STM32f407+OV7670+USART1上传pc全是0

chuxue · 发表于 2015-4-20 16:00:02

大家好，初学f407，做ov7670摄像头实验，图像格式为QCIF（176*144，1帧数据占12672字节:176/2*144/2*2） RGB565。使用帧中断中通过串口1把数据传到pc上，可是PC上看不到图像，十六进制浏览全是0，在论坛里也看了很多相关的帖子，调了好几天都没有解决。所以求助大家，希望大家我分析给些建议。一下是实验配置代码：内存数组定义 uint8_t buf_byte[12672]
/*OV7670 QCIF RGB565 */
{0x3a, 0x04},//dummy
{0x40, 0xd0},//565
{0x12, 0x0c},//QCIF RGB

配置代码：
//DCMI配置
DCMI_InitStructure.DCMI_CaptureMode = DCMI_CaptureMode_Continuous;//????????
DCMI_InitStructure.DCMI_SynchroMode = DCMI_SynchroMode_Hardware;//????????HSYNC,VSYNC
DCMI_InitStructure.DCMI_PCKPolarity = DCMI_PCKPolarity_Falling;//PCLK ?????????§
DCMI_InitStructure.DCMI_VSPolarity = DCMI_VSPolarity_High;//VSYNC ?????????§
DCMI_InitStructure.DCMI_HSPolarity = DCMI_HSPolarity_High;//HSYNC ?????????§
DCMI_InitStructure.DCMI_CaptureRate = DCMI_CaptureRate_All_Frame;//????????
DCMI_InitStructure.DCMI_ExtendedDataMode = DCMI_ExtendedDataMode_8b;//8??????????
DCMI_Init(&DCMI_InitStructure);

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannel = DCMI_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;//??????????1
NVIC_InitStructure.NVIC_IRQChannelSubPriority =3; //×???????3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ?¨??????
NVIC_Init(&NVIC_InitStructure); //?ù?????¨????????????VIC?????÷??

//????DMA Stream
DMA_DeInit(DMA2_Stream1);
DMA_InitStructure.DMA_Channel = DMA_Channel_1; //?¨??1 DCMI?¨??
DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&DCMI->DR; //???è???·??

CMI->DR
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)buf_byte;//DMA ?????÷0???·
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;//???è???????÷????
DMA_InitStructure.DMA_BufferSize =1;//??????????
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//???è·?????????
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//?????÷????????
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;//???è?????¤??:32??
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; //FIFO????
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;//??????FIFO
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;//???è??·?????????
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; //?????÷??·?????????
DMA_Init(DMA2_Stream1, &DMA_InitStructure);//??????DMA Stream
// DMA_ITConfig(DMA2_Stream1,DMA_IT_TC,ENABLE);

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

帧中断
//DCMI????·???????
void DCMI_IRQHandler(void)
{
if(DCMI_GetITStatus(DCMI_IT_FRAME)==SET)//??????????????
{
DCMI_ClearITPendingBit(DCMI_IT_FRAME);//??????????
DCMI_CaptureCmd(DISABLE);

for(i=0;i<BUFSIZE-1;i++)
{
USART_SendData(USART1,buf_byte);
while(USART_GetFlagStatus(USART1,USART_FLAG_TC)==RESET);
}
DCMI_CaptureCmd(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);
}
}