45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
|
/*------------------------------------------------------------/
|
||
|
|
/ Open or create a file in append mode
|
||
|
|
/ (This function was sperseded by FA_OPEN_APPEND flag at FatFs R0.12a)
|
||
|
|
/------------------------------------------------------------*/
|
||
|
|
|
||
|
|
FRESULT open_append (
|
||
|
|
FIL* fp, /* [OUT] File object to create */
|
||
|
|
const char* path /* [IN] File name to be opened */
|
||
|
|
)
|
||
|
|
{
|
||
|
|
FRESULT fr;
|
||
|
|
|
||
|
|
/* Opens an existing file. If not exist, creates a new file. */
|
||
|
|
fr = f_open(fp, path, FA_WRITE | FA_OPEN_ALWAYS);
|
||
|
|
if (fr == FR_OK) {
|
||
|
|
/* Seek to end of the file to append data */
|
||
|
|
fr = f_lseek(fp, f_size(fp));
|
||
|
|
if (fr != FR_OK)
|
||
|
|
f_close(fp);
|
||
|
|
}
|
||
|
|
return fr;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
int main (void)
|
||
|
|
{
|
||
|
|
FRESULT fr;
|
||
|
|
FATFS fs;
|
||
|
|
FIL fil;
|
||
|
|
|
||
|
|
/* Open or create a log file and ready to append */
|
||
|
|
f_mount(&fs, "", 0);
|
||
|
|
fr = open_append(&fil, "logfile.txt");
|
||
|
|
if (fr != FR_OK) return 1;
|
||
|
|
|
||
|
|
/* Append a line */
|
||
|
|
f_printf(&fil, "%02u/%02u/%u, %2u:%02u\n", Mday, Mon, Year, Hour, Min);
|
||
|
|
|
||
|
|
/* Close the file */
|
||
|
|
f_close(&fil);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|