DescriptionThis function opens a file on the SD card or create it if doesn't exist.
SD.open(filepath) SD.open(filepath, mode)
- filename: the name the file to open, which can include directories (delimited by forward slashes, /) - char *
- mode (optional): the mode in which to open the file, defaults to FILE_READ - byte. one of:
FILE_READ: open the file for reading, starting at the beginning of the file.
FILE_WRITE: open the file for reading and writing, starting at the end of the file.