#define I2C_Speed        100000
#define I2C_EE             I2C1



#define uStatus		0x80
#define	dTime 5


#define I2C_EE_GPIO		   GPIOB
#define I2C_EE_SCL         GPIO_Pin_5
#define I2C_EE_SDA         GPIO_Pin_4
#define I2C_EE_CLK         RCC_APB1Periph_I2C1




#define SCL_H         GPIOB->BSRR = GPIO_Pin_5
#define SCL_L         GPIOB->BRR  = GPIO_Pin_5

#define SDA_H         GPIOB->BSRR = GPIO_Pin_4
#define SDA_L         GPIOB->BRR  = GPIO_Pin_4

#define SCL_read      GPIOB->IDR  & GPIO_Pin_5
#define SDA_read      GPIOB->IDR  & GPIO_Pin_4



 

static unsigned int cntForInitial = 0;
static unsigned char fSigStatus = 0;

//static bool LedStatus = true;

void I2C_Init()
{
	 GPIO_InitTypeDef  GPIO_InitStructure;

	    //* Configure I2C_EE pins: SCL and SDA
	  GPIO_InitStructure.GPIO_Pin =  I2C_EE_SCL | I2C_EE_SDA;
	  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //GPIO_Speed_50MHz;
	  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
	  GPIO_Init(I2C_EE_GPIO, &GPIO_InitStructure);
}


static void i2c_start()
{
 	SDA_H;
 	SCL_H;
 	DelayUs(dTime);
 	SDA_L;
 	DelayUs(dTime);
 	SCL_L;
 	DelayUs(dTime);

 //	LedStatus = !LedStatus;
 	//f_LCT1(LedStatus);
}



/*
******************************************************************
Fuction:
Stop i2c
******************************************************************
*/
static void i2c_stop()
{
    SDA_L;
 	SCL_H;
 	DelayUs(dTime);
 	SDA_H;
 	DelayUs(dTime);
 	SCL_H;
 	DelayUs(dTime);
}

/*
******************************************************************
Fuction:
i2c  Master wait for ack
Only ack
******************************************************************
*/
static unsigned char i2c_rd_ack()
{
    unsigned char flag = 0;
    SDA_H;
 	SCL_H;
 	DelayUs(dTime/2);
 	flag = SDA_read;
 	DelayUs(dTime/2);
 	SCL_L;
 	DelayUs(dTime/2);
 	if(flag == 1)
 		return 0;
 	return 1;
}

/*
******************************************************************
Fuction:
i2c  Byte transmission
Only Send,no ack,no stop
******************************************************************
*/
static unsigned char i2c_sb(unsigned char Byte)
{
	unsigned char cnt;
	SCL_L;
	for(cnt=0;cnt<8;cnt++)
	 {

	  if(Byte&0x80)
	   SDA_H;
	   else
	   SDA_L;
	   DelayUs(dTime);
	   SCL_H;
	   DelayUs(dTime);
	   SCL_L;
	   Byte <<= 1;
	   DelayUs(dTime);
	 }

	 return i2c_rd_ack();

}




/*
******************************************************************
Fuction:
i2c	 Byte receive
Return Byte
******************************************************************
*/
static unsigned char i2c_rb()
{
	unsigned char cnt;
	unsigned char Byte=0;

	SDA_H;
    for(cnt=0;cnt<8;++cnt)
      {

		 Byte <<= 1;
		 DelayUs(dTime);
		 SCL_H;
		 DelayUs(dTime);
		 if(SDA_read)
			 Byte |= 0x01;
		 SCL_L;
		 DelayUs(dTime);
      }
    return Byte;
}



/*
******************************************************************
Fuction:
i2c	 ACK  Master send
******************************************************************
*/
static void i2c_wr_ack(unsigned char ACK)
{
  	if(ACK)
	SDA_H;
	else
	SDA_L;
 	SCL_H;
 	DelayUs(dTime);
 	SCL_L;
 	DelayUs(dTime);
}


/*
******************************************************************
Fuction:
i2c	 Byte receive
Return Byte
******************************************************************
*/
uint8_t ReadReg(unsigned int addr)
{
	    uint8_t temp;

		i2c_start();
		if(!i2c_sb(BRG_DEV_ADDR))
		{
				i2c_stop();
				return 0;
		}

		if(!i2c_sb((uint8_t)(addr >> 8)))
		{
				i2c_stop();
				return 0;
		}

		if(!i2c_sb((uint8_t)(addr & 0xFF)))
		{
			i2c_stop();
			return 0;
		}

		i2c_start();

		if(!i2c_sb(BRG_DEV_ADDR |0x01))
		{
				i2c_stop();
				return 0;
		}
		temp = i2c_rb();
		i2c_wr_ack(1);
		i2c_stop();
		return temp;
}
unsigned char WriteReg8(unsigned int addr,unsigned char wData)
{
	i2c_start();
	if(!i2c_sb(BRG_DEV_ADDR))
		{
				i2c_stop();
				return 0;
		}

		if(!i2c_sb((unsigned char)(addr >> 8)))
		{
				i2c_stop();
				return 0;
		}

		if(!i2c_sb((unsigned char)(addr & 0xFF)))
		{
			i2c_stop();
			return 0;
		}

		if(!i2c_sb((unsigned char)(wData)))
		{
			i2c_stop();
			return 0;
		}
		
	i2c_stop();
	//DelayUs(1);
	return 1;	
}

unsigned char WriteReg16(unsigned int addr,unsigned char wData1,unsigned char wData2)
{
	i2c_start();
	if(!i2c_sb(BRG_DEV_ADDR))
		{
				i2c_stop();
				return 0;
		}

		if(!i2c_sb((unsigned char)(addr >> 8)))
		{
				i2c_stop();
				return 0;
		}

		if(!i2c_sb((unsigned char)(addr & 0xFF)))
		{
			i2c_stop();
			return 0;
		}

		if(!i2c_sb((unsigned char)(wData2)))
		{
				i2c_stop();
				return 0;
		}

		if(!i2c_sb((unsigned char)(wData1)))
		{
			i2c_stop();
			return 0;
		}

	i2c_stop();
	DelayUs(1);
	return 1;	
}


unsigned char WriteReg32(unsigned int addr,unsigned char wData1,unsigned char wData2,unsigned char wData3,unsigned char wData4)
{
	i2c_start();
	if(!i2c_sb(BRG_DEV_ADDR))
		{
				i2c_stop();
				return 0;
		}

		if(!i2c_sb((unsigned char)(addr >> 8)))
		{
				i2c_stop();
				return 0;
		}

		if(!i2c_sb((unsigned char)(addr & 0xFF)))
		{
			i2c_stop();
			return 0;
		}

		if(!i2c_sb((unsigned char)(wData4)))
		{
				i2c_stop();
				return 0;
		}

		if(!i2c_sb((unsigned char)(wData3)))
		{
			i2c_stop();
			return 0;
		}

		if(!i2c_sb((unsigned char)(wData2)))
		{
				i2c_stop();
				return 0;
		}

		if(!i2c_sb((unsigned char)(wData1)))
		{
			i2c_stop();
			return 0;
		}

	i2c_stop();
	DelayUs(1);
	return 1;
}