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215 lines
7.4 KiB
215 lines
7.4 KiB
.. _esp32_devkitc_wroom: |
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ESP32-DEVKITC-WROOM |
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################### |
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Overview |
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******** |
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ESP32-DEVKITC-WROOM is a series of low cost, low power system on a chip microcontrollers |
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with integrated Wi-Fi & dual-mode Bluetooth. The ESP32 series employs a |
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Tensilica Xtensa LX6 microprocessor in both dual-core and single-core |
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variations. ESP32-WROOM is created and developed by Espressif Systems, a |
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Shanghai-based Chinese company, and is manufactured by TSMC using their 40nm |
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process. [1]_ |
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The features include the following: |
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- Dual core Xtensa microprocessor (LX6), running at 160 or 240MHz |
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- 520KB of SRAM |
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- 802.11b/g/n/e/i |
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- Bluetooth v4.2 BR/EDR and BLE |
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- Various peripherals: |
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- 12-bit ADC with up to 18 channels |
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- 2x 8-bit DACs |
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- 10x touch sensors |
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- Temperature sensor |
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- 4x SPI |
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- 2x I2S |
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- 2x I2C |
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- 3x UART |
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- SD/SDIO/MMC host |
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- Slave (SDIO/SPI) |
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- Ethernet MAC |
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- CAN bus 2.0 |
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- IR (RX/TX) |
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- Motor PWM |
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- LED PWM with up to 16 channels |
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- Hall effect sensor |
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- Cryptographic hardware acceleration (RNG, ECC, RSA, SHA-2, AES) |
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- 5uA deep sleep current |
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.. figure:: img/esp32_devkitc_wroom.jpg |
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:align: center |
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:alt: ESP32-DEVKITC-WROOM |
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ESP32-DevKitC-WROOM-32D DK |
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Asymmetric Multiprocessing (AMP) |
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******************************** |
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ESP32-DEVKITC-WROOM allows 2 different applications to be executed in ESP32 SoC. Due to its dual-core architecture, each core can be enabled to execute customized tasks in stand-alone mode |
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and/or exchanging data over OpenAMP framework. See :ref:`ipc_samples` folder as code reference. |
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Supported Features |
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================== |
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Current Zephyr's ESP32-WROOM board supports the following features: |
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+------------+------------+-------------------------------------+ |
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| Interface | Controller | Driver/Component | |
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+============+============+=====================================+ |
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+------------+------------+-------------------------------------+ |
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| UART | on-chip | serial port | |
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+------------+------------+-------------------------------------+ |
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| GPIO | on-chip | gpio | |
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+------------+------------+-------------------------------------+ |
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| PINMUX | on-chip | pinmux | |
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+------------+------------+-------------------------------------+ |
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| USB-JTAG | on-chip | hardware interface | |
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+------------+------------+-------------------------------------+ |
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| SPI Master | on-chip | spi | |
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+------------+------------+-------------------------------------+ |
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| Timers | on-chip | counter | |
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+------------+------------+-------------------------------------+ |
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| Watchdog | on-chip | watchdog | |
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+------------+------------+-------------------------------------+ |
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| TRNG | on-chip | entropy | |
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+------------+------------+-------------------------------------+ |
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| LEDC | on-chip | pwm | |
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+------------+------------+-------------------------------------+ |
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| MCPWM | on-chip | pwm | |
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+------------+------------+-------------------------------------+ |
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| PCNT | on-chip | qdec | |
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+------------+------------+-------------------------------------+ |
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| SPI DMA | on-chip | spi | |
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+------------+------------+-------------------------------------+ |
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| TWAI | on-chip | can | |
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+------------+------------+-------------------------------------+ |
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| ADC | on-chip | adc | |
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+------------+------------+-------------------------------------+ |
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| DAC | on-chip | dac | |
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+------------+------------+-------------------------------------+ |
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| Wi-Fi | on-chip | | |
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+------------+------------+-------------------------------------+ |
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| Bluetooth | on-chip | | |
