update v1.4.4.1

Add propertie for time out transaction
Add propertie for SLA

PCF8574/PCF8574/PCF8574.csproj

@@ -38,6 +38,7 @@
     <Reference Include="Microsoft.SPOT.Native" />
   </ItemGroup>
   <ItemGroup>
+    <None Include="ClassDiagram1.cd" />
     <None Include="pcf8574.cd" />
   </ItemGroup>
   <Import Condition="EXISTS('$(NetMfTargetsBaseDir)$(TargetFrameworkVersion)\CSharp.Targets')" Project="$(NetMfTargetsBaseDir)$(TargetFrameworkVersion)\CSharp.Targets" />

PCF8574/PCF8574/Properties/AssemblyInfo.cs

@@ -21,5 +21,5 @@
 //      Build Number
 //      Revision
 //
-[assembly: AssemblyVersion("1.4.3.1")]
-[assembly: AssemblyFileVersion("1.4.3.1")]
+[assembly: AssemblyVersion("1.4.4.1")]
+[assembly: AssemblyFileVersion("1.4.4.1")]

PCF8574/PCF8574/pcf8574.cs

@@ -15,32 +15,60 @@ namespace IO
             /// </remarks>
             public class PCF8574
             {
+                /// <summary>
+                /// Transaction time out = 1s before throwing System.IO.IOException 
+                /// </summary>
+                private UInt16 _transactionTimeOut = 1000;
+
                 /// <summary>
                 /// Slave Adress and frequency configuration
                 /// </summary>
-                private I2CDevice.Configuration config;
+                private I2CDevice.Configuration _config;
 
-                private I2CDevice i2cBus;
+                private I2CDevice _i2cBus;
 
                 /// <summary>
-                /// Transaction time out = 1s before throwing System.IO.IOException 
+                /// 7-bit Slave Adress
                 /// </summary>
-                const UInt16 TRANSACTION_TIME_OUT = 1000;
+                private UInt16 _sla;
 
                 /// <summary>
-                /// 7-bit Slave Adress
+                /// Get or set time before System IO Exception if transaction failed (in ms).
                 /// </summary>
-                UInt16 sla;
+                /// <remarks>
+                /// 1000ms by default
+                /// </remarks>
+                public UInt16 TransactionTimeOut
+                {
+                    get
+                    {
+                        return _transactionTimeOut;
+                    }
 
+                    set
+                    {
+                        _transactionTimeOut = value;
+                    }
+                }
+                /// <summary>
+                /// Get Slave Adress
+                /// </summary>
+                public UInt16 SLA
+                {
+                    get
+                    {
+                        return _sla;
+                    }
+                }
                 /// <summary>
                 /// PCF8574 8-bit I/O expander
                 /// </summary>
                 /// <param name="SLA">PCF8574(@=0x20 to 0x27) or PCF8574A(@=0x38 to 0x3f), 0x38 by default</param>
                 /// <param name="Frequency">100khz to 400kHz, 100kHz by default </param>
                 public PCF8574(UInt16 SLA = 0x38, Int16 Frequency = 100)
                 {
-                    sla = SLA;
-                    config = new I2CDevice.Configuration(SLA, Frequency);
+                    _sla = SLA;
+                    _config = new I2CDevice.Configuration(SLA, Frequency);
                 }
 
                 /// <summary>
@@ -55,11 +83,11 @@ public void Write(Byte value)
                     byte[] outbuffer = new byte[] { value };
 
                     I2CDevice.I2CTransaction[] XAction = new I2CDevice.I2CTransaction[] { I2CDevice.CreateWriteTransaction(outbuffer) };
-                    i2cBus = new I2CDevice(config);
-                    int transferred = i2cBus.Execute(XAction, TRANSACTION_TIME_OUT);
-                    i2cBus.Dispose();
+                    _i2cBus = new I2CDevice(_config);
+                    int transferred = _i2cBus.Execute(XAction, _transactionTimeOut);
+                    _i2cBus.Dispose();
                     if (transferred < (outbuffer.Length))
-                        throw new System.IO.IOException("I2CBus error:" + sla.ToString());
+                        throw new System.IO.IOException("I2CBus error:" + _sla.ToString());
                 }
 
                 /// <summary>
@@ -73,11 +101,11 @@ public byte Read()
                     byte[] inbuffer = new byte[1];
 
                     I2CDevice.I2CTransaction[] XAction = new I2CDevice.I2CTransaction[] { I2CDevice.CreateReadTransaction(inbuffer) };
-                    i2cBus = new I2CDevice(config);
-                    int transferred = i2cBus.Execute(XAction, 1000);
-                    i2cBus.Dispose();
+                    _i2cBus = new I2CDevice(_config);
+                    int transferred = _i2cBus.Execute(XAction, _transactionTimeOut);
+                    _i2cBus.Dispose();
                     if (transferred < (inbuffer.Length))
-                        throw new System.IO.IOException("I2CBus error" + sla.ToString());
+                        throw new System.IO.IOException("I2CBus error" + _sla.ToString());
                     else
                         return inbuffer[0];
                 }