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98 lines
5.1 KiB
Plaintext
98 lines
5.1 KiB
Plaintext
/**
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@page SDADC_PressureMeasurement Pressure Measurement using SDADC
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@verbatim
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******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
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* @file SDADC/SDADC_PressureMeasurement/readme.txt
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* @author MCD Application Team
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* @brief Description of the SDADC Pressure Measurement 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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This example aims to show how to use the 16-bit resolution Sigma-Delta
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Analog-to-Digital converter to perform differential pressure measurement.
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This is done using the MPX2102A sensor mounted on the STM32373C-EVAL evaluation board.
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- The SDADC channel 8 is configured in differential mode.
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The external reference VREF (set to 3.3V on STM32373C-EVAL) is used as reference for SDADC.
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The conversion is triggered by TIM19. An interrupt is generated on each end of injected conversion.
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A MPX2102A sensor is connected to SDADC1 channel 8P (PE8) and channel 8N (PE9).
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The MPX2102 sensitivity when powered by 3.3V is 3.3V * 40mV / 10V = 13.2mV/1000mB
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= 13.2 microV/mB
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To increase the sensitivity an external 45.1 gain using the operation amplifier
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TVS632 mounted on STM32373C-EVAL is used. The same operation amplifier is
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used to shift up the input voltage by 3.3V/10.0f = 0.33V
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Refer to STM32373C-EVAL user manual for more details about how the MPX2102 is
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connected to PE8 and PE9
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- The measured pressure is displayed on the LCD mounted on STM32373C-EVAL.
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In order to get an accurate measurement of pressure a calibration phase
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should be added using a known pressure value.
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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 need 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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- SDADC/SDADC_PressureMeasurement/Inc/stm32f3xx_hal_conf.h HAL configuration file
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- SDADC/SDADC_PressureMeasurement/Inc/stm32f3xx_it.h Interrupt handlers header file
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- SDADC/SDADC_PressureMeasurement/Inc/main.h Header for main.c module
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- SDADC/SDADC_PressureMeasurement/Src/stm32f3xx_it.c Interrupt handlers
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- SDADC/SDADC_PressureMeasurement/Src/stm32f3xx_hal_msp.c.c HAL MSP module
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- SDADC/SDADC_PressureMeasurement/Src/main.c Main program
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- SDADC/SDADC_PressureMeasurement/Src/system_stm32f3xx.c STM32F3xx system source file
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@par Hardware and Software environment
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- This example runs on STM32F373xC devices.
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- This example has been tested with STMicroelectronics STM32373C-EVAL RevB
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boards and can be easily tailored to any other supported device
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and development board.
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- STM32373xC-EVAL Set-up
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- Make sure that jumper JP16 and JP17 are fitted.
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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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