-        public static void Sleep(decimal delay)
-        {
-            var timeSpec = new Interop.timespec
-                               {
-                                   tv_sec = (long) (delay/1000),
-                                   tv_nsec = (long) ((delay%1000)*1000000)
-                               };
-
-            Interop.nanosleep(ref timeSpec);
-        }
-
         #endregion
 
         #region Private Helpers
@@ -146,6 +125,11 @@ private void ThreadProcess()
 
         private void NoOp(){}
 
+        public static void Sleep(decimal delay)
+        {
+            Interop.bcm2835_delayMicroseconds((uint) (delay*1000));
+        }
+
         #endregion
     }
 }

Raspberry.System/Timers/Interop.cs

@@ -6,14 +6,8 @@ internal static class Interop
     {
         #region Methods
 
-        public struct timespec
-        {
-            public long tv_sec;
-            public long tv_nsec;
-        };
-
-        [DllImport("libc.so.6")]
-        public static extern void nanosleep(ref timespec timespec);
+        [DllImport("libbcm2835.so", EntryPoint = "bcm2835_delayMicroseconds")]
+        public static extern void bcm2835_delayMicroseconds(uint microseconds);
 
         #endregion
     }

Raspberry.System/libbcm2835.so

@@ -1,5 +1,4 @@
 using System;
-using Raspberry.Timers;
 
 namespace Test.Board
 {
@@ -15,7 +14,6 @@ static void Main(string[] args)
             {
                 Console.WriteLine("Raspberry Pi running on {0} processor", board.Processor);
                 Console.WriteLine("Firmware rev{0}, board rev{1}", board.Firmware, board.Revision);
-                Timer.Sleep(2000);
                 Console.WriteLine();
                 Console.WriteLine("Serial number: {0}", board.SerialNumber);
             }