boards: riscv: Add support for WeAct Studio ESP32-C3-Mini

boards/weact/esp32c3_mini/Kconfig

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+# Copyright (c) 2025 Siratul Islam
+# SPDX-License-Identifier: Apache-2.0
+
+config HEAP_MEM_POOL_ADD_SIZE_BOARD
+	int
+	default 4096

boards/weact/esp32c3_mini/Kconfig.sysbuild

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+# Copyright (c) 2023 Espressif Systems (Shanghai) Co., Ltd.
+# Copyright (c) 2025 Siratul Islam
+# SPDX-License-Identifier: Apache-2.0
+
+choice BOOTLOADER
+	default BOOTLOADER_MCUBOOT
+endchoice
+
+choice BOOT_SIGNATURE_TYPE
+	default BOOT_SIGNATURE_TYPE_NONE
+endchoice

boards/weact/esp32c3_mini/Kconfig.weact_esp32c3_mini

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+# ESP32-C6-Mini board configuration
+
+# Copyright (c) 2025 Siratul Islam
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_WEACT_ESP32C3_MINI
+	select SOC_ESP32C3_FH4

boards/weact/esp32c3_mini/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/weact/esp32c3_mini/board.yml

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+board:
+  name: weact_esp32c3_mini
+  full_name: ESP32-C3-Mini
+  vendor: weact
+  socs:
+    - name: esp32c3

boards/weact/esp32c3_mini/doc/index.rst

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+.. zephyr:board:: weact_esp32c3_mini
+
+Overview
+********
+
+WeAct Studio ESP32-C3-Mini is a compact development board based on ESP32-C3FH4,
+featuring integrated Wi-Fi and Bluetooth® Low Energy connectivity.
+For more information, check `WeAct Studio ESP32-C3 Core Board`_.
+
+Hardware
+********
+
+ESP32-C3 is a single-core Wi-Fi and Bluetooth 5 (LE) microcontroller SoC,
+based on the open-source RISC-V architecture.
+
+The features include the following:
+
+- 32-bit core RISC-V microcontroller with a maximum clock speed of 160 MHz
+- 400 KB of internal RAM
+- 4 MB of internal flash (FH4 variant)
+- 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)
+- USB Serial/JTAG for flashing and debugging
+- On-board blue LED (GPIO8)
+- Boot button (GPIO9)
+
+For more information, check the datasheet at `ESP32-C3 Datasheet`_ or the technical reference
+manual at `ESP32-C3 Technical Reference Manual`_.
+
+Supported Features
+==================
+
+.. zephyr:board-supported-hw::
+
+System Requirements
+*******************
+
+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`.
+
+Programming and Debugging
+*************************
+
+.. zephyr:board-supported-runners::
+
+.. include:: ../../../espressif/common/building-flashing.rst
+   :start-after: espressif-building-flashing
+
+Debugging
+=========
+
+.. include:: ../../../espressif/common/openocd-debugging.rst
+   :start-after: espressif-openocd-debugging
+
+References
+**********
+
+.. target-notes::
+
+.. _`WeAct Studio ESP32-C3 Core Board`: https://github.com/WeActStudio/WeActStudio.ESP32C3CoreBoard
+.. _`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

boards/weact/esp32c3_mini/support/openocd.cfg

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+set ESP_RTOS none
+
+# ESP32C3 has built-in JTAG interface over USB port in pins GPIO18/GPIO19 (D-/D+).
+# Uncomment the line below to enable USB debugging.
+source [find interface/esp_usb_jtag.cfg]
+
+# Otherwise, use external JTAG programmer as ESP-Prog
+# source [find interface/ftdi/esp32_devkitj_v1.cfg]
+
+source [find target/esp32c3.cfg]
+adapter speed 5000

