boards: esp32s2_devkitc: initial board support

Initial board files created to support the esp32s2_devkitc board.

Signed-off-by: Marcio Ribeiro <marcio.ribeiro@espressif.com>

boards/espressif/esp32s2_devkitc/Kconfig.defconfig

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+# ESP32S2 DevKitC board configuration
+
+# Copyright (c) 2024 Espressif Systems (Shanghai) Co., Ltd.
+# SPDX-License-Identifier: Apache-2.0
+
+config ENTROPY_GENERATOR
+	default y
+
+config HEAP_MEM_POOL_ADD_SIZE_BOARD
+	int
+	default 32768 if WIFI
+	default 4096

boards/espressif/esp32s2_devkitc/Kconfig.esp32s2_devkitc

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+# Copyright (c) 2024 Espressif Systems (Shanghai) Co., Ltd.
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_ESP32S2_DEVKITC
+	select SOC_ESP32S2_SOLO_N4R2

boards/espressif/esp32s2_devkitc/Kconfig.sysbuild

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+# Copyright (c) 2024 Espressif Systems (Shanghai) Co., Ltd.
+# SPDX-License-Identifier: Apache-2.0
+
+choice BOOTLOADER
+	default BOOTLOADER_MCUBOOT
+endchoice
+
+choice BOOT_SIGNATURE_TYPE
+	default BOOT_SIGNATURE_TYPE_NONE
+endchoice

boards/espressif/esp32s2_devkitc/board.cmake

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+# SPDX-License-Identifier: Apache-2.0
+
+if(NOT "${OPENOCD}" MATCHES "^${ESPRESSIF_TOOLCHAIN_PATH}/.*")
+  set(OPENOCD OPENOCD-NOTFOUND)
+endif()
+find_program(OPENOCD openocd PATHS ${ESPRESSIF_TOOLCHAIN_PATH}/openocd-esp32/bin NO_DEFAULT_PATH)
+
+include(${ZEPHYR_BASE}/boards/common/esp32.board.cmake)
+include(${ZEPHYR_BASE}/boards/common/openocd.board.cmake)

boards/espressif/esp32s2_devkitc/board.yml

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+board:
+  name: esp32s2_devkitc
+  vendor: espressif
+  socs:
+  - name: esp32s2

