first and compiling freertos

docs/hardware/rp2040-eth-specs.md

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+# RP2040-ETH Hardware Specifications
+
+## Overview
+The Waveshare RP2040-ETH is a compact module based on the RP2040 microcontroller with integrated Ethernet connectivity via the CH9120 controller.
+
+## Core Specifications
+- **Processor**: Dual-core Arm Cortex M0+
+- **Clock Speed**: Up to 133 MHz
+- **SRAM**: 264KB internal
+- **Flash**: 4MB onboard
+- **Ethernet Controller**: CH9120 with integrated TCP/IP stack
+
+## Pin Configuration
+- **GPIO**: 14 multi-function pins
+- **SPI**: 1x SPI0
+- **I2C**: 2x interfaces
+- **UART**: 2x interfaces
+- **PWM**: 13 channels
+- **PIO**: 8 Programmable I/O state machines
+
+## Network Features
+- **Controller**: CH9120
+- **Modes Supported**:
+  - TCP Server
+  - TCP Client
+  - UDP Server
+  - UDP Client
+- **Configuration**: Via host software or serial commands
+
+## Physical Design
+- Castellated module design
+- Type-C USB connector
+- Ethernet interface
+- Compatible with some Raspberry Pi Pico HATs
+
+## Power Requirements
+- USB powered via Type-C
+- Operating voltage: 3.3V I/O
+
+## Additional Features
+- Built-in temperature sensor
+- Drag-and-drop programming via USB
+- MicroPython, C/C++, and Arduino IDE support