一、简介:
OV7670一般模块指低成本数字输出CMOS摄像头,其摄像头包含30w像素的CMOS图像感光芯片,3.6mm焦距的镜头和镜头座,板载CMOS芯片所需要的各种不同电源(电源要求详见芯片的数据文件),板子同时引出控制管脚和数据管脚,方便操作和使用。
二、管脚定义
3V3-----输入电源电压(推荐使用3.3,5V也可,但不推荐)
GDN-----接地点
SIO_C---SCCB接口的控制时钟(注意:部分低级单片机需要上拉控制,和I2C接口类似) SIO_D---SCCB接口的串行数据输入(出)端(注意:部分低级单片机需要上拉控制,和I2C接口类似)
VSYNC---帧同步信号(输出信号)
HREF----行同步信号(输出信号)
PCLK----像素时钟(输出信号)
XCLCK---时钟信号(输入信号,时钟速度可以高达24M)
D0-D7---数据端口(输出信号)
RESTE---复位端口(正常使用拉高)
PWDN----功耗选择模式(正常使用拉低)
三、SCCB通讯时序
其作用是设置芯片内部寄存器,以控制图像的各种所需功能。其时序和一般的I2C时序相似,部分低级单片机要接上拉电阻。
行输出时序
行输出时序可用来控制一行像素的输出情况,HREF即一行输出的开始和结束信号,同时在像素时钟的同步下,输出8位的像素信号行输出时序图:
全帧输出下的时序情况:
该图显示的是一副图像输出的情况下,各控制信号和数据信号的输出。图中,VGA=640X480大小情况下,帧同步信号,行同步信号(HREF或 者HSYNC,注:HSYNC在其它场合下使用,CMOS可以设置,更多时候用HREF即可)如图:
//ov7670.c
void CLK_init_ON(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP ;
GPIO_Init(GPIOA, &GPIO_InitStructure);
RCC_MCOConfig(RCC_MCO_HSE );//hsi
}
void CLK_init_OFF(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
void OV7670_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
GPIO_InitStructure.GPIO_Pin = 0X0BFF;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;//GPIO_Mode_AF_OD GPIO_Mode_AF_PP GPIO_Mode_IPU GPIO_Mode_IN_FLOATING
//GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}
void OV7670_GPIO_CONTRL_CONFIG(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = LCD_HREF_BIT|LCD_VSYNC_BIT|LCD_PCLK_BIT;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOC, &GPIO_InitStructure);
RCC_MCOConfig(RCC_MCO_HSE );//hsi
}
//功能:写OV7670寄存器
//返回:1-成功 0-失败
unsigned char wrOV7670Reg(unsigned char regID, unsigned char regDat)
{
startSCCB();
if(0==SCCBwriteByte(0x42))
{
stopSCCB();
return(0);
}
delay_us(100);
if(0==SCCBwriteByte(regID))
{
stopSCCB();
return(0);
}
delay_us(100);
if(0==SCCBwriteByte(regDat))
{
stopSCCB();
return(0);
}
stopSCCB();
return(1);
}
//功能:读OV7670寄存器
//返回:1-成功 0-失败
unsigned char rdOV7670Reg(unsigned char regID, unsigned char *regDat)
{
//通过写操作设置寄存器地址
startSCCB();
if(0==SCCBwriteByte(0x42))
{
stopSCCB();
return(0);
}
delay_us(100);
if(0==SCCBwriteByte(regID))
{
stopSCCB();
return(0);
}
stopSCCB();
delay_us(100);
//设置寄存器地址后,才是读
startSCCB();
if(0==SCCBwriteByte(0x43))
{
stopSCCB();
return(0);
}
delay_us(100);
*regDat=SCCBreadByte();
noAck();
stopSCCB();
return(1);
}
//(140,16,640,480) is good for VGA
//(272,16,320,240) is good for QVGA
/* config_OV7670_window */
void OV7670_config_window(unsigned int startx,unsigned int starty,unsigned int width, unsigned int height)
{
unsigned int endx;
unsigned int endy;// "v*2"必须
unsigned char temp_reg1, temp_reg2;
unsigned char temp=0;
endx=(startx+width);
endy=(starty+height+height);// "v*2"必须
rdOV7670Reg(0x03, &temp_reg1 );
