1）使用MCO输入8MHZ时钟源到XCLK，设置帧同步信号完全错了，是寄存器配置的问题吗？
2）寄存器参考原子的例程，修改了PLL倍频，QVGA RGB565输出格式。
3）寄存器配置如下，搞了几天了，有经验的大神帮忙分析一下，谢谢！

[mw_shl_code=c,true]const char change_reg[][2]= { /*以下为OV7670 QVGA RGB565参数 */ {0x3a, 0x04},//dummy {0x40, 0xd0},//565 {0x12, 0x14},//QVGA,RGB输出 //输出窗口设置 {0x32, 0x80},//HREF control bit[2:0] HREF start 3 LSB bit[5:3] HSTOP HREF end 3LSB {0x17, 0x16},//HSTART start high 8-bit MSB {0x18, 0x04},//5 HSTOP end high 8-bit {0x19, 0x02}, {0x1a, 0x7b},//0x7a, {0x03, 0x06},//0x0a,帧竖直方向控制 {0x0c, 0x00}, {0x15, 0x00},//0x00 {0x3e, 0x00},//10 {0x70, 0x3a}, {0x71, 0x80},//彩条测试 默认值是35 {0x72, 0x11}, {0x73, 0x00},// {0xa2, 0x02},//15 {0x11, 0x81},//时钟分频设置,0,不分频. {0x7a, 0x20}, {0x7b, 0x1c}, {0x7c, 0x28}, {0x7d, 0x3c},//20 {0x7e, 0x55}, {0x7f, 0x68}, {0x80, 0x76}, {0x81, 0x80}, {0x82, 0x88}, {0x83, 0x8f}, {0x84, 0x96}, {0x85, 0xa3}, {0x86, 0xaf}, {0x87, 0xc4},//30 {0x88, 0xd7}, {0x89, 0xe8}, {0x13, 0xe0}, {0x00, 0x00},//AGC {0x10, 0x00}, {0x0d, 0x00},//全窗口， 位[5:4]: 01 半窗口，10 1/4窗口，11 1/4窗口 {0x14, 0x28},//0x38, limit the max gain {0xa5, 0x05}, {0xab, 0x07}, {0x24, 0x75},//40 {0x25, 0x63}, {0x26, 0xA5}, {0x9f, 0x78}, {0xa0, 0x68}, {0xa1, 0x03},//0x0b, {0xa6, 0xdf},//0xd8, {0xa7, 0xdf},//0xd8, {0xa8, 0xf0}, {0xa9, 0x90}, {0xaa, 0x94},//50 {0x13, 0xe5}, {0x0e, 0x61}, {0x0f, 0x4b}, {0x16, 0x02}, {0x1e, 0x27},//图像输出镜像控制.0x07 {0x21, 0x02}, {0x22, 0x91}, {0x29, 0x07}, {0x33, 0x0b}, {0x35, 0x0b},//60 {0x37, 0x1d}, {0x38, 0x71}, {0x39, 0x2a}, {0x3c, 0x78}, {0x4d, 0x40}, {0x4e, 0x20}, {0x69, 0x00}, {0x6b, 0x80},//PLL*6=48Mhz {0x74, 0x19}, {0x8d, 0x4f}, {0x8e, 0x00},//70 {0x8f, 0x00}, {0x90, 0x00}, {0x91, 0x00}, {0x92, 0x00},//0x19,//0x66 {0x96, 0x00}, {0x9a, 0x80}, {0xb0, 0x84}, {0xb1, 0x0c}, {0xb2, 0x0e}, {0xb3, 0x82},//80 {0xb8, 0x0a}, {0x43, 0x14}, {0x44, 0xf0}, {0x45, 0x34}, {0x46, 0x58}, {0x47, 0x28}, {0x48, 0x3a}, {0x59, 0x88}, {0x5a, 0x88}, {0x5b, 0x44},//90 {0x5c, 0x67}, {0x5d, 0x49}, {0x5e, 0x0e}, {0x64, 0x04}, {0x65, 0x20}, {0x66, 0x05}, {0x94, 0x04}, {0x95, 0x08}, {0x6c, 0x0a}, {0x6d, 0x55}, {0x4f, 0x80}, {0x50, 0x80}, {0x51, 0x00}, {0x52, 0x22}, {0x53, 0x5e}, {0x54, 0x80}, //{0x54, 0x40},//110 {0x09, 0x03},//驱动能力最大 {0x6e, 0x11},//100 {0x6f, 0x9f},//0x9e for advance AWB {0x55, 0x00},//亮度 {0x56, 0x40},//对比度 0x40 {0x57, 0x40},//0x40, change according to Jim's request /////////////////////////////////////////////////////////////////////// //以下部分代码由开源电子网网友:duanzhang512 提出 //添加此部分代码将可以获得更好的成像效果,但是最下面一行会有蓝 {MOD}的抖动. //如不想要,可以屏蔽此部分代码.然后将:OV7670_Window_Set(12,176,240,320); //改为:OV7670_Window_Set(12,174,240,320);,即可去掉最下一行的蓝 {MOD}抖动 {0x6a, 0x40}, {0x01, 0x40}, {0x02, 0x40}, {0x13, 0xe7}, {0x15, 0x00}, {0x58, 0x9e}, {0x41, 0x08}, {0x3f, 0x00}, {0x75, 0x05}, {0x76, 0xe1}, {0x4c, 0x00}, {0x77, 0x01}, {0x3d, 0xc2}, {0x4b, 0x09}, {0xc9, 0x60}, {0x41, 0x38}, {0x34, 0x11}, {0x3b, 0x02}, {0xa4, 0x89}, {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}, {0x79, 0x26}, {0x09, 0x00}, /////////////////////////////////////////////////////////////////////// }; [/mw_shl_code]