STM32F0xx Standard Peripherals Firmware Library: PWR STOP example

  ******************** (C) COPYRIGHT 2014 STMicroelectronics *******************
  * @file    PWR/PWR_STOP/readme.txt 
  * @author  MCD Application Team
  * @version V1.4.0
  * @date    24-July-2014
  * @brief   Description of the PWR STOP 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:
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  * 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
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  ******************************************************************************
   

PWR_Stop Example Description

This example shows how to enter the system to STOP mode and wake-up using EXTI Line interrupts. The EXTI Line sources are PC13 and RTC Alarm.

The EXTI line13 is configured to generate interrupt on falling edge. The EXTI line17(RTC Alarm) is configured to generate interrupt on rising edge.

The system enters and exits STOP mode as follow: After system start-up, the RTC is configured to generate an Alarm event then the system enters STOP mode. To wake-up from STOP mode you have to apply a falling edge on EXTI line13, otherwise the RTC Alarm will wake-up the system within 5 seconds. After exit from STOP, the system clock is reconfigured to its previous state (as HSE and PLL are disabled in STOP mode). Then, after a delay the system will enter again in STOP mode and exit in the way described above. This behavior is repeated in an infinite loop.

Three leds are used to monitor the system state as follow:

• LED1 ON: system in RUN mode
• LED1, LED2 and LED4 OFF: system in STOP mode
• LED2 ON if EXTI Line13 is used to exit from STOP
• LED4 ON if EXTI line17(RTC Alarm) is used to exit from STOP

  Note:

  To measure the current consumption in STOP mode, please refer to PWR Current Consumption example example.

  Directory contents

  • PWR/PWR_STOP/stm32f0xx_conf.h Library Configuration file
  • PWR/PWR_STOP/stm32f0xx_it.c Interrupt handlers
  • PWR/PWR_STOP/stm32f0xx_it.h Interrupt handlers header file
  • PWR/PWR_STOP/main.c Main program
  • PWR/PWR_STOP/main.h Header file for Main program
  • PWR/PWR_STOP/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 the Tamper push-button connected to PC13 pin

• STM32072B-EVAL Set-up
  • Use the Tamper push-button connected to PC13 pin

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
• 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
• Rebuild all files and load your image into target memory
• Run the example

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