Micro SD I/O Problems

Can someone point to an example of doing I/O with the microSD card on Netduino Plus 2? Each and every example I tried (from this forum, from Google search results, etc.) always terminates with messages such as 

or (when using DirectoryInfo):

[font="'courier new', courier, monospace;"]A first chance exception of type 'System.IO.IOException' occurred in Microsoft.SPOT.IO.dll[/font]

All references are to 4.2.0.0 assemblies (except for SecretLabs.NETMF.Hardware.NetduinoPlus which is at 4.2.0.1). 

Any help would be greatly appreciated!

you need the SecretLabs.NETMF.Hardware.Netduino reference for the plus2, not the plus one.

thats a simple sd sample.

static String logDirectory = @"SDLogs";        public void Log(String Text)        {            lock (lockObj)            {                using (StreamWriter writer = new StreamWriter(logDirectory + "log.txt", true))                {                    writer.WriteLine(DateTime.Now + ": " + Text);                }            }        }

Hi NooM, 

Thanks for your response, but this is the output:

References listed in Visual C# 2010 Express are the defaults for the Netduino Plus 2 template, along with System.IO (required because of the StreamWriter):

Microsoft.SPOT.Hardware (Version 4.2.0.0)

Microsoft.SPOT.Hardware.PWM (Version 4.2.0.1)

Microsoft.SPOT.Hardware.SerialPort (Version 4.2.0.0)

Microsoft.SPOT.Hardware.Native (Version 4.2.0.0)

Microsoft.SPOT.Hardware.Net (Version 4.2.0.0)

mscorlib (Version 4.2.0.0)

SecretLabs.NETMF.Hardware (Version 4.2.0.0)

SecretLabs.NETMF.Hardware.Netduino (Version 4.2.1.0)

System (Version 4.2.0.0)

System.IO (Version 4.2.0.0)

sry idk, it should work.

maybe try adding secretlabs.netmf.io (but thats not needed ni think, theres the class to mount the card, wich should do automatically)

it can also be the duino cant read your card, is it 2gb and foratted correctl?

Any ideas?

 

Here's the code I'm using:

I've just pasted MadGeometer's code into a new N+2 project and compiled and run this OK.  The app create a new log file with the expected text in the file.  The references/DLLs in the project are the same as you have quoted.

I'm using a SanDisk 1GB microSD card formatted with a FAT file system.  If memory serves, most cards 2GB or under should work and some cards above 2GB have been found to be working.

Regards,

Mark

I wonder if it is crashing on the DateTime.Now. Where are you setting the Date/Time? If this is a null it could crash it.
 

EDIT:

I just tried the project here with multiple brands of 2gig SD Cards and it worked fine on all.

On all without setting the time it logged the following:

06/01/2011 00:01:18: Hello, world!

Can you zip up the project and post it.  Maybe there is another setting at fault and we can check it.

Edited by Dave VanderWekke, 31 December 2012 - 01:01 PM.

Dave,

I wonder if it is crashing on the DateTime.Now. Where are you setting the Date/Time? If this is a null it could crash it.

If this were null then I would expect this to throw a "Object not set to and instance..." type exception.

The DateTime.Now should reference a static member set up by the .NET run-time system.  You do not have to initialise this, it's just there for you when you first need it.

Regards,

Mark

iam using a rtc to get the date/time for my logfiles.

else it starts with zero everytime power is off

I am getting the exact same erorrs using the exaxt same code as noom.  Sandisk 8GB card, formatted to fat32.  The card works fine in other devices.

Anything else needed to help with this?

I am getting the exact same erorrs using the exaxt same code as noom.  Sandisk 8GB card, formatted to fat32.  The card works fine in other devices.

 

Anything else needed to help with this?

Most cards above 4GB are unlikely to work.  As far as I know, 4GB cards are hit and miss, and most anything 2GB or smaller should work fine.

OK, thanks.  I'll see if I can dig up a smaller card and will try again.

To follow up, downgrading to a 2GB card works like a champ.  Thanks for the help!

To follow up, downgrading to a 2GB card works like a champ.  Thanks for the help!

If one of the answers helped you, please hit the "Mark Solved" button in the lower right hand cornor of the post.

I've tried this.  Doesn't work for me.  Using NETMF 4.3 Netduino Plus 2.  VS 2012, Windows 8 64bit.  References System.IO, Microsoft.SPOT.IO and SecretLabs.NETMF.IO.  Using a SanDisk 1Gb and 2Gb cards.

Code works fine on a Netduino Plus 1.  Same setup, same cards.

Downgraded to 4.2.2.2.  Same issue on N2+.

Occasionally works if left for a looooong time.  No consistent pattern.

Edited by Jack Chidley, 30 June 2013 - 06:32 PM.

I've tried this.  Doesn't work for me.  Using NETMF 4.3 Netduino Plus 2.  VS 2012, Windows 8 64bit.  References System.IO, Microsoft.SPOT.IO and SecretLabs.NETMF.IO.  Using a SanDisk 1Gb and 2Gb cards.

 

Code works fine on a Netduino Plus 1.  Same setup, same cards.

 

Downgraded to 4.2.2.2.  Same issue on N2+.

 

Occasionally works if left for a looooong time.  No consistent pattern.

This is true but can we have any solution for this issue?