硬件电路中采用stm32直接连ov7670没有采用FIFO或者74LVC245，
硬件连接如下：
D0-D7：GPIOA0-7；
SIO-C：B5；
SIO-D：B2；
XCLK：A8；
PCLK：D14；
VSYNC：D6；
HREF：D3
连上电之后DVCC的电压是1.8V，正常，初始化之后DVCC变为2.15V，是不是不正常啊？
采用摄像头专家 wangguanfu 的程序，直接用stm32读取ov7670，然后送屏显示。
费了好久，终于可以初始化了，但是依然不显示图像，彩条测试也不通过有很多斑点，貌似有十几条斜着的条文，形状和颜色均不太不规则。
以下是我的初始化程序，数据读取，以及ov7670设置
/* OV7670_init() */
//返回1成功，返回0失败
uchar OV7670_init(void)
{
uchar temp;
uint j,i=0;
uchar tmp_reg[CHANGE_REG_NUM];
CLK_init_ON();
InitSCCB();//io init..
temp=0x80;
if(0==wrOV7670Reg(0x12, temp)) //Reset SCCB
{
return 0 ;
}
delay_ms(100);
temp=0x00;
rdOV7670Reg(0x0a, &temp);
rdOV7670Reg(0x0a, &temp);//这里比较奇怪，读一次可能不成功
if(temp!=0x76)
{
return 0;
}
temp=0x00;
rdOV7670Reg(0x0b, &temp);
rdOV7670Reg(0x0b, &temp);
if(temp!=0x73)
{
return 0;
}
delay_ms(10);
for(i=0;i<CHANGE_REG_NUM;i++)
{
if( 0 == wrOV7670Reg (change_reg[0],change_reg[1]) )
{
return 0;
}
}
//OV7670_Config_Window(272,17,320,240);// set 240*320 mmmmmmmmmmmmmmmmmmmmmmmmmmmm
delay_ms(300);
return 0x01; //ok
}
main函数里面：
while(1!=OV7670_init());//初始化ov7660
while (1)
{
aa=0;
i=0;
CLK_init_ON(); //OV7660 XCLK 开
while(value&0x0040)value=GPIOD->IDR; //Vsync=H
while((~value)&0x0040)value=GPIOD->IDR; //Vhync=L
LCD_WR_CMD(0x0050, 0); // Horizontal GRAM Start Address 区域
LCD_WR_CMD(0x0051, 239); // Horizontal GRAM End Address
LCD_WR_CMD(0x0052, 0); // Vertical GRAM Start Address
LCD_WR_CMD(0x0053, 319); // Vertical GRAM End Address
LCD_WR_CMD(0x0020, 0x16); // GRAM horizontal Address X 区域RAM位置
LCD_WR_CMD(0x0021, 0x28); // GRAM Vertical Address Y
LCD_WR_REG(0x0022);
delay_ms(30);
CLK_init_OFF(); //OV7660 XCLK 关
while (aa<76800)//QVGA RGB565
{
GPIO_ResetBits(GPIOA, GPIO_Pin_8); //CLK=0
GPIO_SetBits(GPIOA, GPIO_Pin_8); //CLK=1
i++;
if((GPIOD->IDR&0x1000)&&(GPIOD->IDR&0x0008))//HREF=H&&PCLK=1
{
value=GPIOA->IDR&0x00ff;
if(i==1)//高字节
{
val=value<<8;
}
else //低字节
{
val|=value;
i=0;
LCD_WR_Data(val);//TFT GRAM数据
aa++;
}
}
}
}
设置：
const char change_reg[CHANGE_REG_NUM][2]=
{
{0x3a, 0x04},
{0x40, 0xd0},
{0x12, 0x14},
{0x32, 0x80},
{0x17, 0x16},
{0x18, 0x04},
{0x19, 0x02},
{0x1a, 0x7a},//0x7a,7b
{0x03, 0x0a},//0x0a,06
{0x0c, 0x00},
{0x3e, 0x00},//
{0x70, 0x00},
{0x71, 0x80},
{0x72, 0x11},
{0x73, 0x00},//
{0xa2, 0x02},
{0x11, 0x01},
{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},//AGC
{0x10, 0x00},
{0x0d, 0x00},
{0x14, 0x28},//0x38, limit the max gain
{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, 0x07},//0x07,
{0x21, 0x02},
{0x22, 0x91},
{0x29, 0x07},
{0x33, 0x0b},
{0x35, 0x0b},
{0x37, 0x1d},
{0x38, 0x71},
{0x39, 0x2a},
{0x3c, 0x78},
{0x4d, 0x40},
{0x4e, 0x20},
{0x69, 0x55},
{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},//0x9e for advance AWB
{0x6a, 0x40},
{0x01, 0x40},
{0x02, 0x40},
{0x13, 0xe7},
{0x15, 0x00},
{0x4f, 0x80},
{0x50, 0x80},
{0x51, 0x00},
{0x52, 0x22},
{0x53, 0x5e},
{0x54, 0x80},
{0x55, 0x00},//亮度
{0x56, 0x40},//对比度
{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, 0x60},
{0x41, 0x38},
{0x56, 0x40},//0x40, change according to Jim's request
{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},
{0x79, 0x26},
{0x09, 0x03},
{0x3b, 0x42},//0x82,//0xc0,//0xc2, //night mode
由于手里没相机，显示图片暂时不传，反正没图像，很花很乱 |
发表于 2011-3-16 10:51:12
楼主
