/*
SD card datalogger
This example shows how to log data from three analog sensors
to an SD card using the SD library.
The circuit:
* analog sensors on analog ins 0, 1, and 2
* SD card attached to SPI bus as follows:
** MOSI - pin 11, pin 7 on Teensy with audio board
** MISO - pin 12
** CLK - pin 13, pin 14 on Teensy with audio board
** CS - pin 4, pin 10 on Teensy with audio board
created 24 Nov 2010
modified 9 Apr 2012
by Tom Igoe
This example code is in the public domain.
*/
#include <SD.h>
#include <SPI.h>
const int chipSelect = 8;
[B]File dataFile; // Specifes that dataFile is of File type
[/B]
int record_count = 0;
bool write_data = false;
void setup()
{
// Open serial communications and wait for port to open:
Serial.begin(115200);
while (!Serial) {
// wait for serial port to connect.
}
Serial.print(CrashReport);
Serial.println("\n" __FILE__ " " __DATE__ " " __TIME__);
Serial.print("Initializing SD card...");
// see if the card is present and can be initialized:
if (!SD.begin(chipSelect)) {
Serial.println("Card failed, or not present");
while (1) {
// No SD card, so don't do anything more - stay stuck here
}
}
Serial.println("card initialized.");
menu();
}
void loop()
{
if ( Serial.available() ) {
char rr;
rr = Serial.read();
switch (rr) {
case 'l': listFiles(); break;
case 'e': eraseFiles(); break;
case 's':
{
Serial.println("\nLogging Data!!!");
write_data = true; // sets flag to continue to write data until new command is received
// opens a file or creates a file if not present, FILE_WRITE will append data to
// to the file created.
dataFile = SD.open("datalog.txt", FILE_WRITE);
logData();
}
break;
case 'x': stopLogging(); break;
case 'd': dumpLog(); break;
case '\r':
case '\n':
case 'h': menu(); break;
}
while (Serial.read() != -1) ; // remove rest of characters.
}
if(write_data) logData();
}
void logData()
{
// make a string for assembling the data to log:
String dataString = "";
// read three sensors and append to the string:
for (int analogPin = 0; analogPin < 3; analogPin++) {
int sensor = analogRead(analogPin);
dataString += String(sensor);
if (analogPin < 2) {
dataString += ",";
}
}
// if the file is available, write to it:
if (dataFile) {
dataFile.println(dataString);
// print to the serial port too:
Serial.println(dataString);
record_count += 1;
} else {
// if the file isn't open, pop up an error:
Serial.println("error opening datalog.txt");
}
delay(100); // run at a reasonable not-too-fast speed for testing
}
void stopLogging()
{
Serial.println("\nStopped Logging Data!!!");
write_data = false;
// Closes the data file.
dataFile.close();
Serial.printf("Records written = %d\n", record_count);
}
void dumpLog()
{
Serial.println("\nDumping Log!!!");
// open the 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 menu()
{
Serial.println();
Serial.println("Menu Options:");
Serial.println("\tl - List files on disk");
Serial.println("\te - Erase files on disk");
Serial.println("\ts - Start Logging data (Restarting logger will append records to existing log)");
Serial.println("\tx - Stop Logging data");
Serial.println("\td - Dump Log");
Serial.println("\th - Menu");
Serial.println();
}
void listFiles()
{
File root = SD.open("/");
printDirectory(root, 0);
}
void eraseFiles()
{
Serial.println("\nNot supported !");
}
void printDirectory(File dir, int numSpaces) {
while(true) {
File entry = dir.openNextFile();
if (! entry) {
//Serial.println("** no more files **");
break;
}
printSpaces(numSpaces);
Serial.print(entry.name());
if (entry.isDirectory()) {
Serial.println("/");
printDirectory(entry, numSpaces+2);
} else {
// files have sizes, directories do not
printSpaces(36 - numSpaces - strlen(entry.name()));
Serial.print(" ");
Serial.println(entry.size(), DEC);
}
entry.close();
}
}
void printSpaces(int num) {
for (int i=0; i < num; i++) {
Serial.print(" ");
}
}