首页 › 技术进阶 › 使用OV7670(带FIFO)能看清拍的东西，但是画面很难受

fan183579 发表于 2021-3-26 20:01

使用OV7670(带FIFO)能看清拍的东西，但是画面很难受

/*
CONNECTIONS:
OV7670D0->Arduino3
OV7670D1->Arduino4
OV7670D2->Arduino5
OV7670D3->Arduino6
OV7670D4->Arduino7
OV7670D5->Arduino8
OV7670D6->Arduino9
OV7670D7->Arduino10
OV7670FIFIO_RCK   ->ArduinoA0
OV7670FIFIO_OE      ->ArduinoA1
OV7670FIFIO_WR      ->ArduinoA2
OV7670FIFIO_RRST    ->ArduinoA3
OV7670SIO_C         ->ArduinoA5 （管脚不可调整为其他管脚）
OV7670SIO_D         ->ArduinoA4 （管脚不可调整为其他管脚）
OV7670FIFIO_WRST    ->Arduino 11
OV7670VSYNC         ->Arduino2   （管脚不可调整为其他管脚）
OV7670RESET         ->Arduino12
OV76703.3V          ->Arduino3.3V
OV7670GND         ->ArduinoGND
其余摄像头针脚可以不接(悬空)。
*/
#include <Wire.h> // I2C 协议必不可少的库
#define OV7670_ADDRESS    0x21
#define VSYNC      2
#define D0         3
#define D1         4
#define D2         5
#define D3         6
#define D4         7
#define D5         8
#define D6         9
#define D7         10
#define RESET      12

#define FIFO_WRST11
#define FIFO_WR   A2//#define FIFO_WR    A2
#define FIFO_RRSTA3
#define FIFO_RCK   A0
#define FIFO_OE    A1


unsigned char WrCmos7670(unsigned char regID, unsigned char regDat);
unsigned char rdCmos7670Reg(unsigned char regID);
unsigned char Cmos7670_init(void);
void set_Cmos7670reg(void);
unsigned char ov7670_data(void);
void IO_Init(void);


/****变量********/
unsigned char tmp;
uint16_t Vsync_Flag,i,j;
unsigned char t1,t2;

void setup() {
// put your setup code here, to run once:
Serial.begin(256000);
Wire.begin();//I2C 要开始了

IO_Init();

digitalWrite(RESET, LOW);
delay(20);
digitalWrite(RESET, HIGH);
while(1!=Cmos7670_init());   //CMOS初始化
tmp = rdCmos7670Reg(0x3A);
if(tmp == 0x04)
{
    }
    else
    {
      while(1);
      }
attachInterrupt(digitalPinToInterrupt(VSYNC), OV7670, FALLING);//设置触发中断的端口，中断后运行的程序和触发模式
}

void loop() {
// put your main code here, to run repeatedly:

}

void IO_Init(void)
{
pinMode(D0, INPUT);
pinMode(D1, INPUT);
pinMode(D2, INPUT);
pinMode(D3, INPUT);
pinMode(D4, INPUT);
pinMode(D5, INPUT);
pinMode(D6, INPUT);
pinMode(D7, INPUT);

pinMode(RESET, OUTPUT);

pinMode(FIFO_WRST, OUTPUT);
pinMode(FIFO_WR, OUTPUT);
pinMode(FIFO_RRST, OUTPUT);
pinMode(FIFO_RCK, OUTPUT);
pinMode(FIFO_OE, OUTPUT);

pinMode(VSYNC, INPUT_PULLUP);
}

unsigned char WrCmos7670(unsigned char regID, unsigned char regDat)
{
Wire.beginTransmission(OV7670_ADDRESS); // 设备地址为0x21
Wire.write(regID);
Wire.write(regDat);
Wire.endTransmission(); //结束通信
return(1);
}   

unsigned char rdCmos7670Reg(unsigned char regID)
{
unsigned char regDat;
Wire.beginTransmission(OV7670_ADDRESS); // 设备地址为0x21
Wire.write(regID);
Wire.endTransmission(); //结束通信
Wire.requestFrom(OV7670_ADDRESS, 1);
regDat = Wire.read();
return regDat;
}

