c_ds1302.c

DS1302的读写

#include <msp430x14x.h>


/*--NOTE--*/
/*--The Access Modulate of the RealTime DS1302--*/
/*--Function: SINGLE BYTE READ --*/
/*--          SINGLE BYTE WRITE--*/


/*--Pin Configure--*/
/*--DS1302_RST#: P2.5--*/
/*--DS1302_SCLK: P2.6--*/
/*--DS1302_IO:   P2.7--*/

/*--The INFORMATION of the DS1302 --*/
/*--The ADDRESS/COMMAND BYTE of the DS1302--*/
/*--1   RAM/CK#   A4      A3     A2     A1    A0   RD/W#    --*/

#define DS1302_RST  BIT5
#define DS1302_SCLK BIT6
#define DS1302_IO   BIT7

/*----------------------------------*/
/*--NAME:      Read_Data_From_1302--*/
/*--FUNCTION:  Read one Data From the DS1302--*/
/*--Parameter: The READING Item(eg. SEC. MIN, HOUR...)--*/
/*--Return Value: The Readed Data--*/
/*--NOTE: --*/
/*--eg. Read_Data_From_1302(con_SEC_READ); --*/
/*--will ReadOut the SEC value of the DS1302--*/

unsigned char Read_Data_From_1302(unsigned char Item){

        unsigned char i;
        unsigned char Temp_Data;
        unsigned char Read_Out_Data;
        
        P2OUT &= ~DS1302_SCLK;        /*--SCLK: LOW--*/

        P2OUT |= DS1302_RST;
        
        /*--OUTPUT the COMMAND--*/
        P2DIR |= DS1302_IO; Delay4us();   /*--DS1302_IO: OUTPUT  Output the Command--*/        
        Temp_Data = 0x01;
        for( i = 0; i < 8; i++){
            P2OUT &= ~DS1302_SCLK;
            if( Temp_Data & Item ){ P2OUT |= DS1302_IO; }  else{ P2OUT &= ~DS1302_IO; }
            P2OUT |= DS1302_SCLK;
            Temp_Data <<= 1;
        }
                
        /*--INPUT the Item's Data--*/
        P2DIR &= ~DS1302_IO; Delay4us();       /*--DS1302_IO: INPUT  Input the Read Data--*/                
        Read_Out_Data = 0x00;
        for( i = 0; i < 8; i++){  
              Read_Out_Data >>= 1;  
              P2OUT &= ~DS1302_SCLK;
              if( P2IN & DS1302_IO ){ Read_Out_Data |= 0x80; }
              P2OUT |= DS1302_SCLK;             
          }                  
        P2OUT &= ~DS1302_SCLK;        /*--SCLK: LOW--*/
        P2OUT &= ~DS1302_RST;         /*--RST: Low--*/
        return Read_Out_Data; 
    }

/*----------------------------------*/
/*--NAME:      Write_Data_To_1302--*/
/*--FUNCTION:  Write Data To the DS1302--*/
/*--Parameter: The Writing Item(eg. SEC. MIN, HOUR...), The Write Data--*/
/*--Return Value: NONE--*/
/*--NOTE:--*/

void Write_Data_To_1302(unsigned char Item_Value, unsigned char Write_Data){

        unsigned char i;
        unsigned char Temp_Data;
        
        P2OUT &= ~DS1302_SCLK;        /*--SCLK: LOW--*/
        P2OUT |= DS1302_RST;

        /*--OUTPUT the COMMAND--*/
        P2DIR |= DS1302_IO; Delay4us(); /*--DS1302_IO: OUTPUT  Output the Command--*/
        Temp_Data = 0x01;
        for( i = 0; i < 8; i++){
              P2OUT &= ~DS1302_SCLK;
              if( Item_Value & Temp_Data ) { P2OUT |= DS1302_IO; } else{ P2OUT &= ~DS1302_IO; }
              P2OUT |= DS1302_SCLK;
              Temp_Data <<= 1;
          }
                
        /*--OUTPUT the Write_Data--*/
        Temp_Data = 0x01;
        for( i = 0; i < 8; i++){
              P2OUT &= ~DS1302_SCLK;
              if( Write_Data & Temp_Data ) { P2OUT |= DS1302_IO; } else{ P2OUT &= ~DS1302_IO; }
              P2OUT |= DS1302_SCLK;
              Temp_Data <<= 1;
          }                  
        P2OUT &= ~DS1302_SCLK;        /*--SCLK: LOW--*/
        P2OUT &= ~DS1302_RST;
    }

#define con_SEC_READ     0x81
#define con_MIN_READ     0x83
#define con_HOUR_READ    0x85
#define con_DATE_READ    0x87
#define con_MONTH_READ   0x89
#define con_DAY_READ     0x8B
#define con_YEAR_READ    0x8D
#define con_CONTROL_READ 0x8F
#define con_CHARGER_READ 0x91
#define con_BURST_READ   0xBF

#define con_SEC_WRITE     0x80
#define con_MIN_WRITE     0x82
#define con_HOUR_WRITE    0x84
#define con_DATE_WRITE    0x86
#define con_MONTH_WRITE   0x88
#define con_DAY_WRITE     0x8A
#define con_YEAR_WRITE    0x8C
#define con_CONTROL_WRITE 0x8E
#define con_CHARGER_WRITE 0x90
#define con_BURST_WRITE   0xBE 

#define con_RAM_READ        0xC1   /*--RAM operation Need an other variable  --*/
#define con_RAM_BURST_READ  0xFF   /*--This variable + con_RAM_READ/WRITE Denote the RAM ADDRESS  --*/
#define con_RAM_WRITE       0xC0   /*--eg. 0x00 + 0xC1/0xC0 denote RAM0, 0x04 + 0xC1/0xC0 denote RAM1--*/
#define con_RAM_BURST_WRITE 0xFE   /*--    0x08 + 0xC1/0xC0 denote RAM2, 0x0C + 0xC1/0xC0 denote RAM3--*/
                                   /*--The Increment of the Variable is 0x04 --*/
                                   
#define con_ENABLE_WRITE    0x00
#define con_DISENABLE_WRITE 0x80
#define con_START_CLOCK     0x00
#define con_STOP_CLOCK      0x80

/*----------------------------------*/
/*--NAME:      Init_DS1302--*/
/*--FUNCTION:  Started Clock, Disenable PROTECT Bit Init Sec Min Hour....--*/
/*--Parameter: the Value Data of SEC. MIN, HOUR...--*/
/*--Return Value: NONE--*/
/*--NOTE:--*/

void Init_DS1302(void){
//     unsigned char i;
     Write_Data_To_1302( con_CONTROL_WRITE, con_ENABLE_WRITE );
     Write_Data_To_1302( con_SEC_WRITE, con_START_CLOCK );
     // for( i = 0; i < 7; i++) Write_Data_To_1302( con_SEC_WRITE + i * 2, Time_Table[i] );        
}