Operating ARM CAN Bus Drivers Using C#

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C#

driver

ARM

Hello,

I am doing my MSc project and I am having a problem driving my CAN bus using C#.

I am using this ARM based HMI and the supported BSP source files for Windows CE 6.0 coming from the manufacturer's webpage:
http://www.technexion.com/index.php/products/hmi/th-0735w[^]

There is a CAN bus example written in C++ which I have successfully tested. I have designed my application using C# and I want to include CAN bus in my application. I don't know how to link C# with CAN bus drivers. I have several .dll files and I think the omap_can.dll is the one associated with the CAN bus drivers.

I am referring to this manual (CAN Driver section) for invoking the CAN driver because TechNexion does not provide any documentation:
http://processors.wiki.ti.com/index.php/WinCE-BSP_ARM-A8_User_Guide#CAN_Setup_and_Demo[^]

I searched how to use invoke online but I am doing something wrong in my code. The application p/invoke which generates the code does not open the omap_can.dll, so I have to type it properly on my own.

The Dependency Walker application that I used to see the contents of omap_can.dll gives the message "Error: At least one module has an unresolved import due to a missing export function in an implicitly dependent module." and allows me to view the functions (slightly different names as opposed to the ARM guide):
CAN_Close
CAN_Deinit
CAN_Init
CAN_IOControl
CAN_Open
CAN_PowerDown
CAN_PowerUp

I can also see that the omap_can.dll is linked with the cedk.dll, coredll.dll and fpcrt.dll.

I really need to understand what I am doing because I almost try random solutions.

I was attempt to call a function "CAN_Init" using C#. Here is my code (it compiles in Visual Studio 2005, but crashes when used on the device):

namespace HMIShell
{
    public partial class HMIShell : Form
    {
        [DllImport("\\Storage Card\\omap_can.dll")]
        public static extern void CAN_Init(); // I am not sure about this line

        public HMIShell()
        {
            InitializeComponent(); // Automatically generated method for windows forms
            CAN_Init(); // This part fails
        }

Thank you in advance.