blue
baa3ef7690
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>
40 lines
1.5 KiB
INI
40 lines
1.5 KiB
INI
; BikeAudio — 3-board relay (iPhone -> Board A sink -> I2S -> Boards B/C sources -> JBL + Cardo)
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;
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; One ESP32 cannot be an A2DP sink and source at once, and an A2DP source can
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; reach only one speaker — so the work is split across three boards that share
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; an I2S bus. See README.md for wiring and the flash order.
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;
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; Build all: pio run
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; Build one board: pio run -e sink | -e source_jbl | -e source_cardo
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;
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; Common specs preserved from the original sketch: ESP32 Arduino core 2.0.x via
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; espressif32 ~6.6.0, esp32dev, huge_app partition (BT stack), 115200 monitor.
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[platformio]
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default_envs = sink, source_jbl, source_cardo
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[env]
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platform = espressif32 @ ~6.6.0
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board = esp32dev
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framework = arduino
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board_build.partitions = huge_app.csv
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monitor_speed = 115200
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; pschatzmann libs pinned to exact commits (ESP32-A2DP 1.8.11, audio-tools 1.2.4)
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lib_deps =
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https://github.com/pschatzmann/ESP32-A2DP#42601717cd70d5300c9b519f3c2bf1d64d77ea2b
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https://github.com/pschatzmann/arduino-audio-tools#64b64dcb9bde18a0a17766eeb6529c3a53d920a8
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; --- Board A: A2DP sink (iPhone) -> I2S master --------------------------------
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[env:sink]
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build_src_filter = +<board_sink.cpp>
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; --- Board B: I2S slave -> A2DP source -> JBL Charge 5 ------------------------
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[env:source_jbl]
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build_src_filter = +<board_source.cpp>
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build_flags = '-DTARGET_SPEAKER="JBL Charge 5"'
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; --- Board C: I2S slave -> A2DP source -> Cardo (Tangerine EDGE) --------------
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[env:source_cardo]
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build_src_filter = +<board_source.cpp>
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build_flags = '-DTARGET_SPEAKER="Tangerine EDGE"'
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