86 lines
2 KiB
Arduino
86 lines
2 KiB
Arduino
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// This example is really out of date so best to ignore it
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// It is still here to create files for other tests.
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/*
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* Write Example
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*
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* This sketch creates a new file and writes 100 lines to the file.
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* No error checks on write in this example.
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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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* Write CR LF to a file
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*/
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void writeCRLF(SdFile& f) {
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f.write((uint8_t*)"\r\n", 2);
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}
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/*
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* Write an unsigned number to a file
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*/
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void writeNumber(SdFile& f, uint32_t n) {
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uint8_t buf[10];
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uint8_t i = 0;
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do {
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i++;
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buf[sizeof(buf) - i] = n % 10 + '0';
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n /= 10;
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} while (n);
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f.write(&buf[sizeof(buf) - i], i);
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}
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/*
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* Write a string to a file
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*/
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void writeString(SdFile& f, char *str) {
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uint8_t n;
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for (n = 0; str[n]; n++);
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f.write((uint8_t *)str, n);
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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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// create a new file
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char name[] = "WRITE00.TXT";
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for (uint8_t i = 0; i < 100; i++) {
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name[5] = i/10 + '0';
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name[6] = i%10 + '0';
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if (file.open(name, O_CREAT | O_EXCL | O_WRITE)) break;
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}
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if (!file.isOpen()) error ("file.create");
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Serial.print("Writing to: ");
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Serial.println(name);
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// write 100 line to file
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for (uint8_t i = 0; i < 100; i++) {
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writeString(file, "line ");
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writeNumber(file, i);
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writeString(file, " millis = ");
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writeNumber(file, millis());
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writeCRLF(file);
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}
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// close file and force write of all data to the SD card
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file.close();
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Serial.println("Done");
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}
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void loop(void) {}
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