ESP32 Spiffs Example Save

Example of using SPIFFS with modified esp_idf spiffs VFS driver

esp-idf has support for the spiffs file system, but the directory support is not implemented.

This example uses the modified spiffs VFS driver which enables the directory support.

The original esp-idf spiffs driver is modified in a way that directories are enabled.

To enable the new spiffs driver, spiffs directory from esp-idf components directory is copied to the project's components directory.

Only the esp_spiffs.c file was modified to enable directory support.

The standard mkdir() and rmdir() functions are added to the spiffs VFS driver.

The modified version of mkspiffs is also provided which supports building spiffs file system image with directories.

Features

• directory handling enabled
• example of directory list functions
• example of file copy functions

When using file related functions which has filename argument, prefix /spiffs/ has to be added to the file name.

How to build

Configure your esp32 build environment as for other esp-idf examples

Clone the repository

git clone https://github.com/loboris/ESP32_spiffs_example.git

Execute menuconfig and configure your Serial flash config and other settings. Included sdkconfig.defaults sets some defaults to be used.

Navigate to SPIffs Example Configuration and set SPIFFS options.

Select if you want to use wifi (recommended) to get the time from NTP server and set your WiFi SSID and password.

make menuconfig

Make and flash the example.

make all && make flash

Prepare SPIFFS image

Build mkspiffs

Before the image can be prepared, the mkspiffs executable must be created.
The sdkconfig.h is used in build process!
Before building, copy the sdkconfig.h from build/include directory to components/mkspiffs/include.
Change the working directory to components/mkspiffs/include.
Execute:

make clean
make

The simple build_mkspiffs script is provided which executes all the necessary steps automatically, just execute

./build_mkspiffs

Important: whenever you change spiffs configuration using menuconfig you must rebuild mkspiffs

It is not required to prepare the image, as the spiffs will be automatically formated on first use, but it might be convenient.

SFPIFFS image can be prepared on host and flashed to ESP32.

Copy the files to be included on spiffs into components/spiffs_image/image/ directory. Subdirectories can also be added.

Execute:

make makefs

to create spiffs image in build directory without flashing to ESP32

Execute:

make flashfs

to create spiffs image in build directory and flash it to ESP32

Example functions

• get the time from NTP server and set the system time (if WiFi is enabled)
• register spiffs as VFS file system; if the fs is not formated (1st start) it will be formated and mounted
• perform some file system tests
  • write text to file
  • read the file back
  • make directory
  • copy file from root to the new directory
  • remove file from new directory
  • remove the new directory
  • list files in root directory and subdirectories
  • perform timing test
  • perform multitask test (if enabled in menuconfig)

Example output:

I (4221) [SPIFFS example]: ==== STARTING SPIFFS TEST ====

=======================
==== Write to file ====
=======================
  file: "/spiffs/test.txt"
  351 bytes written

========================
==== Read from file ====
========================
  file: "/spiffs/test.txt"
  351 bytes read [
ESP32 spiffs write to file, line 1
ESP32 spiffs write to file, line 2
ESP32 spiffs write to file, line 3
ESP32 spiffs write to file, line 4
ESP32 spiffs write to file, line 5
ESP32 spiffs write to file, line 6
ESP32 spiffs write to file, line 7
ESP32 spiffs write to file, line 8
ESP32 spiffs write to file, line 9
ESP32 spiffs write to file, line 10

]

=================================================
==== Read from file included in sfiffs image ====
=================================================
  file: "/spiffs/spiffs.info"
  405 bytes read [
INTRODUCTION

Spiffs is a file system intended for SPI NOR flash devices on embedded targets.
Spiffs is designed with following characteristics in mind:

  * Small (embedded) targets, sparse RAM without heap
  * Only big areas of data (blocks) can be erased
  * An erase will reset all bits in block to ones
  * Writing pulls one to zeroes
  * Zeroes can only be pulled to ones by erase
  * Wear leveling

]

=============================
==== List root directory ====
=============================

List of Directory [/spiffs/]
-----------------------------------
T  Size      Date/Time         Name
-----------------------------------
d         -  07/06/2018 10:59  images
f       405  07/06/2018 10:59  spiffs.info
f       351  07/06/2018 10:59  test.txt
-----------------------------------
        756 in 2 file(s)
-----------------------------------
SPIFFS: free 758 KB of 934 KB
-----------------------------------

============================
==== Make new directory ====
============================
  dir: "/spiffs/newdir"
  Directory created
  Copy file from root to new directory...
  List the new directory

List of Directory [/spiffs/newdir]
-----------------------------------
T  Size      Date/Time         Name
-----------------------------------
f       351  07/06/2018 10:59  test.txt.copy
-----------------------------------
        351 in 1 file(s)
-----------------------------------
SPIFFS: free 757 KB of 934 KB
-----------------------------------

  List root directory, the "newdir" should be listed

List of Directory [/spiffs/]
-----------------------------------
T  Size      Date/Time         Name
-----------------------------------
d         -  07/06/2018 10:59  images
f       405  07/06/2018 10:59  spiffs.info
f       351  07/06/2018 10:59  test.txt
d         -  07/06/2018 10:59  newdir
-----------------------------------
        756 in 2 file(s)
-----------------------------------
SPIFFS: free 757 KB of 934 KB
-----------------------------------

  Try to remove non empty directory...
  Error removing directory (90) Directory not empty
  Removing file from new directory...
  Removing directory...
  List root directory, the "newdir" should be gone

