feat: add TX writeStream with loopback buffer for TX→RX testing #3
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Adds full TX (transmit) support to the loopback driver with a shared ring buffer that allows data written to TX to appear on RX. This enables end-to-end testing of SDR applications without hardware. Changes: - Add writeStream implementation that copies data to loopback buffer - Add loopback ring buffer with mutex/condvar synchronization - Modify acquireReadBuffer to read from loopback buffer when enabled - Fix readStream to copy data to user's output buffer - Set getFullDuplex to return true for simultaneous TX/RX - Bump CMake minimum version to 3.10 The loopback assumes CF32 format (8 bytes per complex sample). 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
In loopback mode, _loopback_count is already decremented in acquireReadBuffer, so releaseReadBuffer should not decrement _buf_count. This was causing counter underflow which led to memory corruption. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Previously the loopback only supported CF32 (hardcoded 8 bytes/sample). Now it stores the format from setupStream and uses the correct bytes per sample for CS8 (2), CS12 (3), CS16 (4), and CF32 (8). 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Adds full TX (transmit) support to the loopback driver with a shared ring buffer that allows data written to TX to appear on RX. This enables end-to-end testing of SDR applications without hardware.
Changes:
🤖 Generated with Claude Code
I confirmed it works with SoapySDR