boards/espressif/esp32s2_devkitc/doc/index.rst

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+.. _esp32s2_devkitc:
+
+ESP32-S2
+########
+
+Overview
+********
+
+ESP32-S2 is a highly integrated, low-power, single-core Wi-Fi Microcontroller SoC, designed to be secure and
+cost-effective, with a high performance and a rich set of IO capabilities. [1]_
+
+The features include the following:
+
+- RSA-3072-based secure boot
+- AES-XTS-256-based flash encryption
+- Protected private key and device secrets from software access
+- Cryptographic accelerators for enhanced performance
+- Protection against physical fault injection attacks
+- Various peripherals:
+
+  - 43x programmable GPIOs
+  - 14x configurable capacitive touch GPIOs
+  - USB OTG
+  - LCD interface
+  - camera interface
+  - SPI
+  - I2S
+  - UART
+  - ADC
+  - DAC
+  - LED PWM with up to 8 channels
+
+Supported Features
+==================
+
+Current Zephyr's ESP32-S2-devkitc 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                                 |
++------------+------------+-------------------------------------+
+| PCNT       | on-chip    | qdec                                |
++------------+------------+-------------------------------------+
+| SPI DMA    | on-chip    | spi                                 |
++------------+------------+-------------------------------------+
+| ADC        | on-chip    | adc                                 |
++------------+------------+-------------------------------------+
+| DAC        | on-chip    | dac                                 |
++------------+------------+-------------------------------------+
+| Wi-Fi      | 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
+*******************
+
+ESP-IDF bootloader
+==================
+
+The board is using the ESP-IDF bootloader as the default 2nd stage bootloader.
+It is build as a subproject at each application build. No further attention
+is expected from the user.
+
+MCUboot bootloader
+==================
+
+User may choose to use MCUboot bootloader instead. In that case the bootloader
+must be build (and flash) 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.
+   ```
+   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
+   :app: samples/hello_world
+   :board: esp32s2_devkitc
+   :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 build 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: esp32s2_devkitc
+   :goals: build
+
+The usual ``flash`` target will work with the ``esp32s2_devkitc`` board
+configuration. Here is an example for the :ref:`hello_world`
+application.
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/hello_world
+   :board: esp32s2_devkitc
+   :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! esp32s2_devkitc
+
+Debugging
+*********
+
+ESP32-S2 support on OpenOCD is available upstream as of version 0.12.0.
+Download and install OpenOCD from `OpenOCD`_.
+
+The following table shows the pin mapping between ESP32-S2 board and JTAG interface.
+
++---------------+-----------+
+| ESP32 pin     | JTAG pin  |
++===============+===========+
+| MTDO / GPIO40 | TDO       |
++---------------+-----------+
+| MTDI / GPIO41 | TDI       |
++---------------+-----------+
+| MTCK / GPIO39 | TCK       |
++---------------+-----------+
+| MTMS / GPIO42 | TMS       |
++---------------+-----------+
+
+Further documentation can be obtained from the SoC vendor in `JTAG debugging for ESP32-S2`_.
+
+Here is an example for building the :ref:`hello_world` application.
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/hello_world
+   :board: esp32s2_devkitc
+   :goals: build flash
+
+You can debug an application in the usual way. Here is an example for the :ref:`hello_world` application.
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/hello_world
+   :board: esp32s2_devkitc
+   :goals: debug
+
+.. _`OpenOCD`: https://github.com/openocd-org/openocd
+.. _`JTAG debugging for ESP32-S2`: https://docs.espressif.com/projects/esp-idf/en/latest/esp32s2/api-guides/jtag-debugging/index.html
+
+
+References
+**********
+
+.. [1] https://www.espressif.com/en/products/socs/esp32-s2
+.. _ESP32-S2 DevKitC User Guide: https://docs.espressif.com/projects/esp-idf/en/latest/esp32s2/hw-reference/esp32s2/user-guide-s2-devkitc-1.html
+.. _ESP32S2 Technical Reference Manual: https://espressif.com/sites/default/files/documentation/esp32-s2_technical_reference_manual_en.pdf
+.. _ESP32S2 Datasheet: https://www.espressif.com/sites/default/files/documentation/esp32-s2_datasheet_en.pdf

boards/espressif/esp32s2_devkitc/esp32s2_devkitc-pinctrl.dtsi

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+/*
+ * Copyright (c) 2024 Espressif Systems (Shanghai) Co., Ltd.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/pinctrl/esp-pinctrl-common.h>
+#include <dt-bindings/pinctrl/esp32s2-pinctrl.h>
+#include <zephyr/dt-bindings/pinctrl/esp32s2-gpio-sigmap.h>
+
+&pinctrl {
+
+	uart0_default: uart0_default {
+		group1 {
+			pinmux = <UART0_TX_GPIO43>;
