How to set the date and time to the file on SD card or Flash disk on nRF52840

[Michael Jang]

Hi

I'm trying to file open and write for logging temperature data and others on nRF52840.

I successfully open, read and write on SD card or flash in nRF52840.

I also have used  nrf_cal_set_time(year, month-1, day, hour, minute, second) in nrf_calendar.c successfully.

It's a great and file to display date and time.

But, after file creation using f_open(), f_write() and f_close(), I found that the default date&time of the file is always 01/01/2016.

I appreciate that if you let us know what is wrong from my side and how to change or set the date & time of file property.

Thanks

Minsoo Jang

[Simonr]

Hi

It seems like you're calling the default time from the time.h library when you write to this file. Can you try setting a breakpoint at the point in time.h where the date 2016.01.01 is set to see where exactly it's called?

Best regards,

Simon

[Michael Jang]

Hi

Thank you very much for your reply.

I found Timestamp that there is function to set the date in ff.c like:

ff.c

/* Timestamp */
#if _FS_NORTC == 1
#if _NORTC_YEAR < 1980 || _NORTC_YEAR > 2107 || _NORTC_MON < 1 || _NORTC_MON > 12 || _NORTC_MDAY < 1 || _NORTC_MDAY > 31
#error Invalid _FS_NORTC settings
#endif
#define GET_FATTIME() ((DWORD)(_NORTC_YEAR - 1980) << 25 | (DWORD)_NORTC_MON << 21 | (DWORD)_NORTC_MDAY << 16)
#else
#define GET_FATTIME() get_fattime()
#endif

ffconf.h

#define _FS_NORTC 1
#define _NORTC_MON 1
#define _NORTC_MDAY 1
#define _NORTC_YEAR 2016

So, I changed and made new get_fattime() in main.c  like following:

main.c

...

DWORD get_fattime(void)
{
DWORD date_value;
DWORD year;
DWORD month;
DWORD day;

year = (DWORD)mRTC_Timer.tm_year;
month = (DWORD)mRTC_Timer.tm_mon;
day = (DWORD)mRTC_Timer.tm_mday;

if (year < 1980 || year > 2107 || month < 1 || month > 12 || day < 1 || day > 31 )
{
      month = 1;
      day = 1;
      year = 2021;
      printf("Time data is broken, set to default value!!!\r\n");

}

date_value = ((DWORD)(year - 1980) << 25 | (DWORD)month << 21 | day << 16);

return date_value;

}

It's working successfully by updating to new RTC date for opened file whenever it opens  and write file using f_open() and f_write().

But, the time of modified file is always 12:00 AM like following:

temper.csv 2021-03-29 AM 12:00

I appreciate if you let me know how to set time value other than date for Timestamp:

I'm sure we could use and add time value for this function

GET_FATTIME() ((DWORD)(_NORTC_YEAR - 1980) << 25 | (DWORD)_NORTC_MON << 21 | (DWORD)_NORTC_MDAY << 16)

Thanks in advance

Michael Jang

[Simonr]

Hi

Seems like the time is called from somewhere else in your application, please try finding out where the time is called from, as it doesn't look like GET_FATTIME is able to provide the time of day.

Best regards,

Simon