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baa3ef7690
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3-board relay firmware: sink + I2S + dual source
Implements the only architecture that can relay iPhone audio to two BT
speakers at once (one ESP32 cannot be A2DP sink+source, and a source holds
only one link):
iPhone ))BT)) [Board A: A2DP sink -> I2S master]
==I2S bus==> [Board B: I2S slave -> A2DP source] ))BT)) JBL
==I2S bus==> [Board C: I2S slave -> A2DP source] ))BT)) Cardo
- src/board_sink.cpp : A2DP sink "BikeAudio", forwards decoded PCM to an
I2S master bus (BCK=5, WS=25, DATA=23); follows negotiated sample rate.
- src/board_source.cpp : I2S slave (BCK=19, WS=18, DATA=22) -> A2DP source,
target speaker via TARGET_SPEAKER build flag; pads silence on underrun.
- platformio.ini : 3 envs (sink, source_jbl, source_cardo) sharing an
[env] base; sources differ only by TARGET_SPEAKER. build_src_filter selects
the per-board source file. Libs pinned as before.
- README_RELAY.md : wiring table, I2S bus topology, flash order, pairing,
and the speaker-sync limitation.
Replaces the single-board src/main.cpp (architecturally impossible). All
three envs build clean. Hardware flash + wiring next.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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2026-06-10 11:35:12 -04:00 |
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