Backup of some arduino code to handle OV7670

gistfile1.cpp

#define SIO_C 2
#define SIO_D 4
#define SIO_CLOCK_DELAY 100

void setup()
{
  pinMode(8,OUTPUT);
  
//  while(1)
//  {
//    digitalWrite(8,HIGH);
//    delayMicroseconds(SIO_CLOCK_DELAY);    
//    digitalWrite(8,LOW);
//    delayMicroseconds(SIO_CLOCK_DELAY);    
//  }
    
  Serial.begin(9600);
  Serial.println("Start InitOV7670 test program");
  digitalWrite(8,HIGH);delayMicroseconds(SIO_CLOCK_DELAY);   
  digitalWrite(8,LOW);delayMicroseconds(SIO_CLOCK_DELAY);   
  digitalWrite(8,HIGH);delayMicroseconds(SIO_CLOCK_DELAY);   

  if(InitOV7670())    
    Serial.println("InitOV7670 OK");
  else
    Serial.println("InitOV7670 NG");
  
  
}

void loop()
{
}


void InitSCCB(void) //SCCB初期化
{
  pinMode(SIO_C,OUTPUT);
  pinMode(SIO_D,OUTPUT);
  digitalWrite(SIO_C,HIGH);
  digitalWrite(SIO_D,HIGH);
  Serial.println("InitSCCB - PortDirectionSet & Set High OK");
}

void StartSCCB(void) //SCCBスタート
{
  Serial.println("StartSCCB");

  digitalWrite(SIO_D,HIGH);
  delayMicroseconds(SIO_CLOCK_DELAY);
  digitalWrite(SIO_C,HIGH);
  delayMicroseconds(SIO_CLOCK_DELAY);
  digitalWrite(SIO_D,LOW);
  delayMicroseconds(SIO_CLOCK_DELAY);
  digitalWrite(SIO_C,LOW);
  delayMicroseconds(SIO_CLOCK_DELAY);
}

void StopSCCB(void) //SCCBストップ
{
  //Serial.println("StopSCCB");

  digitalWrite(SIO_D,LOW);
  delayMicroseconds(SIO_CLOCK_DELAY);
  digitalWrite(SIO_C,HIGH);
  delayMicroseconds(SIO_CLOCK_DELAY);
  digitalWrite(SIO_D,HIGH);
  delayMicroseconds(SIO_CLOCK_DELAY);
}

char SCCBWrite(byte m_data)
{
  unsigned char j,tem;
  
  //Serial.print("SCCBWrite 0x");
  //Serial.println(m_data,HEX);

  //Serial.print("SCCBWrite");
  for(j=0;j<8;j++) //循环8次发送数据
  {
    if((m_data<<j)&0x80)
    {
      digitalWrite(SIO_D,HIGH);
    }
    else
    {
      digitalWrite(SIO_D,LOW);
    }
    delayMicroseconds(SIO_CLOCK_DELAY);
    digitalWrite(SIO_C,HIGH);
    delayMicroseconds(SIO_CLOCK_DELAY);
    digitalWrite(SIO_C,LOW);
    delayMicroseconds(SIO_CLOCK_DELAY);
  }

  //Serial.println("");
  //delayMicroseconds(SIO_CLOCK_DELAY);
  digitalWrite(8,LOW); //debug
  pinMode(SIO_D,INPUT); //SIO_Dのバスをスレーブ(OV7670)に渡す
  digitalWrite(SIO_D,LOW); //プルアップ防止
  delayMicroseconds(SIO_CLOCK_DELAY);

  digitalWrite(8,HIGH); //debug
  digitalWrite(SIO_C,HIGH);
  delayMicroseconds(SIO_CLOCK_DELAY);

  //Serial.println(" Write done");
  digitalWrite(8,LOW); //debug
  if(digitalRead(SIO_D)==HIGH)
  {
    //SIO_D=Hなら失敗
    tem=0;
    Serial.println("SCCBWrite NG");
  }
  else
  {
    //SIO_D=Lなら成功
    tem=1; 
    //Serial.println("SCCBWrite OK");
  }
  digitalWrite(SIO_C,LOW);
  delayMicroseconds(SIO_CLOCK_DELAY);	
  pinMode(SIO_D,OUTPUT); //SIO_Dのバスをマスター(Arduino)に戻す
  //delayMicroseconds(SIO_CLOCK_DELAY);	
  //digitalWrite(SIO_D,LOW);
  //delayMicroseconds(SIO_CLOCK_DELAY);	

  //pinMode(SIO_C,OUTPUT); //SIO_Cのバスをマスター(Arduino)に戻す

  return tem;  
}

int InitOV7670(void)
{
  char temp;
  int i=0;

  InitSCCB();

  temp=0x80;
  if(WriteOV7670(0x12, temp)==0) //Reset SCCB
  {
    Serial.println("Resetting SCCB NG");
    return 0 ;
  }
  //Serial.println("Resetting SCCB OK");
  //delayMicroseconds(10);

//  for(i=0;i<CHANGE_REG_NUM;i++)
//  {
//    if( 0==wrOV7670Reg(pgm_read_byte( &change_reg[i][0]),pgm_read_byte( &change_reg[i][1]) ))
//    {
//      return 0;
//    }
//  }

  return 0x01; //ok
}  

////////////////////////////
//機能：OV7660レジスタに書き込む
//返値：成功=1 失敗=0
int WriteOV7670(char regID, char regDat)
{
	StartSCCB();
	if(SCCBWrite(0x42)==0)
	{
                Serial.println(" Write Error 0x42");
  		StopSCCB();
		return(0);
	}
	delayMicroseconds(SIO_CLOCK_DELAY);
  	if(SCCBWrite(regID)==0)
	{
		StopSCCB();
		return(0);
	}
	delayMicroseconds(SIO_CLOCK_DELAY);
  	if(SCCBWrite(regDat)==0)
	{
		StopSCCB();
		return(0);
	}
  	StopSCCB();
	
  	return(1);
}

hello,

I would use your code because i find it good, but i have a electronical problem..
Please can you give me a diagram of the electrical system required.

thanks.
Ne0ratek

What voltages are you guys using on the Arduino? The OV7670 IO voltages are rated at 3V max (uno,nano etc). In my opinion this will only work on a Due Arduino because the avr is just way too slow.

Can you give me a full code about interface between ov7670 and Uno R3 or Mega2560. (and wiring circuit please) Thanks!

Can you give me a full code about interface between ov7670
. (and wiring circuit please) Thanks!

hello all, can you help me on OV7670 camera interface with Arduino?

hi i dont know a bout interface ov7670 and arduino uno? mail: [email protected]

TekuConcept, could you tell me how you did it?