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Espressif IoT Development Framework. Official development framework for Espressif SoCs. https://docs.espressif.com/projects/esp-idf/en/stable/esp32/index.html
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qiyuexia 1692896e5e mesh: add channel switch function 
1. add network channel switch function.
   - users can obtain the new channel through the event MESH_EVENT_CHANNEL_SWITCH.
   - the entire network will be moved to the same channel as the router without user intervention.
   - if no router is in the network, users can call esp_mesh_switch_channel() on the root side to
     move the entire network　to their desired channel.
2. support not configuring the network channel.
3. support not configuring the router BSSID even if the router is hidden.
4. add allow_channel_switch to mesh configuration.
   - if the channel is not specified, this value will be ignored.
   - if the channel is specified and this value is set, when "fail" (mesh_attempts_t) times of parent selection
     or look for networks are reached, device will change to perform a full channel scan for networks that could join.
   - if the channel is specified and this value is set to 0, when a root is not elected, channel switch is not allowed.
     but when a root appears, the root performs a full channel scan during the process of connecting to the router,
     so even allow_channel_switch is set to 0, the root may still switch channel and eventually the entire network
    changes channel.
5. add allow_router_switch to mesh router configuration.
   - if the BSSID of router is not specified, this value will be ignored.
   - if the BSSID of router is specified and this value is set, when the router of this specified BSSID fails to be found
     after　"fail" (mesh_attempts_t) times, the entire network is allowed to switch to another router with the same SSID.
6. modify the root to perform a full channel scan when esp_wifi_connect().
7. support handling beacon without DS Paramter Set.
2018-11-27 23:36:01 +08:00
components mesh: add channel switch function 2018-11-27 23:36:01 +08:00
docs mesh: add channel switch function 2018-11-27 23:36:01 +08:00
examples mesh: add channel switch function 2018-11-27 23:36:01 +08:00
make ldgen: Fix ENOENT errors on Windows with MSYS2 and GNU Make 2018-11-20 17:25:20 +11:00
tools Merge branch 'bugfix/spiram_80m_clk_config' into 'master' 2018-11-25 22:25:19 +08:00
.editorconfig cmake: Use cmake_lint project, tidy up all CMake source files 2018-04-30 09:59:20 +10:00
.gitignore Sign IDF Tools installer with 'osslsigncode', update to V1.2 2018-10-18 09:56:16 +11:00
.gitlab-ci.yml Merge branch 'bugfix/spiram_80m_clk_config' into 'master' 2018-11-25 22:25:19 +08:00
.gitmodules unity: separate common and IDF specific functionality 2018-11-19 12:36:31 +08:00
add_path.sh docs, scripts: Correct the priority of the PATH setting 2018-09-27 14:55:37 +08:00
CONTRIBUTING.rst docs: Add "Creating Examples" docs page, template example README 2018-06-14 16:49:22 +10:00
Kconfig build system: support for multiple targets 2018-11-11 21:46:02 +08:00
LICENSE Initial public version 2016-08-17 23:08:22 +08:00
README.md Docs: Renamed download links to clearly state they are to download documentation. Fixed incorrectly linked documentation build badge. 2018-09-17 01:19:45 +00:00
requirements.txt tools: install pyparsing using pip 2018-11-22 09:55:31 +08:00

README.md

Espressif IoT Development Framework

Documentation Status

ESP-IDF is the official development framework for the ESP32 chip.

Developing With ESP-IDF

Setting Up ESP-IDF

See setup guides for detailed instructions to set up the ESP-IDF:

Finding a Project

As well as the esp-idf-template project mentioned in Getting Started, ESP-IDF comes with some example projects in the examples directory.

Once you've found the project you want to work with, change to its directory and you can configure and build it.

To start your own project based on an example, copy the example project directory outside of the ESP-IDF directory.

Quick Reference

See the Getting Started guide links above for a detailed setup guide. This is a quick reference for common commands when working with ESP-IDF projects:

Configuring the Project

make menuconfig

  • Opens a text-based configuration menu for the project.
  • Use up & down arrow keys to navigate the menu.
  • Use Enter key to go into a submenu, Escape key to go out or to exit.
  • Type ? to see a help screen. Enter key exits the help screen.
  • Use Space key, or Y and N keys to enable (Yes) and disable (No) configuration items with checkboxes "[*]"
  • Pressing ? while highlighting a configuration item displays help about that item.
  • Type / to search the configuration items.

Once done configuring, press Escape multiple times to exit and say "Yes" to save the new configuration when prompted.

Compiling the Project

make -j4 all

... will compile app, bootloader and generate a partition table based on the config.

NOTE: The -j4 option causes make to run 4 parallel jobs. This is much faster than the default single job. The recommended number to pass to this option is -j(number of CPUs + 1).

Flashing the Project

When the build finishes, it will print a command line to use esptool.py to flash the chip. However you can also do this automatically by running:

make -j4 flash

This will flash the entire project (app, bootloader and partition table) to a new chip. The settings for serial port flashing can be configured with make menuconfig.

You don't need to run make all before running make flash, make flash will automatically rebuild anything which needs it.

Viewing Serial Output

The make monitor target uses the idf_monitor tool to display serial output from the ESP32. idf_monitor also has a range of features to decode crash output and interact with the device. Check the documentation page for details.

Exit the monitor by typing Ctrl-].

To build, flash and monitor output in one pass, you can run:

make -j4 flash monitor

Compiling & Flashing Only the App

After the initial flash, you may just want to build and flash just your app, not the bootloader and partition table:

  • make app - build just the app.
  • make app-flash - flash just the app.

make app-flash will automatically rebuild the app if any source files have changed.

(In normal development there's no downside to reflashing the bootloader and partition table each time, if they haven't changed.)

Parallel Builds

ESP-IDF supports compiling multiple files in parallel, so all of the above commands can be run as make -jN where N is the number of parallel make processes to run (generally N should be equal to the number of CPU cores in your system, plus one.)

Multiple make functions can be combined into one. For example: to build the app & bootloader using 5 jobs in parallel, then flash everything, and then display serial output from the ESP32 run:

make -j5 flash monitor

The Partition Table

Once you've compiled your project, the "build" directory will contain a binary file with a name like "my_app.bin". This is an ESP32 image binary that can be loaded by the bootloader.

A single ESP32's flash can contain multiple apps, as well as many different kinds of data (calibration data, filesystems, parameter storage, etc). For this reason a partition table is flashed to offset 0x8000 in the flash.

Each entry in the partition table has a name (label), type (app, data, or something else), subtype and the offset in flash where the partition is loaded.

The simplest way to use the partition table is to make menuconfig and choose one of the simple predefined partition tables:

  • "Single factory app, no OTA"
  • "Factory app, two OTA definitions"

In both cases the factory app is flashed at offset 0x10000. If you make partition_table then it will print a summary of the partition table.

For more details about partition tables and how to create custom variations, view the docs/en/api-guides/partition-tables.rst file.

Erasing Flash

The make flash target does not erase the entire flash contents. However it is sometimes useful to set the device back to a totally erased state, particularly when making partition table changes or OTA app updates. To erase the entire flash, run make erase_flash.

This can be combined with other targets, ie make erase_flash flash will erase everything and then re-flash the new app, bootloader and partition table.

Resources