STM32F0xx Standard Peripherals Firmware Library: RTC StopWatch example

  ******************** (C) COPYRIGHT 2014 STMicroelectronics *******************
  * @file    RTC/RTC_StopWatch/readme.txt 
  * @author  MCD Application Team
  * @version V1.4.0
  * @date    24-July-2014
  * @brief   Description of the RTC StopWatch 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 illustrates how to use the STM32F0xx new RTC's sub-seconds and Tamper feature (Filter, sampling) features. It simulates a precise chronometer with 2 record times possibilities stored in the Backup registers (2 registers for time (second, minutes and hours) and 2 registers for subsecond).

For this example an interactive human interface is developed using LCD and Push Buttons to allow user to use StopWatch with real time display.

After startup, a default 00:00:00:000 chronometer counter is displayed on the LCD, it corresponds to [Hours]:[minutes]:[seconds]:[milliseconds]. User can manipulate the chronometer features using Joystick LEFT, RIGHT and Tamper buttons:

• press Joystick LEFT button to start counter.
• press Joystick RIGHT button to save trials in the backup registers (max 5 actions).
• press and hold Tamper button for 1 sec to reset all the backup registers.

Directory contents

• RTC/RTC_StopWatch/stm32f0xx_conf.h Library Configuration file
• RTC/RTC_StopWatch/stm32f0xx_it.c Interrupt handlers
• RTC/RTC_StopWatch/stm32f0xx_it.h Interrupt handlers header file
• RTC/RTC_StopWatch/main.c Main program
• RTC/RTC_StopWatch/main.h Main program header file
• RTC/RTC_StopWatch/system_stm32f0xx.c STM32F0xx system source file

Note:

The "system_stm32f0xx.c" is generated by an automatic clock configuration tool and can be easily customized to meet user application requirements. To select different clock setup, use the "STM32F0xx_Clock_Configuration_VX.Y.Z.xls" provided with the AN4055 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 Joystick LEFT and RIGHT button
  • Use Tamper button

• STM32072B-EVAL Set-up
  • Use Joystick LEFT and RIGHT button
  • Use Tamper button

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/STM320518_EVAL/stm32072b_eval_lcd.c
• Rebuild all files and load your image into target memory
• Run the example

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