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add example!

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1 parent db87b8c commit dea000f1d8eb3b272b09c81b60dbd41d0225b448 @ladyada ladyada committed Aug 8, 2012
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  1. +72 −0 examples/DumpFile/DumpFile.pde
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+/*
+ SD card file dump
+
+ This example shows how to read a file from the SD card using the
+ SD library and send it over the serial port.
+
+ The circuit:
+ * SD card attached to SPI bus as follows:
+ ** UNO: MOSI - pin 11, MISO - pin 12, CLK - pin 13, CS - pin 4 (CS pin can be changed)
+ and pin #10 (SS) must be an output
+ ** Mega: MOSI - pin 51, MISO - pin 50, CLK - pin 52, CS - pin 4 (CS pin can be changed)
+ and pin #52 (SS) must be an output
+ ** Leonardo: Connect to hardware SPI via the ICSP header
+
+ created 22 December 2010 by Limor Fried
+ modified 9 Apr 2012 by Tom Igoe
+
+ This example code is in the public domain.
+
+ */
+
+#include <SD.h>
+
+// change this to match your SD shield or module;
+// Arduino Ethernet shield: pin 4
+// Adafruit SD shields and modules: pin 10
+// Sparkfun SD shield: pin 8
+const int chipSelect = 4;
+
+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...");
+ // make sure that the default chip select pin is set to
+ // output, even if you don't use it:
+ pinMode(SS, OUTPUT);
+
+ // see if the card is present and can be initialized:
+ if (!SD.begin(chipSelect)) {
+ Serial.println("Card failed, or not present");
+ // don't do anything more:
+ return;
+ }
+ Serial.println("card initialized.");
+
+ // open the file. note that only one file can be open at a time,
+ // so you have to close this one before opening another.
+ File dataFile = SD.open("datalog.txt");
+
+ // if the file is available, write to it:
+ if (dataFile) {
+ while (dataFile.available()) {
+ Serial.write(dataFile.read());
+ }
+ dataFile.close();
+ }
+ // if the file isn't open, pop up an error:
+ else {
+ Serial.println("error opening datalog.txt");
+ }
+}
+
+void loop()
+{
+}
+

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