@startuml
[*] --> F0 : reset/power-up

state "Blink frequency\nstates" as BlinkFreq {
  state F0
  state F10
  state F20
  state F30
  state F40
  state F50
}

' --- Notes ---

note right of F0
  freq_idx = 0
  f = 0 Hz (LED заморожен)
  step_cnt считает до STEP_4SEC_MAX
end note

note right of F10
  freq_idx = 1
  f = 10 Hz
  max_count = F_CLK/(2*10)-1
  step_cnt считает до STEP_2SEC_MAX
end note

note right of F20
  freq_idx = 2
  f = 20 Hz
  max_count = F_CLK/(2*20)-1
  step_cnt считает до STEP_4SEC_MAX
end note

note right of F30
  freq_idx = 3
  f = 30 Hz
  max_count = F_CLK/(2*30)-1
  step_cnt считает до STEP_4SEC_MAX
end note

note right of F40
  freq_idx = 4
  f = 40 Hz
  max_count = F_CLK/(2*40)-1
  step_cnt считает до STEP_4SEC_MAX
end note

note right of F50
  freq_idx = 5
  f = 50 Hz
  max_count = F_CLK/(2*50)-1
  step_cnt считает до STEP_4SEC_MAX
end note

' --- Transitions ---

F0  --> F10 : step_cnt >= STEP_4SEC_MAX
F10 --> F20 : step_cnt >= STEP_2SEC_MAX
F20 --> F30 : step_cnt >= STEP_4SEC_MAX
F30 --> F40 : step_cnt >= STEP_4SEC_MAX
F40 --> F50 : step_cnt >= STEP_4SEC_MAX
F50 --> F0  : step_cnt >= STEP_4SEC_MAX

F0 --> [*] : external reset
@enduml