/*------------------------------------------------------------/
/ Open or create a file in append mode
/------------------------------------------------------------*/
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;
}
#include "ff.h"
int main(void) {
FATFS fs;
FIL fil;
if (f_mount(&fs, "", 0) == FR_OK) {
if (f_open(&fil, "file.txt", FA_WRITE | FA_OPEN_ALWAYS) == FR_OK) {
if (f_lseek(&fil, f_size(&fil)) == FR_OK) {
f_puts("append", &fil);
}
}
f_close(&fil);
}
for (;;);
return 0;
}
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