void logInit() {
// initialize the SD card
if (!card.init()) {
Serial.print("Error initializing card - ");
Serial.println(card.errorCode, HEX);
return;
}
// initialize a FAT16 volume
if (!Fat16::init(&card)) {
Serial.println("Can't initialize volume.");
return;
}
// create a new file
char name[] = "LOGGER00.TXT";
for (uint8_t i = 0; i < 100; i++) {
name[6] = i/10 + '0';
name[7] = i%10 + '0';
// O_CREAT - create the file if it does not exist
// O_EXCL - fail if the file exists
// O_WRITE - open for write only
if (file.open(name, O_CREAT | O_EXCL | O_WRITE)) break;
}
if (!file.isOpen()) {
Serial.println("Error creating log file.");
return;
}
Serial.print("Logging to: ");
Serial.println(name);
// write data header
// clear write error
file.writeError = false;
file.println("Started log.");
file.sync();
fileReady = 1;
}
void log(char *fmt, ... ) {
char buf[128]; // resulting string limited to 128 chars
va_list args;
va_start (args, fmt );
vsnprintf(buf, 128, fmt, args);
va_end (args);
if (serial_logging) {
Serial.print(gps_time);
Serial.print(':');
Serial.print(millis());
Serial.print(' ');
Serial.print(buf);
}
if (fileReady) {
file.print(gps_time);
file.print(':');
file.print(millis());
file.print(' ');
file.print(buf);
file.sync();
}
}