unsigned char Cmos7670_init(void)
{
unsigned char mmm;

mmm=0x80;
if(0==WrCmos7670(0x12, mmm))
{
    return 0 ;
}
delay(10);

set_Cmos7670reg();

return 1;
}

void set_Cmos7670reg(void)//OV7670寄存器配置，无逻辑意义，需根据厂家芯片手册了解具体含义
{
WrCmos7670(0x3a,0x04);
WrCmos7670(0x40,0xd0);
WrCmos7670(0x12,0x14);
WrCmos7670(0x32,0x80);
WrCmos7670(0x17,0x16);
WrCmos7670(0x18,0x04);
WrCmos7670(0x19,0x02);
WrCmos7670(0x1a,0x7b);
WrCmos7670(0x03,0x06);
WrCmos7670(0x0c,0x00);
WrCmos7670(0x3e,0x00);
WrCmos7670(0x70,0x3a);
WrCmos7670(0x71,0x35);
WrCmos7670(0x72,0x11);
WrCmos7670(0x73,0x00);
WrCmos7670(0xa2,0x02);
WrCmos7670(0x11,0x81);
WrCmos7670(0x7a,0x20);
WrCmos7670(0x7b,0x1c);
WrCmos7670(0x7c,0x28);
WrCmos7670(0x7d,0x3c);
WrCmos7670(0x7e,0x55);
WrCmos7670(0x7f,0x68);
WrCmos7670(0x80,0x76);
WrCmos7670(0x81,0x80);
WrCmos7670(0x82,0x88);
WrCmos7670(0x83,0x8f);
WrCmos7670(0x84,0x96);
WrCmos7670(0x85,0xa3);
WrCmos7670(0x86,0xaf);
WrCmos7670(0x87,0xc4);
WrCmos7670(0x88,0xd7);
WrCmos7670(0x89,0xe8);
WrCmos7670(0x13,0xe0);
WrCmos7670(0x00,0x00);
WrCmos7670(0x10,0x00);
WrCmos7670(0x0d,0x00);
WrCmos7670(0x14,0x28);
WrCmos7670(0xa5,0x05);
WrCmos7670(0xab,0x07);
WrCmos7670(0x24,0x75);
WrCmos7670(0x25,0x63);
WrCmos7670(0x26,0xA5);
WrCmos7670(0x9f,0x78);
WrCmos7670(0xa0,0x68);
WrCmos7670(0xa1,0x03);
WrCmos7670(0xa6,0xdf);
WrCmos7670(0xa7,0xdf);
WrCmos7670(0xa8,0xf0);
WrCmos7670(0xa9,0x90);
WrCmos7670(0xaa,0x94);
WrCmos7670(0x13,0xe5);
WrCmos7670(0x0e,0x61);
WrCmos7670(0x0f,0x4b);
WrCmos7670(0x16,0x02);
WrCmos7670(0x1e,0x37);
WrCmos7670(0x21,0x02);
WrCmos7670(0x22,0x91);
WrCmos7670(0x29,0x07);
WrCmos7670(0x33,0x0b);
WrCmos7670(0x35,0x0b);
WrCmos7670(0x37,0x1d);
WrCmos7670(0x38,0x71);
WrCmos7670(0x39,0x2a);
WrCmos7670(0x3c,0x78);
WrCmos7670(0x4d,0x40);
WrCmos7670(0x4e,0x20);
WrCmos7670(0x69,0x00);
//WrCmos7670(0x6b,0xe0);//设置PLL倍频,提高运行频率,赋值0x60为30pcs,0xe0为60pcs.
WrCmos7670(0x6b,0x60);//30pcs
WrCmos7670(0x74,0x19);
WrCmos7670(0x8d,0x4f);
WrCmos7670(0x8e,0x00);
WrCmos7670(0x8f,0x00);
WrCmos7670(0x90,0x00);
WrCmos7670(0x91,0x00);
WrCmos7670(0x92,0x00);
WrCmos7670(0x96,0x00);
WrCmos7670(0x9a,0x80);
WrCmos7670(0xb0,0x84);
