SmartGlass/stm32/HARDWARE/BH1750/myiic1.c

#include "myiic1.h"
#include "delay.h"

//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>MYMYIIC11<EFBFBD><EFBFBD>ʼ<EFBFBD>ź<EFBFBD>
void MYIIC1_Start(void)
{
	SDA1_OUT();  //sda<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	MYIIC1_SDA=1;	  	  
	MYIIC1_SCL=1;
	delay_us(4);
 	MYIIC1_SDA=0;	//SDA <EFBFBD>ɸ߱<EFBFBD><EFBFBD><EFBFBD> 
	delay_us(4);
	MYIIC1_SCL=0;	//׼<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 
}	  
//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>MYIIC1ֹͣ<EFBFBD>ź<EFBFBD>
void MYIIC1_Stop(void)
{
	SDA1_OUT();	//sda<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	MYIIC1_SCL=0;
	MYIIC1_SDA=0;
 	delay_us(4); 
	MYIIC1_SCL=1;	//SDA <EFBFBD>ɵͱ<EFBFBD><EFBFBD><EFBFBD>
 	delay_us(4); 
	MYIIC1_SDA=1;	//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>I2C<EFBFBD><EFBFBD><EFBFBD>߽<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ź<EFBFBD> 
 	delay_us(4); 	
}
//<EFBFBD>ȴ<EFBFBD>Ӧ<EFBFBD><EFBFBD><EFBFBD>źŵ<EFBFBD><EFBFBD><EFBFBD>
//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD>1<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><EFBFBD>ʧ<EFBFBD><EFBFBD>
//        0<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><EFBFBD><EFBFBD>ɹ<EFBFBD>
u8 MYIIC1_Wait_Ack(void)
{
	u8 ucErrTime=0;
	SDA1_IN();      //SDA<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>  
	MYIIC1_SDA=1;delay_us(1);	   
	MYIIC1_SCL=1;delay_us(1);	 
	while(READ1_SDA)
	{
		ucErrTime++;
		if(ucErrTime>250)
		{
			MYIIC1_Stop();
			return 1;
		}
	}
	MYIIC1_SCL=0;//ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>0 	   
	return 0;  
} 
//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ACKӦ<EFBFBD><EFBFBD>
void MYIIC1_Ack(void)
{
	MYIIC1_SCL=0;
	SDA1_OUT();
	MYIIC1_SDA=0;
	delay_us(2);
	MYIIC1_SCL=1;
	delay_us(2);
	MYIIC1_SCL=0;
}
//<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ACKӦ<EFBFBD><EFBFBD>		    
void MYIIC1_NAck(void)
{
	MYIIC1_SCL=0;
	SDA1_OUT();
	MYIIC1_SDA=1;
	delay_us(2);
	MYIIC1_SCL=1;
	delay_us(2);
	MYIIC1_SCL=0;
}					 				     
//MYIIC1<EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>ֽ<EFBFBD>	  
void MYIIC1_Send_Byte(u8 txd)
{                        
    u8 t;   
		SDA1_OUT(); 	    
    MYIIC1_SCL=0;//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD>ӿ<EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD>ݴ<EFBFBD><EFBFBD><EFBFBD>
    for(t=0;t<8;t++)
    {              
			if((txd&0x80)>>7)
				MYIIC1_SDA=1;
			else 
				MYIIC1_SDA=0;
    txd<<=1; 	  
		delay_us(2);  
		MYIIC1_SCL=1;
		delay_us(2); 
		MYIIC1_SCL=0;	
		delay_us(2);
    }	 
} 	    
//<EFBFBD><EFBFBD>1<EFBFBD><EFBFBD><EFBFBD>ֽڣ<EFBFBD>ack=1ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ACKӦ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ack=0<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>nACK<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>   
u8 MYIIC1_Read_Byte(unsigned char ack)
{
	unsigned char i,receive=0;
	SDA1_IN();//SDA<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    for(i=0;i<8;i++ )
	{
        MYIIC1_SCL=0; 
        delay_us(2);
				MYIIC1_SCL=1;
        receive<<=1;
        if(READ1_SDA)receive++;   
				delay_us(1); 
    }					 
    if (!ack)
        MYIIC1_NAck();//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>nACK
    else
        MYIIC1_Ack(); //<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ACK   
    return receive;
}