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+------------+------------+-------------------------------------+ |
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System requirements |
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=================== |
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Prerequisites |
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------------- |
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Espressif HAL requires WiFi and Bluetooth binary blobs in order work. Run the command |
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below to retrieve those files. |
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.. code-block:: console |
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west blobs fetch hal_espressif |
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.. note:: |
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It is recommended running the command above after :file:`west update`. |
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Building & Flashing |
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------------------- |
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Build and flash applications as usual (see :ref:`build_an_application` and |
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:ref:`application_run` for more details). |
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.. zephyr-app-commands:: |
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:zephyr-app: samples/hello_world |
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:board: esp32_devkitc_wroom/esp32/procpu |
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:goals: build |
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The usual ``flash`` target will work with the ``esp32_devkitc_wroom`` board |
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configuration. Here is an example for the :ref:`hello_world` |
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application. |
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.. zephyr-app-commands:: |
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:zephyr-app: samples/hello_world |
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:board: esp32_devkitc_wroom/esp32/procpu |
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:goals: flash |
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Open the serial monitor using the following command: |
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.. code-block:: shell |
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west espressif monitor |
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After the board has automatically reset and booted, you should see the following |
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message in the monitor: |
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.. code-block:: console |
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***** Booting Zephyr OS vx.x.x-xxx-gxxxxxxxxxxxx ***** |
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Hello World! esp32_devkitc_wroom |
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Debugging |
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--------- |
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ESP32-DEVKITC-WROOM support on OpenOCD is available upstream as of version 0.12.0. |
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Download and install OpenOCD from `OpenOCD`_. |
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On the ESP-WROOM-32 DevKitC board, the JTAG pins are not run to a |
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standard connector (e.g. ARM 20-pin) and need to be manually connected |
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to the external programmer (e.g. a Flyswatter2): |
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+------------+-----------+ |
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| ESP32 pin | JTAG pin | |
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+============+===========+ |
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| 3V3 | VTRef | |
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+------------+-----------+ |
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| EN | nTRST | |
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+------------+-----------+ |
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| IO14 | TMS | |
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+------------+-----------+ |
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| IO12 | TDI | |
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+------------+-----------+ |
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| GND | GND | |
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+------------+-----------+ |
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| IO13 | TCK | |
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+------------+-----------+ |
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| IO15 | TDO | |
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+------------+-----------+ |
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Further documentation can be obtained from the SoC vendor in `JTAG debugging |
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for ESP32`_. |
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Here is an example for building the :ref:`hello_world` application. |
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.. zephyr-app-commands:: |
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:zephyr-app: samples/hello_world |
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:board: esp32_devkitc_wroom/esp32/procpu |
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:goals: build flash |
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You can debug an application in the usual way. Here is an example for the :ref:`hello_world` application. |
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.. zephyr-app-commands:: |
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:zephyr-app: samples/hello_world |
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:board: esp32_devkitc_wroom/esp32/procpu |
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:goals: debug |
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Note on Debugging with GDB Stub |
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=============================== |
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GDB stub is enabled on ESP32. |
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* When adding breakpoints, please use hardware breakpoints with command |
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``hbreak``. Command ``break`` uses software breakpoints which requires |
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modifying memory content to insert break/trap instructions. |
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This does not work as the code is on flash which cannot be randomly |
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accessed for modification. |
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.. _`JTAG debugging for ESP32`: https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/jtag-debugging/index.html |
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.. _`OpenOCD`: https://github.com/openocd-org/openocd |
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References |
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********** |
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.. [1] https://en.wikipedia.org/wiki/ESP32 |
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.. _ESP32 Technical Reference Manual: https://espressif.com/sites/default/files/documentation/esp32_technical_reference_manual_en.pdf |
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.. _Hardware Reference: https://docs.espressif.com/projects/esp-idf/en/latest/esp32/hw-reference/index.html
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