64 lines
1.8 KiB
Arduino
64 lines
1.8 KiB
Arduino
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/*
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* Append Example
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*
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* This sketch shows how to use open for append.
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* The sketch will append 100 line each time it opens the file.
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* The sketch will open and close the file 100 times.
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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;
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// file system object
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SdFat sd;
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// create Serial stream
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ArduinoOutStream cout(Serial);
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// store error strings in flash to save RAM
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#define error(s) sd.errorHalt_P(PSTR(s))
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//------------------------------------------------------------------------------
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void setup() {
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// filename for this example
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char name[] = "APPEND.TXT";
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Serial.begin(9600);
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while (!Serial) {} // wait for Leonardo
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// pstr() stores strings in flash to save RAM
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cout << endl << pstr("Type any character to start\n");
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while (Serial.read() <= 0) {}
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delay(400); // Catch Due reset problem
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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.begin(chipSelect, SPI_HALF_SPEED)) sd.initErrorHalt();
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cout << pstr("Appending to: ") << name;
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for (uint8_t i = 0; i < 100; i++) {
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// open stream for append
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ofstream sdout(name, ios::out | ios::app);
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if (!sdout) error("open failed");
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// append 100 lines to the file
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for (uint8_t j = 0; j < 100; j++) {
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// use int() so byte will print as decimal number
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sdout << "line " << int(j) << " of pass " << int(i);
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sdout << " millis = " << millis() << endl;
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}
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// close the stream
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sdout.close();
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if (!sdout) error("append data failed");
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// output progress indicator
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if (i % 25 == 0) cout << endl;
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cout << '.';
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}
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cout << endl << "Done" << endl;
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}
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//------------------------------------------------------------------------------
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void loop() {}
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