The f_putc funciton puts a character to the file.
int f_putc ( TCHAR Chr, /* A character to put */ FIL* FileObject /* File object */ );
When the character was written successfuly, the function returns 1. When the function failed due to disk full or any error, an EOF (-1) will be returned.
When the FatFs is configured to Unicode API (_LFN_UNICODE == 1), the UTF-16 character is written to the file in UTF-8 encoding. If not the case, the byte will be written directly.
The f_putc() is a wrapper function of f_write().
Available when _FS_READONLY == 0 and _USE_STRFUNC is 1 or 2. When it is set to 2, a '\n' is converted to "\r\n".