252 lines
8.5 KiB
ReStructuredText
252 lines
8.5 KiB
ReStructuredText
.. zephyr:board:: esp32c3_devkitm
|
|
|
|
Overview
|
|
********
|
|
|
|
ESP32-C3-DevKitM is an entry-level development board based on ESP32-C3-MINI-1,
|
|
a module named for its small size. This board integrates complete Wi-Fi and Bluetooth® Low Energy functions.
|
|
For more information, check `ESP32-C3-DevKitM`_.
|
|
|
|
Hardware
|
|
********
|
|
|
|
ESP32-C3 is a single-core Wi-Fi and Bluetooth 5 (LE) microcontroller SoC,
|
|
based on the open-source RISC-V architecture. It strikes the right balance of power,
|
|
I/O capabilities and security, thus offering the optimal cost-effective
|
|
solution for connected devices.
|
|
The availability of Wi-Fi and Bluetooth 5 (LE) connectivity not only makes the device configuration easy,
|
|
but it also facilitates a variety of use-cases based on dual connectivity.
|
|
|
|
The features include the following:
|
|
|
|
- 32-bit core RISC-V microcontroller with a maximum clock speed of 160 MHz
|
|
- 400 KB of internal RAM
|
|
- 802.11b/g/n/e/i
|
|
- A Bluetooth LE subsystem that supports features of Bluetooth 5 and Bluetooth Mesh
|
|
- Various peripherals:
|
|
|
|
- 12-bit ADC with up to 6 channels
|
|
- TWAI compatible with CAN bus 2.0
|
|
- Temperature sensor
|
|
- 3x SPI
|
|
- 1x I2S
|
|
- 1x I2C
|
|
- 2x UART
|
|
- LED PWM with up to 6 channels
|
|
|
|
- Cryptographic hardware acceleration (RNG, ECC, RSA, SHA-2, AES)
|
|
|
|
For more information, check the datasheet at `ESP32-C3 Datasheet`_ or the technical reference
|
|
manual at `ESP32-C3 Technical Reference Manual`_.
|
|
|
|
Supported Features
|
|
==================
|
|
|
|
Current Zephyr's ESP32-C3-Devkitm board supports the following features:
|
|
|
|
+------------+------------+-------------------------------------+
|
|
| Interface | Controller | Driver/Component |
|
|
+============+============+=====================================+
|
|
| UART | on-chip | serial port |
|
|
+------------+------------+-------------------------------------+
|
|
| GPIO | on-chip | gpio |
|
|
+------------+------------+-------------------------------------+
|
|
| PINMUX | on-chip | pinmux |
|
|
+------------+------------+-------------------------------------+
|
|
| USB-JTAG | on-chip | hardware interface |
|
|
+------------+------------+-------------------------------------+
|
|
| SPI Master | on-chip | spi |
|
|
+------------+------------+-------------------------------------+
|
|
| Timers | on-chip | counter |
|
|
+------------+------------+-------------------------------------+
|
|
| Watchdog | on-chip | watchdog |
|
|
+------------+------------+-------------------------------------+
|
|
| TRNG | on-chip | entropy |
|
|
+------------+------------+-------------------------------------+
|
|
| LEDC | on-chip | pwm |
|
|
+------------+------------+-------------------------------------+
|
|
| SPI DMA | on-chip | spi |
|
|
+------------+------------+-------------------------------------+
|
|
| TWAI | on-chip | can |
|
|
+------------+------------+-------------------------------------+
|
|
| USB-CDC | on-chip | serial |
|
|
+------------+------------+-------------------------------------+
|
|
| ADC | on-chip | adc |
|
|
+------------+------------+-------------------------------------+
|
|
| Wi-Fi | on-chip | |
|
|
+------------+------------+-------------------------------------+
|
|
| Bluetooth | on-chip | |
|
|
+------------+------------+-------------------------------------+
|
|
|
|
System requirements
|
|
*******************
|
|
|
|
Prerequisites
|
|
=============
|
|
|
|
Espressif HAL requires WiFi and Bluetooth binary blobs in order work. Run the command
|
|
below to retrieve those files.
|
|
|
|
.. code-block:: console
|
|
|
|
west blobs fetch hal_espressif
|
|
|
|
.. note::
|
|
|
|
It is recommended running the command above after :file:`west update`.
|
|
|
|
Building & Flashing
|
|
*******************
|
|
|
|
Simple boot
|
|
===========
|
|
|
|
The board could be loaded using the single binary image, without 2nd stage bootloader.
|
|
It is the default option when building the application without additional configuration.
|
|
|
|
.. note::
|
|
|
|
Simple boot does not provide any security features nor OTA updates.
|
|
|
|
MCUboot bootloader
|
|
==================
|
|
|
|
User may choose to use MCUboot bootloader instead. In that case the bootloader
|
|
must be built (and flashed) at least once.
|
|
|
|
There are two options to be used when building an application:
|
|
|
|
1. Sysbuild
|
|
2. Manual build
|
|
|
|
.. note::
|
|
|
|
User can select the MCUboot bootloader by adding the following line
|
|
to the board default configuration file.
