Example of using FAT with ESP32

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Features

• prepare of FAT image
• flash FAT image to ESP32
• example of FAT functions

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How to build

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

Clone the repository

git clone https://github.com/jkearins/ESP32_mkfatfs.git

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

make menuconfig

Make and flash the example.

make all && make flash && make flashfatfs

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Prepare FAT image

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

Tested and works under Windows, Linux and Mac OS.

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

Execute:

make makefatfs

to create FAT image in build directory without flashing to ESP32

Execute:

make flashfatfs

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

Execute:

make copyfatfs

to flash previously prepared in build directory FAT image to ESP32

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Example functions

• registers FAT as VFS file system; if the fs is not mounted the system will halt
• lists files in root directory

Example output:

I (399) cpu_start: Pro cpu up.
I (399) cpu_start: Starting app cpu, entry point is 0x40080e98
I (0) cpu_start: App cpu up.
I (402) heap_init: Initializing. RAM available for dynamic allocation:
I (417) heap_init: At 3FFAE2A0 len 00001D60 (7 KiB): DRAM
I (433) heap_init: At 3FFB3E60 len 0002C1A0 (176 KiB): DRAM
I (449) heap_init: At 3FFE0440 len 00003BC0 (14 KiB): D/IRAM
I (466) heap_init: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM
I (483) heap_init: At 40087D04 len 000182FC (96 KiB): IRAM
I (499) cpu_start: Pro cpu start user code
I (582) cpu_start: Starting scheduler on PRO CPU.
I (192) cpu_start: Starting scheduler on APP CPU.
I (192) FATFS: Mounting FAT partition...
I (195) FATFS: Done.
I (196) FATFS: ============= Begin of root contents
I (199) FATFS: 	ESP32Explorer.html              	   8332 bytes
I (202) FATFS: 	ESP32Explorer.js                	  11434 bytes
I (208) FATFS: 	<images>
I (210) FATFS: 	<jquery>
I (212) FATFS: 	<jQuery-File-Upload-9.18.0>
I (216) FATFS: 	<jqueryui>
I (218) FATFS: 	<jstree>
I (220) FATFS: ============= End of root contents

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Thanks

The tool is inspired by mkspiffs tool created by loboris and introduced at ESP32 Forum topic. To manage FATFS objects I used Kolban's cpp_utils from esp32-snippets project. Files for sample flash image have been gotten from another Kolban's project ESP32_Explorer introduced at ESP32 Forum topic.

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Donation

If this project help you reduce time to develop, you can give me a cup of coffee :)