[求助] stm32f4用DCMI读取摄像头0V7620数据，并用DMA发送到ram

林立新 2014-3-31 20:50 楼主

用串口把数据发回来看，，发现全都是0
我的代码，，

void Camera_DMA_Init()
{

  DMA_InitTypeDef DMA_InitStructure;
  DMA_InitStructure.DMA_Channel = DMA_Channel_1;
  RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_DMA2, ENABLE);
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(DCMI_BASE + 0x28);
  DMA_InitStructure.DMA_Memory0BaseAddr =(uint32_t)(&CameraRecevie_Data);
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
  DMA_InitStructure.DMA_BufferSize = V*H/4;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize= DMA_PeripheralDataSize_Word;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
  DMA_Init(DMA2_Stream1, &DMA_InitStructure);

}

void DCMI_GPIO_Init()
{
  GPIO_InitTypeDef GPIO_InitStructure;
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB | RCC_AHB1Periph_GPIOC, ENABLE); /* 使能 DCMI GPIOs 时钟 */
  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);

}

void Camera_DCMI_Init()
{
  DCMI_InitTypeDef DCMI_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;


  DCMI_GPIO_Init();

  RCC_AHB2PeriphClockCmd(RCC_AHB2Periph_DCMI, ENABLE);

  DCMI_InitStructure.DCMI_CaptureMode = DCMI_CaptureMode_Continuous;  //连续模式
  DCMI_InitStructure.DCMI_SynchroMode = DCMI_SynchroMode_Hardware; //嵌入式
  DCMI_InitStructure.DCMI_PCKPolarity = DCMI_PCKPolarity_Falling;    //下降沿
  DCMI_InitStructure.DCMI_VSPolarity = DCMI_VSPolarity_High; //
  DCMI_InitStructure.DCMI_HSPolarity = DCMI_HSPolarity_High; //
  DCMI_InitStructure.DCMI_CaptureRate = DCMI_CaptureRate_All_Frame; //帧捕捉频率
  DCMI_InitStructure.DCMI_ExtendedDataMode = DCMI_ExtendedDataMode_8b;//指定数据宽度
  DCMI_Init(&DCMI_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);


  DCMI_ITConfig(DCMI_IT_VSYNC, ENABLE);
  DCMI_ITConfig(DCMI_IT_LINE, ENABLE);
  DCMI_ITConfig(DCMI_IT_FRAME, ENABLE);
  DCMI_ITConfig(DCMI_IT_OVF, ENABLE);
  DCMI_ITConfig(DCMI_IT_ERR, ENABLE);

}

void Ov7620_Init()
{
  Camera_DCMI_Init();
  Camera_DMA_Init();

}

  int main(void)
{
uint16_t i,j;
//NVIC_Config();
UART2_Init();
Ov7620_Init();
DMA_Cmd(DMA2_Stream1, ENABLE);
DCMI_Cmd(ENABLE);
DCMI_CaptureCmd(ENABLE);
while(1)
{
   for(i=0;i    {for(j=0;j    {
      USART_SendData(USART2,CameraRecevie_Data[i][j]);
      USART_SendData(USART2,'a');
      }

}
}
}