最近学习IIC。。大家看看写的程序有问题吗？为什么仿真不行呢？
#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit lcden=P3^2;
sbit lcdrs=P3^0;
sbit lcdrw=P3^1;
sbit sda=P2^6;
sbit scl=P2^5;
uchar a;
uchar time[]={0,0,0,0,0,0,0,0};
void delay1(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=100;y>0;y--);
}
void write_com(uchar com)
{
lcdrs=0;
P0=com;
delay1(5);
lcden=1;
delay1(5);
lcden=0;
}
void write_date(uchar date)
{
lcdrs=1;
P0=date;
delay1(5);
lcden=1;
delay1(5);
lcden=0;
}
void init()
{
lcden=0;
lcdrw=0;
write_com(0x38);
write_com(0x0e);
write_com(0x06);
write_com(0x01);
write_com(0x80);
}
void delay()
{ ;; }
void start() //开始信号
{
sda=1;
delay();
scl=1;
delay();
sda=0;
delay();
}
void stop() //停止
{
sda=0;
delay();
scl=1;
delay();
sda=1;
delay();
}
void respons() //应答
{
uchar i;
scl=1;
delay();
while((sda==1)&&(i<250))i++;
scl=0;
delay();
}
void norespons()
{
sda=1;
delay();
scl=1;
delay();
scl=0;
}
void initpcf()
{
sda=1;
delay();
scl=1;
delay();
}
void write_byte(uchar date)
{
uchar i,temp;
temp=date;
for(i=0;i<8;i++)
{
temp=temp<<1;
scl=0;
delay();
sda=CY;
delay();
scl=1;
delay();
// scl=0;
// delay();
}
scl=0;
delay();
sda=1;
delay();
}
uchar read_byte()
{
uchar i=8;
uchar ddate;
sda=1;
while(i--)
{
ddate<<=1;
scl=0;
delay();
scl=1;
delay();
ddate|=sda;
}
scl=0;
return ddate;
}
void delay2(uchar x)
{
uchar a,b;
for(a=x;a>0;a--)
for(b=100;b>0;b--);
}
void write_add(uchar address,uchar date)
{
start();
write_byte(0xa2);
respons();
write_byte(address);
respons();
write_byte(date);
respons();
stop();
}
void getpcf8563(uchar address,uchar count,uchar *buff)
{
uchar i;
start();
write_byte(0xa2);
respons();
write_byte(address);
respons();
start();
write_byte(0xa3);
respons();
for(i=0;i<=count;i++)
{
buff=read_byte();
if(i!=count-1) respons();
}
norespons();
stop();
}
void time_display()
{
uchar temp[3];
getpcf8563(0x02,3,temp);
time[0]=(temp[2]>>4)+'0';
time[1]=(temp[2]&0x0f)+'0';
time[3]=(temp[1]>>4)+'0';
time[4]=(temp[1]&0x0f)+'0';
time[6]=(temp[0]>>4)+'0';
time[7]=(temp[0]&0x0f)+'0';
}
void main()
{
uint b,c;
b=0;
init();
initpcf();
while(1)
{
time_display();
for(c=0;c<8;c++)
{
write_date(time);
b++;
delay1(200);
}
write_com(0x80);
b=0;
}
} |
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