stm32h743 adc（dma模式）只能采到一次ad值，各位大侠帮忙找下原因*_*

slzfqzh · 发表于 2019-8-8 17:50:16

以下函数，能读取ad值，但值一直不变，只能读取一次

ADC_HandleTypeDef ADC1_Handler;//ADC句柄
ADC_ChannelConfTypeDef ADC1_ChanConf;
DMA_HandleTypeDef  ADC1DMA_Handler;    //DMA句柄
uint32_t aAD_Data[30];
//初始化ADC
//ch: ADC_channels
//通道值 0~16取值范围为：ADC_CHANNEL_0~ADC_CHANNEL_16
void MY_ADC_Init(void)
{
      GPIO_InitTypeDef GPIO_Initure;
__HAL_RCC_ADC12_CLK_ENABLE();          //使能ADC1/2时钟
__HAL_RCC_GPIOA_CLK_ENABLE();                      //开启GPIOA时钟
      __HAL_RCC_ADC_CONFIG(RCC_ADCCLKSOURCE_CLKP); //ADC外设时钟选择

GPIO_Initure.Pin=GPIO_PIN_5 | GPIO_PIN_6;          //PA5
GPIO_Initure.Mode=GPIO_MODE_ANALOG;    //模拟
GPIO_Initure.Pull=GPIO_NOPULL;       //不带上下拉
HAL_GPIO_Init(GPIOA,&GPIO_Initure);

      ADC1_Handler.Instance       = ADC1;
      HAL_ADC_DeInit(&ADC1_Handler);

ADC1_Handler.Instance=ADC1;
ADC1_Handler.Init.ClockPrescaler=ADC_CLOCK_SYNC_PCLK_DIV4;       //4分频，ADCCLK=PER_CK/4=64/4=16MHZ
ADC1_Handler.Init.Resolution=ADC_RESOLUTION_16B;                //16位模式
ADC1_Handler.Init.ScanConvMode=ENABLE;                         //扫描模式
ADC1_Handler.Init.EOCSelection=ADC_EOC_SEQ_CONV;                      //关闭EOC中断
      //ADC_EOC_SEQ_CONV
      //ADC_EOC_SINGLE_CONV
      ADC1_Handler.DMA_Handle=&ADC1DMA_Handler;
      ADC1_Handler.Init.LowPowerAutoWait=DISABLE;                                     //自动低功耗关闭
ADC1_Handler.Init.ContinuousConvMode=ENABLE;             //关闭连续转换
ADC1_Handler.Init.NbrOfConversion=2;                      //1个转换在规则序列中也就是只转换规则序列1
ADC1_Handler.Init.DiscontinuousConvMode=DISABLE;          //禁止不连续采样模式
ADC1_Handler.Init.NbrOfDiscConversion=0;                   //不连续采样通道数为0
ADC1_Handler.Init.ExternalTrigConv=ADC_SOFTWARE_START;    //软件触发
ADC1_Handler.Init.ExternalTrigConvEdge=ADC_EXTERNALTRIGCONVEDGE_NONE;//使用软件触发
      ADC1_Handler.Init.BoostMode=ENABLE;                                                       //BOOT模式关闭
      ADC1_Handler.Init.Overrun=ADC_OVR_DATA_OVERWRITTEN;                      //有新的数据的死后直接覆盖掉旧数据
      //ADC1_Handler.Init.Overrun=ADC_OVR_DATA_PRESERVED;
      ADC1_Handler.Init.OversamplingMode=DISABLE;                                     //过采样关闭
      ADC1_Handler.Init.ConversionDataManagement=ADC_CONVERSIONDATA_DMA_CIRCULAR;  //规则通道的数据仅仅保存在DR寄存器里面
HAL_ADC_Init(&ADC1_Handler);                               //初始化
      HAL_ADCEx_Calibration_Start(&ADC1_Handler,ADC_CALIB_OFFSET,ADC_SINGLE_ENDED); //ADC校准

