/
iic.c
178 lines (172 loc) · 1.7 KB
/
iic.c
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#include<reg52.h>
#include<intrins.h>
#define uchar unsigned char
#define uint unsigned int
uchar code tabel[]={~0x3f,~0x06,~0x5b,~0x47,~0x66,~0x6d,~0x7d,~0x07,~0x7f,~0x6f,~0x77,~0x7c,~0x39,~0x5e,~0x79,~0x71};
sbit sda=P2^1;
sbit scl=P2^0;
void delay1()
{
uint a=30000;
while(a--);
}
void init()
{
sda=1;
scl=1;
}
void delay()
{
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
}
void start()
{
sda=1;
scl=1;
delay();
sda=0;
delay();
scl=0;
}
void stop()
{
sda=0;
delay();
scl=1;
delay();
sda=1;
delay();
}
void ack()
{
uchar i;
sda=1;
scl=1;
delay();
while(sda==1&&i<200)i++;
scl=0;
delay;
}
void noack()
{
sda=1;
scl=1;
delay();
scl=0;
delay();
}
void write(uchar a)
{
uchar i;
scl=0;
for(i=0;i<8;i++)
{
if((a&0x80)==0x80)
{
sda=1;
}
else
{
sda=0;
}
a=a<<1;
delay();
scl=1;
delay();
scl=0;
delay();
}
sda=1;
delay();
}
uchar read(uchar a)
{
uchar i;
scl=0;
delay();
sda=1;
delay();
for(i=0;i<8;i++)
{
scl=1;
delay();
a=a<<1;
if(sda==1)
{
a++;
}
scl=0;
delay;
}
return a;
}
void write_data(uchar add,uchar a)
{
init();
start();
write(0xa0);
ack;
write(add);
ack;
write(a);
ack;
stop();
}
uchar read_data(uchar add)
{
uchar b;
init();
start();
write(0xa0);
ack;
write(add);
ack();
start();
write(0xa1);
ack;
read();
b=read();
noack;
stop;
return b;
}
void main()
{
/* init();
start();
write(0xa0);
ack;
write(10);
ack;
write(0x55);
ack;
stop();
delay1();
init();
start();
write(0xa0);
ack;
write(10);
ack();
start();
write(0xa1);
ack;
read();
P0=read();
noack;
stop;
while(1); */
uchar k;
k=read_data(7);
k=k%10;
P0=tabel[k];
k++;
write_data(7,k);
}