lab-rv32i-freertos-c-event-groups/doc/card-plan.md

FC09 card plan — Event Groups

Thesis

An EventGroup is a bit protocol, not a counter. ALL/ANY, clear-on-exit and barrier auto-clear are part of the protocol and must be visible in evidence.

FC09 · Event Groups
└── Task01 · READY latch + three-party barrier
    ├── A2/A4 · disjoint masks and participants
    ├── A5 · E01–E11 deterministic flow
    ├── A6 · bit value and blocked-task states
    ├── A7 · handle, wait lists, three stacks and digest
    ├── A8 · ANY/ALL/clear/sync decisions
    └── Exercise · compare ANY and ALL on the same trace

Acceptance requires a real EventGroup, finite timeouts, coordinator blocked on the partial READY mask, worker A blocked at sync, all three xEventGroupSync results containing 0x70, final bits zero and deterministic E01–E11.