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/*
* Write Example
*
* This sketch creates a new file and writes 100 lines to the file.
* No error checks on write in this example.
*/
#include <SdFat.h>
#include <SdFatUtil.h>
Sd2Card card;
SdVolume volume;
SdFile root;
SdFile file;
// store error strings in flash to save RAM
#define error(s) error_P(PSTR(s))
void error_P(const char* str) {
PgmPrint("error: ");
SerialPrintln_P(str);
if (card.errorCode()) {
PgmPrint("SD error: ");
Serial.print(card.errorCode(), HEX);
Serial.print(',');
Serial.println(card.errorData(), HEX);
}
while(1);
}
/*
* Write CR LF to a file
*/
void writeCRLF(SdFile& f) {
f.write((uint8_t*)"\r\n", 2);
}
/*
* Write an unsigned number to a file
*/
void writeNumber(SdFile& f, uint32_t n) {
uint8_t buf[10];
uint8_t i = 0;
do {
i++;
buf[sizeof(buf) - i] = n%10 + '0';
n /= 10;
} while (n);
f.write(&buf[sizeof(buf) - i], i);
}
/*
* Write a string to a file
*/
void writeString(SdFile& f, char *str) {
uint8_t n;
for (n = 0; str[n]; n++);
f.write((uint8_t *)str, n);
}
void setup(void) {
Serial.begin(9600);
Serial.println();
Serial.println("Type any character to start");
while (!Serial.available());
// initialize the SD card at SPI_HALF_SPEED to avoid bus errors with
// breadboards. use SPI_FULL_SPEED for better performance.
if (!card.init(SPI_HALF_SPEED)) error("card.init failed");
// initialize a FAT volume
if (!volume.init(&card)) error("volume.init failed");
// open the root directory
if (!root.openRoot(&volume)) error("openRoot failed");
// create a new file
char name[] = "WRITE00.TXT";
for (uint8_t i = 0; i < 100; i++) {
name[5] = i/10 + '0';
name[6] = i%10 + '0';
if (file.open(&root, name, O_CREAT | O_EXCL | O_WRITE)) break;
}
if (!file.isOpen()) error ("file.create");
Serial.print("Writing to: ");
Serial.println(name);
// write 100 line to file
for (uint8_t i = 0; i < 100; i++) {
writeString(file, "line ");
writeNumber(file, i);
writeString(file, " millis = ");
writeNumber(file, millis());
writeCRLF(file);
}
// close file and force write of all data to the SD card
file.close();
Serial.println("Done");
}
void loop(void) {}
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