Adafruit data logger SD card communication

I am unable to communicate with an SD card attached to a netduino 1 (formatted 4.2.0.1) via adafruit pre assembled SD card

logger shield.

using System;using System.IO;using Microsoft.SPOT.IO;using System.Threading;using Microsoft.SPOT;using Microsoft.SPOT.Hardware;using SecretLabs.NETMF.Hardware;using SecretLabs.NETMF.IO;using SecretLabs.NETMF.Hardware.Netduino;namespace _2010testapp{    public class Program    {	    public static void Main()	    {		    StorageDevice.MountSD("SD1", SPI_Devices.SPI1, Pins.GPIO_PIN_D10);		    string[] directories = System.IO.Directory.GetDirectories(@"");		    Debug.Print("directory count: " + directories.Length.ToString());		    for (int i = 0; i < directories.Length; i++)		    {			    Debug.Print("directory: " + directories[i]);		    }		   			 string[] files = System.IO.Directory.GetFiles("SD1");		    Debug.Print("file count: " + files.Length.ToString());		    for (int i = 0; i < files.Length; i++)		    {			    Debug.Print("file: " + files[i]);		    }		    while (true)		    {		    }	    }    }}

when it gets to the line "string[] files = System.IO.Directory.GetFiles("SD1");"

I get an exception "An unhandled exception of type 'System.IO.IOException' occurred in System.IO.dll"

I have tried with a 4 gb micro sd card in an adapter and a 16gb sd card.

both have been tried in every format availible in the built in windows sd card formatter.

Thank you in advance for any insight to my problem,

Maxwell

Hello Maxwell,

I think your first problem might be that the Netduino only officially supports SD cards up to 2GB. Have a look at this post: http://forums.netdui...ard/#entry47779

 Also, you may want to try changing this line

string[] files = System.IO.Directory.GetFiles(@"SD1");

to this:

string[] files = System.IO.Directory.GetFiles(@"SD1\");

I hope that helps!

I tried changing the line and it still threw the exception. I will try to see if i can get my hands on a non sdhc sd card.

You typically need to double the backslashes so they don't act as escape chars.

This is working code from an N+2

 FileStream filestream = new FileStream(@"SDsettingsWhitelist.txt", FileMode.Open); 

 

You typically need to double the backslashes so they don't act as escape chars.

This is true, however, the use of the "@" symbol before a string indicates it's a verbatim string literal, which precludes the need to escape things:

http://msdn.microsof...0(v=vs.71).aspx

2gb card in the mail, will report back with results.

Good luck!

The code works fine with a 1gb sd card. Thanks for the help. Hopefully support is added for sdhc in the near future.

Excellent!