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95 lines
4.7 KiB
Plaintext
95 lines
4.7 KiB
Plaintext
/**
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@page ADC_RegularConversion_Interrupt conversion using interrupt
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@verbatim
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******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
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* @file ADC/ADC_RegularConversion_Interrupt/readme.txt
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* @author MCD Application Team
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* @brief Description of the ADC RegularConversion interrupt example.
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******************************************************************************
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************
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@endverbatim
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@par Example Description
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How to use the ADC in interrupt mode to convert data through the HAL API.
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The ADC1 is configured to continuously convert ADC_CHANNEL_1.
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Each time an end of conversion occurs an interrupt is generated and the converted
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data of ADC1 DR register is affected to the uhADCxConvertedValue variable in the
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ADC conversion complete call back function.
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In this example, the system clock is 100MHz, APB2 = 100MHz and ADC clock = APB2/4.
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Since ADC1 clock is 25 MHz and sampling time is set to 3 cycles, the conversion
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time to 12bit data is 12 cycles so the total conversion time is (12+3)/25= 0.6us(1.7Msps).
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User can vary the ADC_CHANNEL_1 voltage by applying an input voltage on pin PA1 (A1 connector CN9)
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(e.g. using function generator).
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The converted value can be monitored through the debugger using the uhADCxConvertedValue variable.
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STM32 board LED can be used to monitor the conversion:
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- LED4 is ON if an error occurs.
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@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
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based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
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a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
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than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
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To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
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@note The application needs to ensure that the SysTick time base is always set to 1 millisecond
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to have correct HAL operation.
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@par Directory contents
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- ADC/ADC_RegularConversion_Interrupt/Inc/stm32f4xx_hal_conf.h HAL configuration file
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- ADC/ADC_RegularConversion_Interrupt/Inc/stm32f4xx_it.h DMA interrupt handlers header file
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- ADC/ADC_RegularConversion_Interrupt/Inc/main.h Header for main.c module
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- ADC/ADC_RegularConversion_Interrupt/Src/stm32f4xx_it.c DMA interrupt handlers
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- ADC/ADC_RegularConversion_Interrupt/Src/main.c Main program
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- ADC/ADC_RegularConversion_Interrupt/Src/stm32f4xx_hal_msp.c HAL MSP file
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- ADC/ADC_RegularConversion_Interrupt/Src/system_stm32f4xx.c STM32F4xx system source file
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@par Hardware and Software environment
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- This example runs on STM32F413xx devices.
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- This example has been tested with STM32F413H-DISCOVERY board and can be
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easily tailored to any other supported device and development board.
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@par How to use it ?
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In order to make the program work, you must do the following :
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- Open your preferred toolchain
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- Rebuild all files and load your image into target memory
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- Run the example
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* <h3><center>© COPYRIGHT STMicroelectronics</center></h3>
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*/
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