RTC Timer example

  ******************** (C) COPYRIGHT 2014 STMicroelectronics *******************
  * @file    RTC/RTC_Timer/readme.txt 
  * @author  MCD Application Team
  * @version V1.4.0
  * @date    24-July-2014
  * @brief   Description of the RTC Timer example.
  ******************************************************************************
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  

Example Description

This example provides a short description of how to use the RTC peripheral�s with Alarm sub seconds feature to simulate a timer with refresh time equal to 250 ms (1 second/ 8) * 2). The RTC is configured to generate sub seconds interrupt each 125ms (will have 8 interrupt per 1 second).

For this example an interactive human interface is developed using STM320xx_EVAL�s LCD and Push Buttons to allow user to use Timer with a real progress bar display.

After startup, the timer is equal to 1 Minute (60 Seconds) and by pressing on the Tamper button the progress bar start to be filled for each 2 successive interrupts (after each 250ms). After 480 interrupts (60 * 8) the progress bar will be full.

User can manipulate the chronometer features using the Tamper and Wakeup buttons:

• press Sel button to Start the timer.
• press Tamper button to stop the timer.

Directory contents

• RTC/RTC_Timer/system_stm32f0xx.c STM32F0xx system clock configuration file
• RTC/RTC_Timer/stm32f0xx_conf.h Library Configuration file
• RTC/RTC_Timer/stm32f0xx_it.c Interrupt handlers
• RTC/RTC_Timer/stm32f0xx_it.h Header for stm32f0xx_it.c
• RTC/RTC_Timer/main.c Main program
• RTC/RTC_Timer/main.h Main header file

Note:

The "system_stm32f0xx.c" is generated by an automatic clock configuration tool and can be easily customized to your own configuration. To select different clock setup, use the "STM32F0xx_Clock_Configuration_V1.0.0.xls" provided with the AN3988 package available on ST Microcontrollers

Hardware and Software environment

• This example runs on STM32F0xx Devices.

• This example has been tested with STMicroelectronics STM320518-EVAL and STM32072B-EVAL including respectively STM32F051R8T6 and STM32F072VBT6 devices and can be easily tailored to any other supported device and development board.

• STM320518-EVAL Set-up
  • Use SEL push button.
  • Use the TAMPER push button connected to PC.13 pin (EXTI Line13).

• STM32072B-EVAL Set-up
  • Use SEL push button.
  • Use the TAMPER push button connected to PC.13 pin (EXTI Line13).

How to use it ?

In order to make the program work, you must do the following :

• Copy all source files from this example folder to the template folder under Project
• Open your preferred toolchain
• If the used device is STM32F051R8T6 choose STM32F051 project
  • Add the following files to the project source list
    • Utilities\STM32_EVAL\STM320518_EVAL\stm320518_eval.c
    • Utilities\STM32_EVAL\STM320518_EVAL\stm320518_eval_lcd.c

• If the used device is STM32F072VBT6 choose STM32F072 project
  • Add the following files to the project source list
    • Utilities\STM32_EVAL\STM32072B_EVAL\stm32072b_eval.c
    • Utilities\STM32_EVAL\STM32072B_EVAL\stm32072b_eval_lcd.c
• Rebuild all files and load your image into target memory
• Run the example

© COPYRIGHT STMicroelectronics