8 replies to this topic

[HaxyMaxy]

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

 

[ShVerni]

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!

[HaxyMaxy]

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.

[wendo]

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); 

[ShVerni]

 

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

[HaxyMaxy]

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

[ShVerni]

Good luck!

[HaxyMaxy]

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

[ShVerni]

Excellent!