?? iiccon.h
字號:
void delay_2()
{ ; ; }
/*void delay1(uchar x)//x毫秒延遲
{
uchar a,b;
for(a=x;a>0;a--)
for(b=120;b>0;b--);
}
*/
void start()//iic開始信號
{
sda=1;
delay_2();
scl=1;
delay_2();
sda=0;
delay_2();
}
void stop()//IIc停止信號
{
sda=0;
delay_2();
scl=1;
delay_2();
sda=1;
delay_2();
}
void respons() //iic應答信號
{
uchar i;
scl=1;
delay_2();
while((sda==1)&&(i<250))i++;
scl=0;
delay_2();
}
void ic_init()//iic初始化
{
scl=1;
delay_2();
sda=1;
delay_2();
}
void write_byte(uchar date)//向iic寫單個數據
{
uchar i,temp;
temp=date;
for(i=0;i<8;i++)
{
temp=temp<<1;
scl=0;
delay_2();
sda=CY;
delay_2();
scl=1;
delay_2();
// scl=0;
// delay();
}
scl=0;
delay_2();
sda=1;
delay_2();
}
uchar read_byte()//從iic讀單個數據
{
uchar i,k;
scl=0;
delay_2();
sda=1;
delay_2();
for(i=0;i<8;i++)
{
scl=1;
delay_2();
k=(k<<1)|sda;
scl=0;
delay_2();
}
return k;
}
void write_add(uchar address,uchar date)//向iic固定地址寫數據
{
start();
write_byte(0xa0);
respons();
write_byte(address);
respons();
write_byte(date);
respons();
stop();
}
uchar read_add(uchar addr)//從iic固定地址讀數據
{
uchar date;
start();
write_byte(0xa0);
respons();
write_byte(addr);
respons();
start();
write_byte(0xa1);
respons();
date=read_byte();
stop();
return date;
}
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