WrCmos7670(0xb1,0x0c);
WrCmos7670(0xb2,0x0e);
WrCmos7670(0xb3,0x82);
WrCmos7670(0xb8,0x0a);
WrCmos7670(0x43,0x14);
WrCmos7670(0x44,0xf0);
WrCmos7670(0x45,0x34);
WrCmos7670(0x46,0x58);
WrCmos7670(0x47,0x28);
WrCmos7670(0x48,0x3a);
WrCmos7670(0x59,0x88);
WrCmos7670(0x5a,0x88);
WrCmos7670(0x5b,0x44);
WrCmos7670(0x5c,0x67);
WrCmos7670(0x5d,0x49);
WrCmos7670(0x5e,0x0e);
WrCmos7670(0x64,0x04);
WrCmos7670(0x65,0x20);
WrCmos7670(0x66,0x05);
WrCmos7670(0x94,0x04);
WrCmos7670(0x95,0x08);
WrCmos7670(0x6c,0x0a);
WrCmos7670(0x6d,0x55);
WrCmos7670(0x6e,0x11);
WrCmos7670(0x6f,0x9f);
WrCmos7670(0x6a,0x40);
WrCmos7670(0x01,0x40);
WrCmos7670(0x02,0x40);
WrCmos7670(0x13,0xe7);
WrCmos7670(0x15,0x00);//WrCmos7670(0x15,0x00);
WrCmos7670(0x4f,0x80);
WrCmos7670(0x50,0x80);
WrCmos7670(0x51,0x00);
WrCmos7670(0x52,0x22);
WrCmos7670(0x53,0x5e);
WrCmos7670(0x54,0x80);
WrCmos7670(0x58,0x9e);
WrCmos7670(0x41,0x08);
WrCmos7670(0x3f,0x00);
WrCmos7670(0x75,0x05);
WrCmos7670(0x76,0xe1);
WrCmos7670(0x4c,0x00);
WrCmos7670(0x77,0x01);
WrCmos7670(0x3d,0xc2);
WrCmos7670(0x4b,0x09);
WrCmos7670(0xc9,0x60);
WrCmos7670(0x41,0x38);
WrCmos7670(0x56,0x40);
WrCmos7670(0x34,0x11);
WrCmos7670(0x3b,0x02);//WrCmos7670(0x3b,0x02);
WrCmos7670(0xa4,0x89);
WrCmos7670(0x96,0x00);
WrCmos7670(0x97,0x30);
WrCmos7670(0x98,0x20);
WrCmos7670(0x99,0x30);
WrCmos7670(0x9a,0x84);
WrCmos7670(0x9b,0x29);
WrCmos7670(0x9c,0x03);
WrCmos7670(0x9d,0x4c);
WrCmos7670(0x9e,0x3f);
WrCmos7670(0x78,0x04);
WrCmos7670(0x79,0x01);
WrCmos7670(0xc8,0xf0);
WrCmos7670(0x79,0x0f);
WrCmos7670(0xc8,0x00);
WrCmos7670(0x79,0x10);
WrCmos7670(0xc8,0x7e);
WrCmos7670(0x79,0x0a);
WrCmos7670(0xc8,0x80);
WrCmos7670(0x79,0x0b);
WrCmos7670(0xc8,0x01);
WrCmos7670(0x79,0x0c);
WrCmos7670(0xc8,0x0f);
WrCmos7670(0x79,0x0d);
WrCmos7670(0xc8,0x20);
WrCmos7670(0x79,0x09);
WrCmos7670(0xc8,0x80);
WrCmos7670(0x79,0x02);
WrCmos7670(0xc8,0xc0);
WrCmos7670(0x79,0x03);
WrCmos7670(0xc8,0x40);
WrCmos7670(0x79,0x05);
WrCmos7670(0xc8,0x30);
WrCmos7670(0x79,0x26);//WrCmos7670(0x79,0x26);
WrCmos7670(0x09,0x00);
}

void OV7670(void)
{
uint16_t cnt;
detachInterrupt(digitalPinToInterrupt(VSYNC));

