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# Espressif IoT Development Framework
[![alt text](https://readthedocs.org/projects/docs/badge/?version=latest "Documentation Status")](https://esp-idf.readthedocs.io/en/latest/?badge=latest)
[![alt text](https://readthedocs.org/projects/docs/badge/?version=latest "Documentation Status")](https://docs.espressif.com/projects/esp-idf/en/latest/?badge=latest)
ESP-IDF is the official development framework for the [ESP32](https://espressif.com/en/products/hardware/esp32/overview) chip.
# Developing With the ESP-IDF
# Developing With ESP-IDF
## Setting Up ESP-IDF
See setup guides for detailed instructions to set up the ESP-IDF:
* [Windows Setup Guide](https://esp-idf.readthedocs.io/en/latest/get-started/windows-setup.html)
* [Mac OS Setup Guide](https://esp-idf.readthedocs.io/en/latest/get-started/macos-setup.html)
* [Linux Setup Guide](https://esp-idf.readthedocs.io/en/latest/get-started/linux-setup.html)
* [Getting Started Guide for the stable ESP-IDF version](https://docs.espressif.com/projects/esp-idf/en/stable/get-started/)
* [Getting Started Guide for the latest (master branch) ESP-IDF version](https://docs.espressif.com/projects/esp-idf/en/latest/get-started/)
## Finding a Project
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.
As well as the [esp-idf-template](https://github.com/espressif/esp-idf-template) project mentioned in Getting Started, ESP-IDF comes with some example projects in the [examples](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
`idf.py menuconfig`
`make menuconfig`
* Opens a text-based configuration menu for the project.
* Use up & down arrow keys to navigate the menu.
@@ -36,41 +41,54 @@ Once done configuring, press Escape multiple times to exit and say "Yes" to save
## Compiling the Project
`idf.py build`
`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:
`idf.py flash`
`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 `idf.py menuconfig`.
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 `idf.py build` before running `idf.py flash`, `idf.py flash` will automatically rebuild anything which needs it.
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 `idf.py monitor` target uses the [idf_monitor tool](https://esp-idf.readthedocs.io/en/latest/get-started/idf-monitor.html) 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](https://esp-idf.readthedocs.io/en/latest/get-started/idf-monitor.html).
The `make monitor` target uses the [idf_monitor tool](https://docs.espressif.com/projects/esp-idf/en/latest/get-started/idf-monitor.html) 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](https://docs.espressif.com/projects/esp-idf/en/latest/get-started/idf-monitor.html).
Exit the monitor by typing Ctrl-].
To flash and monitor output in one pass, you can run:
To build, flash and monitor output in one pass, you can run:
`idf.py flash monitor`
`make -j4 flash monitor`
## Compiling & Flashing Just the App
## 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:
* `idf.py app` - build just the app.
* `idf.py app-flash` - flash just the app.
* `make app` - build just the app.
* `make app-flash` - flash just the app.
`idf.py app-flash` will automatically rebuild the app if it needs it.
`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.
@@ -79,29 +97,29 @@ A single ESP32's flash can contain multiple apps, as well as many different kind
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 `idf.py menuconfig` and choose one of the simple predefined partition tables:
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 `idf.py partition_table` then it will print a summary of the partition table.
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`](docs/en/api-guides/partition-tables.rst) file.
## Erasing Flash
The `idf.py 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 `idf.py erase_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 `idf.py erase_flash flash` will erase everything and then re-flash the new app, bootloader and partition table.
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
* Documentation for the latest version: https://esp-idf.readthedocs.io/. This documentation is built from the [docs directory](docs) of this repository.
* Documentation for the latest version: https://docs.espressif.com/projects/esp-idf/. This documentation is built from the [docs directory](docs) of this repository.
* The [esp32.com forum](https://esp32.com/) is a place to ask questions and find community resources.
* [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.
* If you're interested in contributing to ESP-IDF, please check the [Contributions Guide](https://esp-idf.readthedocs.io/en/latest/contribute/index.html).
* If you're interested in contributing to ESP-IDF, please check the [Contributions Guide](https://docs.espressif.com/projects/esp-idf/en/latest/contribute/index.html).