ST STM32F2 User Manual

UM1940
LL RTC Generic Driver
DocID028236 Rev 2
1117/1371
LL_RTC_EnterInitMode
Function name
ErrorStatus LL_RTC_EnterInitMode (RTC_TypeDef * RTCx)
Function description
Enters the RTC Initialization mode.
Parameters
RTCx: RTC Instance
Return values
An: ErrorStatus enumeration value:
SUCCESS: RTC is in Init mode
ERROR: RTC is not in Init mode
Notes
The RTC Initialization mode is write protected, use the
LL_RTC_DisableWriteProtection before calling this function.
LL_RTC_ExitInitMode
Function name
ErrorStatus LL_RTC_ExitInitMode (RTC_TypeDef * RTCx)
Function description
Exit the RTC Initialization mode.
Parameters
RTCx: RTC Instance
Return values
An: ErrorStatus enumeration value:
SUCCESS: RTC exited from in Init mode
ERROR: Not applicable
Notes
When the initialization sequence is complete, the calendar
restarts counting after 4 RTCCLK cycles.
The RTC Initialization mode is write protected, use the
LL_RTC_DisableWriteProtection before calling this function.
LL_RTC_WaitForSynchro
Function name
ErrorStatus LL_RTC_WaitForSynchro (RTC_TypeDef * RTCx)
Function description
Waits until the RTC Time and Day registers (RTC_TR and
RTC_DR) are synchronized with RTC APB clock.
Parameters
RTCx: RTC Instance
Return values
An: ErrorStatus enumeration value:
SUCCESS: RTC registers are synchronised
ERROR: RTC registers are not synchronised
Notes
The RTC Resynchronization mode is write protected, use the
LL_RTC_DisableWriteProtection before calling this function.
To read the calendar through the shadow registers after
Calendar initialization, calendar update or after wakeup from
low power modes the software must first clear the RSF flag.
The software must then wait until it is set again before reading
the calendar, which means that the calendar registers have
been correctly copied into the RTC_TR and RTC_DR shadow
registers.
64.3 RTC Firmware driver defines
64.3.1 RTC
ALARM OUTPUT

ST STM32F2 Specifications

General

Brand	ST
Model	STM32F2
Category	Microcontrollers
Language	English