Vsync_Flag++;
if(Vsync_Flag==1)   
{
    digitalWrite(FIFO_WRST, HIGH);
    digitalWrite(FIFO_WRST, LOW);
    for(i=0;i<100;i++);
    digitalWrite(FIFO_WRST, HIGH);
    digitalWrite(FIFO_WR, HIGH);   

}
if(Vsync_Flag==2)
{

    digitalWrite(FIFO_WR, LOW);
    detachInterrupt(digitalPinToInterrupt(VSYNC));
    //EXTI->EMR&=~(1<<4);

    //GPIOA->ODR ^= (1 << 3);

    digitalWrite(FIFO_RRST, LOW);
    digitalWrite(FIFO_RCK, LOW);            
    digitalWrite(FIFO_RCK, HIGH);
    digitalWrite(FIFO_RCK, LOW);
    digitalWrite(FIFO_RCK, HIGH);
    digitalWrite(FIFO_RRST, HIGH);

    digitalWrite(FIFO_OE, LOW);
    Serial.write(0x01);
    Serial.write(0xFE);
    for(i = 0; i < 9600; i ++)
   {
      for(j = 0; j < 8; j ++)
      {                  
      digitalWrite(FIFO_RCK, LOW);   
      digitalWrite(FIFO_RCK, HIGH);         
      t1 = ov7670_data();      
      digitalWrite(FIFO_RCK, LOW);         
      digitalWrite(FIFO_RCK, HIGH);         
      t2 = ov7670_data();
      Serial.write(t2);
      Serial.write(t1);                        
      }
    }
    digitalWrite(FIFO_OE, HIGH);      
}
    if(Vsync_Flag >= 2)
    {
      Serial.write(0xFE);
      Serial.write(0x01);
      pinMode(VSYNC, INPUT_PULLUP);
      detachInterrupt(digitalPinToInterrupt(VSYNC));   
      }
   else
   {
      pinMode(VSYNC, INPUT_PULLUP);
      attachInterrupt(digitalPinToInterrupt(VSYNC), OV7670, FALLING);//设置触发中断的端口，中断后运行的程序和触发模式
      }
}

unsigned char ov7670_data(void)
{
    unsigned char tmp;
    unsigned char DATA7 = 0;
    unsigned char DATA6 = 0;
    unsigned char DATA5 = 0;
    unsigned char DATA4 = 0;
    unsigned char DATA3 = 0;
    unsigned char DATA2 = 0;
    unsigned char DATA1 = 0;
    unsigned char DATA0 = 0;
    tmp = 0;

    DATA7 = (unsigned char)digitalRead(D7);
    DATA6 = (unsigned char)digitalRead(D6);
    DATA5 = (unsigned char)digitalRead(D5);
    DATA4 = (unsigned char)digitalRead(D4);
    DATA3 = (unsigned char)digitalRead(D3);
    DATA2 = (unsigned char)digitalRead(D2);
    DATA1 = (unsigned char)digitalRead(D1);
    DATA0 = (unsigned char)digitalRead(D0);
    tmp = (DATA7 << 7) | (DATA6 << 6) | (DATA5 << 5) | (DATA4 << 4)\
         |(DATA3 << 3) | (DATA2 << 2) | (DATA1 << 1) | (DATA0 << 0);

    return tmp;
}

XlinliY.Zhang 发表于 2021-3-26 20:16

你确定这不是数据有问题。。。。。
另外，不建议使用UNO拍这样的照片，和使用这样低效的代码

fan183579 发表于 2021-3-26 20:31

XlinliY.Zhang 发表于 2021-3-26 20:16
你确定这不是数据有问题。。。。。
另外，不建议使用UNO拍这样的照片，和使用这样低效的代码 ...

目前只有uno，代码方面有什么好的建议吗

XlinliY.Zhang 发表于 2021-3-26 22:33

fan183579 发表于 2021-3-26 20:31
目前只有uno，代码方面有什么好的建议吗

寄存器操作

查看完整版本: 使用OV7670(带FIFO)能看清拍的东西，但是画面很难受