HAL VREFBUF Use Cases ¶ Typical Use Case ¶ Called functions: HAL_VREFBUF_SetConfig() Change Single Parameter During Application Lifetime ¶ Called functions: HAL_VREFBUF_SetConfig() HAL_VREFBUF_SetVoltageScale() HAL_VREFBUF_SetMode() Configure Trimming Value ¶ Called functions: HAL_VREFBUF_SetConfig() HAL_VREFBUF_GetTrimming() HAL_VREFBUF_SetTrimming()
STM32H7Pxx HAL Drivers
![@startuml
"User Application" -> "Driver System" : HAL_Init()
"Driver System" --> "User Application"
"User Application" -> "Driver RCC" : HAL_RCC_VREFBUF_EnableClock()
"Driver RCC" --> "User Application"
"User Application" -> "Driver VREFBUF" : HAL_VREFBUF_SetConfig()
rnote over "Driver VREFBUF"
**If VREFBUF mode is Internal**
**Voltage Reference, wait until**
**its output voltage reaches**
**the expected value.**
endrnote
...
"Driver VREFBUF" --> "User Application"
rnote over "User Application"
**User can choose all options**
**or one of them or nothing**
end rnote
group Option 1 [Voltage scale]
"User Application" -> "Driver VREFBUF" : HAL_VREFBUF_SetVoltageScale()
rnote over "Driver VREFBUF"
If VREFBUF mode is Internal
Voltage Reference, wait until
its output voltage reaches
the expected value.
endrnote
...
"Driver VREFBUF" --> "User Application" :
end
group Option 2 [Functional Mode]
"User Application" -> "Driver VREFBUF" : HAL_VREFBUF_SetMode()
rnote over "Driver VREFBUF"
If VREFBUF mode is Internal
Voltage Reference, wait until
its output voltage reaches
the expected value.
endrnote
...
"Driver VREFBUF" --> "User Application" :
end
@enduml](../../../../_images/plantuml-881c5223a99bf5cb236ec91986157d5d43bd0391.png)
![@startuml
"User Application" -> "Driver System" : HAL_Init()
"Driver System" --> "User Application"
"User Application" -> "Driver RCC" : HAL_RCC_VREFBUF_EnableClock()
"Driver RCC" --> "User Application"
"User Application" -> "Driver VREFBUF" : HAL_VREFBUF_SetConfig()
rnote over "Driver VREFBUF"
**If VREFBUF mode is Internal**
**Voltage Reference, wait until**
**its output voltage reaches**
**the expected value.**
endrnote
...
"Driver VREFBUF" --> "User Application" :
group Option [Trimming Value]
"User Application" -> "Driver VREFBUF" : HAL_VREFBUF_GetTrimming()
"Driver VREFBUF" --> "User Application" :
end
note right: **To get initial trimming configuration**
"User Application" -> "Driver VREFBUF" : HAL_VREFBUF_SetTrimming()
"Driver VREFBUF" --> "User Application" :
@enduml](../../../../_images/plantuml-c6e7caa3bddb0092353e8f4d3fad010c99f96221.png)