DMA+ADC多通道采集，采用DMA完成中断

1万 · 2021-4-7 22:43

但是什么时候进中断，总是搞不清楚

1万 · 2021-4-7 22:45

ADC采集的数据会直接通过DMA存储到缓存数组中

1万 · 2021-4-7 22:47

然后DMA缓存的数组满了就会进入DMA中断？

1万 · 2021-4-7 22:49

楼主程序可以公开吗？贴程序看下吧，这么说看不出什么原因

1万 · 2021-4-7 22:51

#include "ADC_nofilter.h"
__IO uint16_t ADC_ConvertedValue[120];
void ADC1_GPIOA_Config(void)
{
      GPIO_InitTypeDef GPIO_InitTypeStructure;
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

      GPIO_InitTypeStructure.GPIO_Mode=GPIO_Mode_AIN;
      GPIO_InitTypeStructure.GPIO_Pin=GPIO_Pin_0|GPIO_Pin_1;
      GPIO_InitTypeStructure.GPIO_Speed=GPIO_Speed_50MHz;
      GPIO_Init(GPIOA,&GPIO_InitTypeStructure);

}
void ADC1_GPIOB_Config(void)
{
      GPIO_InitTypeDef GPIO_InitTypeStructure;
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
      GPIO_InitTypeStructure.GPIO_Mode=GPIO_Mode_AIN;
      GPIO_InitTypeStructure.GPIO_Pin=GPIO_Pin_1;
      GPIO_InitTypeStructure.GPIO_Speed=GPIO_Speed_50MHz;
      GPIO_Init(GPIOB,&GPIO_InitTypeStructure);

}
void ADC1_Mode_Config(void)
{
      //结构体变量定义
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);
      RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);
      DMA_InitTypeDef DMA_InitTypeStructure;
      ADC_InitTypeDef ADC_InitTypeStructure;
      NVIC_InitTypeDef NVIC_InitStructure;
      //volatile的作用就是保证指令不会因为编译器优化而省略
      //DMA配置

      DMA_DeInit(DMA1_Channel1);
      DMA_InitTypeStructure.DMA_BufferSize=AD_DATASize;
      DMA_InitTypeStructure.DMA_DIR=DMA_DIR_PeripheralSRC;
      DMA_InitTypeStructure.DMA_M2M=DMA_M2M_Disable;
      DMA_InitTypeStructure.DMA_MemoryBaseAddr=(u32)&ADC_ConvertedValue;//说是32位的实际上就是用到低16位
      DMA_InitTypeStructure.DMA_MemoryInc=DMA_MemoryInc_Enable;
      DMA_InitTypeStructure.DMA_Mode=DMA_Mode_Circular;
      DMA_InitTypeStructure.DMA_PeripheralBaseAddr=(u32)(&(ADC1->DR));
      DMA_InitTypeStructure.DMA_PeripheralDataSize=DMA_PeripheralDataSize_Byte;
      DMA_InitTypeStructure.DMA_PeripheralInc=DMA_PeripheralInc_Disable;
      DMA_InitTypeStructure.DMA_Priority=DMA_Priority_High;
      DMA_Init(DMA1_Channel1,&DMA_InitTypeStructure);
      DMA_Cmd(DMA1_Channel1,DISABLE);//暂时先关闭DMA，为了延时开启AD采样
      DMA_ITConfig(DMA1_Channel1,DMA_IT_TC,ENABLE);
      DMA_ClearITPendingBit(DMA1_IT_TC1);
      //DMA_NVIC配置
      NVIC_InitStructure.NVIC_IRQChannel=DMA1_Channel1_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority=2;
      NVIC_Init(&NVIC_InitStructure);

      //ADC配置

      ADC_InitTypeStructure.ADC_ContinuousConvMode=ENABLE;
      ADC_InitTypeStructure.ADC_DataAlign=ADC_DataAlign_Right;
      ADC_InitTypeStructure.ADC_ExternalTrigConv=ADC_ExternalTrigConv_None;
      ADC_InitTypeStructure.ADC_Mode=ADC_Mode_Independent;
      ADC_InitTypeStructure.ADC_NbrOfChannel=3;
      ADC_InitTypeStructure.ADC_ScanConvMode=ENABLE;//因为要同时开启两个adc，所以要开启扫描模式了
      ADC_Init(ADC1,&ADC_InitTypeStructure);
      //设置ADC时钟分频
      RCC_ADCCLKConfig(RCC_PCLK2_Div6);
      //ADC通道配置
      ADC_RegularChannelConfig(ADC1,ADC_Channel_0,1,ADC_SampleTime_239Cycles5);
      ADC_RegularChannelConfig(ADC1,ADC_Channel_1,2,ADC_SampleTime_239Cycles5);
      ADC_RegularChannelConfig(ADC1,ADC_Channel_9,3,ADC_SampleTime_239Cycles5);
      //ADC_DMA使能
      ADC_DMACmd(ADC1,DISABLE);

      ADC_Cmd(ADC1,ENABLE);
      //校准复位
      ADC_ResetCalibration(ADC1);
      while(ADC_GetResetCalibrationStatus(ADC1));//为何没用==RESET？
      //校准启动
      ADC_StartCalibration(ADC1);
      while(ADC_GetCalibrationStatus(ADC1));
      //采用软件启动方式
      ADC_SoftwareStartConvCmd(ADC1,ENABLE);
}

void ADC1_ENABLE(void)
{
      DMA_Cmd(DMA1_Channel1,DISABLE);
      DMA_SetCurrDataCounter(DMA1_Channel1,AD_DATASize);
      DMA_Cmd(DMA1_Channel1,ENABLE);
      ADC_DMACmd(ADC1,ENABLE);

}
void ADC1_DISABLE(void)
{

      DMA_Cmd(DMA1_Channel1,DISABLE);
      ADC_DMACmd(ADC1,DISABLE);
}
void ADC1_Config(void)
{
      ADC1_GPIOA_Config();
      ADC1_GPIOB_Config();
      ADC1_Mode_Config();
}