ADC采集正弦波，DAM采用循环模式和一般模式数据不对

2万 · 2022-4-10 21:24

什么原因呢

1万 · 2022-4-10 21:26

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

2万 · 2022-4-10 21:29

void TIM_Init()
{
      TIM_TimeBaseInitTypeDef    TIM_TimeBaseStructure;
      TIM_OCInitTypeDef                      TIM_OCInitStructure;
      GPIO_InitTypeDef                      GPIO_InitStructure;

      RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);

//       GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_9 ;
//       GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
//       GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
//       GPIO_Init(GPIOB, &GPIO_InitStructure);

      TIM_TimeBaseStructure.TIM_Period = 600-1;                                                                //µ±¶¨Ê±Æ÷´Ó0¼ÆÊýµ½255£¬¼´Îª266´Î£¬ÎªÒ»¸ö¶¨Ê±ÖÜÆÚ
      TIM_TimeBaseStructure.TIM_Prescaler =0;                                                                   //ÉèÖÃÔ¤·ÖÆµ£º
      TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1 ;                      //ÉèÖÃÊ±ÖÓ·ÖÆµÏµÊý£º²»·ÖÆµ(ÕâÀïÓÃ²»µ½)
      TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;       //ÏòÉÏ¼ÆÊýÄ£Ê½
      TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);

      TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
      TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
      TIM_OCInitStructure.TIM_Pulse = 100;
      TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;

      TIM_OC4Init(TIM4, &TIM_OCInitStructure);
      TIM_OC4PreloadConfig(TIM4, TIM_OCPreload_Enable);

      TIM_ARRPreloadConfig(TIM4, ENABLE);
      TIM_Cmd(TIM4, ENABLE);
}

void DMA_init(void)
{
      DMA_InitTypeDef  DMA_InitStructure;
      NVIC_InitTypeDef NVIC_InitStructure;
      RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

      DMA_DeInit(DMA1_Channel1);
      DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&( ADC1->DR ));                               //ADCµØÖ·
      DMA_InitStructure.DMA_MemoryBaseAddr = (u32)ADC1_Buf;       //ÄÚ´æµØÖ·
      DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
      DMA_InitStructure.DMA_BufferSize = 256;
      DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;       //ÍâÉèµØÖ·¹Ì¶¨
      DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;                               //ÄÚ´æµØÖ·¹Ì¶¨
      DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;       //°ë×Ö
      DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
      DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;                                                                               //Ñ»·´«Êä
      DMA_InitStructure.DMA_Priority = DMA_Priority_High;
      DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
      DMA_Init(DMA1_Channel1, &DMA_InitStructure);
      DMA_Cmd(DMA1_Channel1, ENABLE);

      NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);
      DMA_ITConfig(DMA1_Channel1, DMA_IT_TC , ENABLE);    //¿ªÆô×ª»»Íê³ÉÖÐ¶Ï
}
void ADC_Configuration(void)
{

2万 · 2022-4-10 21:34

2万 · 2022-4-10 21:38

1万 · 2022-4-10 21:41

我看你NORMAL模式没问题，而循环模式有问题，

1万 · 2022-4-10 21:44

除了DMA模式差别外，还有其它时间参数的差异吗？

1万 · 2022-4-10 21:46

感觉是循环模式导致数据出现了覆盖现象。

1万 · 2022-4-10 21:49

我改成了一般模式，然后在传输完成中断里再次启动DMA传输