First Commit

libraries/SdFat/examples/examplesV1/#attic/append/append.ino

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+/*
+ * Append Example
+ *
+ * This program shows how to use open for append.
+ * The program will append 100 line each time it opens the file.
+ * The program will open and close the file 100 times.
+ */
+#include <SPI.h>
+#include "SdFat.h"
+#include "sdios.h"
+
+// SD chip select pin
+const uint8_t chipSelect = SS;
+
+// file system object
+SdFat sd;
+
+// create Serial stream
+ArduinoOutStream cout(Serial);
+
+// store error strings in flash to save RAM
+#define error(s) sd.errorHalt(F(s))
+//------------------------------------------------------------------------------
+void setup() {
+  // filename for this example
+  char name[] = "append.txt";
+
+  Serial.begin(9600);
+
+  // Wait for USB Serial
+  while (!Serial) {
+    yield();
+  }
+  // F() stores strings in flash to save RAM
+  cout << endl << F("Type any character to start\n");
+  while (!Serial.available()) {
+    yield();
+  }
+
+  // Initialize at the highest speed supported by the board that is
+  // not over 50 MHz. Try a lower speed if SPI errors occur.
+  if (!sd.begin(chipSelect, SD_SCK_MHZ(50))) {
+    sd.initErrorHalt();
+  }
+
+  cout << F("Appending to: ") << name;
+
+  for (uint8_t i = 0; i < 100; i++) {
+    // open stream for append
+    ofstream sdout(name, ios::out | ios::app);
+    if (!sdout) {
+      error("open failed");
+    }
+
+    // append 100 lines to the file
+    for (uint8_t j = 0; j < 100; j++) {
+      // use int() so byte will print as decimal number
+      sdout << "line " << int(j) << " of pass " << int(i);
+      sdout << " millis = " << millis() << endl;
+    }
+    // close the stream
+    sdout.close();
+
+    if (!sdout) {
+      error("append data failed");
+    }
+
+    // output progress indicator
+    if (i % 25 == 0) {
+      cout << endl;
+    }
+    cout << '.';
+  }
+  cout << endl << "Done" << endl;
+}
+//------------------------------------------------------------------------------
+void loop() {}