📄 sccb.c
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// OmniVision Serial Camera Control Bus (SCCB) Functional File.
//低电平持续时间 最少1，3ns ------CLK
//高电平持续时间最少为 O。6ns -----CLK
#include <Reg52.h>
#include <Intrins.h>
#include<stdio.h>
sbit p32=P3^2;
sbit SIO_C=P1^1;
sbit SIO_D=P1^0;
sbit IO= P1^2;
//sbit SIO_D=P1^2;
//chip slave ID is 0X42(for write) and 0X43(for read)
#define OV7620_ID 0x42
void serial_init(void) //改变你需要的位即可！
{
//串口初始化，晶振11.0592Hz，波特率9600
SCON = 0x50; // Setup serial port control register
// Mode 1: 8-bit uart var. baud rate
// REN: enable receiver
PCON &= 0x7F; // Clear SMOD bit in power ctrl reg
// This bit doubles the baud rate
TMOD &= 0xCF; // Setup timer/counter mode register
// Clear M1 and M0 for timer 1
TMOD |= 0x20; //Set M1 for 8-bit autoreload timer
TH1 = 0xFD; // Set autoreload value for timer 1
// 9600 baud with 11.0592 MHz xtal
TR1 = 1; // Start timer 1 ->TCON
TI = 1; // Set TI to indicate ready to xmit.
ES=1;
EA=1;
}
void delay()
{
unsigned char i,j,k;
for(i=0;i<10;i++)
{
for(j=0;j<20;j++)
{
for(k=0;k<248;k++);
}
}
}
void nops(void) //36us
{
//_nop_();
//_nop_();
//_nop_();
// _nop_();
//_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
}
void hnops(void)
{
//_nop_();
//_nop_();
//_nop_();
_nop_();
_nop_();
}
void OV7620_SCCB_START(void)
{
SIO_C=1;
nops();
SIO_D=1;
nops();
SIO_D=0;
nops();
SIO_C=0;
nops();
}
void OV7620_SCCB_END(void)
{
//SIO_C=1;
//nops();
SIO_D=0;
nops();
// SIO_D=1;
// nops();
SIO_C=1;
nops();
SIO_D=1;
}
bit OV7620_SCCB_Readbit(void )
{
bit temp=0;
nops();
SIO_C=1;
//input
nops();
if(SIO_D)
temp =1;
nops();
SIO_C=0;
nops();
// SBUF=temp;
// delay();
return temp;
}
void OV7620_SCCB_Writebit(bit a)
{
nops();
SIO_D=a;
nops();
nops();
SIO_C=1;
nops();
SIO_C=0;
nops();
}
void OV7620_SCCB_Writechar(unsigned char b)
{
int i = 0;
SBUF=b;
delay();
/* data */
for (i = 0; i < 8; i++ ) {
OV7620_SCCB_Writebit(b & 0x80);
b <<= 1;
}
/* 9th bit - Don't care */
OV7620_SCCB_Writebit(1);
nops();
nops();
}
unsigned char V7620_SCCB_Readchar( void)
{
char i;
unsigned char tmp = 0;
unsigned char val;
bit l=0;
SIO_D=1;
nops();
nops();
for (i = 7; i >= 0; i--) //0-255 溢出 没有报错
{
l= OV7620_SCCB_Readbit();
tmp<<=1;
if(l)
{//tmp = tmp | (1<<i);
tmp=tmp | 0x01;
}
}
nops();
/* 9th bit - N.A. */
OV7620_SCCB_Writebit(1);
nops();
nops();
val = tmp & 0xff;
return val;
}
unsigned char OV7620_Read_SCCB_CMOS(unsigned char DeviceAddress,unsigned char RegisterAddress)
{
unsigned char val=0;
// SBUF=DeviceAddress;
// delay();
// SBUF=RegisterAddress;
// delay();
/* 2-phase write */
OV7620_SCCB_START(); //Start
OV7620_SCCB_Writechar(DeviceAddress);
OV7620_SCCB_Writechar(RegisterAddress);
OV7620_SCCB_END(); //stop
nops();
nops();
/* 2-phase read */
OV7620_SCCB_START(); //Start
OV7620_SCCB_Writechar(DeviceAddress | 0X01);
val=V7620_SCCB_Readchar();
OV7620_SCCB_END(); //stop
return val;
}
void OV7620_Write_SCCB_COMS(unsigned char DeviceAddress,unsigned char RegisterAddress, unsigned char Write_Data)
{
/* 3-phase write */
OV7620_SCCB_START(); //Start
OV7620_SCCB_Writechar(DeviceAddress);
OV7620_SCCB_Writechar(RegisterAddress);
OV7620_SCCB_Writechar( Write_Data);
OV7620_SCCB_END(); //stop
}
//相当于一个二相写和一个二相读操作
unsigned char Read_CMOS(unsigned char DeviceAddress,unsigned char RegisterAddress)
{
unsigned char bdata Buffer_Data;
bit Buffer_Data0=Buffer_Data^0;
bit Buffer_Data1=Buffer_Data^1;
bit Buffer_Data2=Buffer_Data^2;
bit Buffer_Data3=Buffer_Data^3;
bit Buffer_Data4=Buffer_Data^4;
bit Buffer_Data5=Buffer_Data^5;
bit Buffer_Data6=Buffer_Data^6;
bit Buffer_Data7=Buffer_Data^7;
Buffer_Data= 0x42;
//printf("write data to register 0x 1c is %x\n",Buffer_Data);
F0=0;
//SIO_E=0;
//nops();
OV7620_SCCB_START(); //Start
