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63 lines
1.5 KiB
C++
63 lines
1.5 KiB
C++
/*
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* Append a line to a file - demo of pathnames and streams
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*/
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#include <SPI.h>
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#include "SdFat.h"
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// SD chip select pin
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const uint8_t chipSelect = SS;
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// file system object
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SdFat sd;
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// define a serial output stream
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ArduinoOutStream cout(Serial);
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//------------------------------------------------------------------------------
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/*
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* Append a line to logfile.txt
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*/
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void logEvent(const char *msg) {
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// create dir if needed
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sd.mkdir("logs/2014/Jan");
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// create or open a file for append
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ofstream sdlog("logs/2014/Jan/logfile.txt", ios::out | ios::app);
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// append a line to the file
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sdlog << msg << endl;
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// check for errors
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if (!sdlog) {
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sd.errorHalt("append failed");
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}
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sdlog.close();
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}
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//------------------------------------------------------------------------------
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void setup() {
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Serial.begin(9600);
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// Wait for USB Serial
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while (!Serial) {
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SysCall::yield();
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}
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// F() stores strings in flash to save RAM
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cout << F("Type any character to start\n");
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while (!Serial.available()) {
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SysCall::yield();
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}
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delay(400); // catch Due reset problem
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// Initialize at the highest speed supported by the board that is
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// not over 50 MHz. Try a lower speed if SPI errors occur.
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if (!sd.begin(chipSelect, SD_SCK_MHZ(50))) {
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sd.initErrorHalt();
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}
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// append a line to the logfile
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logEvent("Another line for the logfile");
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cout << F("Done - check /logs/2014/Jan/logfile.txt on the SD") << endl;
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}
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//------------------------------------------------------------------------------
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void loop() {}
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