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/*
* This sketch tests the dateTimeCallback() function
* and the timestamp() function.
*/
#include <SdFat.h>
#include <SdFatUtil.h> // use PgmPrint
/*
* date/time values for debug
* normally supplied by a real-time clock or GPS
*/
// date 2009-10-01 1-Oct-09
uint16_t year = 2009;
uint8_t month = 10;
uint8_t day = 1;
// time 20:30:40
uint8_t hour = 20;
uint8_t minute = 30;
uint8_t second = 40;
/*
* User provided date time callback function.
* See SdFile::dateTimeCallback() for usage.
*/
void dateTime(uint16_t* date, uint16_t* time) {
// User gets date and time from GPS or real-time
// clock in real callback function
// return date using FAT_DATE macro to format fields
*date = FAT_DATE(year, month, day);
// return time using FAT_TIME macro to format fields
*time = FAT_TIME(hour, minute, second);
}
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);
}
/*
* Function to print all timestamps.
*/
void printTimestamps(SdFile& f) {
dir_t d;
if (!f.dirEntry(&d)) error("f.dirEntry failed");
PgmPrint("Creation: ");
f.printFatDate(d.creationDate);
Serial.print(' ');
f.printFatTime(d.creationTime);
Serial.println();
PgmPrint("Modify: ");
f.printFatDate(d.lastWriteDate);
Serial.print(' ');
f.printFatTime(d.lastWriteTime);
Serial.println();
PgmPrint("Access: ");
f.printFatDate(d.lastAccessDate);
Serial.println();
}
void setup(void) {
Serial.begin(9600);
Serial.println();
PgmPrintln("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");
// remove files if they exist
SdFile::remove(&root, "CALLBACK.TXT");
SdFile::remove(&root, "DEFAULT.TXT");
SdFile::remove(&root, "STAMP.TXT");
// create a new file with default timestamps
if (!file.open(&root, "DEFAULT.TXT", O_CREAT | O_WRITE)) {
error("open DEFAULT.TXT failed");
}
Serial.println();
PgmPrintln("Open with default times");
printTimestamps(file);
// close file
file.close();
/*
* Test the date time callback function.
*
* dateTimeCallback() sets the function
* that is called when a file is created
* or when a file's directory entry is
* modified by sync().
*
* The callback can be disabled by the call
* SdFile::dateTimeCallbackCancel()
*/
// set date time callback function
SdFile::dateTimeCallback(dateTime);
// create a new file with callback timestamps
if (!file.open(&root, "CALLBACK.TXT", O_CREAT | O_WRITE)) {
error("open CALLBACK.TXT failed");
}
Serial.println();
PgmPrintln("Open with callback times");
printTimestamps(file);
// change call back date
day += 1;
// must add two to see change since FAT second field is 5-bits
second += 2;
// modify file by writing a byte
file.write('t');
// force dir update
file.sync();
Serial.println();
PgmPrintln("Times after write");
printTimestamps(file);
// close file
file.close();
/*
* Test timestamp() function
*
* Cancel callback so sync will not
* change access/modify timestamp
*/
SdFile::dateTimeCallbackCancel();
// create a new file with default timestamps
if (!file.open(&root, "STAMP.TXT", O_CREAT | O_WRITE)) {
error("open STAMP.TXT failed");
}
// set creation date time
if (!file.timestamp(T_CREATE, 2009, 11, 10, 1, 2, 3)) {
error("set create time failed");
}
// set write/modification date time
if (!file.timestamp(T_WRITE, 2009, 11, 11, 4, 5, 6)) {
error("set write time failed");
}
// set access date
if (!file.timestamp(T_ACCESS, 2009, 11, 12, 7, 8, 9)) {
error("set access time failed");
}
Serial.println();
PgmPrintln("Times after timestamp() calls");
printTimestamps(file);
file.close();
Serial.println();
PgmPrintln("Done");
}
void loop(void){}
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