esp-idf/examples/storage/custom_flash_driver/README.md

Supported Targets	ESP32	ESP32-C2	ESP32-C3	ESP32-C6	ESP32-H2	ESP32-P4	ESP32-S2	ESP32-S3

Custom Flash Driver Example

This example shows how to override the default chip driver list provided by IDF. Please make sure the SPI_FLASH_OVERRIDE_CHIP_DRIVER_LIST config option is enabled when you build this project (though it should already be enabled by default via sdkconfig.defaults). See the programming guide for more details regarding this feature.

CAUTION: This is only an example showing how to extend your own flash chip driver. Espressif doesn't guarantee the chip driver in the example is reliable for mass production, nor the reliability of the flash models that appear in this example. Please refer to the specification of your flash chip, or contact the flash vendor if you have any problems with the flash chip.

(See the README.md file in the upper level 'examples' directory for more information about examples.)

How to use example

Follow detailed instructions provided specifically for this example.

Select the instructions depending on Espressif chip installed on your development board:

• ESP32 Getting Started Guide
• ESP32-S2 Getting Started Guide

Example folder contents

The project custom_flash_driver contains one source file in C language main.c. The file is located in folder main.

The component custom_chip_driver placed under components folder, provides

ESP-IDF projects are built using CMake. The project build configuration is contained in CMakeLists.txt files that provide set of directives and instructions describing the project's source files and targets (executable, library, or both).

Below is short explanation of remaining files in the project folder.

├── CMakeLists.txt
├── sdkconfig.defaults         Default options to add into sdkconfig file (mainly to enable the SPI_FLASH_OVERRIDE_CHIP_DRIVER_LIST option)
├── example_test.py            Python script used for automated example testing
├── main
│   ├── CMakeLists.txt
│   ├── component.mk           Component make file
│   └── main.c
├── components/custom_chip_driver
│   ├── CMakeLists.txt
│   ├── component.mk           Component make file
│   ├── linker.lf              Linker script to put the customized chip driver into internal RAM
│   ├── project_include.cmake  Global cmake file to add dependency to spi_flash
│   ├── chip_drivers.c
│   └── spi_flash_chip_eon.c
├── Makefile                   Makefile used by legacy GNU Make
└── README.md                  This is the file you are currently reading

For more information on structure and contents of ESP-IDF projects, please refer to Section Build System of the ESP-IDF Programming Guide.

Troubleshooting

• Program upload failure

  • Hardware connection is not correct: run idf.py -p PORT monitor, and reboot your board to see if there are any output logs.
  • The baud rate for downloading is too high: lower your baud rate in the menuconfig menu, and try again.

Technical support and feedback

Please use the following feedback channels:

• For technical queries, go to the esp32.com forum
• For a feature request or bug report, create a GitHub issue

We will get back to you as soon as possible.