|
|
|
|
.. code:: cfg
|
|
|
|
CONFIG_BOOTLOADER_MCUBOOT=y
|
|
|
|
Sysbuild
|
|
========
|
|
|
|
The sysbuild makes possible to build and flash all necessary images needed to
|
|
bootstrap the board with the ESP32 SoC.
|
|
|
|
To build the sample application using sysbuild use the command:
|
|
|
|
.. zephyr-app-commands::
|
|
:tool: west
|
|
:zephyr-app: samples/hello_world
|
|
:board: esp32c3_devkitm
|
|
:goals: build
|
|
:west-args: --sysbuild
|
|
:compact:
|
|
|
|
By default, the ESP32 sysbuild creates bootloader (MCUboot) and application
|
|
images. But it can be configured to create other kind of images.
|
|
|
|
Build directory structure created by sysbuild is different from traditional
|
|
Zephyr build. Output is structured by the domain subdirectories:
|
|
|
|
.. code-block::
|
|
|
|
build/
|
|
├── hello_world
|
|
│ └── zephyr
|
|
│ ├── zephyr.elf
|
|
│ └── zephyr.bin
|
|
├── mcuboot
|
|
│ └── zephyr
|
|
│ ├── zephyr.elf
|
|
│ └── zephyr.bin
|
|
└── domains.yaml
|
|
|
|
.. note::
|
|
|
|
With ``--sysbuild`` option the bootloader will be re-build and re-flash
|
|
every time the pristine build is used.
|
|
|
|
For more information about the system build please read the :ref:`sysbuild` documentation.
|
|
|
|
Manual build
|
|
============
|
|
|
|
During the development cycle, it is intended to build & flash as quickly possible.
|
|
For that reason, images can be built one at a time using traditional build.
|
|
|
|
The instructions following are relevant for both manual build and sysbuild.
|
|
The only difference is the structure of the build directory.
|
|
|
|
.. note::
|
|
|
|
Remember that bootloader (MCUboot) needs to be flash at least once.
|
|
|
|
Build and flash applications as usual (see :ref:`build_an_application` and
|
|
:ref:`application_run` for more details).
|
|
|
|
.. zephyr-app-commands::
|
|
:zephyr-app: samples/hello_world
|
|
:board: esp32c3_devkitm
|
|
:goals: build
|
|
|
|
The usual ``flash`` target will work with the ``esp32c3_devkitm`` board
|
|
configuration. Here is an example for the :zephyr:code-sample:`hello_world`
|
|
application.
|
|
|
|
.. zephyr-app-commands::
|
|
:zephyr-app: samples/hello_world
|
|
:board: esp32c3_devkitm
|
|
:goals: flash
|
|
|
|
Open the serial monitor using the following command:
|
|
|
|
.. code-block:: shell
|
|
|
|
west espressif monitor
|
|
|
|
After the board has automatically reset and booted, you should see the following
|
|
message in the monitor:
|
|
|
|
.. code-block:: console
|
|
|
|
***** Booting Zephyr OS vx.x.x-xxx-gxxxxxxxxxxxx *****
|
|
Hello World! esp32c3_devkitm
|
|
|
|
Debugging
|
|
*********
|
|
|
|
As with much custom hardware, the ESP32-C3 modules require patches to
|
|
OpenOCD that are not upstreamed yet. Espressif maintains their own fork of
|
|
the project. The custom OpenOCD can be obtained at `OpenOCD ESP32`_.
|
|
|
|
The Zephyr SDK uses a bundled version of OpenOCD by default. You can overwrite that behavior by adding the
|
|
``-DOPENOCD=<path/to/bin/openocd> -DOPENOCD_DEFAULT_PATH=<path/to/openocd/share/openocd/scripts>``
|
|
parameter when building.
|
|
|
|
Here is an example for building the :zephyr:code-sample:`hello_world` application.
|
|
|
|
.. zephyr-app-commands::
|
|
:zephyr-app: samples/hello_world
|
|
:board: esp32c3_devkitm
|
|
:goals: build flash
|
|
:gen-args: -DOPENOCD=<path/to/bin/openocd> -DOPENOCD_DEFAULT_PATH=<path/to/openocd/share/openocd/scripts>
|
|
|
|
You can debug an application in the usual way. Here is an example for the :zephyr:code-sample:`hello_world` application.
|
|
|
|
.. zephyr-app-commands::
|
|
:zephyr-app: samples/hello_world
|
|
:board: esp32c3_devkitm
|
|
:goals: debug
|
|
|
|
References
|
|
**********
|
|
|
|
.. target-notes::
|
|
|
|
.. _`ESP32-C3-DevKitM`: https://docs.espressif.com/projects/esp-idf/en/latest/esp32c3/hw-reference/esp32c3/user-guide-devkitm-1.html
|
|
.. _`ESP32-C3 Datasheet`: https://www.espressif.com/sites/default/files/documentation/esp32-c3_datasheet_en.pdf
|
|
.. _`ESP32-C3 Technical Reference Manual`: https://espressif.com/sites/default/files/documentation/esp32-c3_technical_reference_manual_en.pdf
|
|
.. _`OpenOCD ESP32`: https://github.com/espressif/openocd-esp32/releases
|