Using the following code, the line Debug.WriteLine($"{DateTime.Now} : Filesystem unmounted"); is never reached, and the board resets itself after a certain amount of time (probably watchdog).
private static void TestUSBHost()
{
var usbHostController = UsbHostController.GetDefault();
usbHostController.OnConnectionChangedEvent += UsbHostController_OnConnectionChangedEvent;
usbHostController.Enable();
}
private static void UsbHostController_OnConnectionChangedEvent(UsbHostController sender,DeviceConnectionEventArgs e)
{
IDriveProvider drive;
var storageController = StorageController.FromName(SC20260.StorageController.UsbHostMassStorage);
switch (e.DeviceStatus)
{
case DeviceConnectionStatus.Connected:
Debug.WriteLine($"{DateTime.Now} : Device connected");
drive = FileSystem.Mount(storageController.Hdc);
Debug.WriteLine($"{DateTime.Now} : Filesystem mounted, getting drive info...");
var driveInfo = new DriveInfo(drive.Name);
Debug.WriteLine($"Free: {driveInfo.TotalFreeSpace}");
Debug.WriteLine($"TotalSize: {driveInfo.TotalSize}");
Debug.WriteLine($"VolumeLabel: {driveInfo.VolumeLabel}");
Debug.WriteLine($"RootDirectory: {driveInfo.RootDirectory}");
Debug.WriteLine($"DriveFormat: {driveInfo.DriveFormat}");
//Show a list of files in the root directory
var directory = new DirectoryInfo($"{drive.Name}\\FT810");
FileInfo[] files = directory.GetFiles();
foreach (FileInfo f in files)
{
Debug.WriteLine(f.Name);
}
break;
case DeviceConnectionStatus.Disconnected:
Debug.WriteLine($"{DateTime.Now} : Device Disconnected");
FileSystem.Unmount(storageController.Hdc);
Debug.WriteLine($"{DateTime.Now} : Filesystem unmounted");
break;
case DeviceConnectionStatus.Bad:
Debug.WriteLine("Bad Device");
break;
}
}
How can I unmount the FS when the device is disconnected ? If I don’t unmount it and I try to insert the USB stick again, I get an exception when it tries to mount the FS again, which is logical.
var directory = new DirectoryInfo($"{drive.Name}\\FT810");
Not sure why GetDirectories() is OK but “new DirectoryInfo()” cause unmount issue.
We will take a look on this issue later, but you can try different way as below:
//Show a list of files in the root directory
//var directory = new DirectoryInfo($"{drive.Name}\\FT810");
//FileInfo[] files = directory.GetFiles();
//foreach (FileInfo f in files)
//{
// Debug.WriteLine(f.Name);
//}
ExploreFolder(driveInfo.RootDirectory, $"{drive.Name}FT810");
static void ExploreFolder(DirectoryInfo directoryInfo, string path)
{
var dirs = directoryInfo.GetDirectories();
foreach (var dir in dirs)
{
if (dir.FullName.CompareTo(path) == 0)
{
var files = dir.GetFiles();
foreach (var file in files)
{
Debug.WriteLine(file.Name);
}
break;
}
else
{
ExploreFolder(dir, path);
}
}
}
But my initial issue was more “how to unmount the filesystem when the device gets disconnected ?”
I’ve tried to unmount first (before mounting) and I get two cases :
“Not mounted exception” the first time, which is expected since the drive has just been inserted
No message or exception the second time (once device has been disconnected then reconnected), which is again expected since a FS has been previously mounted.
But in that second case, I still get the exception when I try to mount the FS
Is there a way to check if a FS is mounted ? I did not find anything obvious so far.
It looks like I did not understand correctly your answer… Are you saying that it’s the use of new DirectoryInfo() that causes the unmount issue afterward ?
If yes, then unfortunately your code does not solve the issue either. FileSystem.Unmount() still hangs the board
Back to this, yes I still can see the issue. Not sure why I didn’t see it before.
Can you please try this:
//Show a list of files in the root directory
var directory = new DirectoryInfo($"{drive.Name}\\FT810");
FileInfo[] files = directory.GetFiles();
foreach (FileInfo f in files)
{
Debug.WriteLine(f.Name);
}
FileSystem.Flush(storageController.Hdc); // try to add this
Just make sure Flush() before Unmount() and not in Disconnected event.
Here is Flush(). Unmount() can be in Disconnected event, it will be OK. Just make sure Flush() before Unmount(), and Flush() must not inside Disconnected event.
@Dat_Tran : it does indeed work with FileSystem.Flush() after transaction : I can now unmount in the disconnected event.
Thank you !
Can I add something, however ? There is no write involved in the example code, as it’s only a directory listing, so why should I “flush” the filesystem after that ?!
(using SC20260E SOM).
