Stopping USBC_MassStorage

NETMF & Gadgeteer
1

I have successfully enabled my Panda II to act as a USB Mass Storage device; I have to reset the device and short MOD to ground FYI. Now, I want the MassStorage to stop on the push of the LDR button so that I can access the files on the SD card.

I have tried calling disablelun(); when the button is pushed, but that doesn’t seem to stop MS it just seems to make the SD card Inaccessible.

I have more to the code, but I will show below what I have concerning this…

public class Program
    {

        static PersistentStorage sdCard;
        static USBC_MassStorage sdStorage;
        public static void Main()
        {
            InterruptPort IntButton = new InterruptPort((Cpu.Pin)FEZ_Pin.Digital.LDR, false,
                                                        Port.ResistorMode.PullUp,
                                                        Port.InterruptMode.InterruptEdgeLow);

            IntButton.OnInterrupt += new NativeEventHandler(IntButton_OnInterrupt);

            //"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""

            sdCard = new PersistentStorage("SD");

            sdStorage = USBClientController.StandardDevices.StartMassStorage();

            sdStorage.AttachLun(0, sdCard, " ", " ");

            sdStorage.EnableLun(0);

            Thread.Sleep(Timeout.Infinite);
        }

        static void IntButton_OnInterrupt(uint port, uint state, DateTime time)
        {
            sdStorage.DisableLun(0);
2

Check the documentation it shows how to do exactly that.

I think you are missing the code where you supposed to mount the file system from sd card in order to access it.

See example at the bottom of the page:

http://www.ghielectronics.com/downloads/NETMF/Library%20Documentation%20v4.1/html/607ac9a8-62a0-ad43-cd1c-3034863c1b46.htm

3

@ Architect - I believe I do just that. Here is my full code. I have reviewed that document, but I don’t know what I am missing

namespace FEZ_Panda_II_Application1
{
    public class Program
    {

        static PersistentStorage sdCard;
        static USBC_MassStorage sdStorage;
        public static void Main()
        {
            InterruptPort IntButton = new InterruptPort((Cpu.Pin)FEZ_Pin.Digital.LDR, false,
                                                        Port.ResistorMode.PullUp,
                                                        Port.InterruptMode.InterruptEdgeLow);

            IntButton.OnInterrupt += new NativeEventHandler(IntButton_OnInterrupt);

            //"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""

            sdCard = new PersistentStorage("SD");

            sdStorage = USBClientController.StandardDevices.StartMassStorage();

            sdStorage.AttachLun(0, sdCard, " ", " ");

            sdStorage.EnableLun(0);

            Thread.Sleep(Timeout.Infinite);
        }

        static void IntButton_OnInterrupt(uint port, uint state, DateTime time)
        {
            sdStorage.DisableLun(0);

            SerialPort UART = new SerialPort("COM1", 2400);

            int counter = 0;
            UART.Open();

            // ...
            // SD Card is inserted
            // Create a new storage device
            PersistentStorage sdPS = new PersistentStorage("SD");

            // Mount the file system
            sdPS.MountFileSystem();


            // Assume one storage device is available, access it through 
            // Micro Framework and display available files and folders:
            Debug.Print("Getting files and folders:");
            if (VolumeInfo.GetVolumes()[0].IsFormatted)
            {
                string rootDirectory =
                    VolumeInfo.GetVolumes()[0].RootDirectory;
                string outstr = "Files in " + rootDirectory + "\r\n";
                string[] files = Directory.GetFiles(rootDirectory);
                UART.Write(UTF8Encoding.UTF8.GetBytes(outstr), 0, outstr.Length);

                Debug.Print("Files available on " + rootDirectory + ":");
                for (int i = 0; i < files.Length; i++)
                {
                    Debug.Print(files[i]);
                    outstr = files[i] + "\r\n";
                    UART.Write(UTF8Encoding.UTF8.GetBytes(outstr), 0, outstr.Length);


                }

            }
        }
    }
}
4

I think this is normal. This is liek if you removed SD card from USB reader. The reader is there but SD was removed, which is what you need.

5

try disposing sdCard before creating another persistence storage object? and sdStorage…

6

Or just replace

            
            // SD Card is inserted
            // Create a new storage device
            PersistentStorage sdPS = new PersistentStorage("SD");
 
            // Mount the file system
            sdPS.MountFileSystem();

with this:

sdCard.MountFileSystem();
7

@ Architect - Okay, I just tried replacing the code as stated above; nothing seemed to change however. I did not get an output to the serial (TeraTerm) listing the files on the SDcard.

When I disbalelun() and the disk becomes and an inaccessible state, I should be able to read files correct?

Thanks for the help

8

Got it!! Thanks!

9

Good! So what is the final version of the code that worked for you?