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63 lines
1.5 KiB
C++

/*
* Append a line to a file - demo of pathnames and streams
*/
#include <SPI.h>
#include "SdFat.h"
// SD chip select pin
const uint8_t chipSelect = SS;
// file system object
SdFat sd;
// define a serial output stream
ArduinoOutStream cout(Serial);
//------------------------------------------------------------------------------
/*
* Append a line to logfile.txt
*/
void logEvent(const char *msg) {
// create dir if needed
sd.mkdir("logs/2014/Jan");
// create or open a file for append
ofstream sdlog("logs/2014/Jan/logfile.txt", ios::out | ios::app);
// append a line to the file
sdlog << msg << endl;
// check for errors
if (!sdlog) {
sd.errorHalt("append failed");
}
sdlog.close();
}
//------------------------------------------------------------------------------
void setup() {
Serial.begin(9600);
// Wait for USB Serial
while (!Serial) {
SysCall::yield();
}
// F() stores strings in flash to save RAM
cout << F("Type any character to start\n");
while (!Serial.available()) {
SysCall::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();
}
// append a line to the logfile
logEvent("Another line for the logfile");
cout << F("Done - check /logs/2014/Jan/logfile.txt on the SD") << endl;
}
//------------------------------------------------------------------------------
void loop() {}