59 lines
1.7 KiB
Arduino
59 lines
1.7 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 and the Arduino Print class
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* with SdFat.
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*/
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#include <SdFat.h>
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#include <SdFatUtil.h> // use functions to print strings from flash memory
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const uint8_t SD_CHIP_SELECT = SS;
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SdFat sd;
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SdFile file;
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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(void) {
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Serial.begin(9600);
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while (!Serial) {} // wait for Leonardo
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PgmPrintln("Type any character to start");
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while (Serial.read() <= 0) {}
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delay(200); // 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(SD_CHIP_SELECT, SPI_HALF_SPEED)) sd.initErrorHalt();
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char name[] = "APPEND.TXT";
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PgmPrint("Appending to: ");
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Serial.println(name);
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for (uint8_t i = 0; i < 100; i++) {
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// O_CREAT - create the file if it does not exist
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// O_APPEND - seek to the end of the file prior to each write
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// O_WRITE - open for write
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if (!file.open(name, O_CREAT | O_APPEND | O_WRITE)) {
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error("open failed");
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}
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// print 100 lines to file
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for (uint8_t j = 0; j < 100; j++) {
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file.print("line ");
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file.print(j, DEC);
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file.print(" of pass ");
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file.print(i, DEC);
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file.print(" millis = ");
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file.println(millis());
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}
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if (file.writeError) error("write failed");
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if (!file.close()) error("close failed");
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if (i > 0 && i%25 == 0) Serial.println();
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Serial.write('.');
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}
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Serial.println();
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Serial.println("Done");
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}
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void loop(void){}
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