165 lines
4.2 KiB
Markdown
165 lines
4.2 KiB
Markdown
# Barnum - RP2040-ETH WS2812 Network Control
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A network-controllable WS2812 LED system built on the Waveshare RP2040-ETH board. Control LED colors over ethernet using simple TCP commands.
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## Features
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- **Network Control**: TCP server accepting color commands over ethernet
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- **Visual Feedback**:
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- Green flash every 1s (firmware alive indicator)
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- Amber flash on network traffic (RX/TX activity)
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- Smooth color transitions between commands
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- **Real-time Response**: Immediate color changes with network acknowledgments
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- **Debug Output**: Comprehensive serial logging for troubleshooting
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## Hardware
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- **Board**: Waveshare RP2040-ETH
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- **LED**: WS2812/NeoPixel connected to GPIO 25
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- **Ethernet**: CH9120 chip with built-in TCP/IP stack
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- **Power**: USB-C for programming, external power for LED strips
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## Pin Configuration
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| Function | GPIO | Description |
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|----------|------|-------------|
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| WS2812 Data | 25 | LED strip data line |
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| UART TX (CH9120) | 20 | Serial to ethernet chip |
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| UART RX (CH9120) | 21 | Serial from ethernet chip |
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| CFG (CH9120) | 18 | Configuration mode pin |
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| RES (CH9120) | 19 | Reset pin for ethernet chip |
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## Network Configuration
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- **IP Address**: 192.168.1.201
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- **Subnet Mask**: 255.255.0.0
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- **Gateway**: 192.168.1.1
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- **Mode**: TCP Server
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- **Port**: 1000
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## Supported Commands
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Send these as TCP messages to port 1000:
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| Command | Effect |
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|---------|--------|
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| `RED` | Set LED to red |
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| `GREEN` | Set LED to green |
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| `BLUE` | Set LED to blue |
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| `WHITE` | Set LED to white |
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| `OFF` | Turn LED off |
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| `RGB:r,g,b` | Custom color (e.g., `RGB:255,128,0` for orange) |
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## Building
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```bash
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# Setup (first time)
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git clone <this-repo>
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cd barnum
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# Build
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mkdir -p build
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cd build
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cmake ..
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make barnum
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# Flash
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# 1. Hold BOOTSEL button on RP2040-ETH
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# 2. Connect USB-C cable
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# 3. Copy barnum.uf2 to RPI-RP2 drive
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# 4. Board reboots automatically
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```
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## Usage Examples
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### Python Client
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```python
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import socket
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sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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sock.connect(('192.168.1.201', 1000))
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sock.send(b'RED')
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response = sock.recv(1024)
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print(response.decode()) # "Setting color to R:255 G:0 B:0"
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sock.close()
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```
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### Command Line
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```bash
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# Test with netcat
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echo "BLUE" | nc 192.168.1.201 1000
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# Test with included Python client
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python3 test_client.py GREEN
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python3 test_client.py "RGB:255,0,255"
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```
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### Network Testing
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```bash
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# Basic connectivity
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ping 192.168.1.201
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# Port scan
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python3 test_ethernet.py
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# Network discovery
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python3 network_scan.py
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```
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## Visual Indicators
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1. **Startup**: 3 blue flashes (ethernet initialization)
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2. **Alive**: Green flash every 1 second (firmware running)
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3. **Traffic**: Amber flash on network activity
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4. **Commands**: Smooth color transitions to target colors
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## Project Structure
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```
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barnum/
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├── barnum.c # Main application (network + LED control)
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├── barnum-initial.c # Original LED cycling demo
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├── ch9120.c/.h # CH9120 ethernet chip driver
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├── ws2812.pio # PIO program for WS2812 timing
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├── CMakeLists.txt # Build configuration
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├── test_client.py # Python test client
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├── test_ethernet.py # Network diagnostics
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├── network_scan.py # Network discovery tool
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├── README_ETH.md # Ethernet implementation details
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└── rp-2040.md # Hardware documentation
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```
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## Troubleshooting
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### No Network Connectivity
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1. Check ethernet cable connection
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2. Verify green/amber LEDs on RJ45 connector
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3. Monitor serial output for configuration errors
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4. Ensure IP settings match your network
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### LED Not Responding
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1. Verify WS2812 connection to GPIO 25
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2. Check power supply to LED strip
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3. Look for "Received command" in serial output
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### Build Issues
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1. Ensure Pico SDK is properly installed
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2. Check board type in CMakeLists.txt
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3. Verify pico_sdk_import.cmake is present
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## Development Notes
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- Built with Pico SDK 2.1.1
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- Uses PIO for precise WS2812 timing
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- CH9120 handles TCP/IP stack entirely
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- Dual-core RP2040 allows concurrent LED/network operations
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- Serial debug output at 115200 baud
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## Future Enhancements
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- Multiple LED support
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- Animation patterns
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- Web interface
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- MQTT integration
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- Color persistence
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- Network configuration via commands |