machine/attiny85: add USI-based SPI support#5181

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deadprogram merged 8 commits intotinygo-org:devfrom

jespino:attiny85-spi-support

Jan 17, 2026

Commits on Jan 17, 2026

machine/attiny85: minimize SPI RAM footprint

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Revert "machine/attiny85: minimize SPI RAM footprint"

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machine/attiny85: reduce SPI RAM usage by 10 bytes

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