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3：
FIFO_RCLK_H();
FIFO_RCLK_L();
CMOS_Data |= (GPIOF->IDR>>8) & 0x00ff;
2，