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OV7670 + ARDUINO
#define SIO_C 2
#define SIO_D 4
#define SIO_CLKDELAY 100
void setup (void)
{
Serial.begin(9600);
if(InitOV7670())
Serial.println("Init OV7670 : OK");
else
Serial.println("Init OV7670 : NG....");
}
void loop( void)
{
Serial.println("Writing test :");
byte data = 0x84;
Serial.println(data);
if(WriteOV7670(0x12, data))
Serial.println("Writing : OK");
else
Serial.println("Writing : NG...");
/*--------------------------*/
Serial.println("\n Reading test :");
char rdata = 0x20;
char ip = 0x43;
if(ReadOV7670(0x0A, &rdata, ip))
{
Serial.println("Reading : OK ");
}
else
Serial.println("Reading : NG...");
Serial.println(rdata, HEX);
if(rdata == 0x76)
Serial.println("youpi");
/*-----------------------------*/
int temp = 3600;
delay(temp*1000);
}
void InitSCCB(void)
{
pinMode(SIO_C, OUTPUT);
pinMode(SIO_D, OUTPUT);
digitalWrite(SIO_C, HIGH);
digitalWrite(SIO_D, HIGH);
Serial.println("InitSCCB - Port Direction and set high.");
}
void StartSCCB(void)
{
Serial.println("Starting SCCB...");
/*put HIGH in order to avoid propagating unknown bus state.*/
digitalWrite(SIO_D, HIGH);
delayMicroseconds(SIO_CLKDELAY);
digitalWrite(SIO_C, HIGH);
delayMicroseconds(SIO_CLKDELAY);
digitalWrite(SIO_D, LOW);
delayMicroseconds(SIO_CLKDELAY);
digitalWrite(SIO_C, LOW);
Serial.println("Starting SCCB : done.");
}
void StopSCCB(void)
{
Serial.println("Stoping SCCB...");
digitalWrite(SIO_D,LOW);
delayMicroseconds(SIO_CLKDELAY);
digitalWrite(SIO_C,HIGH);
delayMicroseconds(SIO_CLKDELAY);
digitalWrite(SIO_D,HIGH);
delayMicroseconds(SIO_CLKDELAY);
Serial.println("Stoping SCCB : done.");
}
char WriteSCCB( byte m_data)
{
unsigned char j, tem;
for(j=0;j<8;j++)
{
/*write the MSB not written yet :*/
if((m_data<<j)&0x80)
{
digitalWrite(SIO_D, HIGH);
}
else
{
digitalWrite(SIO_D, LOW);
}
delayMicroseconds(SIO_CLKDELAY);
digitalWrite(SIO_C, HIGH);
delayMicroseconds(SIO_CLKDELAY);
digitalWrite(SIO_C, LOW);
delayMicroseconds(SIO_CLKDELAY);
}
/*eight bits have been send, let's deal with the ninth Don't-care one*/
/*we put the SIO_D pin at low in order to avoid propagating any unknown state.*/
/*why input ? because it enables a high impedance, I suppose...?*/
pinMode(SIO_D, INPUT);
digitalWrite(SIO_D, LOW);
delayMicroseconds(SIO_CLKDELAY);
digitalWrite(SIO_C, HIGH);
delayMicroseconds(SIO_CLKDELAY);
/*there is something to read to check the transmission :*/
if(digitalRead(SIO_D)==HIGH)
{
Serial.println("SCCB Write NG");
tem = 0;
}
else
{
tem = 1;
Serial.println("SCCB Write : OK.");
}
digitalWrite(SIO_C, LOW);
delayMicroseconds(SIO_CLKDELAY);
/*let's clean that up :*/
pinMode(SIO_D, OUTPUT);
return tem;
}
char ReadSCCB( char* m_data)
{
unsigned char j, tem = 1;
/*we have to return tem but there is no way to assert that something/nothing happend apparently ?...*/
/*Let's make things readable :*/
//pinMode(SIO_D, INPUT);
digitalWrite(SIO_D, LOW);
/*Hi-Z*//*TEST*/
for(j=0;j<8;j++)
{
delayMicroseconds(SIO_CLKDELAY);
digitalWrite(SIO_C, HIGH);
/*let's read in the middle of the SIO_C cycle :*/
/*read the MSB not read yet :*/
if(digitalRead(SIO_D) != LOW)
{
*m_data = 0x01 | (*m_data << 1);
}
else
{
*m_data = 0xFE & (*m_data << 1) ;
}
delayMicroseconds(SIO_CLKDELAY);
digitalWrite(SIO_C, LOW);
delayMicroseconds(SIO_CLKDELAY);
}
/*eight bits have been read, let's deal with the ninth Don't-care one*/
/*the master is responsible for driver SIO_D at logical 1 during the NA bit.*/
pinMode(SIO_D, OUTPUT);
digitalWrite(SIO_D, HIGH);
delayMicroseconds(SIO_CLKDELAY);
digitalWrite(SIO_C, HIGH);
delayMicroseconds(SIO_CLKDELAY);
/*there is something/nothing to read to check the transmission ???*/
digitalWrite(SIO_C, LOW);
delayMicroseconds(SIO_CLKDELAY);
/*let's clean that up : reset as usual as if we had written...*/
pinMode(SIO_D, OUTPUT);
digitalWrite(SIO_D, LOW);
return tem;
}
int WriteOV7670(char regID, char regData)
{
StartSCCB();
/*let's indicate that we want to write :*/
if(WriteSCCB(0x42) == 0)
{
Serial.println("Problem : 3phase Write Error 0x42 phase 1.");
StopSCCB();
return(0);
}
delayMicroseconds(SIO_CLKDELAY);
/*phase 2 : sub address*/
if(WriteSCCB(regID) == 0)
{
Serial.println("Problem : 3phase Write Error phase 2.");
StopSCCB();
return(0);
}
delayMicroseconds(SIO_CLKDELAY);
/*phase 3 : data writing*/
if(WriteSCCB(regData) == 0)
{
Serial.println("Problem : 3phase Write Error phase 3.");
StopSCCB();
return(0);
}
/*exiting*/
StopSCCB();
return(1);
}
int ReadOV7670(char regID, char* regData, char ip)
{
StartSCCB();
/*2-phase write transmission cycle */
/*---------------------------------*/
/*let's indicate that we want to write :*/
if(WriteSCCB(0x42) == 0)
{
Serial.println("Problem : 2phase Write Error 0x42 phase 1-1.");
StopSCCB();
return(0);
}
delayMicroseconds(SIO_CLKDELAY);
/*phase 2 : sub-address*/
if(WriteSCCB(regID) == 0)
{
Serial.println("Problem : 2phase Write Error phase 1-2.");
StopSCCB();
return(0);
}
delayMicroseconds(SIO_CLKDELAY);
/*---------------------------------*/
/*2-phase read transmission cycle*/
/*phase 1 : ID address*/
if(WriteSCCB(ip) == 0)/*test 0x21 instead of 0x43*/
{
Serial.println("Problem : 2phase Read Error phase 2-1.");
StopSCCB();
return(0);
}
delayMicroseconds(SIO_CLKDELAY);
/*phase 2 : data reading*/
if(ReadSCCB(regData) == 0)
{
Serial.println("Problem : 2phase Read Error phase 2-2.");
StopSCCB();
return(0);
}
/*exiting*/
StopSCCB();
return(1);
}
int InitOV7670(void)
{
char temp;
int i = 0;
InitSCCB();
temp = 0x80;
/*let's reset the SCCB ! */
if( WriteOV7670( 0x12, temp) == 0)
{
Serial.println("Problem : Resetting SCCB NG.");
return(0);
}
/*-------------*/
/*settings : */
/*-------------*/
return(0x01);
}
@Thomas-DaxBrin

