TinyFS

TinyFS contains Go implementations of embedded filesystems. The packages in this module require CGo support and are TinyGo compatible.

Supported hardware

You can use TinyFS with the following embedded hardware configurations:

Onboard Flash memory

You can use TinyFS on processors that have onboard Flash memory in the area above where the compiled TinyGo program is running.

External Flash memory

You can use TinyFS on an external Flash memory chip connected via SPI/QSPI hardware interface.

See https://github.com/tinygo-org/drivers/tree/release/flash

SD card connected via SPI/QPI

You can use TinyFS on an SD card connected via SPI/QSPI hardware interface.

See https://github.com/tinygo-org/drivers/tree/release/sdcard

LittleFS

The LittleFS file system is specifically designed for embedded applications.

See https://github.com/littlefs-project/littlefs for more information.

Example

This example runs on the RP2040 using the on-board flash in the available memory above where the program code itself is running:

$ tinygo flash -target pico -monitor ./examples/console/littlefs/machine/
Connected to /dev/ttyACM0. Press Ctrl-C to exit.
SPI Configured. Reading flash info
==> lsblk

-------------------------------------
 Device Information:  
-------------------------------------
 flash data start: 10017000
 flash data end:  10200000
-------------------------------------

==> format
Successfully formatted LittleFS filesystem.

==> mount
Successfully mounted LittleFS filesystem.

==> ls
==> samples
wrote 90 bytes to file0.txt
wrote 90 bytes to file1.txt
wrote 90 bytes to file2.txt
wrote 90 bytes to file3.txt
wrote 90 bytes to file4.txt
==> ls
-rwxrwxrwx    90 file0.txt
-rwxrwxrwx    90 file1.txt
-rwxrwxrwx    90 file2.txt
-rwxrwxrwx    90 file3.txt
-rwxrwxrwx    90 file4.txt
==> cat file3.txt
00000000: 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f     !"#$%&'()*+,-./
00000010: 30 31 32 33 34 35 36 37 38 39 3a 3b 3c 3d 3e 3f    0123456789:;<=>?
00000020: 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f    @ABCDEFGHIJKLMNO
00000030: 50 51 52 53 54 55 56 57 58 59 5a 5b 5c 5d 5e 5f    PQRSTUVWXYZ[\]^_
00000040: 60 61 62 63 64 65 66 67 68 69 6a 6b 6c 6d 6e 6f    `abcdefghijklmno
00000050: 70 71 72 73 74 75 76 77 78 79                      pqrstuvwxy

After unplugging and reconnecting the RP2040 device (a hard restart):

$ tinygo monitor
Connected to /dev/ttyACM0. Press Ctrl-C to exit.
SPI Configured. Reading flash info
==> mount
Successfully mounted LittleFS filesystem.

==> ls
-rwxrwxrwx    90 file0.txt
-rwxrwxrwx    90 file1.txt
-rwxrwxrwx    90 file2.txt
-rwxrwxrwx    90 file3.txt
-rwxrwxrwx    90 file4.txt
==> cat file3.txt
00000000: 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f     !"#$%&'()*+,-./
00000010: 30 31 32 33 34 35 36 37 38 39 3a 3b 3c 3d 3e 3f    0123456789:;<=>?
00000020: 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f    @ABCDEFGHIJKLMNO
00000030: 50 51 52 53 54 55 56 57 58 59 5a 5b 5c 5d 5e 5f    PQRSTUVWXYZ[\]^_
00000040: 60 61 62 63 64 65 66 67 68 69 6a 6b 6c 6d 6e 6f    `abcdefghijklmno
00000050: 70 71 72 73 74 75 76 77 78 79                      pqrstuvwxy

FAT FS

The FAT file system is not currently working, due to tinygo-org/tinygo#3460.