SIO_D=Buffer_Data7;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit7
SIO_D=Buffer_Data6;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit6
SIO_D=Buffer_Data5;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit5
SIO_D=Buffer_Data4;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit4
SIO_D=Buffer_Data3;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit3
SIO_D=Buffer_Data2;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit2
SIO_D=Buffer_Data1;
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit1
SIO_D=Buffer_Data0;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit0
SIO_D=1; // don't care 1
nops();
nops();
nops();
SIO_C=1;
nops();
SIO_C=0;
nops();
// printf("send DeviceAddress success\n");
Buffer_Data=RegisterAddress;
//printf("write data to register 0x 1c is %x\n",Buffer_Data);
SIO_D=0;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit7
SIO_D=0;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit6
SIO_D=0;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit5
SIO_D=1;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit4
SIO_D=1;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit3
SIO_D=1;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit2
SIO_D=0;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit1
SIO_D=1;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit0
SIO_D=1; // don't care 0
nops();
nops();
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //check Ack don't care 1
// printf("send RegisterAddress success\n");
OV7620_SCCB_END(); //stop
nops();
nops();
nops();
nops();
OV7620_SCCB_START(); //Start
Buffer_Data=0X43; // 0x43
// printf("write data to register 0x 1c is %x\n",Buffer_Data);
SIO_D=0;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit7
SIO_D=1;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit6
SIO_D=0;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit5
SIO_D=0;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit4
SIO_D=0;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit3
SIO_D=0;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit2
SIO_D=1;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit1
SIO_D=1;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit0
SIO_D=1; //on't care 1
nops();
nops();
nops();
SIO_C=1;
nops();
SIO_D=1; //INPUT
SIO_C=0;
nops();
// printf("send DeviceAddress success\n");
// printf("read data\n");
//read data
Buffer_Data=0x00;
nops();
SIO_C=1;
//input
nops();
if(SIO_D)
Buffer_Data|=0x80;
nops();
//SIO_D=1; //INPUT
SIO_C=0;
nops(); //bit7
SIO_C=1;
nops();
if(SIO_D)
Buffer_Data|=0x40;
nops();
SIO_C=0;
nops(); //bit6
SIO_C=1;
nops();
if(SIO_D)
Buffer_Data|=0x20;
nops();
//SIO_D=1; //INPUT
SIO_C=0;
nops(); //bit5
SIO_C=1;
nops();
if(SIO_D)
Buffer_Data|=0x10;
nops();
// SIO_D=1; //INPUT
SIO_C=0;
nops(); //bit4
SIO_C=1;
nops();
if(SIO_D)
Buffer_Data|=0x08;
nops();
//SIO_D=1; //INPUT
SIO_C=0;
nops(); //bit3
SIO_C=1;
nops();
if(SIO_D)
Buffer_Data|=0x04;
nops();
//SIO_D=1; //INPUT
SIO_C=0;
nops(); //bit2
SIO_C=1;
nops();
if(SIO_D)
Buffer_Data|=0x02;
nops();
//SIO_D=1; //INPUT
SIO_C=0;
nops(); //bit1
SIO_C=1;
nops();
if(SIO_D)
Buffer_Data|=0x01;
nops();
SIO_C=0;
nops(); //bit0
SIO_D=1; // 低电平应答信号？？？？？？还是高电平？？？？？？
nops();
SIO_C=1;
nops();
if(SIO_D)
{
if(SIO_D)
F0=1;
}
else
{
nops();
// printf("NA IS O \n");
// printf("read data failed\n");
}
SIO_C=0;
nops(); //check Ack NA BIT MUST BE 1
//SIO_C=1;
//nops();
SIO_D=0;
nops();
//SIO_D=1;
//nops();
SIO_C=1;
nops();
SIO_D=1; //stop
// printf("read data success\n");
// printf("read data from register 0x 1c is %x\n",Buffer_Data);
return Buffer_Data;
}
bit Write_COMS(unsigned char DeviceAddress,unsigned char RegisterAddress, unsigned char Write_Data)
{
ACC=DeviceAddress;
F0=0;
//SIO_E=0;
//nops();
