STM32F407 DCMI采集OV7620的数据有一半是白色

给河马刷牙 · 发表于 2014-12-1 19:17:24

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 */