STM32F103 - 初始化ADC1参数 - 03 - unfinished -unfinished-unfinished

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分类专栏： STM32_F103

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三、初始化ADC1参数，设置ADC1的工作模式以及规则序列的相关信息

ADC_InitTypeDef ADC_InitStructure;

ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;   //ADC工作模式:ADC1和ADC2工作在独立模式
ADC_InitStructure.ADC_ScanConvMode = DISABLE;   //模数转换工作在单通道模式
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;   //模数转换工作在单次转换模式
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;   //转换由软件而不是外部触发启动
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;   //ADC数据右对齐
ADC_InitStructure.ADC_NbrOfChannel = 1;   //顺序进行规则转换的ADC通道的数目

ADC_Init(ADC1, &ADC_InitStructure); //根据ADC_InitStruct中指定的参数初始化外设ADCx的寄存器

参数初始化

void ADC_Init(ADC_TypeDef* ADCx, ADC_InitTypeDef* ADC_InitStruct)
{
uint32_t tmpreg1 = 0;
uint8_t tmpreg2 = 0;

assert_param(IS_ADC_ALL_PERIPH(ADCx)); /* 检查参数 */
assert_param(IS_ADC_MODE(ADC_InitStruct->ADC_Mode));
assert_param(IS_FUNCTIONAL_STATE(ADC_InitStruct->ADC_ScanConvMode));
assert_param(IS_FUNCTIONAL_STATE(ADC_InitStruct->ADC_ContinuousConvMode));
assert_param(IS_ADC_EXT_TRIG(ADC_InitStruct->ADC_ExternalTrigConv));
assert_param(IS_ADC_DATA_ALIGN(ADC_InitStruct->ADC_DataAlign));
assert_param(IS_ADC_REGULAR_LENGTH(ADC_InitStruct->ADC_NbrOfChannel));

tmpreg1 = ADCx->CR1;
  tmpreg1 &= CR1_CLEAR_Mask;    //清除双重方式，清除扫描位
  tmpreg1 |= (uint32_t)(ADC_InitStruct->ADC_Mode | ((uint32_t)ADC_InitStruct->ADC_ScanConvMode << 8));
  ADCx->CR1 = tmpreg1;

  tmpreg1 = ADCx->CR2;
  tmpreg1 &= CR2_CLEAR_Mask;
  tmpreg1 |= (uint32_t)(ADC_InitStruct->ADC_DataAlign | ADC_InitStruct->ADC_ExternalTrigConv |
            ((uint32_t)ADC_InitStruct->ADC_ContinuousConvMode << 1));
  ADCx->CR2 = tmpreg1;

tmpreg1 = ADCx->SQR1;
tmpreg1 &= SQR1_CLEAR_Mask;
tmpreg2 |= (uint8_t) (ADC_InitStruct->ADC_NbrOfChannel - (uint8_t)1);
tmpreg1 |= (uint32_t)tmpreg2 << 20;
ADCx->SQR1 = tmpreg1;
}

结构体

typedef struct
{
  uint32_t ADC_Mode;                         / * !<将ADC配置为独立运行或双模式。*/
  FunctionalState ADC_ScanConvMode;    / * <转换是否在扫描(多通道)或单(单通道)模式。启用或禁用*/
  FunctionalState ADC_ContinuousConvMode;  / * <指定转换是否在连续、单一模式。启用或禁用。* /
  uint32_t ADC_ExternalTrigConv;         / * <启动模拟的外部触发器到数字转换的常规渠道。*/
  uint32_t ADC_DataAlign;               / * !<ADC数据是左对齐还是右对齐。 */
  uint8_t ADC_NbrOfChannel;      / * !<指定将使用序列器转换的adc通道数量。范围必须在1到16之间。*/
}ADC_InitTypeDef;

typedef enum {DISABLE = 0, ENABLE = !DISABLE} FunctionalState;

typedef struct
{
__IO uint32_t SR;
__IO uint32_t CR1;
__IO uint32_t CR2;
__IO uint32_t SMPR1;
__IO uint32_t SMPR2;
__IO uint32_t JOFR1;
__IO uint32_t JOFR2;
__IO uint32_t JOFR3;
__IO uint32_t JOFR4;
__IO uint32_t HTR;
__IO uint32_t LTR;
__IO uint32_t SQR1;
__IO uint32_t SQR2;
__IO uint32_t SQR3;
__IO uint32_t JSQR;
__IO uint32_t JDR1;
__IO uint32_t JDR2;
__IO uint32_t JDR3;
__IO uint32_t JDR4;
__IO uint32_t DR;
} ADC_TypeDef;