STM32F4開發闆----ADC（005）

ADC的認識

1 ADC初始化參數

/* Exported types ------------------------------------------------------------*/

/**
  * @brief   ADC Init structure definition  
  */
typedef struct
{
  uint32_t ADC_Resolution;                                 /*!< Configures the ADC resolution dual mode. This parameter can be a value of @ref ADC_resolution */                                   
  FunctionalState ADC_ScanConvMode;             /*!< Specifies whether the conversion is performed in Scan (multichannels)or Single (one channel) mode.
                                                                                   This parameter can be set to ENABLE or DISABLE */
  FunctionalState ADC_ContinuousConvMode;  /*!< Specifies whether the conversion is performed in Continuous or Single mode.
                                                                                   This parameter can be set to ENABLE or DISABLE. */
  uint32_t ADC_ExternalTrigConvEdge;          /*!< Select the external trigger edge and enable the trigger of a regular group.
                                                                           This parameter can be a value of
                                                                       @ref ADC_external_trigger_edge_for_regular_channels_conversion */
  uint32_t ADC_ExternalTrigConv;                  /*!< Select the external event used to trigger the start of conversion of a regular group.
                                                                           This parameter can be a value of
                                                                       @ref ADC_extrenal_trigger_sources_for_regular_channels_conversion */
  uint32_t ADC_DataAlign;                 /*!< Specifies whether the ADC data  alignment is left or right. This parameter can be
                                                                       a value of @ref ADC_data_align */
  uint8_t  ADC_NbrOfConversion;           /*!< Specifies the number of ADC conversions  that will be done using the sequencer for
                                                                       regular channel group.This parameter must range from  to  */
}ADC_InitTypeDef;
           

涉及的相關參數：ADC分辨率（6/8/10/12位）、掃描或非掃描模式、連續或不連續轉換、觸發方式、對齊方式等。

這裡值得注意的是規則組轉化序列不能超過16。

2 ADC通用初始化參數

/**
  * @brief   ADC Common Init structure definition  
  */
typedef struct
{
  uint32_t ADC_Mode;                      /*!< Configures the ADC to operate in
                                               independent or multi mode.
                                               This parameter can be a value of @ref ADC_Common_mode */                                              
  uint32_t ADC_Prescaler;                 /*!< Select the frequency of the clock
                                               to the ADC. The clock is common for all the ADCs.
                                               This parameter can be a value of @ref ADC_Prescaler */
  uint32_t ADC_DMAAccessMode;             /*!< Configures the Direct memory access
                                              mode for multi ADC mode.
                                               This parameter can be a value of
                                               @ref ADC_Direct_memory_access_mode_for_multi_mode */
  uint32_t ADC_TwoSamplingDelay;          /*!< Configures the Delay between  sampling phases.
                                               This parameter can be a value of
                                               @ref ADC_delay_between_2_sampling_phases */

}ADC_CommonInitTypeDef;
           

這裡涉及相關ADC單獨/多重模式選擇，兩采樣階段采樣間隔，DMA使能/失能，ADC分屏系數（注意ADC的時鐘頻率不超過36Mhz）

3 ADC相關配置庫函數

/*  Function used to set the ADC configuration to the default reset state *****/  
void ADC_DeInit(void);

/* Initialization and Configuration functions *********************************/
void ADC_Init(ADC_TypeDef* ADCx, ADC_InitTypeDef* ADC_InitStruct);
void ADC_StructInit(ADC_InitTypeDef* ADC_InitStruct);
void ADC_CommonInit(ADC_CommonInitTypeDef* ADC_CommonInitStruct);
void ADC_CommonStructInit(ADC_CommonInitTypeDef* ADC_CommonInitStruct);
void ADC_Cmd(ADC_TypeDef* ADCx, FunctionalState NewState);

