MM32 用DMA读取ADC数据

1万 · 2021-5-20 09:53

芯片是MM32F3277
用DMA读取ADC中的数据。现在可以进入DMA中断，但调试器中AD_value一直没有值。求大佬指点一下。
#include "DMA_ADC.h"

uint16_t AD_value[10];  //ADC采样的数据经过DMA传输的数据放在这里
unsigned short LI_ADCflag=0;

//ADC I/O口初始化
void LI_ADC_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  RCC_AHBPeriphclockCmd(RCC_AHBENR_GPIOA|RCC_AHBENR_GPIOB,ENABLE); //使能ADC I/O时钟

  GPIO_InitStructure.GPIO_Pin=GPIO_Pin_4;       //通道引脚
  GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AIN; //电平输入
  GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
  GPIO_Init(GPIOA,&GPIO_InitStructure);

}

void LI_DMA_Init(void)
{

  DMA_InitTypeDef DMA_InitStructure;
  NVIC_InitTypeDef NVIC_InitStruct;

  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);    //DMA1时钟使能
  DMA_DeInit(DMA1_Channel1);

  DMA_InitStructure.DMA_PeripheralBaseAddr=(u32)&(ADC1->ADDATA); //ADC数据寄存器地址作为源
  DMA_InitStructure.DMA_MemoryBaseAddr=(u32)&AD_value;       //将ADC中的数据转移道AD_value中
  DMA_InitStructure.DMA_DIR=DMA_DIR_PeripheralSRC;                   //数据传输方向，外设作为源
  DMA_InitStructure.DMA_BufferSize=10;                                  //传输数据
  DMA_InitStructure.DMA_PeripheralInc=DMA_PeripheralInc_Disable;       //外设地址固定
  DMA_InitStructure.DMA_MemoryInc=DMA_MemoryInc_Enable;                //内存地址自增
  DMA_InitStructure.DMA_MemoryDataSize=DMA_MemoryDataSize_HalfWord;    //半字
  DMA_InitStructure.DMA_PeripheralDataSize=DMA_PeripheralDataSize_HalfWord;
  DMA_InitStructure.DMA_Mode=DMA_Mode_Circular;                      //循环传输
  DMA_InitStructure.DMA_Priority=DMA_Priority_High;                   //通道优先级为最高级
  DMA_InitStructure.DMA_M2M=DMA_M2M_Disable;                         //禁止内存到内存传输
  DMA_Init(DMA1_Channel1,&DMA_InitStructure);
  DMA_Cmd(DMA1_Channel1,ENABLE);                                     //DMA通道1使能


DMA_ITConfig(DMA1_Channel1,DMA_IT_TC,ENABLE);  //DMA中断配置

NVIC_InitStruct.NVIC_IRQChannel =DMA1_Channel1_IRQn;
NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStruct);

}

void LI_ADC_Init(void)
{
  ADC_InitTypeDef  ADC_InitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);          //使能ADC1的时钟

  ADC_InitStructure.ADC_Mode=ADC_Mode_Continuous_Scan;       //连续扫描
  ADC_InitStructure.ADC_DataAlign=ADC_DataAlign_Right;       //数据右对齐
  ADC_InitStructure.ADC_Resolution=ADC_Resolution_12b;       //分辨率12
  ADC_InitStructure.ADC_PRESCARE=ADC_PCLK2_PRESCARE_8;    //时钟分频8
  ADC_InitStructure.ADC_ExternalTrigConv=ADC_ExternalTrigConv_T1_CC1;
  ADC_Init(ADC1,&ADC_InitStructure);

  ADC_RegularChannelConfig(ADC1, ADC_Channel_4,0, ADC_SampleTime_239_5Cycles);

  ADC_DMACmd(ADC1,ENABLE); //向DMA发出请求
  ADC_Cmd(ADC1,ENABLE);


}
void DMA1_Channel1_IRQHandler(void)
{
if(DMA_GetITStatus(DMA1_IT_TC1)!=RESET)
  {
DMA_ClearITPendingBit(DMA1_IT_TC1);
ADC_SoftwareStartConvCmd(ADC1, DISABLE); //DMA传输20个数据完成，标志置1
LI_ADCflag = 1;
LED_Ctrl(LEDALL,RVS);    //LED翻转闪烁
delayms(200);
  }



}