SIO_C=1;
nops();
SIO_D=1;
nops();
SIO_D=0;
nops();
SIO_C=0;
nops(); //Start
SIO_D=ACC^7;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit7
SIO_D=ACC^6;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit6
SIO_D=ACC^5;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit5
SIO_D=ACC^4;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit4
SIO_D=ACC^3;
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit3
SIO_D=ACC^2;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit2
SIO_D=ACC^1;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit1
SIO_D=ACC^0;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit0
SIO_D=1;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //check Ack don't care
printf("send DeviceAddress success\n");
ACC=RegisterAddress;
SIO_D=ACC^7;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit7
SIO_D=ACC^6;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit6
SIO_D=ACC^5;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit5
SIO_D=ACC^4;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit4
SIO_D=ACC^3;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit3
SIO_D=ACC^2;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit2
SIO_D=ACC^1;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit1
SIO_D=ACC^0;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit0
SIO_D=1;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //check Ack don't care
printf("send RegisterAddress success\n");
printf("write data\n");
ACC=Write_Data;
SIO_D=ACC^7;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit7
SIO_D=ACC^6;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit6
SIO_D=ACC^5;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit5
SIO_D=ACC^4;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit4
SIO_D=ACC^3;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit3
SIO_D=ACC^2;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit2
SIO_D=ACC^1;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit1
SIO_D=ACC^0;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //bit0
SIO_D=1;
nops();
SIO_C=1;
nops();
SIO_C=0;
nops(); //check Ack dont't care 0
printf("write data success\n ");
//SIO_C=1;
// nops();
SIO_D=0;
nops();
//SIO_D=1;
//nops();
SIO_C=1;
nops();
SIO_D=1; //stop
return F0;
}
void main()
{
unsigned char temp;
//bit ack;
serial_init();
//ack= Write_COMS(OV7620_write,0x13,0x31);//8位数据格式,CCIR656格式
//ack= Write_COMS(OV7620_write,0x28,0x20); //逐行扫描模式
//ack= Write_COMS(OV7620_write,0x67,0x9a); //CCIR 601 YCrCb
//ack= Write_COMS(OV7620_write,0x13,0x31); //
//ack= Write_COMS(OV7620_write,0x13,0x31); //
while(1)
{
if(p32==0) //按键消抖动
{
delay();
if(p32==0)
{
while(p32==0);
temp=OV7620_Read_SCCB_CMOS(OV7620_ID,0x11);
OV7620_Write_SCCB_COMS(OV7620_ID,0x11,0x00);
temp=OV7620_Read_SCCB_CMOS(OV7620_ID,0x11);
SBUF=temp;
delay();
OV7620_Write_SCCB_COMS(OV7620_ID,0x70,0x81);
temp=OV7620_Read_SCCB_CMOS(OV7620_ID,0x70);
SBUF=temp;
delay();
OV7620_Write_SCCB_COMS(OV7620_ID,0x13,0x31);
temp=OV7620_Read_SCCB_CMOS(OV7620_ID,0x13);
SBUF=temp;
delay();
OV7620_Write_SCCB_COMS(OV7620_ID,0x28,0x20);
temp=OV7620_Read_SCCB_CMOS(OV7620_ID,0x28);
SBUF=temp;
delay();
OV7620_Write_SCCB_COMS(OV7620_ID,0x67,0x1a);
temp=OV7620_Read_SCCB_CMOS(OV7620_ID,0x67);
SBUF=temp;
delay();
// OV7620_Write_SCCB_COMS(OV7620_ID,0x11,0x31);
// temp=OV7620_Read_SCCB_CMOS(OV7620_ID,0x11);
// SBUF=temp;
// delay();
//SBUF=temp;
//delay();
OV7620_Write_SCCB_COMS(OV7620_ID,0x12,0x24); //8 BIT DATAOUT
temp=OV7620_Read_SCCB_CMOS(OV7620_ID,0x12);
SBUF=temp;
delay();
// temp=OV7620_Read_SCCB_CMOS(OV7620_ID,0x13);
// SBUF=temp;
// delay();
//
}
};
//printf("read data from register 0x 1d is %d\n",temp);
};
}⌨️ 快捷键说明
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