@startuml
!include card-uml-style.iuml
scale 900 width
left to right direction

class "01  PeriodicContext" as Periodic <<C struct>> {
  handle · created_handle
  phase
  initial_tick
  release_tick[3]
  entry_sp · stack range
}

class "02  SuspendContext" as Suspend <<C struct>> {
  handle · created_handle
  phase
  resumed
  entry_sp
}

class "03  ObserverContext" as Observer <<C struct>> {
  handle
  periodic_state : eTaskState
  suspend_state : eTaskState
  pass
}

class "04  periodic timeline" as Timeline <<bounded record>> {
  t0
  t0 + 2
  t0 + 4
  t0 + 6
}

Periodic --> Timeline : vTaskDelayUntil
Observer --> Periodic : eTaskGetState
Observer --> Suspend : eTaskGetState · vTaskResume
Observer --> Timeline : verifies exact deltas
@enduml