First Commit

libraries/SdFat/examples/BackwardCompatibility/BackwardCompatibility.ino

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+// A simple read/write example for SD.h.
+// Mostly from the SD.h ReadWrite example.
+//
+// Your SD must be formatted FAT16/FAT32.
+//
+// SD.h does not support some default SdFat features.
+// To compare flash size, set USE_FAT_FILE_FLAG_CONTIGUOUS,
+// ENABLE_DEDICATED_SPI, and USE_LONG_FILE_NAMES to zero also
+// set SDFAT_FILE_TYPE to one in SdFat/src/SdFatCongfig.h
+//
+// Set USE_SD_H nonzero to use SD.h.
+// Set USE_SD_H zero to use SdFat.h.
+//
+#define USE_SD_H 0
+//
+#if USE_SD_H
+#include <SD.h>
+#else  // USE_SD_H
+#include "SdFat.h"
+SdFat SD;
+#endif  // USE_SD_H
+
+// Modify SD_CS_PIN for your board.
+// For Teensy 3.6 and SdFat.h use BUILTIN_SDCARD.
+#define SD_CS_PIN SS
+
+File myFile;
+
+void setup() {
+  Serial.begin(9600);
+  while (!Serial) {
+  }
+
+#if USE_SD_H
+  Serial.println(F("Using SD.h. Set USE_SD_H zero to use SdFat.h."));
+#else   // USE_SD_H
+  Serial.println(F("Using SdFat.h. Set USE_SD_H nonzero to use SD.h."));
+#endif  // USE_SD_H
+  Serial.println(F("\nType any character to begin."));
+  while (!Serial.available()) {
+    yield();
+  }
+  Serial.print("Initializing SD card...");
+
+  if (!SD.begin(SD_CS_PIN)) {
+    Serial.println("initialization failed!");
+    return;
+  }
+  Serial.println("initialization done.");
+
+  // open the file.
+  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
+}