@startuml
!include card-uml-style.iuml
scale 620 width
top to bottom direction

class "01  Application C\ntask01_first_task.c" as Application <<layer>>
class "02  FreeRTOS C API\nTaskFunction_t · xTaskCreate" as CAPI <<boundary>>
class "03  Kernel + RV32I port\nscheduler · tick · heap_4\nHazard3 CPU" as Runtime <<runtime>>

Application --> CAPI : requests tasks
CAPI --> Runtime : owns scheduling

note right of CAPI
  Public C contract.
  Application does not depend
  on TCB internals.
end note
@enduml