STM32F0xx Standard Peripherals Firmware Library: COMP Analog Watchdog example

  ******************** (C) COPYRIGHT 2014 STMicroelectronics *******************
  * @file    COMP/COMP_AnalogWatchdog/readme.txt  
  * @author  MCD Application Team
  * @version V1.4.0
  * @date    24-July-2014
  * @brief   Description of the COMP Analog Watchdog 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 shows how to make an analog watchdog using the STM32F0xx COMPs peripherals in window mode:

• The upper threshold is set to VREFINT = 1.22V
• The lower threshold is set to VREFINT / 4 = 1.22/4 = 0.305V
• The input voltage is configured to be connected to PA.01 (On STM320518-EVAL RV3 (PC.01) is used to simulate an input voltage)
• The input voltage is configured to be connected to PA.01 (On STM32072B-EVAL RV3 (PC.00) is used to simulate an input voltage)

If the input voltage is above the higher threshold, LD3 and LD1 are turned On. If the input voltage is under the lower threshold, LD2 and LD4 are turned On. If the input voltage is within the thresholds, the MCU remains in STOP mode

Directory contents

• COMP/COMP_AnalogWatchdog/stm32f0xx_conf.h Library Configuration file
• COMP/COMP_AnalogWatchdog/stm32f0xx_it.c Interrupt handlers
• COMP/COMP_AnalogWatchdog/stm32f0xx_it.h Interrupt handlers header file
• COMP/COMP_AnalogWatchdog/main.c Main program
• COMP/COMP_AnalogWatchdog/main.h Main Header file
• COMP/COMP_AnalogWatchdog/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 LED1, LED2, LED3 and LED4 connected respectively to PC.10, PC.11 ,PC.12 and PD.02 pins

    Note:

    This example run in stand alone mode.

  • Use a wire to connect Potentiometer RV3 (PC.01 pin) to COMP2 non inverting input (PA.01)

• STM32072B-EVAL Set-up
  • Use LED1, LED2, LED3 and LED4 connected respectively to PD.08, PD.09 ,PD.10 and PD.11 pins

    Note:

    This example run in stand alone mode.

  • Use a wire to connect Potentiometer RV3 (PC.00 pin) to COMP2 non inverting input (PA.01)

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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