標(biāo)題: IIC總線數(shù)據(jù)傳輸 [打印本頁]

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作者: liumei    時(shí)間: 2014-4-26 14:16
標(biāo)題: IIC總線數(shù)據(jù)傳輸
#include <reg52.h>
#define uchar unsigned char
sbit sda=P2^0;
sbit scl=P2^1;
sbit dula=P2^6;
sbit wela=P2^7;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
void delay()
{
; ;
}
void delay1()
{ uchar x,y;
for(x=100;x>0;x--)
  for(y=200;y>0;y--);
}
void init()
{
sda=1;
delay();
scl=1;
delay();
}
void start()
{
sda=1;
delay();
scl=1;
delay();
sda=0;
delay();

}
void stop()
{
sda=0;
delay();
scl=1;
delay();
sda=1;
delay();

}
void respond()
{
uchar i;
scl=1;
delay();
while((sda==1)&&(i<250))i++;
scl=0;
delay();
}
void write_byte(uchar date)
{
uchar i,j;
j=date;
for(i=0;i<8;i++)
{
  j=j<<1;
  scl=0;
  delay();
  sda=CY;
  delay();
  delay();
  scl=1;
  delay();
}
scl=0;
delay();
sda=1;
delay();
}
uchar read_byte()
{
uchar i,k;
scl=0;
delay();
sda=1;
delay();
for(i=0;i<8;i++)
{  
  scl=1;
  delay();
  k=(k<<1)|sda;
  delay();
  scl=0;
  delay();
}
return k;
}
void write_add(uchar address,uchar date)
{
start();
write_byte(0xa0);
respond();
write_byte(address);
respond();
write_byte(date);
respond();
stop();
delay();
}
uchar read_add(uchar address)
{
uchar a;
start();
write_byte(0xa0);
respond();
write_byte(address);
respond();
start();
write_byte(0xa1);
respond();
a=read_byte();
stop();
return a;
}
void main()
{
uchar kk;
init();
wela=1;
P0=0xc0;
wela=0;
dula=1;
P0=0;
dula=0;
while(1)
{
  for(kk=0;kk<16;kk++)
  {
   write_add(kk,table[kk]);
   delay1();
   delay1();
   delay1();
   delay1();
   delay1();
   delay1();
   delay1();
   delay1();
   dula=1;
   P0=read_add(kk);
   dula=0;
  }

  }

}

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