third_party/NordicSemiconductor/drivers/doc/diagrams/sequence/tx_unicast.uml

@startuml

participant RADIO
participant Driver
participant State
participant Mutex

      -> State: WaitingRxFrame
      
Higher_Layer -> Driver: transmit()

Driver  -> Mutex: lock
activate Mutex
Driver  -> RADIO:  TASK: STOP
Driver  -> RADIO:  set_channel(tx_channel)
Driver  -> Driver: stopSendingAck(Cca)
Driver  -> RADIO:  set_tx_power(tx_power)
Driver  -> RADIO:  clear_event(END)
Driver  -> RADIO:  clear_event(READY)

RADIO   -> Driver: EV: DISABLED
Driver  -> RADIO:  TASK: RXEN

RADIO   -> Driver: EV: READY
Driver  -> State:  TxFrame
Driver  -> RADIO:  enable_txframe_shorts()
Driver  -> RADIO:  TASK: CCASTART

RADIO   -> RADIO:  EV: CCAIDLE / TASK: TXEN
RADIO   -> RADIO:  EV: READY / TASK: START
activate RADIO

RADIO   -> Driver: EV: FRAMESTART

RADIO   -> RADIO:  EV: END / TASK: DISABLE
deactivate RADIO
RADIO   -> Driver: EV: END
Driver  -> RADIO:  disable_txframe_shorts()
Driver  -> Driver: Ack requested? true
Driver  -> State:  RxAck

RADIO   -> Driver: EV: DISABLED
Driver  -> RADIO:  TASK: RXEN

RADIO   -> Driver: EV: READY
Driver  -> RADIO:  TASK: START

RADIO   -> Driver: EV: FRAMESTART
activate RADIO
RADIO   -> Driver: EV: END
deactivate RADIO
Driver  -> Driver: ACK matched? false
Driver  -> RADIO:  TASK: START

RADIO   -> Driver: EV: FRAMESTART
activate RADIO
RADIO   -> Driver: EV: END
deactivate RADIO
Driver  -> Driver: ACK matched? true
Driver  -> State:  WainingRxFrame
Driver  -> RADIO:  enable_tifs_shorts()
Driver  -> RADIO:  TASK: START
Driver  -> Mutex:  unlock
deactivate Mutex

Driver  -> Higher_Layer: transmitted()

@enduml