# ERT

**Repository Path**: chenxi666/ert

## Basic Information

- **Project Name**: ERT
- **Description**: No description available
- **Primary Language**: C
- **License**: MIT
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2026-04-22
- **Last Updated**: 2026-05-31

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# ERT

STM32G474xx Test Project

## Project Overview

This is an embedded test project based on the STM32G474CBTx microcontroller. The project integrates peripherals such as ADC, DAC, and USART, and implements USB CDC device functionality.

## Hardware Configuration

- **MCU**: STM32G474CBTx
- **Clock Frequency**: 170 MHz (ARM Cortex-M4 with FPU)
- **Flash**: 128 KB
- **SRAM**: 32 KB

## Peripheral Functions

| Peripheral | Description |
|------------|-------------|
| ADC1/ADC2 | 12-bit Analog-to-Digital Converters |
| DAC1 | 12-bit Digital-to-Analog Converter |
| USART1 | Asynchronous Serial Communication |
| USB | USB 2.0 Full-Speed Device (CDC Class) |
| GPIO | General-Purpose Input/Output |

## Project Structure

```
├── Core/                    # Core application code
│   ├── Inc/                 # Header files
│   │   ├── main.h
│   │   ├── adc.h
│   │   ├── dac.h
│   │   ├── gpio.h
│   │   └── usart.h
│   └── Src/                 # Source files
│       ├── main.c            # Main program
│       ├── test.c           # Test functions
│       ├── adc.c            # ADC configuration
│       ├── dac.c           # DAC configuration
│       ├── gpio.c          # GPIO configuration
│       └── usart.c         # USART configuration
├── USB_Device/              # USB device-related code
│   ├── App/
│   │   ├── usb_device.c    # USB initialization
│   │   ├── usbd_cdc_if.c  # CDC interface
│   │   └── usbd_desc.c    # Descriptors
│   └── Target/
│       └── usbd_conf.c    # USB configuration
├── Drivers/                 # Driver libraries
│   ├── CMSIS/              # CMSIS drivers
│   └── STM32G4xx_HAL_Driver/ # STM32 HAL drivers
└── Middlewares/             # Middleware
    └── STM32_USB_Device_Library/ # USB Device Library
```

## Compilation Instructions

### Environment Requirements

- GCC Arm Embedded Toolchain
- CMake 3.16+
- STM32CubeMX (optional, for generating .ioc configuration)

### Compilation Steps

```bash
# Create build directory
mkdir build && cd build

# Configure project
cmake ..

# Build
cmake --build .
```

## Usage Instructions

1. Flash the firmware to the development board using an ST-Link or J-Link debugger.
2. Connect the USB port to a PC; it will be recognized as a CDC virtual serial port device.
3. Use a serial debugging tool to perform communication tests.

## Communication Protocol

This project supports a USB CDC binary-frame protocol and currently implements the `DISCOVER` command handling.

- `DISCOVER` command: the host sends a frame with a zeroed destination address and an empty payload; the device replies with `DISCOVER_ACK`.
- `DISCOVER_ACK` frame: the device places its 96-bit UID in the `SRC` field and returns a success status.
- CRC verification: CRC-16/MODBUS is used (see `Docs/协议.md`).

> The current firmware parses received USB CDC frames, validates the header and CRC, and replies with the device UID when `CMD == 0x01` and `LEN == 0x0000`.

## License

MIT License