AT24C02 IIC驱动 C代码

ID:75926 · 发表于 2015-4-10 17:26

#define SCL_L //拉低SCL线的宏
#define SCL_H //拉高SCL线的宏
#define SDA_L //拉低SDA线的宏
#define SDA_H //拉高SDA线的宏
#define SDA_Read //读SDA线的宏
#define Wait //延时宏大约为5us
void IIC_Start(void)//启动IIC函数
{
SDA_H;
SCL_H;
Wait;
SDA_L;
Wait;
SCL_L;
Wait;
}
void IIC_Stop(void)//停止IIC函数
{
SDA_L;
SCL_H;
Wait;
SDA_H;
}
void IIC_Send_Byte(uint8_t data)//想IIC器件发送8个位数据
{
uint8_t i;
for(i=0;i<8;i++)
{
if(data&(0x80>>i))
SDA_H;
else
SDA_L;
Wait;
SCL_H;
Wait;
SCL_L;
Wait;
}
SDA_H;
Wait;
}
uint8_t IIC_Read_Byte()//读取8位数据
{
uint8_t i,buff=0x00;
for(i=0;i<8;i++)
{
buff<<=1;
SCL_H;
Wait;
if(SDA_Read)
buff|=0x01;
SCL_L;
Wait;
}
return buff;
}
uint8_t Wait_Ack(void)//等待应答
{
uint8_t flag;
SDA_H;
Wait;
SCL_H;
Wait;
if(SDA_Read)
flag=1;
else
flag=0;
SCL_L;
Wait;
return flag;
}
void Ack(void)//发送应答
{
SDA_L;
Wait;
SCL_H;
Wait;
SCL_L;
Wait;
SDA_H;
}
void NAck(void)//发送非应答
{
SDA_H;
Wait;
SCL_H;
Wait;
SCL_L;
Wait;
}
uint8_t AT24C02_Pag_Write(uint8_t address,uint8_t *data,uint8_t size)//AT24C02写数据函数第一个参数是 AT24C02的要写页的地址 0-255,第二个参数是缓冲区指针,第三个参数是要写的字节数//不能超过8个字节
{
uint8_t i;
IIC_Stop();
for(i=0;i<100;i++)
{
IIC_Start();
IIC_Send_Byte(0xa0);
if(Wait_Ack()==0)
{
break;
}
}
if(m=100)
{
IIC_Stop();
return 0;
}
IIC_Send_Byte(address);
if(Wait_Ack())
{
IIC_Stop();
return 0;
}
for(i=0;i<size;i++)
{
IIC_Send_Byte(*(data+i));
if(Wait_Ack())
{
IIC_Stop();
return 0;
}
}
IIC_Stpo();
return 1;
}
uint8_t AT24C02_Write(uint8_t address,uint8_t *data,uint8_t size)//对任意AT24C02的地址进行写操作其中第一个参数是 AT24C02要写的地址第二个参数是缓冲区指针第三个参数是要写的字节数 0-255;
{
uint8_t Page=0;//所需要的页数
uint8_t Cont=0;//不足一页的字节数
uint8_t Add_Pag=0;//某一页已经写了的字节数
uint8_t Sur=0;//某一页还能写的字节数
Page=size/8;
Cont=size%8;
Add_Pag=address%8;
Sur=8-Add_Pag;
if(Add_Pag==0)
{
if(Page==0)
{
AT24C02_Pag_Write(address,data,size);
Delay();//此函数没有定义需要自己定义大约延时2000us
}
else
{
while(Page--)
{
AT24C02_Pag_Write(address,data,8);
Delay();
address+=8;
data+=8;
}
if(Cont!=0)
{
AT24C02_Pag_Write(address,data,Cont);
Delay(2000);
}
}
}
else
{
if(Page==0)
{
if(Sur>=size)
{
AT24C02_Pag_Write(address,data,size);
Delay;
}
else
{
AT24C02_Pag_Write(address,data,Sur);
Delay;
address+=Sur;
data+=Sur;
AT24C02_Pag_Write(address,data,size-Sur) ;
Delay;
}
}
else
{
AT24C02_Pag_Write(address,data,Sur);
Delay(2000);
address+=Sur;
data+=Sur;
Page=size/8;
Cont=size%8;
Add_Page=address%8;
Sur=8-Add_Page;
if(Page==0)//
{
AT24C02_Pag_Write(address,data,size);
Delay(2000);
}
else//
{
while(Page--)
{
AT24C02_Pag_Write(address,data,8);
Delay(2000);
address+=8;
data+=8;
}
if(Cont!=0)
{
AT24C02_Pag_Write(address,data,Cont);
Delay(2000);
}
}
}
}
}
uint8_t AT24C02_Read(uint8_t address,uint8_t *data,uint8_t size)//从AT24C02读取size个字节第一个参数是读AT24C02 的数据的首地址第二个参数是缓冲区指针第三个参数是要读取的字节数
{
uint8_t i;
IIC_Start();
IIC_Send_Byte(0xa0);
if(Wait_Ack())
{
IIC_Stop();
return 0;
}
IIC_Send_Byte(address)
if(Wait_Ack())
{
IIC_Stop();
return 0;
}
IIC_Start();
IIC_Send_Byte(0xa1);
if(Wait_Ack())
{
IIC_Stop();
return 0;
}
for(i=0;i<size;i++)
{
*(data+i)=IIC_Read_Byte();
if(i!=size-1)
{
Ack();
}
else
{
NAck();
}
}
IIC_Stop();
return 1;
}

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AT24C02 IIC驱动 C代码

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