i2c.c

x9852的应用工程

#include <i2c.h>
void Delay(unsigned char i)
{
	while(i>0)
	i--;	
}
void Start()
{
	SDA=1;
	SCL=1;
	Delay(TIME);
	SDA=0;
	Delay(TIME);
	SCL=0;
	Delay(TIME);
}
void Stop()
{
	SDA=0;
	SCL=1;
	Delay(TIME);
	SDA=1;
	Delay(TIME);
	SCL=0;
	Delay(TIME);
}
void Sent1()
{
	SDA=1;
	SCL=1;
	Delay(TIME);
	SCL=0;
	Delay(TIME);
}
void Sent0()
{
	SDA=0;
	SCL=1;
	Delay(TIME);
	SCL=0;
	Delay(TIME);
}
bit ACK_chack()
{
	bit F0;
	SDA=1;
	SCL=1;
	Delay(TIME/2);
	F0=SDA;
	Delay(TIME/2);
	SCL=0;
	Delay(TIME);
	if(F0==0) return 1;
	else return 0;
}
void Write_c(unsigned char sent)
{
	unsigned char i; 
    for(i=0;i<8;i++) 
      if((sent<<i)&0x80) 
         Sent1(); 
      else 
         Sent0(); 
}
bit Write_nc(unsigned char  *buffer,unsigned char n)
{  
        unsigned char i; 
        Start(); 
        for(i=0;i<n;i++) 
        { 
            Write_c(*buffer); 
            if(!ACK_chack()) 
                { 
                    Stop(); 
                    return 0; 
                } 
			buffer=buffer+1;
        } 
        Stop(); 
        return 1; 
} 
unsigned char Read_c()
{
	unsigned char b=0,i;
	bit F0;
	for(i=0;i<8;i++)
	{
		SDA=1;
		SCL=1;
		Delay(TIME/2);
		F0=SDA;
		Delay(TIME/2);
		SCL=0;
		if(F0==1)
		{
			b=b<<1;
			b=b|0x01;
		}	
		else b=b<<1;			
	}
	return b;
}
bit Read_nc(unsigned char SlaveAdr,unsigned char n,unsigned char *buffer)
{
	unsigned char i;
	Start();
	Write_c(SlaveAdr);
	if(!ACK_chack())
		return 0;
	for(i=0;i<n;i++) 
    { 
		*buffer=Read_c(); 
        if(i!=n) 
			Sent0();    //发送应答 
        else 
			 Sent1();    //发送非应答 
		buffer=buffer+1;
     } 
	 Stop(); 
	 return 1; 
}