boards: Add support for 01space esp32c3 0.42 oled

From https://github.com/01Space/ESP32-C3-0.42LCD/

Adapted from the XIAO ESP32C3 board.

Signed-off-by: Jonathan Rico <[email protected]>

boards/01space/esp32c3_042_oled/Kconfig.defconfig

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+# Copyright 2022 Google LLC
+# SPDX-License-Identifier: Apache-2.0
+
+config HEAP_MEM_POOL_ADD_SIZE_BOARD
+	int
+	default 65535 if WIFI && BT
+	default 51200 if WIFI
+	default 40960 if BT
+	default 4096

boards/01space/esp32c3_042_oled/Kconfig.esp32c3_042_oled

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+# Copyright 2024 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_ESP32C3_042_OLED
+	select SOC_ESP32C3_FX4

boards/01space/esp32c3_042_oled/Kconfig.sysbuild

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+# Copyright (c) 2023 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/01space/esp32c3_042_oled/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/01space/esp32c3_042_oled/board.yml

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+board:
+  name: esp32c3_042_oled
+  vendor: 01space
+  socs:
+  - name: esp32c3

boards/01space/esp32c3_042_oled/doc/index.rst

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+.. _01space_esp32c3_042_oled:
+
+ESP32C3 0.42 OLED
+#################
+
+Overview
+********
+
+ESP32C3 0.42 OLED is a mini development board based on the `Espressif ESP32-C3`_
+RISC-V WiFi/Bluetooth dual-mode chip.
+
+For more details see the `01space ESP32C3 0.42 OLED`_ Github repo.
+
+.. figure:: img/esp32c3_042_oled.webp
+   :align: center
+   :alt: 01space ESP32C3 0.42 OLED
+
+   01space ESP32C3 0.42 OLED
+
+Hardware
+********
+
+This board is based on the ESP32-C3-FH4 with WiFi and BLE support.
+It features:
+
+* RISC-V SoC @ 160MHz with 4MB flash and 400kB RAM
+* WS2812B RGB serial LED
+* 0.42-inch OLED over I2C
+* Qwiic I2C connector
+* One pushbutton
+* Onboard ceramic chip antenna
+* On-chip USB-UART converter
+
+.. note::
+
+   The RGB led is not supported on this Zephyr board yet.
+
+.. note::
+
+   The ESP32-C3 does not have native USB, it has an on-chip USB-serial converter
+   instead.
+
+Supported Features
+==================
+
+The 01space ESP32C3 0.42 OLED board configuration supports the following hardware features:
+
++-----------+------------+------------------+
+| Interface | Controller | Driver/Component |
++===========+============+==================+
+| PMP       | on-chip    | arch/riscv       |
++-----------+------------+------------------+
+| INTMTRX   | on-chip    | intc_esp32c3     |
++-----------+------------+------------------+
+| PINMUX    | on-chip    | pinctrl_esp32    |
++-----------+------------+------------------+
+| USB UART  | on-chip    | serial_esp32_usb |
++-----------+------------+------------------+
+| GPIO      | on-chip    | gpio_esp32       |
++-----------+------------+------------------+
+| UART      | on-chip    | uart_esp32       |
++-----------+------------+------------------+
+| I2C       | on-chip    | i2c_esp32        |
++-----------+------------+------------------+
+| SPI       | on-chip    | spi_esp32_spim   |
++-----------+------------+------------------+
+| RADIO     | on-chip    | Bluetooth        |
++-----------+------------+------------------+
+| DISPLAY   | off-chip   | display          |
++-----------+------------+------------------+
+
+Connections and IOs
+===================
+
+See the following image:
+
+.. figure:: img/esp32c3_042_oled_pinout.webp
+   :align: center
+   :alt: 01space ESP32C3 0.42 OLED Pinout
+
+   01space ESP32C3 0.42 OLED Pinout
+
+It also features a 0.42 inch OLED display, driven by a SSD1306-compatible chip.
+It is connected over I2C: SDA on GPIO5, SCL on GPIO6.
+
+Prerequisites
+=============
+
+Espressif HAL requires WiFi and Bluetooth binary blobs. 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`.
+
+Programming and Debugging
+*************************
+
+Standalone application
+======================
+
+The board can be loaded using a single binary image, without 2nd stage bootloader.
+It is the default option when building the application without additional configuration.
+
+.. note::
+
+   This mode does not provide any security features nor OTA updates.
+
+Use the following command to build a sample hello_world application:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/hello_world
+   :board: esp32c3_042_oled
+   :goals: build
+
+Sysbuild
+========
+
+:ref:`sysbuild` makes it possible to build and flash all necessary images needed to
+bootstrap the board.
+
+By default, the ESP32 sysbuild configuration creates bootloader (MCUboot) and
+application images.
+
+To build the sample application using sysbuild, use this command:
+
+.. zephyr-app-commands::
+   :tool: west
+   :app: samples/hello_world
+   :board: esp32c3_042_oled
+   :goals: build
+   :west-args: --sysbuild
+   :compact:
+
+Flashing
+========
+
+For the :code:`Hello, world!` application, follow the instructions below.
+Assuming the board is connected to ``/dev/ttyACM0`` on Linux.
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/hello_world
+   :board: esp32c3_042_oled
+   :goals: flash
+   :flash-args: --esp-device /dev/ttyACM0
+
+Since the Zephyr console is by default on the ``usb_serial`` device, we use
+the espressif monitor utility to connect to the console.
+
+.. code-block:: console
+
+   $ west espressif monitor -p /dev/ttyACM0
+
+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_042_oled
+
+References
+**********
+
+.. target-notes::
+
+.. _`Espressif ESP32-C3`: https://www.espressif.com/en/products/socs/esp32-c3
+.. _`01space ESP32C3 0.42 OLED`: https://github.com/01Space/ESP32-C3-0.42LCD

boards/01space/esp32c3_042_oled/esp32c3_042_oled-pinctrl.dtsi

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+/*
+ * Copyright 2022 Google LLC
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/pinctrl/esp-pinctrl-common.h>
+#include <dt-bindings/pinctrl/esp32c3-pinctrl.h>
+#include <zephyr/dt-bindings/pinctrl/esp32c3-gpio-sigmap.h>
+
+&pinctrl {
+	uart1_default: uart1_default {
+		group1 {
+			pinmux = <UART1_TX_GPIO21>;
+			output-high;
+		};
+		group2 {
+			pinmux = <UART1_RX_GPIO20>;
+			bias-pull-up;
+		};
+	};
+
+	spim2_default: spim2_default {
+		group1 {
+			pinmux = <SPIM2_MISO_GPIO8>,
+				 <SPIM2_SCLK_GPIO10>;
+		};
+		group2 {
+			pinmux = <SPIM2_MOSI_GPIO7>;
+			output-low;
+		};
+	};
+
+	i2c0_default: i2c0_default {
+		group1 {
+			pinmux = <I2C0_SDA_GPIO5>,
+				 <I2C0_SCL_GPIO6>;
+			bias-pull-up;
+			drive-open-drain;
+			output-high;
+		};
+	};
+};