arduino-0022

arduino-0022-linux-x64/libraries/SD/examples/ReadWrite/ReadWrite.pde

@@ -0,0 +1,79 @@
+/*
+  SD card read/write
+ 
+ This example shows how to read and write data to and from an SD card file 	
+ The circuit:
+ * SD card attached to SPI bus as follows:
+ ** MOSI - pin 11
+ ** MISO - pin 12
+ ** CLK - pin 13
+ ** CS - pin 4
+ 
+ created   Nov 2010
+ by David A. Mellis
+ updated 2 Dec 2010
+ by Tom Igoe
+ 
+ This example code is in the public domain.
+ 	 
+ */
+ 
+#include <SD.h>
+
+File myFile;
+
+void setup()
+{
+  Serial.begin(9600);
+  Serial.print("Initializing SD card...");
+  // On the Ethernet Shield, CS is pin 4. It's set as an output by default.
+  // Note that even if it's not used as the CS pin, the hardware SS pin 
+  // (10 on most Arduino boards, 53 on the Mega) must be left as an output 
+  // or the SD library functions will not work. 
+   pinMode(10, OUTPUT);
+   
+  if (!SD.begin(4)) {
+    Serial.println("initialization failed!");
+    return;
+  }
+  Serial.println("initialization done.");
+  
+  // open the file. note that only one file can be open at a time,
+  // so you have to close this one before opening another.
+  myFile = SD.open("test.txt", FILE_WRITE);
+  
+  // if the file opened okay, write to it:
+  if (myFile) {
+    Serial.print("Writing to test.txt...");
+    myFile.println("testing 1, 2, 3.");
+	// close the file:
+    myFile.close();
+    Serial.println("done.");
+  } else {
+    // if the file didn't open, print an error:
+    Serial.println("error opening test.txt");
+  }
+  
+  // re-open the file for reading:
+  myFile = SD.open("test.txt");
+  if (myFile) {
+    Serial.println("test.txt:");
+    
+    // read from the file until there's nothing else in it:
+    while (myFile.available()) {
+    	Serial.write(myFile.read());
+    }
+    // close the file:
+    myFile.close();
+  } else {
+  	// if the file didn't open, print an error:
+    Serial.println("error opening test.txt");
+  }
+}
+
+void loop()
+{
+	// nothing happens after setup
+}
+
+