ports/stm: add audioio.AudioOut for STM32F405/F407#10976

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ChrisNourse wants to merge 16 commits intoadafruit:mainfrom

ChrisNourse:feature/add_audioio_to_stm32

Commits on May 2, 2026

ports/stm: add DAC-based audioio.AudioOut for STM32F405/F407

Chris Nourse
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claude
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tests: add audioio manual test suite for STM32F405/F407

Chris Nourse
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ports/stm: add stereo output via DAC CH2 (PA05/A1) for STM32F405

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tests: add stereo test and cross-platform support to audioio suite

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ports/stm: track source position across DMA half-fills in audioio

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ports/stm: enlarge audioio DMA buffer to 2048 samples

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ports/stm: round-to-nearest TIM6 period in audioio

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ports/stm: ramp into first sample on audioio play start

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ports/stm: queue DMA halves via bitmask + grow audioio buffer

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Commits on May 3, 2026

ports/stm: harden audioio review fixes + bump DMA to VERY_HIGH
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tests: harden audioio runner + clean up manual test docs
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ports/stm: note atmel-samd freq bias near TIM6 round-to-nearest

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claude
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tests: pre-flight CIRCUITPY free-space check in audioio runner

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tests: capture audioio runner results from F405 (all 5 PASS)

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tests: drop manual soft-reset test from audioio suite

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Commits on May 4, 2026

chore: pre-commit fixups (locale, ruff-format, trailing whitespace)

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