Exception while using the book analog input example

NETMF & Gadgeteer
1

I get this in the debugger window.

The debugging target runtime is loading the application assemblies and starting execution.
Ready.

‘Microsoft.SPOT.Debugger.CorDebug.dll’ (Managed): Loaded ‘C:\Program Files (x86)\Microsoft .NET Micro Framework\v4.1\Assemblies\le\mscorlib.dll’, Symbols loaded.
‘Microsoft.SPOT.Debugger.CorDebug.dll’ (Managed): Loaded ‘C:\Program Files (x86)\Microsoft .NET Micro Framework\v4.1\Assemblies\le\Microsoft.SPOT.Native.dll’, Symbols loaded.
‘Microsoft.SPOT.Debugger.CorDebug.dll’ (Managed): Loaded ‘C:\Program Files (x86)\Microsoft .NET Micro Framework\v4.1\Assemblies\le\Microsoft.SPOT.Hardware.dll’, Symbols loaded.
‘Microsoft.SPOT.Debugger.CorDebug.dll’ (Managed): Loaded ‘C:\Program Files (x86)\Microsoft .NET Micro Framework\v4.1\Assemblies\le\Microsoft.SPOT.IO.dll’, Symbols loaded.
‘Microsoft.SPOT.Debugger.CorDebug.dll’ (Managed): Loaded ‘C:\Program Files (x86)\GHI Electronics\GHI NETMF v4.1 SDK\Assemblies\le\GHIElectronics.NETMF.Hardware.dll’
‘Microsoft.SPOT.Debugger.CorDebug.dll’ (Managed): Loaded ‘C:\Users\Mac\Documents\Visual Studio 2010\Projects\FEZ Domino Application1 -macsboost\FEZ Domino Application1 -macsboost\bin\Debug\le\FEZ Domino Application1 -macsboost.exe’, Symbols loaded.
‘Microsoft.SPOT.Debugger.CorDebug.dll’ (Managed): Loaded ‘C:\Program Files (x86)\GHI Electronics\GHI NETMF v4.1 SDK\Assemblies\le\FEZDomino_GHIElectronics.NETMF.FEZ.dll’
‘Microsoft.SPOT.Debugger.CorDebug.dll’ (Managed): Loaded ‘C:\Program Files (x86)\Microsoft .NET Micro Framework\v4.1\Assemblies\le\Microsoft.SPOT.Net.dll’, Symbols loaded.
‘Microsoft.SPOT.Debugger.CorDebug.dll’ (Managed): Loaded ‘C:\Program Files (x86)\Microsoft .NET Micro Framework\v4.1\Assemblies\le\System.dll’, Symbols loaded.
‘Microsoft.SPOT.Debugger.CorDebug.dll’ (Managed): Loaded ‘C:\Program Files (x86)\GHI Electronics\GHI NETMF v4.1 SDK\Assemblies\le\GHIElectronics.NETMF.Hardware.USBizi.dll’
‘Microsoft.SPOT.Debugger.CorDebug.dll’ (Managed): Loaded ‘C:\Program Files (x86)\Microsoft .NET Micro Framework\v4.1\Assemblies\le\Microsoft.SPOT.Hardware.Usb.dll’, Symbols loaded.
‘Microsoft.SPOT.Debugger.CorDebug.dll’ (Managed): Loaded ‘C:\Program Files (x86)\GHI Electronics\GHI NETMF v4.1 SDK\Assemblies\le\GHIElectronics.NETMF.System.dll’
‘Microsoft.SPOT.Debugger.CorDebug.dll’ (Managed): Loaded ‘C:\Program Files (x86)\GHI Electronics\GHI NETMF v4.1 SDK\Assemblies\le\GHIElectronics.NETMF.IO.dll’
‘Microsoft.SPOT.Debugger.CorDebug.dll’ (Managed): Loaded ‘C:\Program Files (x86)\GHI Electronics\GHI NETMF v4.1 SDK\Assemblies\le\GHIElectronics.NETMF.USBClient.dll’
‘Microsoft.SPOT.Debugger.CorDebug.dll’ (Managed): Loaded ‘C:\Program Files (x86)\GHI Electronics\GHI NETMF v4.1 SDK\Assemblies\le\GHIElectronics.NETMF.USBHost.dll’
‘Microsoft.SPOT.Debugger.CorDebug.dll’ (Managed): Loaded ‘C:\Program Files (x86)\Microsoft .NET Micro Framework\v4.1\Assemblies\le\Microsoft.SPOT.Hardware.SerialPort.dll’, Symbols loaded.
‘Microsoft.SPOT.Debugger.CorDebug.dll’ (Managed): Loaded ‘C:\Program Files (x86)\GHI Electronics\GHI NETMF v4.1 SDK\Assemblies\le\GHIElectronics.NETMF.Net.dll’
‘Microsoft.SPOT.Debugger.CorDebug.dll’ (Managed): Loaded ‘C:\Program Files (x86)\GHI Electronics\GHI NETMF v4.1 SDK\Assemblies\le\GHIElectronics.NETMF.Native.dll’
‘Microsoft.SPOT.Debugger.CorDebug.dll’ (Managed): Loaded ‘C:\Program Files (x86)\Microsoft .NET Micro Framework\v4.1\Assemblies\le\System.IO.dll’, Symbols loaded.
The thread ‘’ (0x2) has exited with code 0 (0x0).
True
01/01/2009 00:02:23
#### Exception System.InvalidOperationException - CLR_E_INVALID_OPERATION (1) ####
#### Message:
#### GHIElectronics.NETMF.Hardware.AnalogIn::.ctor [IP: 0000] ####
#### FEZ_Domino_Application1.Program::Main [IP: 0044] ####
A first chance exception of type ‘System.InvalidOperationException’ occurred in GHIElectronics.NETMF.Hardware.dll
An unhandled exception of type ‘System.InvalidOperationException’ occurred in GHIElectronics.NETMF.Hardware.dll

Uncaught exception
The thread ‘’ (0x1) has exited with code 0 (0x0).

My code is little more than the blinking LED example with the analog code thrown in. Anyone know what I am doing wrong?

2

Thanks to FEZ, you can step in the code to see where the exception is coming from. So, what line it is coming from…you probably will know the problem as so as you look at the line casing the exception.

The messages you listed are for loading assemblies and show no information on the exception whatsoever.

3

It is coming from this statement…

                // toggle LED state
                ledState = !ledState;
                led.Write(ledState);
                Debug.Print(ledState.ToString());
                //Debug.Print(FEZ_Pin.AnalogIn.An0.ToString());
                Debug.Print(System.DateTime.Now.ToString());
         
                AnalogIn BatteryVoltage = new AnalogIn((AnalogIn.Pin)FEZ_Pin.AnalogIn.An1);  //<-exception occurs here on the *second* loop of the program.
                BatteryVoltage.SetLinearScale(0, 3300);
                int voltage = BatteryVoltage.Read();
                Debug.Print("Voltage = " + (voltage / 1000).ToString() + "." + (voltage % 1000).ToString());

                FEZ_Shields.KeypadLCD.Print("mac");
4

OK, got it, I was declaring batteryvoltage twice… creating a conflict… I moved those two lines of code to before the loop and now everyone is happy!

5

Once you have declared/instantiated a object with ‘New’, you have used up those resources (i.e. the Analog Input) You can’t then go and declare it once again as it is no longer available. If you need constant access to the object you need to declare it at a class level.