temp_reg1 &= 0xf0;
rdOV7670Reg(0x32, &temp_reg2 );
temp_reg2 &= 0xc0;
// Horizontal
temp = temp_reg2|((endx&0x7)<<3)|(startx&0x7);
wrOV7670Reg(0x32, temp );
temp = (startx&0x7F8)>>3;
wrOV7670Reg(0x17, temp );
temp = (endx&0x7F8)>>3;
wrOV7670Reg(0x18, temp );
// Vertical
temp =temp_reg1|((endy&0x3)<<2)|(starty&0x3);
wrOV7670Reg(0x03, temp );
temp = starty>>2;
wrOV7670Reg(0x19, temp );
temp = endy>>2;
wrOV7670Reg(0x1A, temp );
}set_OV7670reg(void)
{
wrOV7670Reg(0x8c, 0x00);
wrOV7670Reg(0x3a, 0x04);
wrOV7670Reg(0x40, 0xd0);
wrOV7670Reg(0x8c, 0x00);
wrOV7670Reg(0x12, 0x14);
wrOV7670Reg(0x32, 0x80);
wrOV7670Reg(0x17, 0x16);
wrOV7670Reg(0x18, 0x04);
wrOV7670Reg(0x19, 0x02);
wrOV7670Reg(0x1a, 0x7b);
wrOV7670Reg(0x03, 0x06);
wrOV7670Reg(0x0c, 0x04);
wrOV7670Reg(0x3e, 0x00);
wrOV7670Reg(0x70, 0x3a);
wrOV7670Reg(0x71, 0x35);
wrOV7670Reg(0x72, 0x11);
wrOV7670Reg(0x73, 0x00);
wrOV7670Reg(0xa2, 0x00);
wrOV7670Reg(0x11, 0xff);
//wrOV7670Reg(0x15 , 0x31);
wrOV7670Reg(0x7a, 0x20);
wrOV7670Reg(0x7b, 0x1c);
wrOV7670Reg(0x7c, 0x28);
wrOV7670Reg(0x7d, 0x3c);
wrOV7670Reg(0x7e, 0x55);
wrOV7670Reg(0x7f, 0x68);
wrOV7670Reg(0x80, 0x76);
wrOV7670Reg(0x81, 0x80);
wrOV7670Reg(0x82, 0x88);
wrOV7670Reg(0x83, 0x8f);
wrOV7670Reg(0x84, 0x96);
wrOV7670Reg(0x85, 0xa3);
wrOV7670Reg(0x86, 0xaf);
wrOV7670Reg(0x87, 0xc4);
wrOV7670Reg(0x88, 0xd7);
wrOV7670Reg(0x89, 0xe8);
wrOV7670Reg(0x32,0xb6);
wrOV7670Reg(0x13, 0xff);
wrOV7670Reg(0x00, 0x00);
wrOV7670Reg(0x10, 0x00);
wrOV7670Reg(0x0d, 0x00);
wrOV7670Reg(0x14, 0x4e);
wrOV7670Reg(0xa5, 0x05);
wrOV7670Reg(0xab, 0x07);
wrOV7670Reg(0x24, 0x75);
wrOV7670Reg(0x25, 0x63);
wrOV7670Reg(0x26, 0xA5);
wrOV7670Reg(0x9f, 0x78);
wrOV7670Reg(0xa0, 0x68);
// wrOV7670Reg(0xa1, 0x03);//0x0b,
wrOV7670Reg(0xa6, 0xdf);
wrOV7670Reg(0xa7, 0xdf);
wrOV7670Reg(0xa8, 0xf0);
wrOV7670Reg(0xa9, 0x90);
wrOV7670Reg(0xaa, 0x94);
//wrOV7670Reg(0x13, 0xe5);
wrOV7670Reg(0x0e, 0x61);
wrOV7670Reg(0x0f, 0x43);
wrOV7670Reg(0x16, 0x02);
wrOV7670Reg(0x1e, 0x37);
wrOV7670Reg(0x21, 0x02);
wrOV7670Reg(0x22, 0x91);
wrOV7670Reg(0x29, 0x07);
wrOV7670Reg(0x33, 0x0b);
wrOV7670Reg(0x35, 0x0b);
wrOV7670Reg(0x37, 0x3f);
wrOV7670Reg(0x38, 0x01);
wrOV7670Reg(0x39, 0x00);
wrOV7670Reg(0x3c, 0x78);
wrOV7670Reg(0x4d, 0x40);
wrOV7670Reg(0x4e, 0x20);
wrOV7670Reg(0x69, 0x00);
wrOV7670Reg(0x6b, 0x4a);
wrOV7670Reg(0x74, 0x19);
wrOV7670Reg(0x8d, 0x4f);
wrOV7670Reg(0x8e, 0x00);
wrOV7670Reg(0x8f, 0x00);
wrOV7670Reg(0x90, 0x00);
wrOV7670Reg(0x91, 0x00);
wrOV7670Reg(0x92, 0x00);
wrOV7670Reg(0x96, 0x00);
wrOV7670Reg(0x9a, 0x80);
wrOV7670Reg(0xb0, 0x84);
wrOV7670Reg(0xb1, 0x0c);
wrOV7670Reg(0xb2, 0x0e);
wrOV7670Reg(0xb3, 0x82);
wrOV7670Reg(0xb8, 0x0a);
wrOV7670Reg(0x43, 0x14);
