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7 years, 4 months ago.
About the time for SD card
Hi everyone. Thx for reading my question.
i would like to ask the question about time for SD card.
when i save the data the time always at 2028 1/1 just like below. 
i would like to fix it to the now's (time date) and next time when i save the data again if it can also automatically change the newest time. Another question is how can i use the newest date and time for my txt name automatically.
#include "mbed.h"
#include "SDFileSystem.h"
SDFileSystem sd(p5, p6, p7, p8, "sd"); // the pinout on the mbed Cool Components workshop board
int main() {
int i=0,j=1;
mkdir("/sd/mydir", 0777);
while(i<10){
FILE *fp = fopen("/sd/mydir/sdtest.txt", "a");
if(fp == NULL) {
error("Could not open file for write\n");
}
fprintf(fp,"%d\r\n",j);
fclose(fp);
i++;
}
}
Thx very much!!!
1 Answer
7 years, 4 months ago.
I use a 1768 with SD Card .This is my solution:
The SD software use the RTC clock : see developer.mbed.org/questions/2431/How-to-set-Date-and-Time-of-SD-file/
You have to start the RTC and provide a backup battery during power-off. see https://developer.mbed.org/handbook/Time
I hope this can help you