Christian Werner
2015d4c96e
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Add row to "Decisions baked into the code" table explaining the DATA line
control design: all DATA assert/release operations in the worker and ATN ISR
go through iec_data_*_sync() under iec_data_lock to serialize the GPFSEL0
read-modify-write across CPUs. The release wrapper refuses to release while
ATN is asserted, preventing the ready-for-data release from erasing the ISR's
presence acknowledge — the bug that caused intermittently missed
LISTEN/UNLISTEN commands. Init/exit/self-test keep raw unconditional helpers.
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