ADC的认识
1 ADC初始化参数
/* 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 1 to 16. */
}ADC_InitTypeDef;涉及的相关参数：ADC分辨率（6/8/10/12位）、扫描或非扫描模式、连续或不连续转换、触发方式、对齐方式等。
这里值得注意的是规则组转化序列不能超过16。
2 ADC通用初始化参数
/**
* @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 2 sampling phases.
This parameter can be a value of
@ref ADC_delay_between_2_sampling_phases */
}ADC_CommonInitTypeDef;这里涉及相关ADC单独/多重模式选择，两采样阶段采样间隔，DMA使能/失能，ADC分屏系数（注意ADC的时钟频率不超过36Mhz）
3 ADC相关配置库函数
/* 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);