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