首先必须保证ov7670能够初始化。初始化主要用SCCB，其实也就是一IIC，IIC就不用说了，有两种方式，一种是将IO配置成输入，输出；另一种就是将IO配置成开漏输出，但是两个IO需要上拉电阻大概4.7K就可以了。关于初始化不正确的花屏现象有以下几点特征：

无头绪的花屏，但是有大的或者很亮的物体在摄像头前面时，隐约有物体的棱廓。

这里附上完全正确的初始化代码(要是这个初始化有错误，欢迎大家在博客上的唾骂)：

const  uint8_t OV7670_Reg[OV7670_REG_NUM][2]=

{

{0x3a, 0x04},

{0x40, 0x10},

{0x12, 0x14},

{0x32, 0x80},

{0x17, 0x17},

{0x18, 0x05},

{0x19, 0x02},

{0x1a, 0x7b},//0x7a,

{0x03, 0x0a},//0x0a,

{0x0c, 0x0c},

{0x3e, 0x00},//

{0x70, 0x00},

{0x71, 0x01},

{0x72, 0x11},

{0x73, 0x09},//

{0xa2, 0x02},

{0x11, 0x00},

{0x7a, 0x20},

{0x7b, 0x1c},

{0x7c, 0x28},

{0x7d, 0x3c},

{0x7e, 0x55},

{0x7f, 0x68},

{0x80, 0x76},

{0x81, 0x80},

{0x82, 0x88},

{0x83, 0x8f},

{0x84, 0x96},

{0x85, 0xa3},

{0x86, 0xaf},

{0x87, 0xc4},

{0x88, 0xd7},

{0x89, 0xe8},

{0x13, 0xe0},

{0x00, 0x00},

{0x10, 0x00},

{0x0d, 0x00},

{0x14, 0x38},

{0xa5, 0x05},

{0xab, 0x07},

{0x24, 0x75},

{0x25, 0x63},

{0x26, 0xA5},

{0x9f, 0x78},

{0xa0, 0x68},

{0xa1, 0x03},//0x0b,

{0xa6, 0xdf},//0xd8,

{0xa7, 0xdf},//0xd8,

{0xa8, 0xf0},

{0xa9, 0x90},

{0xaa, 0x94},

{0x13, 0xe5},

{0x0e, 0x61},

{0x0f, 0x4b},

{0x16, 0x02},

{0x1e, 0x27},//0x07,

{0x21, 0x02},

{0x22, 0x91},

{0x29, 0x07},

{0x33, 0x0b},

{0x35, 0x0b},

{0x37, 0x1d},

{0x38, 0x71},

{0x39, 0x2a},

{0x3c, 0x78},

{0x4d, 0x40},

{0x4e, 0x20},

{0x69, 0x5d},

{0x6b, 0x40},//PLL

{0x74, 0x19},

{0x8d, 0x4f},

{0x8e, 0x00},

{0x8f, 0x00},

{0x90, 0x00},

{0x91, 0x00},

{0x92, 0x00},//0x19,//0x66

{0x96, 0x00},

{0x9a, 0x80},

{0xb0, 0x84},

{0xb1, 0x0c},

{0xb2, 0x0e},

{0xb3, 0x82},

{0xb8, 0x0a},

{0x43, 0x14},

{0x44, 0xf0},

{0x45, 0x34},

{0x46, 0x58},

{0x47, 0x28},

{0x48, 0x3a},

{0x59, 0x88},

{0x5a, 0x88},

{0x5b, 0x44},

{0x5c, 0x67},

{0x5d, 0x49},

{0x5e, 0x0e},

{0x64, 0x04},

{0x65, 0x20},

{0x66, 0x05},

{0x94, 0x04},

{0x95, 0x08},

{0x6c, 0x0a},

{0x6d, 0x55},

{0x6e, 0x11},

{0x6f, 0x9f},

{0x6a, 0x40},

//{0x01, 0x60},

//{0x02, 0x60},

{0x13, 0xe7},

{0x15, 0x00},

{0x4f, 0x80},

{0x50, 0x80},

{0x51, 0x00},

{0x52, 0x22},

{0x53, 0x5e},

{0x54, 0x80},

{0x55, 0x00},//亮度

{0x56, 0x60},//对比度

{0x57, 0x90},

{0x58, 0x9e},

{0x41, 0x08},

{0x3f, 0x05},//边缘增强调整

{0x75, 0x05},

{0x76, 0xe1},

{0x4c, 0x0F},//噪声抑制强度

{0x77, 0x0a},

{0x3d, 0xc2},    //0xc0,

{0x4b, 0x09},

{0xc9, 0xc8},

{0x41, 0x38},

{0x34, 0x11},

{0x3b, 0x02},//0x00,//0x02,

{0xa4, 0x89},//0x88,

{0x96, 0x00},

{0x97, 0x30},

{0x98, 0x20},

{0x99, 0x30},

{0x9a, 0x84},

{0x9b, 0x29},

{0x9c, 0x03},

{0x9d, 0x4c},

{0x9e, 0x3f},

{0x78, 0x04},

{0x79, 0x01},

{0xc8, 0xf0},

{0x79, 0x0f},

{0xc8, 0x00},

{0x79, 0x10},

{0xc8, 0x7e},

{0x79, 0x0a},

{0xc8, 0x80},

{0x79, 0x0b},

{0xc8, 0x01},

{0x79, 0x0c},

{0xc8, 0x0f},

{0x79, 0x0d},

{0xc8, 0x20},

{0x79, 0x09},

{0xc8, 0x80},

{0x79, 0x02},

{0xc8, 0xc0},

{0x79, 0x03},

{0xc8, 0x40},

{0x79, 0x05},

{0xc8, 0x30},

{0x69, 0xaa},//

{0x09, 0x00},

{0x3b, 0x42},

{0x2d, 0x01},

};

花屏现象2：

IO口没有工作，请保证IO正常工作。花屏描述如下：

花屏现象3：

1，测试8色条纹的时候只有4条，仔细看是可以看出8条的；

2，可以看到物体很清晰的棱廓，但是颜色很乱。

现象分析：

很明显十六位的RGB数据高8位和低8位反了。出现这个现象有两个原因：

1，读取IO口数据的时候读反了

CMOS_Data = (GPIOF->IDR)& 0xff00;

FIFO_RCLK_H();

FIFO_RCLK_L();

CMOS_Data |= (GPIOF->IDR>>8)  & 0x00ff;

我的数据线配置的是PF8~PF15，如果把 CMOS_Data |= (GPIOF->IDR>>8)  & 0x00ff;     改成 CMOS_Data |= (GPIOF->IDR<<8)  & 0x00ff;就会出现上述花屏

2，

花屏差不多就这几种，两外想成功调试摄像头还应该注意一下几点：

1，如果你是用杜邦线，不要被数据线坑了。一般只要电平不衰减到70%一下，就没有问题。

2，杜邦线越短越好，最好用PCB制版