stm32f407DMA不起作用，请大神们帮帮我

csol6661588 · 发表于 2021-7-17 14:21:42

想做一个频谱仪，通过DMA中断来进行FFT，但是在DMA传输ADC数据这一块出现了问题，ADC正常工作，但是ADC的数据无法传到指定的数组，ADC_ConvertedValue[ADC_LEN]一直为零宏定义与声明
#define ADC1_DR_Address ((uint32_t)ADC1+0x4c)
uint16_t ADC_ConvertedValue[ADC_LEN]; //256

DMA配置
void ADC1_DMA1_Init(void)
{
DMA_InitTypeDef DMA_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
while(DMA_GetCmdStatus(DMA2_Stream0) != DISABLE){}
DMA_DeInit(DMA2_Stream0);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;
DMA_InitStructure.DMA_Memory0BaseAddr = (u32)ADC_ConvertedValue;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = ADC_LEN;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_Channel = DMA_Channel_0;
DMA_Init(DMA2_Stream0, &DMA_InitStructure);

DMA_ClearFlag(DMA2_Stream0,DMA_FLAG_TCIF0|DMA_FLAG_TCIF4);
DMA_ITConfig(DMA2_Stream0,DMA_IT_TC ,ENABLE);
DMA_Cmd(DMA2_Stream0, ENABLE);

}

ADC配置
void  ADC1_Init(void)
{
  GPIO_InitTypeDef  GPIO_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
ADC_InitTypeDef    ADC_InitStructure;

  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);//使能GPIOA时钟
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); //使能ADC1时钟

  //先初始化ADC1通道6 IO口
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;//PA6
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;//模拟输入
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;//不带上下拉
  GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化

RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,ENABLE);    //ADC1复位
RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,DISABLE); //复位结束

  ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;//独立模式
  ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;//两个采样阶段之间的延迟5个时钟
  ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled; //DMA失能
  ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;//预分频4分频。ADCCLK=PCLK2/4=84/4=21Mhz,ADC时钟最好不要超过36Mhz
  ADC_CommonInit(&ADC_CommonInitStructure);//初始化

  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;//12位模式
  ADC_InitStructure.ADC_ScanConvMode = DISABLE;//非扫描模式
  ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;//非连续转换
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;
  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConv_T4_CC4;//开启触发检测，TIM4触发
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;//右对齐
  ADC_InitStructure.ADC_NbrOfConversion = 1;//1个转换在规则序列中也就是只转换规则序列1
  ADC_Init(ADC1, &ADC_InitStructure);//ADC初始化
ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 1, ADC_SampleTime_3Cycles );

ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
   ADC_DMACmd(ADC1, ENABLE);
ADC_Cmd(ADC1, ENABLE);//开启AD转换器
// ADC_SoftwareStartConv(ADC1);

}