/**
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******************************************************************************
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* @file stm32f0xx_hal_adc_ex.c
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* @author MCD Application Team
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* @brief This file provides firmware functions to manage the following
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* functionalities of the Analog to Digital Convertor (ADC)
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* peripheral:
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* + Operation functions
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* ++ Calibration (ADC automatic self-calibration)
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* Other functions (generic functions) are available in file
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* "stm32f0xx_hal_adc.c".
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*
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@verbatim
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[..]
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(@) Sections "ADC peripheral features" and "How to use this driver" are
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available in file of generic functions "stm32l1xx_hal_adc.c".
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[..]
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@endverbatim
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******************************************************************************
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* @attention
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*
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* <h2><center>© COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
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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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*/
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/* Includes ------------------------------------------------------------------*/
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#include "stm32f0xx_hal.h"
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/** @addtogroup STM32F0xx_HAL_Driver
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* @{
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*/
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/** @defgroup ADCEx ADCEx
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* @brief ADC HAL module driver
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* @{
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*/
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#ifdef HAL_ADC_MODULE_ENABLED
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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/** @defgroup ADCEx_Private_Constants ADCEx Private Constants
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* @{
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*/
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/* Fixed timeout values for ADC calibration, enable settling time, disable */
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/* settling time. */
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/* Values defined to be higher than worst cases: low clock frequency, */
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/* maximum prescaler. */
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/* Ex of profile low frequency : Clock source at 0.1 MHz, ADC clock */
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/* prescaler 4. */
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/* Unit: ms */
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#define ADC_DISABLE_TIMEOUT 2
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#define ADC_CALIBRATION_TIMEOUT 2U
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/**
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* @}
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*/
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/* Private macros -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Private function prototypes -----------------------------------------------*/
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/* Private functions ---------------------------------------------------------*/
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/** @defgroup ADCEx_Exported_Functions ADCEx Exported Functions
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* @{
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*/
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/** @defgroup ADCEx_Exported_Functions_Group1 Extended Initialization/de-initialization functions
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* @brief Extended Initialization and Configuration functions
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*
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@verbatim
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===============================================================================
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##### IO operation functions #####
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===============================================================================
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[..] This section provides functions allowing to:
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(+) Perform the ADC calibration.
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@endverbatim
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* @{
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*/
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/**
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* @brief Perform an ADC automatic self-calibration
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* Calibration prerequisite: ADC must be disabled (execute this
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* function before HAL_ADC_Start() or after HAL_ADC_Stop() ).
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* @note Calibration factor can be read after calibration, using function
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* HAL_ADC_GetValue() (value on 7 bits: from DR[6;0]).
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* @param hadc ADC handle
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* @retval HAL status
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*/
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HAL_StatusTypeDef HAL_ADCEx_Calibration_Start(ADC_HandleTypeDef* hadc)
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{
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HAL_StatusTypeDef tmp_hal_status = HAL_OK;
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uint32_t tickstart = 0U;
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uint32_t backup_setting_adc_dma_transfer = 0; /* Note: Variable not declared as volatile because register read is already declared as volatile */
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/* Check the parameters */
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assert_param(IS_ADC_ALL_INSTANCE(hadc->Instance));
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/* Process locked */
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__HAL_LOCK(hadc);
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/* Calibration prerequisite: ADC must be disabled. */
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if (ADC_IS_ENABLE(hadc) == RESET)
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{
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/* Set ADC state */
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ADC_STATE_CLR_SET(hadc->State,
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HAL_ADC_STATE_REG_BUSY,
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HAL_ADC_STATE_BUSY_INTERNAL);
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/* Disable ADC DMA transfer request during calibration */
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/* Note: Specificity of this STM32 serie: Calibration factor is */
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/* available in data register and also transfered by DMA. */
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/* To not insert ADC calibration factor among ADC conversion data */
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/* in array variable, DMA transfer must be disabled during */
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/* calibration. */
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backup_setting_adc_dma_transfer = READ_BIT(hadc->Instance->CFGR1, ADC_CFGR1_DMAEN | ADC_CFGR1_DMACFG);
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CLEAR_BIT(hadc->Instance->CFGR1, ADC_CFGR1_DMAEN | ADC_CFGR1_DMACFG);
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/* Start ADC calibration */
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hadc->Instance->CR |= ADC_CR_ADCAL;
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tickstart = HAL_GetTick();
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/* Wait for calibration completion */
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while(HAL_IS_BIT_SET(hadc->Instance->CR, ADC_CR_ADCAL))
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{
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if((HAL_GetTick() - tickstart) > ADC_CALIBRATION_TIMEOUT)
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{
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/* Update ADC state machine to error */
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ADC_STATE_CLR_SET(hadc->State,
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HAL_ADC_STATE_BUSY_INTERNAL,
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HAL_ADC_STATE_ERROR_INTERNAL);
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/* Process unlocked */
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__HAL_UNLOCK(hadc);
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return HAL_ERROR;
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}
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}
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/* Restore ADC DMA transfer request after calibration */
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SET_BIT(hadc->Instance->CFGR1, backup_setting_adc_dma_transfer);
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/* Set ADC state */
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ADC_STATE_CLR_SET(hadc->State,
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HAL_ADC_STATE_BUSY_INTERNAL,
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HAL_ADC_STATE_READY);
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}
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else
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{
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/* Update ADC state machine to error */
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SET_BIT(hadc->State, HAL_ADC_STATE_ERROR_CONFIG);
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tmp_hal_status = HAL_ERROR;
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}
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/* Process unlocked */
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__HAL_UNLOCK(hadc);
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/* Return function status */
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return tmp_hal_status;
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}
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/**
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* @}
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*/
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/**
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* @}
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*/
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#endif /* HAL_ADC_MODULE_ENABLED */
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/**
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* @}
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*/
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/**
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* @}
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*/
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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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