/**
* @brief Write data to specific register in Camera Module OV7670
* @param Address: address of register
* Value: value of data to be written into register
* @retval ERROR, SUCCESS
*/
ErrorStatus Camera_WriteReg(uint8_t Address, uint8_t Value)
{
// Create start condition on SCCB/I2C interface
SCCB_Start();
// Write data (Address of slave device for Write) on SCCB/I2C interface
if((SCCB_Write(WriteAddress)) == Error)
{
SCCB_Stop(); // Create stop condition on SCCB/I2C interface
return(ERROR); // Return error and cancel the communication
}
Delay_us(100);
// Write data (Address of register in Camera Module)on SCCB/I2C interface
if((SCCB_Write(Address)) == Error)
{
SCCB_Stop(); // Create stop condition on SCCB/I2C interface
return(ERROR); // Return error and cancel the communication
}
// Write data (Data to write into register in Camera Module)on SCCB/I2C interface
if((SCCB_Write(Value)) == Error)
{
SCCB_Stop(); // Create stop condition on SCCB/I2C interface
return(ERROR); // Return error and cancel the communication
}
// Create stop condition on SCCB/I2C interface
SCCB_Stop();
return(SUCCESS);
}
void SCCB_Bytewrite(unsigned char device,unsigned char address,unsigned char data)
{
unsigned char i;
unsigned char ack;
for(i=0;i<20;i++)
{
SCCB_Start();
ack=SCCB_Sendbyte(device);
if(ack)
{
SCCB_Stop();
continue;
}
ack=SCCB_Sendbyte(address);
if(ack)
{
SCCB_Stop();
continue;
}
ack=SCCB_Sendbyte(data);
if(ack)
{
SCCB_Stop();
continue;
}
SCCB_Stop();
if(ack==0) break;
}
}
//读OV7660寄存器
u8 OV_ReadReg(u8 regID, u8 *regDat)
{
//通过写操作设置寄存器地址
SCCB_Start();
if(SCCB_Write(0x42))//写地址
{
SCCB_Stop();//发送SCCB 总线停止传输命令
return 1;//错误返回
}
delay_us(10);
if(SCCB_Write(regID))//积存器ID
{
SCCB_Stop();//发送SCCB 总线停止传输命令
return 2;//错误返回
}
SCCB_Stop();//发送SCCB 总线停止传输命令
delay_us(10);
//设置寄存器地址后，才是读
SCCB_Start();
if(SCCB_Write(0x43))//读地址
{
SCCB_Stop();//发送SCCB 总线停止传输命令
return 3;//错误返回
}
delay_us(10);
*regDat=SCCB_Read();//返回读到的值
noAck();//发送NACK命令
SCCB_Stop();//发送SCCB 总线停止传输命令
return 0;//成功返回
}
/**
* @brief Read data form specific register in Camera Module OV7670
* @param Address: address of register in Camera Module
* @retval ReturnState.Data -> Return read data from register
* ReturnState.State -> Return state of the transmission
*/
ReturnState *Camera_ReadReg(uint8_t Address)
{
ReturnState returnState;
// Structure for return Data and State (Success/Error)
returnState.Data = 0x00;
returnState.State = ERROR;
// Create start condition on SCCB/I2C interface
SCCB_Start();
// Write data (Address of slave device for Write) on SCCB/I2C interface
if(Error == (SCCB_Write(WriteAddress)))
{
SCCB_Stop(); // Create stop condition on SCCB/I2C interface
return(&returnState); // Return error and cancel the communication
}
Delay_us(100);
// Write data (Address of register in Camera Module)on SCCB/I2C interface
if(Error == (SCCB_Write(Address)))
{
SCCB_Stop(); // Create stop condition on SCCB/I2C interface
return(&returnState); // Return error and cancel the communication
}
// Create stop condition on SCCB/I2C interface
SCCB_Stop();
// Delay for SCCB/I2C
Delay_us(100);
// Create start condition on SCCB/I2C interface
SCCB_Start();
// Write data (Address of slave device for Read) on SCCB/I2C interface
if(Error == (SCCB_Write(ReadAddress)))
{
SCCB_Stop(); // Create stop condition on SCCB/I2C interface
return(&returnState); // Return error and cancel the communication
}
Delay_us(500);
// Received data from Camera Module (SCCB/I2C)
returnState.Data = SCCB_Read();
// No acknowlage on SCCB/I2C interface
NoAck();
// Create stop condition on SCCB/I2C interface
SCCB_Stop();
// If everything is done correct return success
returnState.State = SUCCESS;
return(&returnState);
}
int SCCB_ReadByte_one(uint8 *pBuffer, uint16 length, uint8 ReadAddress)
{
if(!SCCB_Start())
{
return 0;
}
SCCB_SendByte( DEV_ADR ); /* 器件地址 */
if( !SCCB_WaitAck() )
{
SCCB_Stop();
return 0;
}
SCCB_SendByte( ReadAddress ); /* 设置低起始地址 */
SCCB_WaitAck();
SCCB_Stop();
if(!SCCB_Start())
{
return 0;
}
SCCB_SendByte( DEV_ADR + 1 ); /* 器件地址 */
if(!SCCB_WaitAck())
{
SCCB_Stop();
return 0;
}
while(length)
{
*pBuffer = SCCB_ReceiveByte();
if(length == 1)
{
SCCB_NoAck();
}
else
{
SCCB_Ack();
}
pBuffer++;
length--;
}
SCCB_Stop();
return 1;
}
int SCCB_WriteByte_one( uint16 WriteAddress , uint8 SendByte )
{
if(!SCCB_Start())
{
return 0;
}
SCCB_SendByte( DEV_ADR ); /* 器件地址 */
if( !SCCB_WaitAck() )
{
SCCB_Stop();
return 0;
}
SCCB_SendByte((uint8)(WriteAddress & 0x00FF)); /* 设置低起始地址 */
SCCB_WaitAck();
SCCB_SendByte(SendByte);
SCCB_WaitAck();
SCCB_Stop();
return 1;
}
/* 函数名：SCCB_WriteByte
* 描述 ：写一字节数据
* 输入 ：- WriteAddress: 待写入地址 - SendByte: 待写入数据 - DeviceAddress: 器件类型
* 输出 ：返回为:=1成功写入,=0失败
* 注意 ：无 */
int SCCB_WriteByte( uint16_t WriteAddress , uint8_t SendByte )
{
if(!SCCB_Start())
{
return DISABLE;
}
SCCB_SendByte( DEV_ADR ); /* 器件地址 */
if( !SCCB_WaitAck() )
{
SCCB_Stop();
return DISABLE;
}
SCCB_SendByte((uint8_t)(WriteAddress & 0x00FF)); /* 设置低起始地址 */
SCCB_WaitAck();
SCCB_SendByte(SendByte);
SCCB_WaitAck();
SCCB_Stop();
return ENABLE;
}
//写OV7670寄存器
u8 OV_WriteReg(u8 regID, u8 regDat)
{
SCCB_Start();//发送SCCB 总线开始传输命令
if(SCCB_Write(0x42))//写地址
{
SCCB_Stop();//发送SCCB 总线停止传输命令
return 1;//错误返回
}
delay_us(10);
if(SCCB_Write(regID))//寄存器ID
{
SCCB_Stop();//发送SCCB 总线停止传输命令
return 2;//错误返回
}
delay_us(10);
if(SCCB_Write(regDat))//写数据到积存器
{
SCCB_Stop();//发送SCCB 总线停止传输命令
return 3;//错误返回
}
SCCB_Stop();//发送SCCB 总线停止传输命令
return 0;//成功返回
}
