@startuml
skinparam BackgroundColor F0F0F0

service_eInk -> eInkSentinel : SetFrequencyValueRequest
eInkSentinel -> PowerManager : RequestCpuFrequencyMessage

PowerManager -> CpuGovernor : SetCpuFrequencyRequest

service_eInk -> EinkDisplay : powerOn
EinkDisplay -> driverLPSPI : Enable

driverLPSPI -> driverPLL2 : Pll2ClockEnable
note right
Critical section!
mutex necessary
end note

driverLPSPI -> clock_config : LPSPIClockEnable

...screen redraw...
 
EinkDisplay -> driverLPSPI : Disable
 
driverLPSPI -> clock_config : LPSPIClockDisable

driverLPSPI -> driverPLL2 : Pll2ClockDisable
note right
Critical section!
mutex necessary
end note

service_eInk -> eInkSentinel : ResetCpuFrequencyRequest
eInkSentinel -> PowerManager : RequestCpuFrequencyMessage

PowerManager -> CpuGovernor : ResetCpuFrequencyRequest

@enduml
 



@startuml

service_cellular -> cellularSentinel : SetFrequencyValueRequest
cellularSentinel -> PowerManager : RequestCpuFrequencyMessage

PowerManager -> CpuGovernor : SetCpuFrequencyRequest

service_cellular -> bsp_cellular : wakeUp
bsp_cellular -> driverUART : Enable

driverUART -> clock_config : ExternalOscillatorEnable
note right
Critical section!
mutex necessary
end note

driverUART -> clock_config : UARTClockEnable

...call ended...
 
bsp_cellular -> driverUART : Disable
 
driverUART -> clock_config : UARTClockDisable

service_cellular -> cellularSentinel : ResetCpuFrequencyRequest
cellularSentinel -> PowerManager : RequestCpuFrequencyMessage

PowerManager -> CpuGovernor : ResetCpuFrequencyRequest

@enduml