/* Analog Watchdog configuration functions ************************************/
void ADC_AnalogWatchdogCmd(ADC_TypeDef* ADCx, uint32_t ADC_AnalogWatchdog);
void ADC_AnalogWatchdogThresholdsConfig(ADC_TypeDef* ADCx, uint16_t HighThreshold,uint16_t LowThreshold);
void ADC_AnalogWatchdogSingleChannelConfig(ADC_TypeDef* ADCx, uint8_t ADC_Channel);

/* Temperature Sensor, Vrefint and VBAT management functions ******************/
void ADC_TempSensorVrefintCmd(FunctionalState NewState);
void ADC_VBATCmd(FunctionalState NewState);

/* Regular Channels Configuration functions ***********************************/
void ADC_RegularChannelConfig(ADC_TypeDef* ADCx, uint8_t ADC_Channel, uint8_t Rank, uint8_t ADC_SampleTime);
void ADC_SoftwareStartConv(ADC_TypeDef* ADCx);
FlagStatus ADC_GetSoftwareStartConvStatus(ADC_TypeDef* ADCx);
void ADC_EOCOnEachRegularChannelCmd(ADC_TypeDef* ADCx, FunctionalState NewState);
void ADC_ContinuousModeCmd(ADC_TypeDef* ADCx, FunctionalState NewState);
void ADC_DiscModeChannelCountConfig(ADC_TypeDef* ADCx, uint8_t Number);
void ADC_DiscModeCmd(ADC_TypeDef* ADCx, FunctionalState NewState);
uint16_t ADC_GetConversionValue(ADC_TypeDef* ADCx);
uint32_t ADC_GetMultiModeConversionValue(void);

/* Regular Channels DMA Configuration functions *******************************/
void ADC_DMACmd(ADC_TypeDef* ADCx, FunctionalState NewState);
void ADC_DMARequestAfterLastTransferCmd(ADC_TypeDef* ADCx, FunctionalState NewState);
void ADC_MultiModeDMARequestAfterLastTransferCmd(FunctionalState NewState);

/* Injected channels Configuration functions **********************************/
void ADC_InjectedChannelConfig(ADC_TypeDef* ADCx, uint8_t ADC_Channel, uint8_t Rank, uint8_t ADC_SampleTime);
void ADC_InjectedSequencerLengthConfig(ADC_TypeDef* ADCx, uint8_t Length);
void ADC_SetInjectedOffset(ADC_TypeDef* ADCx, uint8_t ADC_InjectedChannel, uint16_t Offset);
void ADC_ExternalTrigInjectedConvConfig(ADC_TypeDef* ADCx, uint32_t ADC_ExternalTrigInjecConv);
void ADC_ExternalTrigInjectedConvEdgeConfig(ADC_TypeDef* ADCx, uint32_t ADC_ExternalTrigInjecConvEdge);
void ADC_SoftwareStartInjectedConv(ADC_TypeDef* ADCx);
FlagStatus ADC_GetSoftwareStartInjectedConvCmdStatus(ADC_TypeDef* ADCx);
void ADC_AutoInjectedConvCmd(ADC_TypeDef* ADCx, FunctionalState NewState);
void ADC_InjectedDiscModeCmd(ADC_TypeDef* ADCx, FunctionalState NewState);
uint16_t ADC_GetInjectedConversionValue(ADC_TypeDef* ADCx, uint8_t ADC_InjectedChannel);

/* Interrupts and flags management functions **********************************/
void ADC_ITConfig(ADC_TypeDef* ADCx, uint16_t ADC_IT, FunctionalState NewState);
FlagStatus ADC_GetFlagStatus(ADC_TypeDef* ADCx, uint8_t ADC_FLAG);
void ADC_ClearFlag(ADC_TypeDef* ADCx, uint8_t ADC_FLAG);
ITStatus ADC_GetITStatus(ADC_TypeDef* ADCx, uint16_t ADC_IT);
void ADC_ClearITPendingBit(ADC_TypeDef* ADCx, uint16_t ADC_IT);