I got header file for DS1302 on a website, i dont understand the whole code! Help!!

This is a discussion on I got header file for DS1302 on a website, i dont understand the whole code! Help!! within the C Programming forums, part of the General Programming Boards category; [tag] I got a header file of DS1302 on a website.. I am trying to understand the code of the ...

  1. #1
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    I got header file for DS1302 on a website, i dont understand the whole code! Help!!

    [tag]
    I got a header file of DS1302 on a website.. I am trying to understand the code of the header file, so i can make changes in order to coordinate with my protoboard. Those comments for the code are in chinese,so i cant understand.
    can someone pls guide me and explain to me the code. There are some parts of it which i do not understand.

    Below is the header file code

    Code:
    #ifndef _REAL_TIMER_DS1302_2003_7_21_ 
    #define _REAL_TIMER_DS1302_2003_7_21_ 
     
    sbit  DS1302_CLK = P1^7;              //实时时钟时钟线引脚  
    sbit  DS1302_IO  = P1^6;              //实时时钟数据线引脚  
    sbit  DS1302_RST = P1^5;              //实时时钟复位线引脚 
    sbit  ACC0 = ACC^0; 
    sbit  ACC7 = ACC^7; 
     
    typedef struct __SYSTEMTIME__ 
    { 
    	unsigned char Second; 
    	unsigned char Minute; 
    	unsigned char Hour; 
    	unsigned char Week; 
    	unsigned char Day; 
    	unsigned char Month; 
    	unsigned char  Year; 
    	unsigned char DateString[9]; 
    	unsigned char TimeString[9]; 
    }SYSTEMTIME;	//定义的时间类型 
     
    #define AM(X)	X 
    #define PM(X)	(X+12)            	  // 转成24小时制 
    #define DS1302_SECOND	0x80 		  
    #define DS1302_SECOND_READ	0x81 
    #define DS1302_MINUTE	0x82
    #define DS1302_MINUTE_READ	0x83 
    #define DS1302_HOUR		0x84
    #define DS1302_HOUR_READ	0x85  
    #define DS1302_WEEK		0x8A 
    #define DS1302_DAY		0x86 
    #define DS1302_MONTH	0x88 
    #define DS1302_YEAR		0x8C 
    #define DS1302_RAM(X)	(0xC0+(X)*2)   	//用于计算 DS1302_RAM 地址的宏
    
    
    void DS1302InputByte(unsigned char d) 	//实时时钟写入一字节(内部函数) 
    {  
        unsigned char i; 
        ACC = d; 
        for(i=8; i>0; i--) 
        { 
            DS1302_IO = ACC0;           	//相当于汇编中的 RRC 
            DS1302_CLK = 1; 
            DS1302_CLK = 0; 
            ACC = ACC >> 1;  
        }  
    } 
     
    unsigned char DS1302OutputByte(void) 	//实时时钟读取一字节(内部函数) 
    {  
        unsigned char i; 
        for(i=8; i>0; i--) 
        { 
            ACC = ACC >>1;         			//相当于汇编中的 RRC  
            ACC7 = DS1302_IO; 
            DS1302_CLK = 1; 
            DS1302_CLK = 0; 
        }  
        return(ACC);  
    } 
     
    void Write1302(unsigned char ucAddr, unsigned char ucDa)	//ucAddr: DS1302地址, ucData: 要写的数据 
    { 
        DS1302_RST = 0; 
        DS1302_CLK = 0; 
        DS1302_RST = 1; 
        DS1302InputByte(ucAddr);       	// 地址,命令  
        DS1302InputByte(ucDa);       	// 写1Byte数据 
        DS1302_CLK = 1; 
        DS1302_RST = 0; 
    }  
     
    unsigned char Read1302(unsigned char ucAddr)	//读取DS1302某地址的数据 
    { 
        unsigned char ucData; 
        DS1302_RST = 0; 
        DS1302_CLK = 0; 
        DS1302_RST = 1; 
        DS1302InputByte(ucAddr|0x01);        // 地址,命令  
        ucData = DS1302OutputByte();         // 读1Byte数据 
        DS1302_CLK = 1; 
        DS1302_RST = 0; 
        return(ucData); 
    } 
     
    void DS1302_SetProtect(bit flag)        //是否写保护 
    { 
    	if(flag) 
    		Write1302(0x8E,0x10); 
    	else 
    		Write1302(0x8E,0x00); 
    } 
     
    void DS1302_SetTime(unsigned char Address, unsigned char Value)        // 设置时间函数 
    { 
    	DS1302_SetProtect(0); 
    	Write1302(Address, ((Value/10)<<4 | (Value%10)));  
    } 
     
