1 /*------------------------------------------------------------/
2 / Open or create a file in append mode
3 / (This function was sperseded by FA_OPEN_APPEND flag at FatFs R0.12a)
4 /------------------------------------------------------------*/
5
open_append(FIL * fp,const char * path)6 FRESULT open_append (
7 FIL* fp, /* [OUT] File object to create */
8 const char* path /* [IN] File name to be opened */
9 )
10 {
11 FRESULT fr;
12
13 /* Opens an existing file. If not exist, creates a new file. */
14 fr = f_open(fp, path, FA_WRITE | FA_OPEN_ALWAYS);
15 if (fr == FR_OK) {
16 /* Seek to end of the file to append data */
17 fr = f_lseek(fp, f_size(fp));
18 if (fr != FR_OK)
19 f_close(fp);
20 }
21 return fr;
22 }
23
24
main(void)25 int main (void)
26 {
27 FRESULT fr;
28 FATFS fs;
29 FIL fil;
30
31 /* Open or create a log file and ready to append */
32 f_mount(&fs, "", 0);
33 fr = open_append(&fil, "logfile.txt");
34 if (fr != FR_OK) return 1;
35
36 /* Append a line */
37 f_printf(&fil, "%02u/%02u/%u, %2u:%02u\n", Mday, Mon, Year, Hour, Min);
38
39 /* Close the file */
40 f_close(&fil);
41
42 return 0;
43 }
44
45