I have read the ds1302 program in programming specifications.

Http://www.ourdev.cn/bbs/bbs_content.jsp? Bbs_sn = 5245747 & bbs_page_no = 1 & search_mode = 1 & search_text = 1302 & bbs_id = 9999

 

*--------------------------------------------------------------------

Function Name: a complete write operation of ds1302
Function:
Note: None
Note: None
Input:
Return: None
--------------------------------------------------------------------*/
Void write (uint8 ADDR, uint8 dat)
{
Clr_rst; // before SCL change to low level, RST must keep low level
Clr_sck;
Set_rst;

// Clr_sck; // also OK !!!
// Clr_rst;
// Set_rst;

// Clr_rst; // Error
// Set_rst;
// Clr_sck;

Operdata = 0x80 | (ADDR <1 );
Writebyte ();
Operdata = dat;
Writebyte ();
/* The following sentence here is not indispensable,
But insert this sentence here can prevent ariseing error!
Because when start operating, RST must keep low level! */
Clr_rst;
}
/*--------------------------------------------------------------------
Function Name: a complete read operation of ds1302
Function:
Note: None
Note: None
Input:
Return: None
--------------------------------------------------------------------*/
Uint8 read (uint8 cmd)
{
// Clr_rst;
Clr_sck;
Set_rst;
Operdata = (CMD <1) | 0x81;
Writebyte ();
Readbyte ();
/* The following sentence here is not indispensable,
But insert this sentence here can prevent ariseing error!
Because when start operating, RST must keep low level! */
Clr_rst;
Return (operdata );
}
/*--------------------------------------------------------------------
Function Name: ds1302 read time
Function:
Note: None
Note: None
Input:
Return: None
--------------------------------------------------------------------*/
Void ds1302_gettime (uint8 * BUF)
{
Uint8 houradr = 2, minuteadr = 1, secondadr = 0;

Buf [0] = read (secondadr );
Buf [0] = changehextoint (BUF [0]);

Buf [1] = read (minuteadr );
Buf [1] = changehextoint (BUF [1]);

Buf [2] = read (houradr );
Buf [2] = changehextoint (BUF [2]);

// Ds1302_speatime ();
}
/*--------------------------------------------------------------------
Function Name: ds1302 read date
Function:
Note: None
Note: None
Input: None
Return: None
--------------------------------------------------------------------*/
// Void ds1302_getdate (void)
//{
//
//}
/*--------------------------------------------------------------------
Function Name: ds1302 split time
Function:
Note: None
Note: the lower layer splits the time to facilitate upper layer calls.
Input: None
Return: None
--------------------------------------------------------------------*/
// Void ds1302_speatime (void)
//{
// Speadata (ds1302second, 2 );
// Ds1302sechi = dataelem [1];
// Ds1302seclow = dataelem [0];
//
// Speadata (ds1302minute, 2 );
// Ds1302minhi = dataelem [1];
// Ds1302minlow = dataelem [0];
//
// Speadata (ds1302hour, 2 );
// Ds1302hourhi = dataelem [1];
// Ds1302hourlow = dataelem [0];
//}
/*--------------------------------------------------------------------
Function Name: ds1302 split date
Function:
Note: None
Note: None
Input: None
Return: None
--------------------------------------------------------------------*/
// Void ds1302_speadate (void)
//{
//
//}
/*--------------------------------------------------------------------
Function Name: ds1302 set time
Function:
Note: None
Note: None
Input:
Return: None
--------------------------------------------------------------------*/
Void ds1302_settime (uint8 hour, uint8 minute, uint8 second)
{
Uint8 houradr = 2, minuteadr = 1, secondadr = 0;

Hour = changeinttohex (hour );
Minute = changeinttohex (minute );
Second = changeinttohex (second );

Openwp ();
Write (houradr, hour );
Write (minuteadr, minute );
Write (secondadr, second );
Closewp ();
}
/*--------------------------------------------------------------------
Function Name: ds1302 set date
Function:
Note: None
Note: None
Input:
Return: None
--------------------------------------------------------------------*/
// Void ds1302_setdate (uint8 year, uint8 month, uint8 Day)
//{
//
//}
/*--------------------------------------------------------------------
Function Name: ds1302 Initialization
Function:
Note: None
Note: None
Input: None
Return: None
--------------------------------------------------------------------*/
Void ds1302_init (void)
{
Out_sck;
Out_sio;
Out_rst;
Openwp ();
Setchargeprmt ();
Closewp ();
}

# Endif