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PONetduino + Ethernet Shield: How to write to SD card?
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  1. PONetduino + Ethernet Shield: How to write to SD card?
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    copied!<p>I have tried several example programs to write data to the SD card mounted on the <a href="http://arduino.cc/en/Main/ArduinoEthernetShield" rel="nofollow noreferrer">Ethernet shield</a>, but none worked. The SD card size is 4 GB and formatted as <a href="http://en.wikipedia.org/wiki/File_Allocation_Table#FAT32" rel="nofollow noreferrer">FAT32</a>.</p> <p>The Ethernet shield is the following:</p> <p>(Bought on Amazon - <a href="http://rads.stackoverflow.com/amzn/click/B0022TWQ22" rel="nofollow noreferrer">Arduino Ethernet Shield</a>)</p> <p><img src="https://i.stack.imgur.com/Qmwk7.jpg" alt="Enter image description here"></p> <p>And this is example code that doesn't work when creating a Netduino application (not Netduino Plus application) (thefirst line throws an exception):</p> <pre><code>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 &lt; 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 &lt; files.Length; i++) { Debug.Print("filename: " + files[i]); FileStream fs = new FileStream(files[i], FileMode.Open, FileAccess.Read, FileShare.None, 512); StreamReader sr = new StreamReader(fs); Debug.Print("contents: " + sr.ReadToEnd()); } } </code></pre> <p>Is there a example working program?</p> <p><strong>Solution:</strong></p> <p>Thanks to Chris and James, I managed to write to the SD card and read from it. After putting everything together, <a href="http://mypetprojects.blogspot.com/2011/10/netduino-using-ethernet-shield-to.html" rel="nofollow noreferrer">I wrote an article</a>, in case anyone else faces the same issues.</p>
 

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