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/**
******************************************************************************
* @file stm32f0xx_hal_adc_ex.c
* @author MCD Application Team
* @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)
* Other functions (generic functions) are available in file
* "stm32f0xx_hal_adc.c".
*
@verbatim
[..]
(@) Sections "ADC peripheral features" and "How to use this driver" are
available in file of generic functions "stm32l1xx_hal_adc.c".
[..]
@endverbatim
******************************************************************************
* @attention
*
* <h2><center>© Copyright (c) 2016 STMicroelectronics.
* All rights reserved.</center></h2>
*
* This software component is licensed by ST under BSD 3-Clause license,
* the "License"; You may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
* opensource.org/licenses/BSD-3-Clause
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32f0xx_hal.h"
/** @addtogroup STM32F0xx_HAL_Driver
* @{
*/
/** @defgroup ADCEx ADCEx
* @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 2U
/**
* @}
*/
/* Private macros -------------------------------------------------------------*/
/* 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 tmp_hal_status = HAL_OK;
uint32_t tickstart = 0U;
uint32_t backup_setting_adc_dma_transfer = 0; /* Note: Variable not declared as volatile because register read is already declared as volatile */
/* Check the parameters */
assert_param(IS_ADC_ALL_INSTANCE(hadc->Instance));
/* Process locked */
__HAL_LOCK(hadc);
/* Calibration prerequisite: ADC must be disabled. */
if (ADC_IS_ENABLE(hadc) == RESET)
{
/* Set ADC state */
ADC_STATE_CLR_SET(hadc->State,
HAL_ADC_STATE_REG_BUSY,
HAL_ADC_STATE_BUSY_INTERNAL);
/* Disable ADC DMA transfer request during calibration */
/* Note: Specificity of this STM32 serie: Calibration factor is */
/* available in data register and also transfered by DMA. */
/* To not insert ADC calibration factor among ADC conversion data */
/* in array variable, DMA transfer must be disabled during */
/* calibration. */
backup_setting_adc_dma_transfer = READ_BIT(hadc->Instance->CFGR1, ADC_CFGR1_DMAEN | ADC_CFGR1_DMACFG);
CLEAR_BIT(hadc->Instance->CFGR1, ADC_CFGR1_DMAEN | ADC_CFGR1_DMACFG);
/* 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 */
ADC_STATE_CLR_SET(hadc->State,
HAL_ADC_STATE_BUSY_INTERNAL,
HAL_ADC_STATE_ERROR_INTERNAL);
/* Process unlocked */
__HAL_UNLOCK(hadc);
return HAL_ERROR;
}
}
/* Restore ADC DMA transfer request after calibration */
SET_BIT(hadc->Instance->CFGR1, backup_setting_adc_dma_transfer);
/* Set ADC state */
ADC_STATE_CLR_SET(hadc->State,
HAL_ADC_STATE_BUSY_INTERNAL,
HAL_ADC_STATE_READY);
}
else
{
/* Update ADC state machine to error */
SET_BIT(hadc->State, HAL_ADC_STATE_ERROR_CONFIG);
tmp_hal_status = HAL_ERROR;
}
/* Process unlocked */
__HAL_UNLOCK(hadc);
/* Return function status */
return tmp_hal_status;
}
/**
* @}
*/
/**
* @}
*/
#endif /* HAL_ADC_MODULE_ENABLED */
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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