boards/weact/esp32c3_mini/weact_esp32c3_mini-pinctrl.dtsi

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+/*
+ * Copyright (c) 2025 Siratul Islam
+ *
+ * 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 {
+	uart0_default: uart0_default {
+		group1 {
+			pinmux = <UART0_TX_GPIO21>;
+			output-high;
+		};
+
+		group2 {
+			pinmux = <UART0_RX_GPIO20>;
+			bias-pull-up;
+		};
+	};
+
+	i2c0_default: i2c0_default {
+		group1 {
+			pinmux = <I2C0_SDA_GPIO0>,
+				 <I2C0_SCL_GPIO1>;
+			bias-pull-up;
+			drive-open-drain;
+			output-high;
+		};
+	};
+
+	spim2_default: spim2_default {
+		group1 {
+			pinmux = <SPIM2_MISO_GPIO3>,
+				 <SPIM2_SCLK_GPIO5>,
+				 <SPIM2_CSEL_GPIO6>;
+		};
+
+		group2 {
+			pinmux = <SPIM2_MOSI_GPIO4>;
+			output-low;
+		};
+	};
+};

boards/weact/esp32c3_mini/weact_esp32c3_mini.dts

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+/*
+ * Copyright (c) 2025 Siratul Islam
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+
+#include <espressif/esp32c3/esp32c3_fx4.dtsi>
+#include "weact_esp32c3_mini-pinctrl.dtsi"
+#include <zephyr/dt-bindings/input/input-event-codes.h>
+#include <espressif/partitions_0x0_default.dtsi>
+
+/ {
+	model = "WeAct Studio ESP32-C3-Mini";
+	compatible = "weact,esp32c3-mini";
+
+	chosen {
+		zephyr,sram = &sram1;
+		zephyr,console = &usb_serial;
+		zephyr,shell-uart = &usb_serial;
+		zephyr,flash = &flash0;
+		zephyr,code-partition = &slot0_partition;
+		zephyr,bt-hci = &esp32_bt_hci;
+	};
+
+	aliases {
+		sw0 = &button0;
+		led0 = &blue_led;
+		i2c-0 = &i2c0;
+		watchdog0 = &wdt0;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		blue_led: blue_led {
+			gpios = <&gpio0 8 GPIO_ACTIVE_LOW>;
+			label = "User LED";
+		};
+	};
+
+	gpio_keys {
+		compatible = "gpio-keys";
+
+		button0: button_0 {
+			label = "BOOT Button";
+			gpios = <&gpio0 9 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
+			zephyr,code = <INPUT_KEY_0>;
+		};
+	};
+};
+
+&uart0 {
+	status = "okay";
+	current-speed = <115200>;
+	pinctrl-0 = <&uart0_default>;
+	pinctrl-names = "default";
+};
+
+&usb_serial {
+	status = "okay";
+};
+
+&i2c0 {
+	status = "okay";
+	clock-frequency = <I2C_BITRATE_STANDARD>;
+	pinctrl-0 = <&i2c0_default>;
+	pinctrl-names = "default";
+};
+
+&trng0 {
+	status = "okay";
+};
+
+&spi2 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+	pinctrl-0 = <&spim2_default>;
+	pinctrl-names = "default";
+};
+
+&gpio0 {
+	status = "okay";
+};
+
+&wdt0 {
+	status = "okay";
+};
+
+&esp32_bt_hci {
+	status = "okay";
+};
+
+&wifi {
+	status = "okay";
+};

boards/weact/esp32c3_mini/weact_esp32c3_mini.yaml

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+identifier: weact_esp32c3_mini
+name: WeAct Studio ESP32-C3-Mini
+type: mcu
+arch: riscv
+toolchain:
+  - zephyr
+supported:
+  - adc
+  - gpio
+  - i2c
+  - i2s
+  - watchdog
+  - uart
+  - dma
+  - pwm
+  - spi
+  - counter
+  - entropy
+vendor: weact

boards/weact/esp32c3_mini/weact_esp32c3_mini_defconfig

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