🧠 ESP32-Dev Board Support for Zephyr RTOS

This repository contains the board support files for the ESP32-Dev, a custom ESP32-based development board designed to work with the Zephyr RTOS. It includes a Device Tree source file that defines peripheral mappings, memory regions, and GPIO configurations specific to this board.

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📌 Board Features

Feature	Description
SoC	ESP32-D0WD-V3 (Xtensa dual-core)
UART0	Console output (115200 baud)
UART1	Available (115200 baud)
UART2	Used for Modbus with DE pin on GPIO5
I²C0	SDA: GPIO21, SCL: GPIO22 (Open-drain)
Buttons	Button 0: GPIO1_1, Button 1: GPIO0_25
Wi-Fi	Enabled
Bluetooth	HCI interface enabled
Flash	4MB external SPI flash
SRAM	Configured and mapped

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Setup Instructions

1. Set up Zephyr workspace

If you haven't already set up your Zephyr workspace:

west init zephyr-workspace
cd zephyr-workspace
west update
west zephyr-export

2. Add the board files

Place all files from this repository inside the following directory:

zephyr-workspace/boards/espressif/esp32_dev/

Your folder structure should look like:

zephyr-workspace/
└── boards/
    └── espressif/
        └── esp32_dev/
            ├── board.cmake
            ├── board.yml
            ├── esp32_dev-pinctrl.dtsi
            ├── esp32_dev_appcpu.dts
            ├── esp32_dev_appcpu.yaml
            ├── esp32_dev_appcpu_defconfig
            ├── esp32_dev_procpu.dts
            ├── esp32_dev_procpu.yaml
            ├── esp32_dev_procpu_defconfig
            ├── Kconfig
            ├── Kconfig.esp32_dev
            └── Kconfig.sysbuild

3. Build a sample application

west build -b esp32_dev/esp32/procpu samples/hello_world

4. Flash the firmware

west flash

5. Monitor serial output

west espressif monitor