+			output-high;
+		};
+		group2 {
+			pinmux = <UART0_RX_GPIO44>;
+			bias-pull-up;
+		};
+	};
+
+	spim2_default: spim2_default {
+		group1 {
+			pinmux = <SPIM2_MISO_GPIO13>,
+				 <SPIM2_SCLK_GPIO12>,
+				 <SPIM2_CSEL_GPIO10>;
+		};
+		group2 {
+			pinmux = <SPIM2_MOSI_GPIO11>;
+			output-low;
+		};
+	};
+
+	spim3_default: spim3_default {
+		group1 {
+			pinmux = <SPIM3_MISO_GPIO37>,
+				 <SPIM3_SCLK_GPIO36>,
+				 <SPIM3_CSEL_GPIO34>;
+		};
+		group2 {
+			pinmux = <SPIM3_MOSI_GPIO35>;
+			output-low;
+		};
+	};
+
+	i2c0_default: i2c0_default {
+		group1 {
+			pinmux = <I2C0_SDA_GPIO8>,
+				 <I2C0_SCL_GPIO9>;
+			bias-pull-up;
+			drive-open-drain;
+			output-high;
+		};
+	};
+
+	i2c1_default: i2c1_default {
+		group1 {
+			pinmux = <I2C1_SDA_GPIO3>,
+				 <I2C1_SCL_GPIO4>;
+			bias-pull-up;
+			drive-open-drain;
+			output-high;
+		};
+	};
+
+};

boards/espressif/esp32s2_devkitc/esp32s2_devkitc.dts

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+/*
+ * Copyright (c) 2024 Espressif Systems (Shanghai) Co., Ltd.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+
+#include <espressif/esp32s2/esp32s2_solo_n4r2.dtsi>
+#include "esp32s2_devkitc-pinctrl.dtsi"
+#include <zephyr/dt-bindings/input/input-event-codes.h>
+#include <zephyr/dt-bindings/input/esp32-touch-sensor-input.h>
+
+/ {
+	model = "Espressif ESP32S2_DevKitC";
+	compatible = "espressif,esp32s2";
+
+	aliases {
+		sw0 = &user_button;
+		i2c-0 = &i2c0;
+		watchdog0 = &wdt0;
+	};
+
+	chosen {
+		zephyr,sram = &sram0;
+		zephyr,console = &uart0;
+		zephyr,shell-uart = &uart0;
+		zephyr,flash = &flash0;
+		zephyr,code-partition = &slot0_partition;
+	};
+
+	gpio_keys {
+		compatible = "gpio-keys";
+		user_button: user_button {
+			label = "BOOT";
+			gpios = <&gpio0 0 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
+			zephyr,code = <INPUT_KEY_0>;
+		};
+	};
+};
+
+&cpu0 {
+	clock-frequency = <ESP32_CLK_CPU_240M>;
+};
+
+&uart0 {
+	status = "okay";
+	current-speed = <115200>;
+	pinctrl-0 = <&uart0_default>;
+	pinctrl-names = "default";
+};
+
+&gpio0 {
+	status = "okay";
+};
+
+&gpio1 {
+	status = "okay";
+};
+
+&touch {
+	debounce-interval-ms = <30>;
+	href-microvolt = <2700000>;
+	lref-microvolt = <500000>;
+	href-atten-microvolt = <1000000>;
+	filter-mode = <ESP32_TOUCH_FILTER_MODE_IIR_16>;
+	filter-debounce-cnt = <1>;
+	filter-noise-thr = <ESP32_TOUCH_FILTER_NOISE_THR_4_8TH>;
+	filter-jitter-step = <4>;
+	filter-smooth-level = <ESP32_TOUCH_FILTER_SMOOTH_MODE_IIR_2>;
+};
+
+&timer0 {
+	status = "disabled";
+};
+
+&timer1 {
+	status = "disabled";
+};
+
+&timer2 {
+	status = "disabled";
+};
+
+&timer3 {
+	status = "disabled";
+};
+
+&i2c0 {
+	status = "okay";
+	clock-frequency = <I2C_BITRATE_STANDARD>;
+	pinctrl-0 = <&i2c0_default>;
+	pinctrl-names = "default";
+};
+
+&i2c1 {
+	clock-frequency = <I2C_BITRATE_STANDARD>;
+	pinctrl-0 = <&i2c1_default>;
+	pinctrl-names = "default";
+};
+
+&trng0 {
+	status = "okay";
+};
+
+&spi2 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+	pinctrl-0 = <&spim2_default>;
+	pinctrl-names = "default";
+};
+
+&spi3 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+	pinctrl-0 = <&spim3_default>;
+	pinctrl-names = "default";
+};
+
+
+&flash0 {
+	status = "okay";
+
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		/* Reserve 60kB for the bootloader */
+		boot_partition: partition@1000 {
+			label = "mcuboot";
+			reg = <0x00001000 0x0000F000>;
+			read-only;
+		};
+
+		/* Reserve 1024kB for the application in slot 0 */
+		slot0_partition: partition@10000 {
+			label = "image-0";
+			reg = <0x00010000 0x00100000>;
+		};
+
+		/* Reserve 1024kB for the application in slot 1 */
+		slot1_partition: partition@110000 {
+			label = "image-1";
+			reg = <0x00110000 0x00100000>;
+		};
+
+		/* Reserve 256kB for the scratch partition */
+		scratch_partition: partition@210000 {
+			   label = "image-scratch";
+			   reg = <0x00210000 0x00040000>;
+		};
+
+		storage_partition: partition@250000 {
+			label = "storage";
+			reg = <0x00250000 0x00006000>;
+		};
+	};
+};
+
+&wdt0 {
+	status = "okay";
+};

boards/espressif/esp32s2_devkitc/esp32s2_devkitc.yaml

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+identifier: esp32s2_devkitc
+name: ESP32-S2 DevKitC
+type: mcu
+arch: xtensa
+toolchain:
+  - zephyr
+supported:
+  - adc
+  - dac
+  - gpio
+  - i2c
+  - watchdog
+  - uart
+  - nvs
+  - pwm
+  - spi
+  - counter
+  - entropy
+  - input
+  - can
+  - dma
+testing:
+  ignore_tags:
+    - net
+    - bluetooth
+vendor: espressif

boards/espressif/esp32s2_devkitc/esp32s2_devkitc_defconfig

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+# SPDX-License-Identifier: Apache-2.0
+
+
+CONFIG_MAIN_STACK_SIZE=2048
+
+CONFIG_CONSOLE=y
+CONFIG_SERIAL=y
+CONFIG_UART_CONSOLE=y
+
+CONFIG_GPIO=y

boards/espressif/esp32s2_devkitc/support/openocd.cfg

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+set ESP_RTOS none
+
+source [find interface/ftdi/esp32s2_kaluga_v1.cfg]
+source [find target/esp32s2.cfg]