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docs: README write to file example; reminder to run file.flush() #174

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13 changes: 13 additions & 0 deletions README.md
Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,19 @@ while !my_file.is_eof() {
}
```

For writing files:

```rust
let my_other_file = root_dir.open_file_in_dir("MY_DATA.CSV", embedded_sdmmc::Mode::ReadWriteCreateOrAppend)?;
my_other_file.write(b"Timestamp,Signal,Value\n")?;
my_other_file.write(b"2025-01-01T00:00:00Z,TEMP,25.0\n")?;
my_other_file.write(b"2025-01-01T00:00:01Z,TEMP,25.1\n")?;
my_other_file.write(b"2025-01-01T00:00:02Z,TEMP,25.2\n")?;

// Don't forget to flush the file so that the directory entry is updated
my_other_file.flush()?;
```

### Open directories and files

By default the `VolumeManager` will initialize with a maximum number of `4` open directories, files and volumes. This can be customized by specifying the `MAX_DIR`, `MAX_FILES` and `MAX_VOLUMES` generic consts of the `VolumeManager`:
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