Implement complete firmware for LilyGO T-Embed CC1101 RF analysis tool

.gitignore

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+# PlatformIO
+.pio
+.pioenvs
+.piolibdeps
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch
+
+# Build artifacts
+*.bin
+*.elf
+*.map
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Temporary files
+*.tmp
+*.bak
+*.log

BUILD.md

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+# Build Instructions
+
+## Prerequisites
+
+1. **Install PlatformIO**
+   - Install [Visual Studio Code](https://code.visualstudio.com/)
+   - Install the PlatformIO IDE extension from the VSCode marketplace
+   - Alternatively, install PlatformIO Core CLI
+
+2. **Hardware Requirements**
+   - LilyGO T-Embed CC1101 board
+   - USB-C cable for programming and power
+   - Antenna (optional but recommended for better range)
+
+## Building the Firmware
+
+### Using Visual Studio Code + PlatformIO
+
+1. Open the project folder in VSCode:
+   ```bash
+   cd ultimatel-ily
+   code .
+   ```
+
+2. PlatformIO will automatically detect the project and install dependencies
+
+3. Click the Build button (checkmark icon) in the PlatformIO toolbar
+   - Or use: `Ctrl+Alt+B` (Windows/Linux) / `Cmd+Alt+B` (Mac)
+   - Or run: `pio run` in the terminal
+
+4. Wait for the build to complete. First build will take longer as it downloads libraries.
+
+### Using PlatformIO CLI
+
+1. Navigate to the project directory:
+   ```bash
+   cd ultimatel-ily
+   ```
+
+2. Build the firmware:
+   ```bash
+   platformio run
+   ```
+
+3. The compiled firmware will be in `.pio/build/lilygo-t-embed-cc1101/`
+
+## Flashing the Firmware
+
+### Automatic Upload
+
+1. Connect your T-Embed to your computer via USB-C
+
+2. The board should appear as a serial device:
+   - Linux: `/dev/ttyUSB0` or `/dev/ttyACM0`
+   - Mac: `/dev/cu.usbserial-*`
+   - Windows: `COM3`, `COM4`, etc.
+
+3. Upload the firmware:
+   - VSCode: Click the Upload button (arrow icon) in PlatformIO toolbar
+   - CLI: `platformio run --target upload`
+
+4. Wait for the upload to complete
+
+### Manual Upload (if automatic fails)
+
+1. Put the ESP32-S3 into download mode:
+   - Hold the BOOT button
+   - Press and release the RESET button
+   - Release the BOOT button
+
+2. Run the upload command again
+
+### Troubleshooting Upload Issues
+
+**Device not detected:**
+- Install USB-to-Serial drivers (usually CP210x or CH340)
+- Try a different USB cable (some cables are power-only)
+- Check if the device appears in device manager/system
+
+**Permission denied (Linux):**
+```bash
+sudo usermod -a -G dialout $USER
+# Log out and back in
+```
+
+**Upload fails:**
+- Try putting the board in download mode manually
+- Reduce upload speed in platformio.ini: `upload_speed = 115200`
+- Check USB cable quality
+
+## Monitoring Serial Output
+
+To view debug output and logs:
+
+### Using PlatformIO
+
+```bash
+platformio device monitor
+```
+
+Or click the Serial Monitor icon in VSCode
+
+### Using Other Tools
+
+```bash
+# Linux/Mac
+screen /dev/ttyUSB0 115200
+
+# Or use minicom
+minicom -D /dev/ttyUSB0 -b 115200
+```
+
+On Windows, use PuTTY or Tera Term.
+
+## Customizing the Build
+
+### Changing Pin Assignments
+
+Edit `include/config.h` to modify pin definitions:
+
+```cpp
+#define CC1101_CS_PIN 10
+#define TFT_CS_PIN 9
+// etc.
+```
+
+### Adjusting Display Settings
+
+Edit `include/User_Setup.h` for display-specific settings.
+
+### Modifying Build Flags
+
+Edit `platformio.ini` to change compiler flags or add features:
+
+```ini
+build_flags = 
+    -DCORE_DEBUG_LEVEL=5  ; More verbose logging
+    -DBOARD_HAS_PSRAM
+```
+
+## Build Artifacts
+
+After a successful build, you'll find:
+
+- **firmware.bin** - The main firmware binary
+- **firmware.elf** - ELF file with debug symbols
+- **partitions.bin** - Partition table
+
+These are located in `.pio/build/lilygo-t-embed-cc1101/`
+
+## Clean Build
+
+To clean all build artifacts and start fresh:
+
+```bash
+platformio run --target clean
+```
+
+## Dependencies
+
+The build system will automatically download:
+- ESP32 Arduino framework
+- TFT_eSPI library
+- CC1101 driver library
+- ArduinoJson library
+
+First build may take 5-10 minutes depending on your internet connection.
+
+## Verification
+
+After flashing:
+
+1. The display should show the splash screen
+2. Serial output should show initialization messages
+3. Main menu should appear after ~2 seconds
+4. Device should be ready for use
+
+If the display doesn't work, check:
+- TFT pin definitions
+- Display backlight (GPIO 15)
+- SPI connections
+
+If the RF module doesn't work:
+- Check CC1101 pin definitions
+- Verify SPI bus configuration
+- Check antenna connection