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-rw-r--r--libraries/SD/examples/Files/Files.ino84
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+/*
+ SD card basic file example
+
+ This example shows how to create and destroy 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
+ modified 9 Apr 2012
+ by Tom Igoe
+
+ This example code is in the public domain.
+
+ */
+#include <SD.h>
+
+File myFile;
+
+void setup()
+{
+ // Open serial communications and wait for port to open:
+ Serial.begin(9600);
+ while (!Serial) {
+ ; // wait for serial port to connect. Needed for Leonardo only
+ }
+
+
+ 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.");
+
+ if (SD.exists("example.txt")) {
+ Serial.println("example.txt exists.");
+ }
+ else {
+ Serial.println("example.txt doesn't exist.");
+ }
+
+ // open a new file and immediately close it:
+ Serial.println("Creating example.txt...");
+ myFile = SD.open("example.txt", FILE_WRITE);
+ myFile.close();
+
+ // Check to see if the file exists:
+ if (SD.exists("example.txt")) {
+ Serial.println("example.txt exists.");
+ }
+ else {
+ Serial.println("example.txt doesn't exist.");
+ }
+
+ // delete the file:
+ Serial.println("Removing example.txt...");
+ SD.remove("example.txt");
+
+ if (SD.exists("example.txt")){
+ Serial.println("example.txt exists.");
+ }
+ else {
+ Serial.println("example.txt doesn't exist.");
+ }
+}
+
+void loop()
+{
+ // nothing happens after setup finishes.
+}
+
+
+