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Change I2S Full Duplex Component - #3
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Replace the vendored i2s_audio (2026.9.0 + #16882 with local fixes) with 2026.9.1's i2s_audio plus the full duplex changes from #19959, the implementation on track upstream. The bus now allocates the TX/RX pair once at boot and initializes RX first, so RX drives the shared clocks and MCLK for the PCM1808. TX starts and stops with each playback session from a fresh preload, which keeps speaker timestamps exact without the old realign workaround. Only the PR's own changes are applied; its dev base needs a newer esp-audio-libs and audio_dac than 2026.9.1. Core.yaml is unchanged and already meets the PR's validation rules.
Drop the vendored i2s_audio and load full duplex straight from #19959, pinned to its head commit. The PR builds on ESPHome 2026.10, so: - min_version is now 2026.10.0b1, giving older ESPHome a clear error - build-beta.yml builds with ESPHome beta - CI and weekly checks skip stable until 2026.10.0 ships build.yml (main) stays on stable, so stable firmware can't be published on a beta ESPHome. Once #19959 ships in a release, remove the external_components block and restore stable in the workflows.
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Version: 26.10.8.1
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