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Example

STM32F4 Internal RTC and Calender

Rating:

10

Author: Andrew Hazelton

Last Updated: 2017-10-12

Package Version: 1.2.0.0

Example: 1.0.0.0

Category: Timers (Real time clock)

Downloaded: 2605 times

Followed by: 2 users

License: MIT license  

This is an example of how to use the STM32F407VG internal Real Time Clock (RTC) and Calender module with external LSE oscillator to be 32.768 kHz.

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DOWNLOAD LINK RELATED COMPILER CONTAINS
mikroC PRO for ARM
  • lib
  • src
  • exa
  • hlp
  • hex
  • sch
  • pcb
  • doc

Example Blog

STM32F4 Internal RTC &amp; Calender Module Diagram

STM32F4 Internal RTC & Calender Module Diagram

STM32F4 Internal RTC & Calender Module Diagram

View full image
STM32F4 System Clocks

STM32F4 System Clocks

This is a screen capture from the STM32CubeMX software provided free from st.com that visually shown the internal system clock lines an Prescaler values. It makes it much easier to understand than trying to piece it all together from the datasheet.

View full image

This is an example of how to use the STM32F407VG internal Real Time Clock (RTC) and Calender module with external LSE oscillator to be 32.768 kHz.

The mE USART Terminal is used to print out the RTC and Calender values and status messages. Turn on USB UART B.  Turn ON   SW12.3   SW12.4  (Board: EasyMx PRO v7 for STM32 ARM).

Connecting a USB cable between your PC and USB UART B on board will create a virtual COM port on your PC which can then be accessed via the mE USART Terminal within your mE compiler.

Use the “Computer_Brd_Chip_168MHz.cfgsch” file in the attached for internal MCU configuration. The image above is a visual depiction of this configuration file setup. This setup will insure that the STM32F407VG is running at its maximum speed.

For full details on STM32F4 internal modules see RM0090 ST Reference Manual from st.com.

RTC_Init ( … )

RTC_SetTime ( … )

RTC_SetDate ( … )

RTC_GetSubSeconds ( … )

RTC_GetTime ( … )

RTC_GetDate ( … ) // Printing values across to the mE USART Terminal

RTC_PrintTime ( … )

RTC_PrintDate ( … )

Print_Sub_Secs ( … )  

***************************************************************************************** 

Version 1.2.0.0  - 10th Aug 2015

Added Calibrate_RTC_Crystal function.

Changed RTC_SetTime function.

Changed RTC_Init function.

Made minor improvements. 

 

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