AN3371 datasheet(41/45 Pages) STMICROELECTRONICS

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AN3371

Application examples

Doc ID 018624 Rev 5

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Application examples

The RTC firmware driver is provided with a set of examples, so that you can quickly become

familiar with the RTC peripheral.

This section provides descriptions of examples that are delivered within the STM32F2xx,

STM32F4xx and STM32L1xx Standard Peripherals Libraries available from

http://www.st.com/.

For the STM32F2xx family, the examples can be found in the following directory:

STM32F2xx_StdPeriph_Lib_vX.Y.Z\Project\STM32F2xx_StdPeriph_Examples\RTC\

For the STM32L1xx family, the examples can be found in the following directory:

STM32L1xx_StdPeriph_Lib_vX.Y.Z\Project\STM32L1xx_StdPeriph_Examples\RTC\

For the STM32F4xx family, the examples can be found in the following directory:

STM32F4xx_StdPeriph_Lib_vX.Y.Z\Project\STM32F4xx_StdPeriph_Examples\RTC\

For the STM32F0xx family, the examples can be found in the following directory:

STM32F0xx_StdPeriph_Lib_vX.Y.Z\Project\STM32F0xx_StdPeriph_Examples\RTC\

For the STM32F3xx family, the examples can be found in the following directory:

STM323F3xx_StdPeriph_Lib_vX.Y.Z\Project\STM32F3xx_StdPeriph_Examples\RTC\

Table 17.

Example descriptions

Example

Description

Covered features

RTC Hardware

Calendar (1)

This example describes how to use the RTC peripheral calendar

features: seconds, minutes, hours (12 or 24 format), day, date, month,

and year.

As an application example, it demonstrates how to set up the RTC

peripheral, in terms of prescaler and interrupts to be used to keep time

and to generate an alarm interrupt.

– Hardware calendar

– Alarm (interrupt)

– Prescalers

– RTC backup registers

RTC Backup

domain (2)

This example demonstrates and explains how to use the peripherals

available on the Backup domain. These peripherals are the RCC

BDCR register containing the LSE oscillator configuration and the RTC

Clock enable/disable bits.

This example embeds the RTC peripheral and its associated Backup

Data registers, and the Backup SRAM (4KB) with its low power

regulator (which enables it to preserve its contents when the product is

As an application example, it demonstrates how to set up the RTC

hardware calendar, and read/write operations for RTC Backup Data

registers and BKPSRAM (Backup SRAM).

– RTC Backup registers

– Backup SRAM

– Low power regulator

for Backup SRAM

– Hardware calendar

– Wakeup (interrupt)

Auto calibration

using LSI

This example demonstrates and explains how to use the LSI clock

source auto calibration to get a precise RTC clock.

The Low Speed Internal (LSI) clock is used as the RTC clock source.

The RTC WakeUp is configured to generate an interrupt each 1s. The

WakeUp counter is clocked by the RTC CK_SPRE signal (1Hz) and its

counter is set to zero.

– Prescalers

– RTC backup registers

– Hardware calendar

– Wakeup (interrupt)

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