First Commit

libraries/SdFat/examples/examplesV1/ReadCsvStream/ReadCsvStream.ino

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+/*
+ *  This example reads a simple CSV, comma-separated values, file.
+ *  Each line of the file has a label and three values, a long and two floats.
+ */
+#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);
+
+char fileName[] = "testfile.csv";
+//------------------------------------------------------------------------------
+// store error strings in flash to save RAM
+#define error(s) sd.errorHalt(F(s))
+//------------------------------------------------------------------------------
+// read and print CSV test file
+void readFile() {
+  long lg = 0;
+  float f1, f2;
+  char text[10];
+  char c1, c2, c3;  // space for commas.
+
+  // open input file
+  ifstream sdin(fileName);
+
+  // check for open error
+  if (!sdin.is_open()) {
+    error("open");
+  }
+
+  // read until input fails
+  while (1) {
+    // Get text field.
+    sdin.get(text, sizeof(text), ',');
+
+    // Assume EOF if fail.
+    if (sdin.fail()) {
+      break;
+    }
+
+    // Get commas and numbers.
+    sdin >> c1 >> lg >> c2 >> f1 >> c3 >> f2;
+
+    // Skip CR/LF.
+    sdin.skipWhite();
+
+    if (sdin.fail()) {
+      error("bad input");
+    }
+
+    // error in line if not commas
+    if (c1 != ',' || c2 != ',' || c3 != ',') {
+      error("comma");
+    }
+
+    // print in six character wide columns
+    cout << text << setw(6) << lg << setw(6) << f1 << setw(6) << f2 << endl;
+  }
+  // Error in an input line if file is not at EOF.
+  if (!sdin.eof()) {
+    error("readFile");
+  }
+}
+//------------------------------------------------------------------------------
+// write test file
+void writeFile() {
+
+  // create or open and truncate output file
+  ofstream sdout(fileName);
+
+  // write file from string stored in flash
+  sdout << F(
+          "Line 1,1,2.3,4.5\n"
+          "Line 2,6,7.8,9.0\n"
+          "Line 3,9,8.7,6.5\n"
+          "Line 4,-4,-3.2,-1\n") << flush;
+
+  // check for any errors
+  if (!sdout) {
+    error("writeFile");
+  }
+
+  sdout.close();
+}
+//------------------------------------------------------------------------------
+void setup() {
+  Serial.begin(9600);
+
+  // Wait for USB Serial
+  while (!Serial) {
+    yield();
+  }
+  cout << 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();
+  }
+
+  // create test file
+  writeFile();
+
+  cout << endl;
+
+  // read and print test
+  readFile();
+
+  cout << "\nDone!" << endl;
+}
+void loop() {}