/** ****************************************************************************** * @file stm32f0xx_hal_adc_ex.c * @author MCD Application Team * @version V1.1.0 * @date 03-Oct-2014 * @brief This file provides firmware functions to manage the following * functionalities of the Analog to Digital Convertor (ADC) * peripheral: * + Operation functions * ++ Calibration (ADC automatic self-calibration) * @verbatim ============================================================================== ##### ADC specific features ##### ============================================================================== [..] (#) 12-bit, 10-bit, 8-bit or 6-bit configurable resolution (#) Interrupt generation at the end of regular conversion and in case of analog watchdog or overrun events. (#) Single and continuous conversion modes. (#) Scan mode for automatic conversion of channel 0 to channel 'n'. (#) Data alignment with in-built data coherency. (#) Programmable sampling time. (#) ADC conversion group Regular. (#) External trigger (timer or EXTI) with configurable polarity. (#) DMA request generation for transfer of conversions data of regular group. (#) ADC calibration (#) ADC supply requirements: 2.4 V to 3.6 V at full speed and down to 1.8 V at slower speed. (#) ADC input range: from Vref minud (connected to Vssa) to Vref plus(connected to Vdda or to an external voltage reference). ##### How to use this driver ##### ============================================================================== [..] (#) Enable the ADC interface As prerequisite, into HAL_ADC_MspInit(), ADC clock must be configured at RCC top level: clock source and clock prescaler. Two possible clock sources: synchronous clock derived from APB clock or asynchronous clock derived from ADC dedicated HSI RC oscillator 14MHz. Example: __ADC1_CLK_ENABLE(); (mandatory) HI14 enable or let under control of ADC: (optional) RCC_OscInitTypeDef RCC_OscInitStructure; RCC_OscInitStructure.OscillatorType = RCC_OSCILLATORTYPE_HSI14; RCC_OscInitStructure.HSI14CalibrationValue = RCC_HSI14CALIBRATION_DEFAULT; RCC_OscInitStructure.HSI14State = RCC_HSI14_ADC_CONTROL; RCC_OscInitStructure.PLL... (optional if used for system clock) HAL_RCC_OscConfig(&RCC_OscInitStructure); Parameter "HSI14State" must be set either: - to "...HSI14State = RCC_HSI14_ADC_CONTROL" to let the ADC control the HSI14 oscillator enable/disable (if not used to supply the main system clock): feature used if ADC mode LowPowerAutoPowerOff is enabled. - to "...HSI14State = RCC_HSI14_ON" to maintain the HSI14 oscillator always enabled: can be used to supply the main system clock. (#) ADC pins configuration (++) Enable the clock for the ADC GPIOs using the following function: __GPIOx_CLK_ENABLE(); (++) Configure these ADC pins in analog mode using HAL_GPIO_Init(); (#) Configure the ADC parameters (conversion resolution, data alignment, continuous mode, ...) using the HAL_ADC_Init() function. (#) Activate the ADC peripheral using one of the start functions: HAL_ADC_Start(), HAL_ADC_Start_IT(), HAL_ADC_Start_DMA(). *** Regular channels group configuration *** ============================================ [..] (+) To configure the ADC regular channels group features, use HAL_ADC_Init() and HAL_ADC_ConfigChannel() functions. (+) To activate the continuous mode, use the HAL_ADC_Init() function. (+) To read the ADC converted values, use the HAL_ADC_GetValue() function. *** DMA for Regular channels group features configuration *** ============================================================= [..] (+) To enable the DMA mode for regular channels group, use the HAL_ADC_Start_DMA() function. (+) To enable the generation of DMA requests continuously at the end of the last DMA transfer, use the HAL_ADC_Init() function. @endverbatim ****************************************************************************** * @attention * *

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* * 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. * ****************************************************************************** */ /* Includes ------------------------------------------------------------------*/ #include "stm32f0xx_hal.h" /** @addtogroup STM32F0xx_HAL_Driver * @{ */ /** @defgroup ADCEx ADCEx Extended HAL Module Driver * @brief ADC HAL module driver * @{ */ #ifdef HAL_ADC_MODULE_ENABLED /* Private typedef -----------------------------------------------------------*/ /* Private define ------------------------------------------------------------*/ /** @defgroup ADCEx_Private_Constants ADCEx Private Constants * @{ */ /* Fixed timeout values for ADC calibration, enable settling time, disable */ /* settling time. */ /* Values defined to be higher than worst cases: low clock frequency, */ /* maximum prescaler. */ /* Ex of profile low frequency : Clock source at 0.1 MHz, ADC clock */ /* prescaler 4. */ /* Unit: ms */ #define ADC_DISABLE_TIMEOUT 2 #define ADC_CALIBRATION_TIMEOUT 2 /** * @} */ /* Private macro -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ /* Private function prototypes -----------------------------------------------*/ /* Private functions ---------------------------------------------------------*/ /** @defgroup ADCEx_Exported_Functions ADCEx Exported Functions * @{ */ /** @defgroup ADCEx_Exported_Functions_Group1 Extended Initialization/de-initialization functions * @brief Extended Initialization and Configuration functions * @verbatim =============================================================================== ##### IO operation functions ##### =============================================================================== [..] This section provides functions allowing to: (+) Perform the ADC calibration. @endverbatim * @{ */ /** * @brief Perform an ADC automatic self-calibration * Calibration prerequisite: ADC must be disabled (execute this * function before HAL_ADC_Start() or after HAL_ADC_Stop() ). * @note Calibration factor can be read after calibration, using function * HAL_ADC_GetValue() (value on 7 bits: from DR[6;0]). * @param hadc: ADC handle * @retval HAL status */ HAL_StatusTypeDef HAL_ADCEx_Calibration_Start(ADC_HandleTypeDef* hadc) { HAL_StatusTypeDef tmpHALStatus = HAL_OK; uint32_t tickstart=0; /* Check the parameters */ assert_param(IS_ADC_ALL_INSTANCE(hadc->Instance)); /* Process locked */ __HAL_LOCK(hadc); /* Calibration prerequisite: ADC must be disabled. */ if (__HAL_ADC_IS_ENABLED(hadc) == RESET ) { /* Change ADC state */ hadc->State = HAL_ADC_STATE_READY; /* Start ADC calibration */ hadc->Instance->CR |= ADC_CR_ADCAL; tickstart = HAL_GetTick(); /* Wait for calibration completion */ while(HAL_IS_BIT_SET(hadc->Instance->CR, ADC_CR_ADCAL)) { if((HAL_GetTick() - tickstart) > ADC_CALIBRATION_TIMEOUT) { /* Update ADC state machine to error */ hadc->State = HAL_ADC_STATE_ERROR; /* Process unlocked */ __HAL_UNLOCK(hadc); return HAL_ERROR; } } } else { /* Update ADC state machine to error */ hadc->State = HAL_ADC_STATE_ERROR; } /* Process unlocked */ __HAL_UNLOCK(hadc); /* Return function status */ return tmpHALStatus; } /** * @} */ /** * @} */ #endif /* HAL_ADC_MODULE_ENABLED */ /** * @} */ /** * @} */ /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/