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92 lines
4.4 KiB
Plaintext
92 lines
4.4 KiB
Plaintext
/**
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@page ADC_TriggerMode ADC1 conversion using Trigger Mode
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@verbatim
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******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
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* @file ADC/ADC_TriggerMode/readme.txt
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* @author MCD Application Team
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* @brief Description of the ADC Trigger Mode 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 ADC1 and TIM2 to continuously convert data from an ADC channel.
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Each time an external trigger is generated by TIM2 a new conversion is started
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by the ADC.
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Each time an external trigger is generated by TIM2 a new conversion is started by ADC1.
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At the end of conversion, an interrupt is generated and the converted data of
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ADC1 DR register is affected to the uhADCxConvertedValue variable in the ADC
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conversion complete call back function (HAL_ADC_ConvCpltCallback).
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The converted values can be monitored by adding "uhADCxConvertedValue" to the debugger.
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The timer is used to trigger an ADC measure at 20 KHz.
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Configuration of the timer to trig an ADC measure at 20 Khz:
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From the reference manual, Reset and Clock control part, Timer 2 is clocked on PCLK1.
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The function SystemClock_Config() configures the clock divider as follows:
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1) The system clock is 48 MHz.
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2) AHB Prescaler = 1 => AHB clock is 48 MHz.
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3) APB1 Prescaler = 1 => PCLK1 clock is 48 MHz.
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4) For Timer 2, as APB1 Prescaler = 1, Timer 2 Clock is PCLK1 clock X 1 = 48 MHz.
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For a 20 Khz frequency, we need 48 MHz / 20 KHz = 2400 clock cycle.
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So, in TIM_Config function, we set the following period: htim.Init.Period = 2400;
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The voltage on pin PC.00 (ADC_CHANNEL_10)can vary using the board potentiometer RV3.
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Remark: LED3 is ON when there is an error in initialization.
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@par Directory contents
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- ADC/ADC_TriggerMode/Inc/stm32f0xx_hal_conf.h HAL configuration file
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- ADC/ADC_TriggerMode/Inc/stm32f0xx_it.h DMA interrupt handlers header file
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- ADC/ADC_TriggerMode/Inc/main.h Header for main.c module
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- ADC/ADC_TriggerMode/Src/stm32f0xx_it.c DMA interrupt handlers
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- ADC/ADC_TriggerMode/Src/main.c Main program
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- ADC/ADC_TriggerMode/Src/stm32f0xx_hal_msp.c HAL MSP file
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- ADC/ADC_TriggerMode/Src/system_stm32f0xx.c STM32F0xx system source file
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@par Hardware and Software environment
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- This example runs on STM32F072VB devices.
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- This example has been tested with STMicroelectronics STM32072B-EVAL RevB 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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