AN3371 datasheet(34/45 Pages) STMICROELECTRONICS

34 / 45 page

RTC firmware driver API

AN3371

34/45

Doc ID 018624 Rev 5

Note:

After a reset, the backup domain (RTC registers, RTC backup data registers and backup

SRAM) is protected against any possible unwanted write access. To enable access to the

RTC domain and RTC registers:

–

Enable the Power Controller (PWR) APB1 interface clock using the

RCC_APB1PeriphClockCmd() function.

–

Enable the access to the RTC domain using the PWR_BackupAccessCmd()

function on STM32F2xx and STM32F4xx devices, or the PWR_RTCAccessCmd()

function on STM32L1xx, STM32F0xx and STM32F3xx devices.

–

Select the RTC clock source using the RCC_RTCCLKConfig() function.

–

Enable RTC Clock using the RCC_RTCCLKCmd() function.

3.1.1

Time and date configuration

To configure the RTC Calendar (Time and Date), use the

RTC_SetTime() and

RTC_SetDate() functions.

To read the RTC Calendar, use the

RTC_GetTime(), RTC_GetDate() and

RTC_GetSubSecond() functions.

To add or subtract one hour to/from the RTC Calendar, use the

RTC_DayLightSavingConfig() function.

3.1.2

Alarm configuration

RTC Alarm

To configure the RTC alarm, use the

RTC_SetAlarm() function.

To enable the selected RTC alarm, use the

RTC_AlarmCmd() function.

To read the RTC alarm, use the

RTC_GetAlarm() function.

RTC Alarm Sub-second

To configure the RTC alarm sub-second, use the

RTC_AlarmSubSecondConfig() function.

To read the RTC alarm sub-second, use the

RTC_GetAlarmSubSecond() function.

3.1.3

RTC wakeup configuration

To configure the RTC Wakeup Clock source, use the

RTC_WakeUpClockConfig() function.

To configure the RTC WakeUp Counter, use the

RTC_SetWakeUpCounter() function.

To enable the RTC WakeUp, use the

RTC_WakeUpCmd() function.

To read the RTC WakeUp Counter register, use the

RTC_GetWakeUpCounter() function.

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