List of Directory [/spiffs/]
-----------------------------------
T  Size      Date/Time         Name
-----------------------------------
d         -  07/06/2018 10:59  images
f       405  07/06/2018 10:59  spiffs.info
f       351  07/06/2018 10:59  test.txt
-----------------------------------
        756 in 2 file(s)
-----------------------------------
SPIFFS: free 758 KB of 934 KB
-----------------------------------


================================================
==== List content of the directory "images" ====
==== which is included on spiffs image      ====
================================================

List of Directory [/spiffs/images]
-----------------------------------
T  Size      Date/Time         Name
-----------------------------------
d         -  07/06/2018 10:59  test
f     39310  07/06/2018 10:59  test1.jpg
f     50538  07/06/2018 10:59  test2.jpg
f     47438  07/06/2018 10:59  test4.jpg
-----------------------------------
     137286 in 3 file(s)
-----------------------------------
SPIFFS: free 758 KB of 934 KB
-----------------------------------

==============================================================
==== Get the timings of spiffs operations
==== Operation:
====   Open file for writting, append 1 byte, close file
====   Open file for readinging, read 8 bytes, close file
==== 2 ms sleep between operations
==== 1000 operations will be executed
==============================================================
I (9028) Test: Started.
I (9498) Test: 100 reads/writes
I (9918) Test: 200 reads/writes
I (10346) Test: 300 reads/writes
I (10779) Test: 400 reads/writes
I (11209) Test: 500 reads/writes
I (11645) Test: 600 reads/writes
I (12079) Test: 700 reads/writes
I (12511) Test: 800 reads/writes
I (12945) Test: 900 reads/writes
I (13376) Test: 1000 reads/writes
W (13376) Test: Min write time: 2523 us
W (13376) Test: Max write time: 2987 us
W (13377) Test: Min read  time: 327 us
W (13382) Test: Max read  time: 462 us
W (13386) Test: Total run time: 4348 ms
I (13391) Test: Finished


List of Directory [/spiffs/]
-----------------------------------
T  Size      Date/Time         Name
-----------------------------------
d         -  07/06/2018 10:59  images
f       405  07/06/2018 10:59  spiffs.info
f       351  07/06/2018 10:59  test.txt
f      1001  07/06/2018 10:59  testfil3.txt
-----------------------------------
       1757 in 3 file(s)
-----------------------------------
SPIFFS: free 756 KB of 934 KB
-----------------------------------


====================================================
STARTING MULTITASK TEST (3 tasks created)
Operation:
  Open file for writting, append 1 byte, close file
  Open file for readinging, read 8 bytes, close file
2 ms sleep between operations
Each task will perform 1000 operations
Expected run time 40~100 seconds
====================================================
I (14970) [TASK_1]: Started.
I (15170) [TASK_2]: Started.
I (15350) [TASK_1]: 100 reads/writes
I (15370) [TASK_3]: Started.
I (15840) [TASK_2]: 100 reads/writes
I (16220) [TASK_1]: 200 reads/writes
I (16340) [TASK_3]: 100 reads/writes
I (16722) [TASK_2]: 200 reads/writes
I (17149) [TASK_1]: 300 reads/writes
I (17295) [TASK_3]: 200 reads/writes
I (17644) [TASK_2]: 300 reads/writes
I (18055) [TASK_1]: 400 reads/writes
I (18295) [TASK_3]: 300 reads/writes
I (18573) [TASK_2]: 400 reads/writes
I (18999) [TASK_1]: 500 reads/writes
I (19308) [TASK_3]: 400 reads/writes
I (20023) [TASK_2]: 500 reads/writes
I (21294) [TASK_1]: 600 reads/writes
I (21900) [TASK_3]: 500 reads/writes
I (22153) [TASK_2]: 600 reads/writes
I (22577) [TASK_1]: 700 reads/writes
I (22829) [TASK_3]: 600 reads/writes
I (23086) [TASK_2]: 700 reads/writes
I (23541) [TASK_1]: 800 reads/writes
I (23731) [TASK_3]: 700 reads/writes
I (24002) [TASK_2]: 800 reads/writes
I (24417) [TASK_1]: 900 reads/writes
I (24699) [TASK_3]: 800 reads/writes
I (24932) [TASK_2]: 900 reads/writes
I (25308) [TASK_1]: 1000 reads/writes
I (25308) [TASK_1]: Finished
I (25669) [TASK_3]: 900 reads/writes
I (26083) [TASK_2]: 1000 reads/writes
I (26083) [TASK_2]: Finished
I (26875) [TASK_3]: 1000 reads/writes
W (26875) [TASK_3]: Min write time: 2553 us
W (26875) [TASK_3]: Max write time: 154609 us
W (26878) [TASK_3]: Min read  time: 337 us
W (26883) [TASK_3]: Max read  time: 144128 us
W (26888) [TASK_3]: Total run time: 57729 ms
I (26893) [TASK_3]: Finished


List of Directory [/spiffs/]
-----------------------------------
T  Size      Date/Time         Name
-----------------------------------
f      1001  07/06/2018 11:00  testfil2.txt
f       405  07/06/2018 10:59  spiffs.info
f      1001  07/06/2018 11:00  testfil3.txt
d         -  07/06/2018 10:59  images
f      1001  07/06/2018 11:00  testfil1.txt
f       351  07/06/2018 10:59  test.txt
-----------------------------------
       3759 in 5 file(s)
-----------------------------------
SPIFFS: free 754 KB of 934 KB
-----------------------------------


Total multitask test run time: 60 seconds

I (28870) [SPIFFS example]: ==== SPIFFS TEST FINISHED ====