124 lines
6.3 KiB
Markdown
124 lines
6.3 KiB
Markdown
# Espressif IoT Development Framework
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[](https://docs.espressif.com/projects/esp-idf/en/latest/?badge=latest)
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ESP-IDF is the official development framework for the [ESP32](https://espressif.com/en/products/hardware/esp32/overview) chip.
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# Developing With ESP-IDF
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## Setting Up ESP-IDF
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See setup guides for detailed instructions to set up the ESP-IDF:
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* [Getting Started Guide for the stable ESP-IDF version](https://docs.espressif.com/projects/esp-idf/en/stable/get-started/)
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* [Getting Started Guide for the latest (master branch) ESP-IDF version](https://docs.espressif.com/projects/esp-idf/en/latest/get-started/)
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## Finding a Project
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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.
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Once you've found the project you want to work with, change to its directory and you can configure and build it.
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To start your own project based on an example, copy the example project directory outside of the ESP-IDF directory.
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# Quick Reference
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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:
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## Configuring the Project
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`make menuconfig`
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* Opens a text-based configuration menu for the project.
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* Use up & down arrow keys to navigate the menu.
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* Use Enter key to go into a submenu, Escape key to go out or to exit.
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* Type `?` to see a help screen. Enter key exits the help screen.
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* Use Space key, or `Y` and `N` keys to enable (Yes) and disable (No) configuration items with checkboxes "`[*]`"
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* Pressing `?` while highlighting a configuration item displays help about that item.
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* Type `/` to search the configuration items.
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Once done configuring, press Escape multiple times to exit and say "Yes" to save the new configuration when prompted.
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## Compiling the Project
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`make -j4 all`
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... will compile app, bootloader and generate a partition table based on the config.
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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)`.
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## Flashing the Project
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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:
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`make -j4 flash`
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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`.
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You don't need to run `make all` before running `make flash`, `make flash` will automatically rebuild anything which needs it.
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## Viewing Serial Output
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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).
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Exit the monitor by typing Ctrl-].
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To build, flash and monitor output in one pass, you can run:
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`make -j4 flash monitor`
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## Compiling & Flashing Only the App
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After the initial flash, you may just want to build and flash just your app, not the bootloader and partition table:
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* `make app` - build just the app.
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* `make app-flash` - flash just the app.
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`make app-flash` will automatically rebuild the app if any source files have changed.
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(In normal development there's no downside to reflashing the bootloader and partition table each time, if they haven't changed.)
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## Parallel Builds
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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.)
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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:
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```
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make -j5 flash monitor
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```
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## The Partition Table
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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.
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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.
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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.
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The simplest way to use the partition table is to `make menuconfig` and choose one of the simple predefined partition tables:
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* "Single factory app, no OTA"
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* "Factory app, two OTA definitions"
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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.
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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.
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## Erasing Flash
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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`.
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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.
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# Resources
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* Documentation for the latest version: https://docs.espressif.com/projects/esp-idf/. This documentation is built from the [docs directory](docs) of this repository.
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* The [esp32.com forum](https://esp32.com/) is a place to ask questions and find community resources.
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* [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.
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* 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).
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