      ADC1_ChanConf.Channel=ADC_CHANNEL_19;                            //通道
      ADC1_ChanConf.Rank=ADC_REGULAR_RANK_1;                         //1个序列
      ADC1_ChanConf.SamplingTime=ADC_SAMPLETIME_64CYCLES_5;             //采样时间
      ADC1_ChanConf.SingleDiff=ADC_SINGLE_ENDED;                               //单边采集
      ADC1_ChanConf.OffsetNumber=ADC_OFFSET_NONE;
      ADC1_ChanConf.Offset=0;
      HAL_ADC_ConfigChannel(&ADC1_Handler,&ADC1_ChanConf);       //通道配置

      ADC1_ChanConf.Channel=ADC_CHANNEL_3;                            //通道
      ADC1_ChanConf.Rank=ADC_REGULAR_RANK_2;                         //1个序列
      ADC1_ChanConf.SamplingTime=ADC_SAMPLETIME_64CYCLES_5;             //采样时间
      ADC1_ChanConf.SingleDiff=ADC_SINGLE_ENDED;                               //单边采集
      ADC1_ChanConf.OffsetNumber=ADC_OFFSET_NONE;
      ADC1_ChanConf.Offset=0;
      HAL_ADC_ConfigChannel(&ADC1_Handler,&ADC1_ChanConf);       //通道配置


      //HAL_ADC_Start(&ADC1_Handler);
      //HAL_ADC_PollForConversion(&ADC1_Handler,10);
}

void MYDMA_Config(DMA_Stream_TypeDef *DMA_Streamx)
{
      __HAL_RCC_DMA2_CLK_ENABLE();//DMA2时钟使能
__HAL_RCC_DMA1_CLK_ENABLE();//DMA1时钟使能


//Tx DMA配置
ADC1DMA_Handler.Instance=DMA_Streamx;                         //数据流选择
      ADC1DMA_Handler.Init.Request=DMA_REQUEST_ADC1;                                        //ADC1发送DMA
ADC1DMA_Handler.Init.Direction=DMA_PERIPH_TO_MEMORY;          //外设到存储器
ADC1DMA_Handler.Init.PeriphInc=DMA_PINC_DISABLE;                //外设非增量模式
ADC1DMA_Handler.Init.MemInc=DMA_MINC_ENABLE;                   //存储器增量模式
ADC1DMA_Handler.Init.PeriphDataAlignment=DMA_PDATAALIGN_WORD;//外设数据长度:16位
ADC1DMA_Handler.Init.MemDataAlignment=DMA_MDATAALIGN_WORD; //存储器数据长度:16位
ADC1DMA_Handler.Init.Mode=DMA_CIRCULAR;                         //外设流控模式
ADC1DMA_Handler.Init.Priority=DMA_PRIORITY_MEDIUM;             //中等优先级
ADC1DMA_Handler.Init.FIFOMode=DMA_FIFOMODE_DISABLE;
ADC1DMA_Handler.Init.FIFOThreshold=DMA_FIFO_THRESHOLD_FULL;
ADC1DMA_Handler.Init.MemBurst=DMA_PBURST_SINGLE;                               //存储器突发单次传输
ADC1DMA_Handler.Init.PeriphBurst=DMA_PBURST_SINGLE;                   //外设突发单次传输
      ADC1DMA_Handler.StreamBaseAddress=(uint32_t)aAD_Data;

      __HAL_LINKDMA(&ADC1_Handler,DMA_Handle,ADC1DMA_Handler); //将DMA与USART1联系起来(发送DMA)

      //HAL_DMA_DeInit(&ADC1DMA_Handler);
HAL_DMA_Init(&ADC1DMA_Handler);
      HAL_DMA_Start (&ADC1DMA_Handler,(u32)&ADC1->DR,(unsigned int)&aAD_Data,20);//

}

main()
{
      MY_ADC_Init();                               //初始化ADC1通道5
      MYDMA_Config(DMA1_Stream7);                               //初始化DMA
      while(1)
      {
            HAL_ADC_Start_DMA(&ADC1_Handler, (uint32_t *)aAD_Data,2);
            delay_ms(450);
            adcx=aAD_Data[0];
               delay_ms(450);
               HAL_ADC_Stop_DMA(&ADC1_Handler);
      }
}