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POCInt not working as expected in .Net MF
 

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    <p>I've got something pretty noddy to cross-fade the colour of an RGB led and I'm having problems getting the desired values.</p> <p>I've stripped this example down to a bare minimum but <code>Start</code>, <code>End</code> and <code>Steps</code> will all be variable...</p> <p>This <em>should</em> linearly increment <code>R</code> (UInt) from 0 to 255 in 100 steps. I'm not too worried about precision here so I don't really care if it rounds properly or just does a <code>Floor</code>/<code>Ceiling</code></p> <pre><code> Dim Start As UInteger = 0 Dim [End] As UInteger = 255 Dim Steps = 100 For x = 1 To Steps Dim Temp = ([End] - Start) / Steps * x + Start Dim R = CUInt(Temp) Debug.Print(x.ToString &amp; ": Temp: " &amp; Temp.ToString &amp; ", R:" &amp; R.ToString) LedR.SetPulse(255, R) Threading.Thread.Sleep(20) Next </code></pre> <p>This Outputs:</p> <pre><code>1: Temp: 2.5500, R:196608 2: Temp: 5.1000, R:327680 3: Temp: 7.6500, R:524288 4: Temp: 10.2000, R:655360 5: Temp: 12.7499, R:851968 ... 95: Temp: 242.2488, R:15859712 96: Temp: 244.7988, R:16056320 97: Temp: 247.3488, R:16187392 98: Temp: 249.8988, R:16384000 99: Temp: 252.4488, R:16515072 100: Temp: 254.9988, R:16711680 </code></pre> <p>As you can see, the Temp variable is pretty-much correct, allowing for some slight imprecision but I can't see what the correlation is with <code>R</code>.</p> <p>It's possible that CUint is simply reading the bits for Temp and treating the <code>Double</code> as a <code>UInt</code> - but if so, how do I get it to convert it correctly?</p> <p>(Incidentally, this is running on a <a href="http://netduino.com/" rel="nofollow">netduino</a>), .Net Micro Framework 4.2</p> <p>Edit: Tests requested below:</p> <pre><code> Dim Test As Integer = 2 Debug.Print(Test.ToString) Debug.Print(CInt(Test).ToString) Debug.Print(CUInt(Test).ToString) 2 2 2 Dim Test As Double = 2.5 Debug.Print(Test.ToString) Debug.Print(CInt(Test).ToString) Debug.Print(CUInt(Test).ToString) 2.5000 131072 131072 </code></pre> <p>Using the following code...</p> <pre><code> For x = 0 To Steps Dim Temp As Long = ([End] - Start) \ Steps * x + Start Dim R = CType(Temp, UInteger) Debug.Print(x.ToString &amp; ": Temp: " &amp; Temp.ToString &amp; ", R:" &amp; R.ToString) LedR.SetPulse(255, R) Threading.Thread.Sleep(20) Next </code></pre> <p>I get (on the <code>Dim Temp</code> line):</p> <pre><code>An unhandled exception of type 'System.Exception' occurred in Netduino_VBTest.exe </code></pre> <p>There's no inner exception but just above it in the output is a first chance exception which I'm guessing is the root cause:</p> <pre><code>A first chance exception of type 'System.NotImplementedException' occurred in Microsoft.SPOT.Native.dll </code></pre>
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