    void DS1302_GetTime(SYSTEMTIME *Time) 
    { 
    	unsigned char ReadValue; 
    	ReadValue = Read1302(DS1302_SECOND_READ); 
    	Time->Second = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F); 
    	ReadValue = Read1302(DS1302_MINUTE_READ); 
    	Time->Minute = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F); 
    	ReadValue = Read1302(DS1302_HOUR_READ); 
    	Time->Hour = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F); 
    	ReadValue = Read1302(DS1302_DAY); 
    	Time->Day = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F);	 
    	ReadValue = Read1302(DS1302_WEEK); 
    	Time->Week = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F); 
    	ReadValue = Read1302(DS1302_MONTH); 
    	Time->Month = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F); 
    	ReadValue = Read1302(DS1302_YEAR); 
    	Time->Year = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F);	 
    } 
     
    void DateToStr(SYSTEMTIME *Time) 
    { 
    	Time->DateString[0] = Time->Year/10 + '0'; 
    	Time->DateString[1] = Time->Year%10 + '0'; 
    	Time->DateString[2] = '-'; 
    	Time->DateString[3] = Time->Month/10 + '0'; 
    	Time->DateString[4] = Time->Month%10 + '0'; 
    	Time->DateString[5] = '-'; 
    	Time->DateString[6] = Time->Day/10 + '0'; 
    	Time->DateString[7] = Time->Day%10 + '0'; 
    	Time->DateString[8] = '\0'; 
    } 
     
    void TimeToStr(SYSTEMTIME *Time) 
    { 
    	Time->TimeString[0] = Time->Hour/10 + '0'; 
    	Time->TimeString[1] = Time->Hour%10 + '0'; 
    	Time->TimeString[2] = ':'; 
    	Time->TimeString[3] = Time->Minute/10 + '0'; 
    	Time->TimeString[4] = Time->Minute%10 + '0'; 
    	Time->TimeString[5] = ':'; 
    	Time->TimeString[6] = Time->Second/10 + '0'; 
    	Time->TimeString[7] = Time->Second%10 + '0'; 
    	Time->DateString[8] = '\0'; 
    } 
     
    /*void Initial_DS1302(void) 
    { 
    	unsigned char Second=Read1302(DS1302_SECOND); 
    	if(Second&0x80)		   
    		DS1302_SetTime(DS1302_SECOND,0); 
    } 
     
     
    void BurstWrite1302(unsigned char *pWClock)	//往DS1302写入时钟数据(多字节方式) 
    { 
        unsigned char i; 
        Write1302(0x8e,0x00);         	// 控制命令,WP=0,写操作? 
        DS1302_RST = 0; 
        DS1302_CLK = 0; 
        DS1302_RST = 1; 
        DS1302InputByte(0xbe);        	// 0xbe:时钟多字节写命令 
        for (i = 8; i>0; i--)     		//8Byte = 7Byte 时钟数据 + 1Byte 控制 
        { 
            DS1302InputByte(*pWClock); 	// 写1Byte数据 
            pWClock++; 
        } 
        DS1302_CLK = 1; 
        DS1302_RST = 0; 
    }*/
    /******************************************************************************** 
    void BurstRead1302(unsigned char *pRClock)	//读取DS1302时钟数据(时钟多字节方式) 
    { 
        unsigned char i; 
        DS1302_RST = 0; 
        DS1302_CLK = 0; 
        DS1302_RST = 1; 
        DS1302InputByte(0xbf);             	// 0xbf:时钟多字节读命令  
        for (i=8; i>0; i--)  
        { 
           *pRClock = DS1302OutputByte();   // 读1Byte数据  
           pRClock++; 
        } 
        DS1302_CLK = 1; 
        DS1302_RST = 0; 
    } 
     
    void DS1302_TimeStop(bit flag)           // 是否将时钟停止 
    { 
    	unsigned char Data; 
    	Data=Read1302(DS1302_SECOND); 
    	DS1302_SetProtect(0); 
    	if(flag) 
    		Write1302(DS1302_SECOND, Data|0x80); 
    	else 
    		Write1302(DS1302_SECOND, Data&0x7F); 
    } 
    ********************************************************************************/ 
    #endif

  2. #2
    and the hat of wrongness Salem's Avatar
    Join Date
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    > There are some parts of it which i do not understand.
    And those would be what?

    It would be a complete waste of OUR time to comment the whole thing for you, if all you're really stuck on is a few lines.

    Try to do a bit more work than copy + paste + "help"

    Mind you, that's the kind of problem you get when you google your answer rather than trying to figure it out from reading the manual, trying every last detail in code yourself.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  3. #3
    Registered User
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    To salem : yes, i know.
    But what is ACC??
    I cant find it,i do not know what is it for..

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