wrOV7670Reg(0x44, 0xf0);
wrOV7670Reg(0x45, 0x34);
wrOV7670Reg(0x46, 0x58);
wrOV7670Reg(0x47, 0x28);
wrOV7670Reg(0x48, 0x3a);
wrOV7670Reg(0x59, 0x88);
wrOV7670Reg(0x5a, 0x88);
wrOV7670Reg(0x5b, 0x44);
wrOV7670Reg(0x5c, 0x67);
wrOV7670Reg(0x5d, 0x49);
wrOV7670Reg(0x5e, 0x0e);
wrOV7670Reg(0x64, 0x04);
wrOV7670Reg(0x65, 0x20);
wrOV7670Reg(0x66, 0x05);wrOV7670Reg(0x94, 0x04);
wrOV7670Reg(0x95, 0x08);wrOV7670Reg(0x6c, 0x0a);
wrOV7670Reg(0x6d, 0x55);
wrOV7670Reg(0x6e, 0x11);
wrOV7670Reg(0x6f, 0x9f);wrOV7670Reg(0x6a, 0x40);
wrOV7670Reg(0x01, 0x40);
wrOV7670Reg(0x02, 0x40);
//wrOV7670Reg(0x13, 0xe7);
wrOV7670Reg(0x15, 0x00);
wrOV7670Reg(0x4f, 0x80);
wrOV7670Reg(0x50, 0x80);
wrOV7670Reg(0x51, 0x00);
wrOV7670Reg(0x52, 0x22);
wrOV7670Reg(0x53, 0x5e);
wrOV7670Reg(0x54, 0x80);
wrOV7670Reg(0x58, 0x9e);wrOV7670Reg(0x41, 0x08);
wrOV7670Reg(0x3f, 0x00);
wrOV7670Reg(0x75, 0x05);
wrOV7670Reg(0x76, 0xe1);wrOV7670Reg(0x4c, 0x00);
wrOV7670Reg(0x77, 0x01);
wrOV7670Reg(0x3d, 0xc1);
wrOV7670Reg(0x4b, 0x09);
wrOV7670Reg(0xc9, 0x60);
//wrOV7670Reg(0x41, 0x38);
wrOV7670Reg(0x56, 0x40);
wrOV7670Reg(0x34, 0x11);
wrOV7670Reg(0x3b, 0x02);
wrOV7670Reg(0xa4, 0x89);
wrOV7670Reg(0x96, 0x00);
wrOV7670Reg(0x97, 0x30);
wrOV7670Reg(0x98, 0x20);
wrOV7670Reg(0x99, 0x30);
wrOV7670Reg(0x9a, 0x84);
wrOV7670Reg(0x9b, 0x29);
wrOV7670Reg(0x9c, 0x03);
wrOV7670Reg(0x9d, 0x4c);
wrOV7670Reg(0x9e, 0x3f);wrOV7670Reg(0x09, 0x00);
wrOV7670Reg(0x3b, 0xc2);}
/* OV7670_init() */
//返回1成功,返回0失败
unsigned char OV7670_init(void)
{
unsigned char temp;
unsigned int i=0;OV7670_GPIO_Init();
OV7670_GPIO_CONTRL_CONFIG();
SCCB_GPIO_Config(); // io init..CLK_init_ON();
temp=0x80;
if(0==wrOV7670Reg(0x12, temp)) //Reset SCCB
{
return 0 ;
}
delay_ms(100);
set_OV7670reg(); OV7670_config_window(272,12,320,240);// set 240*320
return 0x01; //ok
}
//main.c
while(1!=OV7670_init());
while(1)
{
TimerCnt = 0;
temp7670 = 0;
CLK_init_ON(); // OV7670 XCLK 开
while(value & 0x0800) value = GPIOC->IDR; // Vsync=H
while((~value) & 0x0800) value = GPIOC->IDR; // Vhync=L
CLK_init_OFF(); //OV7670 XCLK 关
while(TimerCnt < 76800)
{
XCLK_L;
XCLK_H;
value = GPIOC->IDR;
temp7670 ++;
if(value & 0x0100) // HREF = H ||(LCD_PCLK_STATE)
{
if((temp7670 == 1))// 高字节||(value & 0x0200) ||(LCD_PCLK_STATE)
{
val1=value& 0x00ff;文章来源:https://www.toymoban.com/news/detail-638189.html}
else // 低字节 if((temp7670 != 1)||(LCD_PCLK_STATE))
{
val2= value<<8 ; //
val =ili9320_BGR2RGB(val1|val2);
temp7670 = 0;
LCD_WriteRAM(val); //TFT GRAM 数据
TimerCnt ++;
}
}
}
} 文章来源地址https://www.toymoban.com/news/detail-638189.html
到了这里,关于stm32(SCCB)+ov7670摄像头输出图像程序的文章就介绍完了。如果您还想了解更多内容,请在右上角搜索TOY模板网以前的文章或继续浏览下面的相关文章,希望大家以后多多支持TOY模板网!