DS1302.cpp

/******************************************************************************
----------------1.开发环境:Arduino IDE-----------------------------------------
----------------2.测试使用开发板型号：Arduino UNO R3-------
----------------3.单片机使用晶振：16M------------------------------------------
----------------4.作者：神秘藏宝室---------------------------------------------
******************************************************************************/
#include "DS1302.h"

SYSTEMTIME DS1302Buffer;
bool Flag_Time_Refresh = 1;

//****************************************************
//实时时钟写入一字节(内部函数)
//****************************************************
void DS1302_InputByte(unsigned char dat)    
{ 
    unsigned char i;

    pinMode(DS1302_IO,OUTPUT);

    for(i=0; i<8; i++)
    {
        if((dat & 0x01) == 1)
        {
            DS1302_IO_1;
        }
        else
        {
            DS1302_IO_0;
        }
          
        
        DS1302_CLK_0;               //上升沿写入数据
        
        delayMicroseconds(2);
        
        DS1302_CLK_1;
        
        delayMicroseconds(2);
        dat >>= 1; 
    } 
}

//****************************************************
//实时时钟读取一字节(内部函数)
//****************************************************
unsigned char DS1302_OutputByte(void)   
{ 
    unsigned char i;
    unsigned char dat;
    pinMode(DS1302_IO,INPUT);
    for(i=0; i<8; i++)
    {
        DS1302_CLK_1;                   //下降沿读出数据
        delayMicroseconds(2);
        DS1302_CLK_0;
        delayMicroseconds(2);
        dat >>= 1;                  
        if( digitalRead(DS1302_IO) == HIGH )
            dat |= 0x80;                //最高位置一
        else
            dat &= 0x7F;                //最高位清零       
    } 
    return(dat); 
}

//****************************************************
//ucAddr: DS1302地址, ucData: 要写的数据
//****************************************************
void DS1302_Write(unsigned char ucAddr, unsigned char ucDa) 
{
    DS1302_RST_0;
    delayMicroseconds(2);
    DS1302_CLK_0;
    delayMicroseconds(2);
    DS1302_RST_1;
    delayMicroseconds(2);
    DS1302_InputByte(ucAddr);           // 地址，命令 
    DS1302_InputByte(ucDa);             // 写1Byte数据
    DS1302_CLK_1;
    delayMicroseconds(2);
    DS1302_RST_0;
    delayMicroseconds(2);
}

//****************************************************
//读取DS1302某地址的数据
//****************************************************
unsigned char DS1302_Read(unsigned char ucAddr) 
{
    unsigned char ucData;
    DS1302_RST_0;
    delayMicroseconds(2);
    DS1302_CLK_0;
    delayMicroseconds(2);
    DS1302_RST_1;
    delayMicroseconds(2);
    DS1302_InputByte(ucAddr|0x01);        // 地址，命令 
    ucData = DS1302_OutputByte();         // 读1Byte数据
    DS1302_CLK_1;
    delayMicroseconds(2);
    DS1302_RST_0;
    delayMicroseconds(2);
    return(ucData);
}

//****************************************************
//是否写保护
//****************************************************
void DS1302_SetProtect(unsigned char flag)       
{
    if(flag)
        DS1302_Write(0x8E,0x10);            //保护
    else
        DS1302_Write(0x8E,0x00);            //不保护
} 

//****************************************************
// 设置时间函数
//****************************************************
void DS1302_SetTime(unsigned char Address, unsigned char Value)        
{
    DS1302_SetProtect(0);
    DS1302_Write(Address, ((Value/10)<<4 | (Value%10))); 
}

//****************************************************
//获取实时时间
//****************************************************
void DS1302_GetTime(SYSTEMTIME *Time)
{
    unsigned char ReadValue;
    ReadValue = DS1302_Read(DS1302_SECOND);
    ReadValue = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F);            //BCD码转换十进制
    if(ReadValue != DS1302Buffer.Second)                                //跟上一次状态不同，置位刷新标志位
        Flag_Time_Refresh = 1;
    Time->Second = ReadValue;

    ReadValue = DS1302_Read(DS1302_MINUTE);
    Time->Minute = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F);
    ReadValue = DS1302_Read(DS1302_HOUR);
    Time->Hour = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F);
    ReadValue = DS1302_Read(DS1302_DAY);
    Time->Day = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F);    
    ReadValue = DS1302_Read(DS1302_WEEK);
    Time->Week = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F);
    ReadValue = DS1302_Read(DS1302_MONTH);
    Time->Month = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F);
    ReadValue = DS1302_Read(DS1302_YEAR);
    Time->Year = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F);   
}

//****************************************************
//初始化
//****************************************************
void DS1302_Init(void)
{
    unsigned char Second;

    pinMode(DS1302_RST,OUTPUT);
    pinMode(DS1302_IO,OUTPUT);
    pinMode(DS1302_CLK,OUTPUT);

    Second = DS1302_Read(DS1302_SECOND);
    if(Second&0x80)       
        DS1302_SetTime(DS1302_SECOND,Second & 0x7f);    //开启振荡    
}
//****************************************************
//DS1302振荡器停止
//****************************************************
void DS1302_ON_OFF(bool FLAG_ON_OFF)
{
    unsigned char Second;
    Second = DS1302_Read(DS1302_SECOND);
    if(FLAG_ON_OFF == 0)
        DS1302_Write(DS1302_SECOND,Second | 0x80);              //关闭振荡
    else
        DS1302_Write(DS1302_SECOND,Second & 0x7f);              //开启振荡
}