ADC.zip_HAL_LIB

/** @page ADC_LowPower ADC conversion example using related peripherals (GPIO, Timer), user control by push button and LED. @verbatim ******************** (C) COPYRIGHT 2016 STMicroelectronics ******************* * @file ADC/ADC_LowPower/readme.txt * @author MCD Application Team * @version V1.8.0 * @date 21-April-2017 * @brief brief Description of the ADC Low Power modes example. ****************************************************************************** * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * 3. Neither the name of STMicroelectronics nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************** @endverbatim @par Example Description This example provides a short description of how to use the ADC peripheral to perform conversions with ADC low power modes: auto-wait. Other peripherals related to ADC are used: Mandatory: - GPIO peripheral is used in analog mode to drive signal from device pin to ADC input. Optionally: - Timer peripheral is used to trig ADC conversions. ADC settings: - Trig of conversion start done by external event (timer at 1kHz). - Continuous mode disabled to have only 1 conversion at each conversion trig. ADC conversion results: - ADC conversions results are transferred manually (by software), into variable array "uhADCxConvertedValue". Board settings: - ADC is configured to convert ADC_CHANNEL_9 (pin PA.04 (Arduino A2)). - Use an external power supply, adjust supply voltage and connect it to pin PA.04 (Arduino A2). How to use this example: ADC overrun feature is used to watch the ADC low power modes effectiveness: - If definition label "#define ADC_LOWPOWER" is commented, then ADC does not use low power features. Trigger events are occurring continuously (from timer trigger out), ADC performs a conversion at each trigger event. ADC conversion results are not fetch after each conversion, therefore some results are overwritten and ADC overrun triggers. => Press User push-button (fetch an ADC conversion result and refresh LED state), then LED2 should turn on. - If definition label "#define ADC_LOWPOWER" is uncommented, then ADC does use low power features. Trigger events are occurring continuously (from timer trigger out), but ADC does not perform a conversion at each trigger event: after the first ADC conversion, ADC does not start a new conversion until the previous conversion result has been fetched (done by function "HAL_ADC_GetValue(&AdcHandle)" into the example: this is ADC feature "LowPowerAutoWait". When user press User push-button, ADC result is fetched and ADC is freed from idle phase: a new conversion starts at the next trigger event. ADC conversion results are never overwritten, ADC overrun does not trigger => Press User push-button (fetch an ADC conversion result and refresh LED state), then LED2 should remain turned off. @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 needs to ensure that the SysTick time base is always set to 1 millisecond to have correct HAL operation. @par Directory contents - ADC/ADC_LowPower/Inc/stm32l4xx_hal_conf.h HAL configuration file - ADC/ADC_LowPower/Inc/stm32l4xx_it.h HAL interrupt handlers header file - ADC/ADC_LowPower/Inc/main.h Header for main.c module - ADC/ADC_LowPower/Src/stm32l4xx_it.c HAL interrupt handlers - ADC/ADC_LowPower/Src/main.c Main program - ADC/ADC_LowPower/Src/stm32l4xx_hal_msp.c HAL MSP file - ADC/ADC_LowPower/Src/system_stm32l4xx.c STM32L4xx system source file @par Hardware and Software environment - This example runs on STM32L452xx devices. - This example has been tested with STM32L452RE-Nucleo Rev C board and can be easily tailored to any other supported device and development board. @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 * <h3><center>&copy; COPYRIGHT STMicroelectronics</center></h3> */