Add LimeSDR support via WebUSB and LMS7002M driver

[jLynx]

Description

This PR introduces native support for LimeSDR devices (USB, Mini, and Mini v2) using the WebUSB API. It includes a from-scratch implementation of the LMS64C protocol and LMS7002M transceiver configuration, enabling high-bandwidth SDR capabilities directly in the browser.

Key Changes

1. LimeSDR Driver Implementation

• LMS64C Protocol: Added a protocol layer to handle command packets, SPI reads/writes, and FPGA register access over USB bulk endpoints.
• LMS7002M Control: Implemented chip initialization, including:
  • CGEN & SX PLL Tuning: Automatic VCO selection and CSW (Capacitor Switch) sweeping to ensure frequency locks.
  • Analog Frontend (RFE/RBB): Support for manual gain control (LNA, TIA, PGA) and antenna path switching (LNAW, LNAL, LNAH).
  • Digital Signal Processing: Configuration of the RXTSP for DC offset correction to eliminate the "DC spike" at the center frequency.
• FPGA Gateware Sync: Added logic to configure FPGA PLLs for phase-aligned DDR data capture, matching LimeSuite's timing calculations.

2. Streaming & Performance

• SISO DDR Mode: Configured the device for Single-Input Single-Output Double Data Rate mode to maximize bandwidth for a single channel.
• Optimized Buffering: Implemented a multi-threaded transfer loop using 8 concurrent USB requests with 256KB buffers (matching HackRF logic) to prevent dropped samples at high sample rates (up to 30 MSPS).
• Sample Conversion: Optimized the conversion of 12-bit wire samples to 8-bit integers by using a 4-bit right shift to preserve maximum dynamic range.

3. UI & Framework Enhancements

• New Control Type: Added select type to the GainControl interface to support labeled dropdowns (used for Antenna selection).
• Spectrum Smoothing: Refactored the FFT throttling logic in rx-stream.ts from frame-skipping to time-based intervals (performance.now()) to ensure a consistent 20 FPS waterfall across different device callback rates.
• Audio Pipeline: Removed the audio batch threshold in the mixer to allow smoother playback for devices that emit larger, less frequent USB packets.

Supported Hardware

• LimeSDR-USB (VID: 0x04B4, PID: 0x00F1)
• LimeSDR-Mini / v2 (VID: 0x1D50, PID: 0x6108)

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Verified Functionality

• Device detection and WebUSB claiming.
• Frequency tuning across HF/VHF/UHF ranges.
• Successful VCO locking on CGEN and SXR.
• Sample rates tested up to 30 MSPS without overflow.
• Manual gain and antenna switching.

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	browsdr	e28be37	Commit Preview URL Branch Preview URL	Apr 01 2026, 08:16 AM

[jLynx]

It kind of works, but having reflection issues and issues where the frequencies dont quite match up