我用407的DCMI接口直接采集OV7620。没有写寄存器，默认配置输出应该是320*240分辨率的灰度图像。现在得到的图像只有一半是能看到图形的。另外一半是全白，不知道为什么？

我的DCMI配置如下：

 GPIO_InitTypeDef GPIO_InitStructure;        
    DCMI_InitTypeDef DCMI_InitStructure;
    DMA_InitTypeDef DMA_InitStructure;
     NVIC_InitTypeDef NVIC_InitStructure;
     //配置DCMI相关中断
     /* Enable the DMA Stream IRQ Channel */
       NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
    NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure); 

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
    NVIC_InitStructure.NVIC_IRQChannel = DCMI_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);    
     /* Enable DMA Stream Transfer Complete interrupt */
    
    RCC_AHB1PeriphClockCmd (RCC_AHB1Periph_DMA2, ENABLE);
    RCC_AHB2PeriphClockCmd(RCC_AHB2Periph_DCMI, ENABLE);   /* 使能 DCMI 时钟 */
     RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB | RCC_AHB1Periph_GPIOC, ENABLE); /* 使能 DCMI GPIOs 时钟 */
    //DMA2_NVIC_Config();
     /*GPIO configuration*/
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource4, GPIO_AF_DCMI);           //DCMI_HSYNC         
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_DCMI);           //DCMI_PIXCLK         
    GPIO_PinAFConfig(GPIOC, GPIO_PinSource6, GPIO_AF_DCMI);           //DCMI_D0
    GPIO_PinAFConfig(GPIOC, GPIO_PinSource7, GPIO_AF_DCMI);           //DCMI_D1
    GPIO_PinAFConfig(GPIOC, GPIO_PinSource8, GPIO_AF_DCMI);          //DCMI_D2
    GPIO_PinAFConfig(GPIOC, GPIO_PinSource9, GPIO_AF_DCMI);          //DCMI_D3
    GPIO_PinAFConfig(GPIOC, GPIO_PinSource11,GPIO_AF_DCMI);          //DCMI_D4
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_DCMI);          //DCMI_D5
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_DCMI);          //DCMI_VSYNC
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource8, GPIO_AF_DCMI);          //DCMI_D6
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource9, GPIO_AF_DCMI);          //DCMI_D7
    
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 |GPIO_Pin_6;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9 ;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_11 ;
    GPIO_Init(GPIOC, &GPIO_InitStructure);        
  
    /* DCMI configuration */ 
    DCMI_InitStructure.DCMI_CaptureMode = DCMI_CaptureMode_Continuous;   //连续捕获模式
    DCMI_InitStructure.DCMI_SynchroMode = DCMI_SynchroMode_Hardware;     //硬件同步模式
    DCMI_InitStructure.DCMI_PCKPolarity = DCMI_PCKPolarity_Rising;                     //像素时钟上沿
    DCMI_InitStructure.DCMI_VSPolarity = DCMI_VSPolarity_High;                     //帧同步上沿
    DCMI_InitStructure.DCMI_HSPolarity = DCMI_HSPolarity_Low;                     //水平同步上沿
    DCMI_InitStructure.DCMI_CaptureRate = DCMI_CaptureRate_All_Frame  ;        //整个帧图像
    DCMI_InitStructure.DCMI_ExtendedDataMode = DCMI_ExtendedDataMode_8b; //每次数据8位                                                                   
    DCMI_Init(&DCMI_InitStructure);  
    
     /* Configures the DMA2 to transfer Data from DCMI */          

    DMA_DeInit(DMA2_Stream1);
     while (DMA_GetCmdStatus(DMA2_Stream1) != DISABLE)
     {
     }
    DMA_InitStructure.DMA_Channel = DMA_Channel_1;                   
    DMA_InitStructure.DMA_PeripheralBaseAddr = DCMI_DR_ADDRESS;                 //照相机接口数据
    DMA_InitStructure.DMA_Memory0BaseAddr =(uint32_t)imageBuffer;                //存放照片数据的缓冲区;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;                     //设备到内存
    DMA_InitStructure.DMA_BufferSize = imageBufferSize;                           
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;         //设备端一次传送4个字节32位
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
    DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
    DMA_InitStructure.DMA_Priority = DMA_Priority_High;
    DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Enable;
    DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
    DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
    DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;  
    DMA_Init(DMA2_Stream1, &DMA_InitStructure); 
    
   
   //DMA_ITConfig(DMA2_Stream1, DMA_IT_TC, ENABLE);    
   DCMI_ITConfig(DCMI_IT_FRAME,ENABLE);  
   DCMI_ITConfig(DCMI_IT_VSYNC,DISABLE);  
   DCMI_ITConfig(DCMI_IT_LINE,DISABLE);        
   DCMI_ITConfig(DCMI_IT_ERR, DISABLE);
   DCMI_ITConfig(DCMI_IT_OVF, DISABLE);

然后中断优先级配置是：

NVIC_InitTypeDef NVIC_InitStructure;
  /* Enable the DMA Stream IRQ Channel */
  NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream1_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure); 

  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
  NVIC_InitStructure.NVIC_IRQChannel = DCMI_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);    
           /* Enable DMA Stream Transfer Complete interrupt */

DCMI中断服务函数如下：
//DCMI中断服务函数
void DCMI_IRQHandler(void)
{
  if(DCMI_GetITStatus(DCMI_IT_FRAME)==SET )
  {
  
    //DMA_Cmd(DMA2_Stream1, DISABLE); 
    //DCMI_Cmd(DISABLE); 
    DCMI_CaptureCmd(DISABLE); //停止采集
    
    for(int x=0;x<imageBufferSize;x++)
    {
      if(imageBuffer[x]==0xff)
      {
        imageBuffer[x]--;
      }
       USART_SendData (USART2, imageBuffer[x]);
       while(USART_GetFlagStatus(USART2,USART_FLAG_TC)==RESET);//通过串口发送图片
     
    }
      USART_SendData (USART2, 0xff);
       while(USART_GetFlagStatus(USART2,USART_FLAG_TC)==RESET);//通过串口发送图片
      
        DCMI_ClearITPendingBit(DCMI_IT_FRAME);
        
     // DCMI_Cmd(ENABLE); 
      DCMI_CaptureCmd(ENABLE); //开启采集
     // DMA_Cmd(DMA2_Stream1, ENABLE); 
     
  }
  if(DCMI_GetITStatus(DCMI_IT_OVF)==SET)
  {
    DCMI_ClearITPendingBit(DCMI_IT_OVF);
  }
    if(DCMI_GetITStatus(DCMI_IT_ERR)==SET)
  {
    DCMI_ClearITPendingBit(DCMI_IT_ERR);
  }
      if(DCMI_GetITStatus(DCMI_IT_VSYNC)==SET)
  {
   
    DCMI_ClearITPendingBit(DCMI_IT_VSYNC);
  }
  if(DCMI_GetITStatus(DCMI_IT_LINE)==SET)
  {
    DCMI_ClearITPendingBit(DCMI_IT_LINE);
  }
  
  
}

调了好久，求指导！