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@Thomas-DaxBrin Thomas-DaxBrin commented Nov 2, 2014

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

thank.
Ne0ratek

@SonJY

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@SonJY SonJY commented Apr 29, 2015

I ov7670 used without a library?

@achindra

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@achindra achindra commented May 1, 2015

Can you please share Uno-Ov7670 circuit diagram?
I tried, based on another post and it throws me following output

InitSCCB - Port Direction and set high.
Starting SCCB...
Starting SCCB : done.
SCCB Write : OK.
SCCB Write : OK.
SCCB Write : OK.
Stoping SCCB...
Stoping SCCB : done.
Init OV7670 : OK
Writing test :
132
Starting SCCB...
Starting SCCB : done.
SCCB Write : OK.
SCCB Write : OK.
SCCB Write : OK.
Stoping SCCB...
Stoping SCCB : done.
Writing : OK

Reading test :
Starting SCCB...
Starting SCCB : done.
SCCB Write : OK.
SCCB Write : OK.
SCCB Write NG
Problem : 2phase Read Error phase 2-1.
Stoping SCCB...
Stoping SCCB : done.
Reading : NG...
20

What does it mean by 2phase Read Error phase 2-1?

Also, in this code you are testing camera setup. Have you tried reading image from camera and streaming bytes to user over serial?

@gazaliqwerty1

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@gazaliqwerty1 gazaliqwerty1 commented Jun 3, 2015

I need scematic master !

@Abrahamlein

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@Abrahamlein Abrahamlein commented Jun 3, 2015

In order to solve the "Problem: 2phase Read Error phase 2-1" you need to drive a clock signal to the XCLK of the camera module. I did it by fusing the CKOUT of my AVR.

@kimonov

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@kimonov kimonov commented Sep 26, 2015

hello
don't forget to uncomment line 181 to get good results
good luck

@Rzaandroid

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@Rzaandroid Rzaandroid commented Jan 28, 2016

Hi I'm having a lot of difficulty getting the ov7670 working I've got to Problem : 2phase Read Error phase 2-1. How do I set the xclck fuse and how do I output the image please help

@houssembelkacem

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@houssembelkacem houssembelkacem commented Apr 3, 2016

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

@matrix866

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@matrix866 matrix866 commented Jun 8, 2016

This is working for me with a FIFO OV7670 on arduino uno connection the camera SIOC and SIOD to pin D2 and D4.
ashampoo_snap_2016 06 08_15h40m52s_001_

But now that this seems to work how do I get a picture? xD

@sandiprupnavar7979

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@sandiprupnavar7979 sandiprupnavar7979 commented Mar 9, 2019

can anyone provide connection diagram??

@316248269

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@316248269 316248269 commented May 27, 2019

This is working for me with a FIFO OV7670 on arduino uno connection the camera SIOC and SIOD to pin D2 and D4.
ashampoo_snap_2016 06 08_15h40m52s_001_

But now that this seems to work how do I get a picture? xD

Hi:
Do you solve it?

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