高手请帮忙看下，关于DS1302时钟芯片

只看该作者 · 2008-5-1 19:58

想使用这个芯片做一个时钟
但是读出来的始终是0x7F，查了不少资料，始终不知道怎么解决
已经做了3天了，感觉快疯了。
如果有人有这方面的经验，麻烦指点下，先谢过了
#include "AT89X52.h"
#include "absacc.h"
#include "intrins.h"

sbit clk = P3^4;
sbit dat = P3^5;
sbit rst = P2^7;

unsigned char init[]={0x00,0x00,0x21,0x21,0x10,0x01,0x04};//秒，分，时，日，月，星期，年

//向DS1302写一个字节数据
void WriteOneByte(unsigned char data1)
{
    unsigned char i;
    for(i=8;i>0;i--)
    {

        clk = 0;
              if(data1&0x01)
                  dat = 1;
              else
                  dat = 0;
        clk = 1;
              _nop_();_nop_();
        data1 = data1>>1;
    }
}

//从DS1302读一个字节数据
unsigned char ReadOneByte()
{
    unsigned char i,temp = 0;
    dat = 1;
    for(i =8;i>0;i--)
    {
        clk = 0;
        if(dat == 1)
            temp= temp|0x80;
        else
            temp= temp&0x7f;
        clk = 1;
        temp= temp>>1;
    }
    return temp;
}

void WriteData(unsigned char addr, unsigned char num)
{
    rst = 1;
    WriteOneByte(addr);
    WriteOneByte(num);
    rst =0;
       clk =0;
}

unsigned char ReadData(unsigned char addr)
{
    unsigned char data1;
    rst = 1;
    WriteOneByte(addr);
    data1 = ReadOneByte();
        rst = 0;
    return data1;
}

unsigned char ReadSec()
{
    unsigned char data1;
    data1 = ReadData(0x81);
    return data1;
}
unsigned char ReadMin()
{
    unsigned char data1;
    data1 = ReadData(0x83);
    return data1;
}
void initds1302()
{
        rst=0;
      clk=0;
      WriteData(0x80,0x00);
      WriteData(0x90,0x00);//禁止涡流充电
}
void set_ds1302(unsigned char addr,unsigned char *p,unsigned char n)//写入n个数据
{
      WriteData(0x8e,0x00);//写控制字，允许写操作
      for(;n>0;n--)
      {
        WriteData(addr,*p);
           p++;
           addr=addr+2;
      }
      WriteData(0x8e,0x80);//写保护，不允许写
}
void main()
{
    unsigned char sec,min;
        initds1302();
        set_ds1302(0x80,init,7);
    while(1)
    {
        sec = ReadData(0x81);
        min = ReadData(0x85);
    }
}