代码收藏家技术教程 2023-08-15

STM32 ADC采集中使用DMA和中断处理的实现方法

//============================================
//函数名称:ADC1_Mode_Config(void)
//功能描述:配置ADC1的工作模式为MDA模式
//输入:无
//输出:无
//============================================
void ADC1_Mode_Config(void)
{
      DMA_InitTypeDef DMA_InitStructure;
      ADC_InitTypeDef ADC_InitStructure;

      /* DMA channel1 configuration */
      DMA_DeInit(DMA1_Channel1);

      DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;                   //ADC地址
      DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&ADC_ConvertedValue;       //内存地址  ADC_ConvertedValue[15]一个数组
      DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
      DMA_InitStructure.DMA_BufferSize = 15;
      DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;                //外设地址固定
      DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;                               //内存地址自加
      DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;       //半字
      DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
      DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;                                                 //循环传输
      DMA_InitStructure.DMA_Priority = DMA_Priority_High;
      DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
      DMA_Init(DMA1_Channel1, &DMA_InitStructure);

      /* Enable DMA channel1 */
      DMA_Cmd(DMA1_Channel1, ENABLE);

      DMA_ITConfig(DMA1_Channel1,DMA_IT_TC,ENABLE); //传输结束中断

      /* ADC1 configuration */
      ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;                      //独立ADC模式
      ADC_InitStructure.ADC_ScanConvMode = DISABLE ;                               //禁止扫描模式，扫描模式用于多通道采集
      ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;                      //开启连续转换模式，即不停地进行ADC转换
      ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;       //不使用外部触发转换
      ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;       //采集数据右对齐
      ADC_InitStructure.ADC_NbrOfChannel = 1;                               //要转换的通道数目1
      ADC_Init(ADC1, &ADC_InitStructure);

      /*配置ADC时钟，为PCLK2的8分频，即9MHz*/
      RCC_ADCCLKConfig(RCC_PCLK2_Div8);
      /*配置ADC1的通道11为55.       5个采样周期，序列为1 */
      ADC_RegularChannelConfig(ADC1, ADC_Channel_8, 1, ADC_SampleTime_55Cycles5);

      /* Enable ADC1 DMA */
      ADC_DMACmd(ADC1, ENABLE);

      /* Enable ADC1 */
      ADC_Cmd(ADC1, ENABLE);

      /*复位校准寄存器 */
      ADC_ResetCalibration(ADC1);
      /*等待校准寄存器复位完成 */
      while(ADC_GetResetCalibrationStatus(ADC1));

      /* ADC校准 */
      ADC_StartCalibration(ADC1);
      /* 等待校准完成*/
      while(ADC_GetCalibrationStatus(ADC1));

      /* 由于没有采用外部触发，所以使用软件触发ADC转换 */
      ADC_SoftwareStartConvCmd(ADC1, ENABLE);
}

//============================================
//函数名称:DMA1_Channel1_IRQHandler
//功能描述:DMA中断对AD采集值平均滤波
//输入:无
//输出:无
//============================================
void DMA1_Channel1_IRQHandler(void)
{
      BYTE i;
      WORD ADC_ConvertedValue_TEMP=0;

      for(i=0;i<15;i++)
      {
            ADC_ConvertedValue_TEMP += ADC_ConvertedValue[i];
      }
      ADC_ConvertedValue_average = ADC_ConvertedValue_TEMP/15;    //全局变量ADC_ConvertedValue_average

      DMA_ClearITPendingBit(DMA1_IT_TC1);
      DMA_ClearFlag(DMA1_FLAG_TC1);
}

//============================================
//函数名称:void GPIO_Configuration(void)
//功能描述:ADC引脚配置
//输入:无
//输出:无
//============================================
void GPIO_Configuration(void)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      //=======================ADC通道配置========================
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
      GPIO_Init(GPIOB, &GPIO_InitStructure);                               // PB0,输入时不用设置速率
}

//============================================
//函数名称:void NVIC_Configuration(void)
//功能描述:中断配置
//输入:无
//输出:无
//============================================
void NVIC_Configuration(void)
{
   NVIC_InitTypeDef NVIC_InitStructure;

      /* Configure the NVIC Preemption Priority Bits */
   NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn;
NVIC_Init(&NVIC_InitStructure);
}

参考：STM32 ADC采集，DMA传输 DMA中断处理 – STM32/STM8单片机论坛 – ST MCU意法半导体官方技术支持论坛 – 21ic电子技术开发论坛