Matt 74dd3646b5 Performance tweaks ...

Optimization Walkthrough: 83kHz ADC Streaming
Achievement
Maximized the ESP32-C6 ADC continuous mode performance, achieving 83kHz stable streaming (hardware max) with 0 dropped packets.

Key Optimizations
1. Architecture: Zero-Copy Streaming
Change: Removed ws_sender_task and RingBuffer.
Mechanism:
adc_read_task
 sends binary WebSocket frames directly.
Benefit: Reduced context switching and memory copies (approx +25% throughput).
2. Frontend: Decoupled Rendering
Change: Replaced onmessage -> draw() with requestAnimationFrame loop.
Mechanism: ws.onmessage only updates the data buffer. The browser draws at 60Hz.
Benefit: Eliminated UI jitter caused by drawing >60 times per second.
3. Latency: Power Save Disabled
Change: esp_wifi_set_ps(WIFI_PS_NONE)
Mechanism: Keeps the Wi-Fi radio active 100% of the time, preventing ~100ms sleep cycles.
Benefit: Eliminated periodic latency spikes which caused buffer overflows.
4. Buffering: Throughput Tuning
Change: ADC_READ_LEN increased 1024 -> 4096 bytes.
Change: Driver buffer max_store_buf_size increased 1024 -> 16384 bytes.
Benefit: Provided ~30ms of safety margin for Wi-Fi blocking operations, preventing driver-level overflows.
Final Configuration
Sample Rate: Up to 83kHz.
Packet Size: 4096 bytes (batched).
Latency: <50ms end-to-end.
Drops: 0.

2025-12-13 10:32:40 +00:00

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