ds12c887.c

DS12C887驱动 DS12C887

/*************************************************
  File name:    DS12C887.c
  Author:       Jinku Hu       
  Version:      1.0        
  Date:         2008.06.19
  Description:   All fuctions related with RTC DS12C887 is contained   
  Others:         
  Function List: 

  History:        
    Date            Author      Modification
    2008.06.19      Jinku Hu    Build up   

*************************************************/

// Define interface between DS12C887 and MCU
sbit DS12C887_RST = P1^6;
sbit DS12C887_CS = P2^5;

// Define constant related with Reg in DS12C887
#define CMD_START_DS12C887     0x20            // Start DS12C887
#define CMD_START_OSCILLATOR 0x70            // Start Oscillator
#define CMD_CLOSE_DS12C887     0x30            // Close DS12C887

// Set bit with OR, Clear bit with AND
#define MASK_SETB_SET         0x80            // Unable update
#define MASK_CLR_SET         0x7f             // Enable update
#define MASK_SETB_DM         0x04             // Binary format
#define MASK_CLR_DM             0xfb          // BCD format
#define MASK_SETB_2412         0x02           // 24 hours format
#define MASK_CLR_2412         0xfd            // 12 hours format
#define MASK_SETB_DSE         0x01            // Daylight Savings Enable
#define MASK_CLR_DSE         0xfe             // Daylight Savings Unable


// Define Reg of DS12C887
#define DS12C887_Second  XBYTE[0xC000]  //Second
#define DS12C887_Minute  XBYTE[0xC002]  //Minute
#define DS12C887_Hour    XBYTE[0xC004]  //Hour
#define DS12C887_Week    XBYTE[0xC006]  //Week
#define DS12C887_Day     XBYTE[0xC007]  //Day
#define DS12C887_Month   XBYTE[0xC008]  //Month
#define DS12C887_Year    XBYTE[0xC009]  //Year
#define DS12C887_RegA    XBYTE[0xC00a]  //Register A，A.7 to check busy or not
#define DS12C887_RegB    XBYTE[0xC00b]  //Register B，B.7
                                        //            B.2 BCD cod or Binary：1 Binary
                                        //            B.1 format of hour bytes 24/12 
                                        //            1 24 hour format
#define DS12C887_RegC    XBYTE[0xC00c]  //Register C
#define DS12C887_RegD    XBYTE[0xC00d]  //Register D
#define DS12C887_Century XBYTE[0xC032]  //Century

unsigned char DS12C887_Century_Binary;  //Binary mode of Century Reg

/*************************************************
  Function:       DS12C887_Start
  Description:    Start DS12C887.
                  It is used only once when DS12C887 is first used
  Calls:          
                  
  Called By:      
                  
  Input:          NULL                  
  Output:         NULL
  Return:         
  Others:         
  History:
    Date        Author          Modification
    2008.06.19  Jinku Hu        Build Up
*************************************************/  
void DS12C887_Start(void)
{
    DS12C887_RegA = CMD_START_DS12C887;
}

/*************************************************
  Function:       DS12C887_Start
  Description:    Close DS12C887.
                  It's seldom used.
  Calls:          
                  
  Called By:      
                  
  Input:          NULL                  
  Output:         NULL
  Return:         
  Others:         
  History:
    Date        Author          Modification
    2008.06.19  Jinku Hu        Build Up
*************************************************/ 
void DS12C887_Close(void)
{
    DS12C887_RegA = CMD_CLOSE_DS12C887;
}

/*************************************************
  Function:       DS12C887_Initial
  Description:    Initialize DS12C887.
                  
  Calls:          DS12C887_Start          
                  
  Called By:      
                  
  Input:          NULL                  
  Output:         NULL
  Return:         
  Others:         
  History:
    Date        Author          Modification
    2008.06.19  Jinku Hu        Build Up
*************************************************/ 
void DS12C887_Initial()
{   
    DS12C887_RST = 1;   //Unable Reset of DS12C887
    DS12C887_Start();
    
    DS12C887_RegB = DS12C887_RegB | MASK_SETB_SET;        /*Unable to update*/
    DS12C887_RegB = DS12C887_RegB | MASK_SETB_DM | MASK_SETB_2412  
                     & MASK_CLR_DSE;    /*Binary code, 24 hours format, Daylight Saving forbidden*/
    DS12C887_Century = 0x20;                /*Set Century Reg as 21*/
    DS12C887_RegB = DS12C887_RegB & MASK_CLR_SET;            /* Enable update */
}

/*************************************************
  Function:       DS12C887_Century_Get
  Description:    Get century data from DS12C887
                  
  Calls:                
                  
  Called By:      
                  
  Input:          NULL                  
  Output:         NULL
  Return:         DS12C887_Century
  Others:         
  History:
    Date        Author          Modification
    2008.06.19  Jinku Hu        Build Up
*************************************************/
unsigned char DS12C887_Century_Get(void)
{
    if(DS12C887_Century == 0x20)
        return(20);
    else
        return(19);
}    

/*************************************************
  Function:       DS12C887_Time_Set
  Description:    Set time of DS12C887
                  
  Calls:                
                  
  Called By:      
                  
  Input:          chSeconds、chMinutes、chHours is in Binary code                
  Output:         NULL
  Return:         DS12C887_Minute
  Others:         
  History:
    Date        Author          Modification
    2008.06.19  Jinku Hu        Build Up
*************************************************/  
void DS12C887_Time_Set(unsigned char chSeconds,
                                unsigned char chMinutes,unsigned char chHours)
{
    DS12C887_RegB = DS12C887_RegB | MASK_SETB_SET;        /*Unable update*/
    DS12C887_Second = chSeconds;
    DS12C887_Minute = chMinutes;
    DS12C887_Hour = chHours;
    DS12C887_RegB = DS12C887_RegB & MASK_CLR_SET;            /*Enable update*/
}

/*************************************************
  Function:       DS12C887_Time_Set
  Description:    Set time of DS12C887
                  
  Calls:                
                  
  Called By:      
                  
  Input:          chDate、chMonth、chYear is in Binary code
  Output:         NULL
  Return:         DS12C887_Minute
  Others:         
  History:
    Date        Author          Modification
    2008.06.19  Jinku Hu        Build Up
*************************************************/    
void DS12C887_Date_Set(unsigned char chDate,unsigned char chMonth,unsigned char chYear)
{
    DS12C887_RegB = DS12C887_RegB | MASK_SETB_SET;        /*Unable update*/
    DS12C887_Day = chDate;
    DS12C887_Month = chMonth;
    DS12C887_Year = chYear;
    DS12C887_RegB = DS12C887_RegB & MASK_CLR_SET;            /*Enable update*/
}