78 lines
3.0 KiB
Plaintext
78 lines
3.0 KiB
Plaintext
/**
|
|
@page COMP_Interrupt COMP Interrupt example
|
|
|
|
@verbatim
|
|
******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
|
|
* @file COMP/COMP_Interrupt/readme.txt
|
|
* @author MCD Application Team
|
|
* @brief Description of the COMP Interrupt example.
|
|
******************************************************************************
|
|
* @attention
|
|
*
|
|
* Copyright (c) 2016 STMicroelectronics.
|
|
* All rights reserved.
|
|
*
|
|
* This software is licensed under terms that can be found in the LICENSE file
|
|
* in the root directory of this software component.
|
|
* If no LICENSE file comes with this software, it is provided AS-IS.
|
|
*
|
|
******************************************************************************
|
|
@endverbatim
|
|
|
|
@par Example Description
|
|
|
|
How to use a comparator peripheral to compare a voltage level applied on a GPIO
|
|
pin to the the internal voltage reference (VREFINT), in interrupt mode.
|
|
|
|
When the comparator input crosses (either rising or falling edges) the internal reference
|
|
voltage VREFINT (1.22V), the comparator generates an interrupt.
|
|
|
|
In this example, the comparator is connected on pin PA1.
|
|
Each time comparator input crosses VREFINT, LED1 toggles.
|
|
|
|
If LED2 is powering on: This indicates that the system generates an
|
|
error.
|
|
|
|
@note Care must be taken when using HAL_Delay(), this function provides
|
|
accurate delay (in milliseconds) based on variable incremented in SysTick ISR.
|
|
This implies that if HAL_Delay() is called from a peripheral ISR process, then
|
|
the SysTick interrupt must have higher priority (numerically lower) than the
|
|
peripheral interrupt. Otherwise the caller ISR process will be blocked.
|
|
To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
|
|
|
|
@note The application need to ensure that the SysTick time base is always set
|
|
to 1 millisecond to have correct HAL operation.
|
|
|
|
@par Directory contents
|
|
|
|
- COMP/COMP_Interrupt/Inc/stm32f0xx_hal_conf.h HAL configuration file
|
|
- COMP/COMP_Interrupt/Inc/stm32f0xx_it.h Interrupt handlers header file
|
|
- COMP/COMP_Interrupt/Inc/main.h Header for main.c module
|
|
- COMP/COMP_Interrupt/Src/stm32f0xx_it.c Interrupt handlers
|
|
- COMP/COMP_Interrupt/Src/main.c Main program
|
|
- COMP/COMP_Interrupt/Src/stm32f0xx_hal_msp.c HAL MSP file
|
|
- COMP/COMP_Interrupt/Src/system_stm32f0xx.c STM32F0xx system source file
|
|
|
|
|
|
@par Hardware and Software environment
|
|
|
|
- This example runs on STM32F072VB devices.
|
|
|
|
- This example has been tested with STMicroelectronics STM32072B-EVAL RevB board and can be
|
|
easily tailored to any other supported device and development board.
|
|
|
|
- STM32072B-EVAL Set-up
|
|
|
|
- Use LED1 connected to PD.08 pin
|
|
- Apply an external variable voltage on PA1 with average voltage 1.22V.
|
|
|
|
@par How to use it ?
|
|
|
|
In order to make the program work, you must do the following :
|
|
- Open your preferred toolchain
|
|
- Rebuild all files and load your image into target memory
|
|
- Run the example
|
|
|
|
|
|
*/
|