1 # Espressif IoT Development Framework
3 [![alt text](https://readthedocs.org/projects/docs/badge/?version=latest "Documentation Status")](http://esp-idf.readthedocs.io/en/latest/?badge=latest)
5 ESP-IDF is the official development framework for the `ESP32 <https://espressif.com/en/products/hardware/esp32/overview>`_ chip.
7 # Developing With the ESP-IDF
11 See setup guides for detailed instructions to set up the ESP-IDF:
13 * [Windows Setup Guide](http://esp-idf.readthedocs.io/en/latest/windows-setup.html)
14 * [Mac OS Setup Guide](http://esp-idf.readthedocs.io/en/latest/macos-setup.html)
15 * [Linux Setup Guide](http://esp-idf.readthedocs.io/en/latest/linux-setup.html)
19 As well as the [esp-idf-template](https://github.com/espressif/esp-idf-template) project mentioned in the setup guide, ESP-IDF comes with some example projects in the [examples](examples) directory.
21 Once you've found the project you want to work with, change to its directory and you can configure and build it.
23 ## Configuring the Project
27 ## Compiling the Project
31 ... will compile app, bootloader and generate a partition table based on the config.
33 ## Flashing the Project
35 When `make all` finishes, it will print a command line to use esptool.py to flash the chip. However you can also do this from make by running:
39 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`.
41 You don't need to run `make all` before running `make flash`, `make flash` will automatically rebuild anything which needs it.
43 ## Viewing Serial Output
45 The `make monitor` target will use the already-installed [miniterm](http://pyserial.readthedocs.io/en/latest/tools.html#module-serial.tools.miniterm) (a part of pyserial) to display serial output from the ESP32 on the terminal console.
47 Exit miniterm by typing Ctrl-].
49 To flash and monitor output in one pass, you can run:
53 ## Compiling & Flashing Just the App
55 After the initial flash, you may just want to build and flash just your app, not the bootloader and partition table:
57 * `make app` - build just the app.
58 * `make app-flash` - flash just the app.
60 `make app-flash` will automatically rebuild the app if it needs it.
62 (There's no downside to reflashing the bootloader and partition table each time, if they haven't changed.)
66 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 or one more than the number of CPU cores in your system.)
68 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:
71 make -j5 flash monitor
74 ## The Partition Table
76 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.
78 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 0x4000 in the flash.
80 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.
82 The simplest way to use the partition table is to `make menuconfig` and choose one of the simple predefined partition tables:
84 * "Single factory app, no OTA"
85 * "Factory app, two OTA definitions"
87 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.
89 For more details about partition tables and how to create custom variations, view the `docs/partition-tables.rst` file.
93 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`.
95 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.
99 * Documentation for the latest version: http://esp-idf.readthedocs.io/. This documentation is built from the [docs directory](docs) of this repository.
101 * The [esp32.com forum](http://esp32.com/) is a place to ask questions and find community resources.
103 * [Check the Issues section on github](https://github.com/espressif/esp-idf/issues) if you find a bug or have a feature request. Please check existing Issues before opening a new one.
105 * If you're interested in contributing to ESP-IDF, please check the [Contributions Guide](http://esp-idf.readthedocs.io/en/latest/contributing.html>).