version 2.8
app1.c
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 
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 
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