基于C8051F的DS1302程序

#include "C8051F340.h"
#define uint  unsigned int
#define uchar unsigned char
sbit SCLK = P2^3 ;   //DS1302时钟
sbit DIO = P2^4 ;   //DS1302数据
sbit CE  = P2^5 ;           //DS1302片选
void Ds1302_Write_Byte (uchar addr, uchar dat);
uchar Ds1302_Read_Byte ( uchar addr );  
void Ds1302_Write_Time(void);
void Ds1302_Read_Time(void);
void Ds1302_Init(void)

#define WRITE_SECOND              0x80
#define WRITE_MINUTE              0x82
#define WRITE_HOUR                0x84
#define WRITE_DAY                 0x86
#define WRITE_MONTH               0x88
#define WRITE_WEEK                0x8A
#define WRITE_YEAR                0x8C
#define WRITE_TIMER_FLAG          0xC0

#define READ_SECOND               0x81
#define READ_MINUTE               0x83
#define READ_HOUR                 0x85
#define READ_DAY                  0x87
#define READ_MONTH                0x89
#define READ_WEEK                 0x8B
#define READ_YEAR                 0x8D
#define READ_TIMER_FLAG           0xC1
#define WRITE_PROTECT             0x8E
uchar  time_buf1[8] = {20,11,8,31,13,35,10,3};        //空年月日时分秒周
uchar time_buf[8];                                  //空年月日时分秒周

//============================================
//函数名称：void Ds1302_Write_Byte (byte addr, byte dat) 
//功能：    串行发送地址、数据，先发低位，且在上升沿发送
//参数传递：有，地址和数据
//返回值：  无
//===========================================
void Ds1302_Write_Byte (uchar addr, uchar dat)    
{
  uchar i;
  //DIOOUT;                       //数据端口定义为输出
  CE = 1;
 //写入目标地址：addr
 addr = addr & 0xFE;            //最低位置零
 for (i = 0; i < 8; i ++)
   {
      if (addr & 0x01)
        {
          DIO = 1;
        }
      else
        {
          DIO = 0;
        }
      SCLK = 1;
      SCLK = 0;
      addr = addr >> 1;
   }
 
 //写入数据：d
  for (i = 0; i < 8; i ++)
    {
       if (dat & 0x01)
         {
           DIO = 1;
         }
      else
         {
            DIO = 0;
         }
      SCLK = 1;
      SCLK = 0;
      dat = dat >> 1;
    }
  CE = 0;;                     //停止DS1302总线

}
//===============================================
//函数名称：byte Ds1302_Read_Byte ( byte addr )
//功能：    串行读取数据，先发低位，且在下降沿发送
//参数传递：有，地址
//返回值：  有，读取的数据
//===============================================
uchar Ds1302_Read_Byte ( uchar  addr )
  {
    uchar  i;
    uchar  temp;
    CE = 1;

//写入目标地址：addr
    addr = addr | 0x01;               //最低位置高
    for (i = 0; i < 8; i ++)
      {     
        if (addr & 0x01)
          {
            DIO = 1;
          }
        else
          {
            DIO = 0;
          }
       SCLK = 1;
       SCLK = 0;
       addr = addr >> 1;
      }
 
//输出数据：temp
    //DIOIN;                          //数据端口定义为输入
    for (i = 0; i < 8; i ++)
      {
        temp = temp >> 1;
        if (DIO)
          {
            temp |= 0x80;
          }
        else
          {
            temp &= 0x7F;
          }
        SCLK = 1;
        SCLK = 0;
      }
  CE = 0;                         //停止DS1302总线
  //DIOOUT;                         //数据端口定义为输出
  return temp;                   
}
//===============================================
//           向DS1302写入时钟数据
//===============================================
void Ds1302_Write_Time(void)
{
    
 uchar i,tmp;
 for(i=0;i<8;i++)
     {                                             //BCD处理
        tmp=time_buf1[i]/10;
        time_buf[i]=time_buf1[i]%10;
        time_buf[i]=time_buf[i]+tmp*16;
     }
 Ds1302_Write_Byte(WRITE_PROTECT,0x00);           //关闭写保护
 Ds1302_Write_Byte(WRITE_SECOND,0x80);            //暂停
 //Ds1302_Write_Byte(ds1302_charger_add,0xa9);    //涓流充电
 Ds1302_Write_Byte(WRITE_YEAR,time_buf[1]);       //年
 Ds1302_Write_Byte(WRITE_MONTH,time_buf[2]);      //月
 Ds1302_Write_Byte(WRITE_DAY,time_buf[3]);        //日
 Ds1302_Write_Byte(WRITE_HOUR,time_buf[4]);       //时
 Ds1302_Write_Byte(WRITE_MINUTE,time_buf[5]);     //分
 Ds1302_Write_Byte(WRITE_SECOND,time_buf[6]);     //秒
 Ds1302_Write_Byte(WRITE_WEEK,time_buf[7]);       //周
 Ds1302_Write_Byte(WRITE_PROTECT,0x80);           //打开写保护
}

//========================================
//           从DS1302读出时钟数据
//========================================
void Ds1302_Read_Time(void) 
{
 uchar  i,tmp;
 time_buf[1]=Ds1302_Read_Byte(READ_YEAR);          //年
 time_buf[2]=Ds1302_Read_Byte(READ_MONTH);         //月
 time_buf[3]=Ds1302_Read_Byte(READ_DAY);           //日
 time_buf[4]=Ds1302_Read_Byte(READ_HOUR);          //时
 time_buf[5]=Ds1302_Read_Byte(READ_MINUTE);        //分
 time_buf[6]=(Ds1302_Read_Byte(READ_SECOND))&0x7F; //秒
 time_buf[7]=Ds1302_Read_Byte(READ_WEEK);          //周

 for(i=0;i<8;i++)
  {                                                 //BCD处理
    tmp=time_buf[i]/16;
    time_buf1[i]=time_buf[i]%16;
    time_buf1[i]=time_buf1[i]+tmp*10;
  }
}
//==========================================
//                DS1302初始化
//==========================================
void Ds1302_Init(void)
{
  CE = 0;                                      //RST脚置低
  SCLK = 0;                                    //SCK脚置低
  Ds1302_Write_Byte(WRITE_SECOND,0x00);        //开始 
}