tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32F0/stm32f0xx_hal_adc_ex.c

   1 /**
   2   ******************************************************************************
   3   * @file    stm32f0xx_hal_adc_ex.c
   4   * @author  MCD Application Team
   5   * @version V1.2.0
   6   * @date    11-December-2014
   7   * @brief   This file provides firmware functions to manage the following
   8   *          functionalities of the Analog to Digital Convertor (ADC)
   9   *          peripheral:
  10   *           + Operation functions
  11   *             ++ Calibration (ADC automatic self-calibration)
  12   *
  13   @verbatim
  14   ==============================================================================
  15                     ##### ADC specific features #####
  16   ==============================================================================
  17   [..]
  18   (#) 12-bit, 10-bit, 8-bit or 6-bit configurable resolution
  19
  20   (#) Interrupt generation at the end of regular conversion and in case of
  21       analog watchdog or overrun events.
  22
  23   (#) Single and continuous conversion modes.
  24
  25   (#) Scan mode for automatic conversion of channel 0 to channel 'n'.
  26
  27   (#) Data alignment with in-built data coherency.
  28
  29   (#) Programmable sampling time.
  30
  31   (#) ADC conversion group Regular.
  32
  33   (#) External trigger (timer or EXTI) with configurable polarity.
  34
  35   (#) DMA request generation for transfer of conversions data of regular group.
  36
  37   (#) ADC calibration
  38
  39   (#) ADC supply requirements: 2.4 V to 3.6 V at full speed and down to 1.8 V at
  40       slower speed.
  41
  42   (#) ADC input range: from Vref minud (connected to Vssa) to Vref plus(connected to
  43       Vdda or to an external voltage reference).
  44
  45
  46                      ##### How to use this driver #####
  47   ==============================================================================
  48     [..]
  49
  50     (#) Enable the ADC interface
  51         As prerequisite, into HAL_ADC_MspInit(), ADC clock must be configured
  52         at RCC top level: clock source and clock prescaler.
  53         Two possible clock sources: synchronous clock derived from APB clock
  54         or asynchronous clock derived from ADC dedicated HSI RC oscillator
  55         14MHz.
  56         Example:
  57           __ADC1_CLK_ENABLE();                         (mandatory)
  58
  59           HI14 enable or let under control of ADC:     (optional)
  60
  61           RCC_OscInitTypeDef   RCC_OscInitStructure;
  62           RCC_OscInitStructure.OscillatorType = RCC_OSCILLATORTYPE_HSI14;
  63           RCC_OscInitStructure.HSI14CalibrationValue = RCC_HSI14CALIBRATION_DEFAULT;
  64           RCC_OscInitStructure.HSI14State = RCC_HSI14_ADC_CONTROL;
  65           RCC_OscInitStructure.PLL...   (optional if used for system clock)
  66           HAL_RCC_OscConfig(&RCC_OscInitStructure);
  67
  68           Parameter "HSI14State" must be set either:
  69            - to "...HSI14State = RCC_HSI14_ADC_CONTROL" to let the ADC control
  70              the HSI14 oscillator enable/disable (if not used to supply the main
  71              system clock): feature used if ADC mode LowPowerAutoPowerOff is
  72              enabled.
  73            - to "...HSI14State = RCC_HSI14_ON" to maintain the HSI14 oscillator
  74              always enabled: can be used to supply the main system clock.
  75
  76     (#) ADC pins configuration
  77          (++) Enable the clock for the ADC GPIOs using the following function:
  78              __GPIOx_CLK_ENABLE();
  79          (++) Configure these ADC pins in analog mode using HAL_GPIO_Init();
  80
  81      (#) Configure the ADC parameters (conversion resolution, data alignment,
  82          continuous mode, ...) using the HAL_ADC_Init() function.
  83
  84      (#) Activate the ADC peripheral using one of the start functions:
  85          HAL_ADC_Start(), HAL_ADC_Start_IT(), HAL_ADC_Start_DMA().
  86
  87      *** Regular channels group configuration ***
  88      ============================================
  89      [..]
  90        (+) To configure the ADC regular channels group features, use
  91            HAL_ADC_Init() and HAL_ADC_ConfigChannel() functions.
  92        (+) To activate the continuous mode, use the HAL_ADC_Init() function.
  93        (+) To read the ADC converted values, use the HAL_ADC_GetValue() function.
  94
  95      *** DMA for Regular channels group features configuration ***
  96      =============================================================
  97      [..]
  98        (+) To enable the DMA mode for regular channels group, use the
  99            HAL_ADC_Start_DMA() function.
 100        (+) To enable the generation of DMA requests continuously at the end of
 101            the last DMA transfer, use the HAL_ADC_Init() function.
 102
 103     @endverbatim
 104   ******************************************************************************
 105   * @attention
 106   *
 107   * <h2><center>&copy; COPYRIGHT(c) 2014 STMicroelectronics</center></h2>
 108   *
 109   * Redistribution and use in source and binary forms, with or without modification,
 110   * are permitted provided that the following conditions are met:
 111   *   1. Redistributions of source code must retain the above copyright notice,
 112   *      this list of conditions and the following disclaimer.
