52 lines
1.4 KiB
Plaintext
Executable File
52 lines
1.4 KiB
Plaintext
Executable File
/*
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* Append a line to a file - demo of pathnames and streams
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*/
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#include <SdFat.h>
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// SD chip select pin
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const uint8_t chipSelect = SS_PIN;
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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/2011/JAN");
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// create or open a file for append
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ofstream sdlog("LOGS/2011/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) sd.errorHalt("append failed");
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// file will be closed when sdlog goes out of scope
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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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// pstr stores strings in flash to save RAM
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cout << pstr("Type any character to start\n");
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while (Serial.read() < 0) {}
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// initialize the SD card at SPI_HALF_SPEED to avoid bus errors with
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// breadboards. use SPI_FULL_SPEED for better performance.
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if (!sd.init(SPI_HALF_SPEED, chipSelect)) sd.initErrorHalt();
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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 << "Done - check /LOGS/2011/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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