First Commit

libraries/SdFat/examples/examplesV1/fgets/fgets.ino

@@ -0,0 +1,88 @@
+// Demo of fgets function to read lines from a file.
+#include <SPI.h>
+#include "SdFat.h"
+#include "sdios.h"
+
+// SD chip select pin
+const uint8_t chipSelect = SS;
+
+SdFat sd;
+// print stream
+ArduinoOutStream cout(Serial);
+//------------------------------------------------------------------------------
+// store error strings in flash memory
+#define error(s) sd.errorHalt(F(s))
+//------------------------------------------------------------------------------
+void demoFgets() {
+  char line[25];
+  int n;
+  // open test file
+  SdFile rdfile("fgets.txt", O_RDONLY);
+
+  // check for open error
+  if (!rdfile.isOpen()) {
+    error("demoFgets");
+  }
+
+  cout << endl << F(
+         "Lines with '>' end with a '\\n' character\n"
+         "Lines with '#' do not end with a '\\n' character\n"
+         "\n");
+
+  // read lines from the file
+  while ((n = rdfile.fgets(line, sizeof(line))) > 0) {
+    if (line[n - 1] == '\n') {
+      cout << '>' << line;
+    } else {
+      cout << '#' << line << endl;
+    }
+  }
+}
+//------------------------------------------------------------------------------
+void makeTestFile() {
+  // create or open test file
+  SdFile wrfile("fgets.txt", O_WRONLY | O_CREAT | O_TRUNC);
+
+  // check for open error
+  if (!wrfile.isOpen()) {
+    error("MakeTestFile");
+  }
+
+  // write test file
+  wrfile.print(F(
+                 "Line with CRLF\r\n"
+                 "Line with only LF\n"
+                 "Long line that will require an extra read\n"
+                 "\n"  // empty line
+                 "Line at EOF without NL"
+               ));
+  wrfile.close();
+}
+//------------------------------------------------------------------------------
+void setup(void) {
+  Serial.begin(9600);
+
+  // Wait for USB Serial
+  while (!Serial) {
+    yield();
+  }
+
+  cout << F("Type any character to start\n");
+  while (!Serial.available()) {
+    yield();
+  }
+  delay(400);  // catch Due reset problem
+
+  // 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();
+  }
+
+  makeTestFile();
+
+  demoFgets();
+
+  cout << F("\nDone\n");
+}
+void loop(void) {}