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]

Okay. I think I see now. In our SDK we don't use timestamps in the Fatfs library, and AFAIK we haven't done any testing with these timestamps either. This is an external library, and I have not been able to find where the time of day is set when _FS_NORTC is set to 1, so I'm afraid what help I can provide is rather limited...

From ff.h: If the system does not have an RTC function or a valid timestamp is not needed, _FS_NORTC = 1 is set to disable the timestamp function (so you won't be able to get the current time like this). If _FS_NORTC = 1 all objects will have a fixed timestamp defined by the _NORTC_MON, _NORTC_MDAY and _NORTC_YEAR. To enable timestamp functionalities, the get_fattime() function needs to be added to the project and you'll have to get the current time from a real-time clock.

Best regards,

Simon

[Michael Jang]

Hi Simonr

I got the solution by changing GET_FATTIME()  like following.

Thanks.

 

 #define GET_FATTIME()   ((DWORD)(year - 1980) << 25 | (DWORD)month << 21 | day << 16 | hour << 11 | minute << 5)