 113   *   2. Redistributions in binary form must reproduce the above copyright notice,
 114   *      this list of conditions and the following disclaimer in the documentation
 115   *      and/or other materials provided with the distribution.
 116   *   3. Neither the name of STMicroelectronics nor the names of its contributors
 117   *      may be used to endorse or promote products derived from this software
 118   *      without specific prior written permission.
 119   *
 120   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 121   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 122   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 123   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 124   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 125   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 126   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 127   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 128   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 129   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 130   *
 131   ******************************************************************************
 132   */
 133
 134 /* Includes ------------------------------------------------------------------*/
 135 #include "stm32f0xx_hal.h"
 136
 137 /** @addtogroup STM32F0xx_HAL_Driver
 138   * @{
 139   */
 140
 141 /** @defgroup ADCEx ADCEx Extended HAL Module Driver
 142   * @brief ADC HAL module driver
 143   * @{
 144   */
 145
 146 #ifdef HAL_ADC_MODULE_ENABLED
 147
 148 /* Private typedef -----------------------------------------------------------*/
 149 /* Private define ------------------------------------------------------------*/
 150 /** @defgroup ADCEx_Private_Constants ADCEx Private Constants
 151   * @{
 152   */
 153
 154 /* Fixed timeout values for ADC calibration, enable settling time, disable  */
 155   /* settling time.                                                           */
 156   /* Values defined to be higher than worst cases: low clock frequency,       */
 157   /* maximum prescaler.                                                       */
 158   /* Ex of profile low frequency : Clock source at 0.1 MHz, ADC clock         */
 159   /* prescaler 4.                                                             */
 160   /* Unit: ms                                                                 */
 161   #define ADC_DISABLE_TIMEOUT           2
 162   #define ADC_CALIBRATION_TIMEOUT       2
 163 /**
 164   * @}
 165   */
 166
 167 /* Private macro -------------------------------------------------------------*/
 168 /* Private variables ---------------------------------------------------------*/
 169 /* Private function prototypes -----------------------------------------------*/
 170 /* Private functions ---------------------------------------------------------*/
 171
 172 /** @defgroup ADCEx_Exported_Functions ADCEx Exported Functions
 173   * @{
 174   */
 175
 176 /** @defgroup ADCEx_Exported_Functions_Group1 Extended Initialization/de-initialization functions
 177  *  @brief    Extended Initialization and Configuration functions
 178  *
 179 @verbatim
 180  ===============================================================================
 181                       ##### IO operation functions #####
 182  ===============================================================================
 183     [..]  This section provides functions allowing to:
 184       (+) Perform the ADC calibration.
 185 @endverbatim
 186   * @{
 187   */
 188
 189 /**
 190   * @brief  Perform an ADC automatic self-calibration
 191   *         Calibration prerequisite: ADC must be disabled (execute this
 192   *         function before HAL_ADC_Start() or after HAL_ADC_Stop() ).
 193   * @note   Calibration factor can be read after calibration, using function
 194   *         HAL_ADC_GetValue() (value on 7 bits: from DR[6;0]).
 195   * @param  hadc: ADC handle
 196   * @retval HAL status
 197   */
 198 HAL_StatusTypeDef HAL_ADCEx_Calibration_Start(ADC_HandleTypeDef* hadc)
 199 {
 200   HAL_StatusTypeDef tmpHALStatus = HAL_OK;
 201   uint32_t tickstart=0;
 202
 203   /* Check the parameters */
 204   assert_param(IS_ADC_ALL_INSTANCE(hadc->Instance));
 205
 206   /* Process locked */
 207   __HAL_LOCK(hadc);
 208
 209   /* Calibration prerequisite: ADC must be disabled.                          */
 210   if (__HAL_ADC_IS_ENABLED(hadc) == RESET )
 211   {
 212     /* Change ADC state */
 213     hadc->State = HAL_ADC_STATE_READY;
 214
 215     /* Start ADC calibration */
 216     hadc->Instance->CR |= ADC_CR_ADCAL;
 217
 218     tickstart = HAL_GetTick();
 219
 220     /* Wait for calibration completion */
 221     while(HAL_IS_BIT_SET(hadc->Instance->CR, ADC_CR_ADCAL))
 222     {
 223       if((HAL_GetTick() - tickstart) > ADC_CALIBRATION_TIMEOUT)
 224       {
 225         /* Update ADC state machine to error */
 226         hadc->State = HAL_ADC_STATE_ERROR;
 227
 228         /* Process unlocked */
 229         __HAL_UNLOCK(hadc);
 230
 231         return HAL_ERROR;
 232       }
 233     }
 234   }
 235   else
 236   {
 237     /* Update ADC state machine to error */
 238     hadc->State = HAL_ADC_STATE_ERROR;
 239   }
 240
 241   /* Process unlocked */
 242   __HAL_UNLOCK(hadc);
 243
 244   /* Return function status */
 245   return tmpHALStatus;
 246 }
 247
 248 /**
 249   * @}
 250   */
 251
 252 /**
 253   * @}
 254   */
 255
 256 #endif /* HAL_ADC_MODULE_ENABLED */
 257 /**
 258   * @}
 259   */
 260
 261 /**
 262   * @}
 263   */
 264
 265 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/