ds1302op.c

时钟芯片ds1302 程序 源程序按版本号放在文件夹中。里面有在Protues中仿真的DSN文件。 打开MPLAB的MCP文件进行编译 将DSN文件载入Protues中 将生成的HEX导入到P

#include "DS1302op.h"

#define ReadData    1
#define WriteData   0
#define MyINDF  INDF

/*Define DS1302 command byte
*bit0 is Write and read control, 1 is read, 0 is write
*bit1 - bit5 is address bits, so we must use a shift left command
*to rise the normal address in command byte
*for the Time RAM, only 0-8 is available
*if the address bits set to 11111, start the brust mode
*bit6 is time and RAM control
*1 is for the RAM operation,0 is for the Time operation
*/

//define a global variable, so that the data transfer between 
//the functions will be faster
//and can make the asm code easier
unsigned char DataAll;

//declare an inner function, read and write a byte
//before use the write function
//Make sure the clock bit is low and the RST bit is high
void    WriteByte();
//before use the read function
//Make sure the clock bit is high and the RST bit is high
void    ReadByte();

//Write a data in the specify addres
void    WriteDS(unsigned char addr, unsigned char data)
{
        DS_RST=1;
        DataAll=addr;
        DS_Clock=0;
        WriteByte();
        DataAll=data;
        WriteByte(); 
        DS_RST=0;
}

//Read a data in the specify addres
//return the value you read
unsigned char    ReadDS(unsigned char addr)
{
        DS_RST=1;
        DataAll=addr;
        DS_Clock=0;
        WriteByte();
        ReadByte();
        DS_RST=0;
        return DataAll;
}

//Write or read data in brust mode
//require input or outpur address
//data length and operate command
//*********ASM code***************
#if      ASMCode == 1
void    WriteDSAll(unsigned char *ptr,\
unsigned char length,unsigned char opCMD)
{
        DS_RST=1;
        DataAll=opCMD;
        DS_Clock=0;
        WriteByte();
        //*******ASM code*******
        ptr=ptr;  //Set the correct bank and "movf addr,w"
        asm("movwf _FSR");
        do{
        asm("movf 0x0,w");
        asm("movwf _DataAll");
        asm("incf _FSR,f");
        WriteByte();
        }while(--length);
        //*/
        DS_RST=0;
}
unsigned char    ReadDSAll(unsigned char *addr,\
unsigned char length,unsigned char opCMD)
{       
        DS_RST=1;
        DataAll=opCMD;
        DS_Clock=0;
        WriteByte();
        //*********ASM code*******
        addr=addr;   //Set the correct bank and "movf addr,w"
        asm("movwf _FSR");
        do{
            ReadByte();
            asm("movf _DataAll,w");
            asm("movwf 0x00");
            asm("incf _FSR,f");    
        }while(--length);
        //*/
        DS_RST=0;

}
#endif
//************end of asm code type**********

unsigned char   ReadDSByte(unsigned char addr)
{
    ReadDSAll(&DataAll,1,addr);
}


//inner function
void    ReadByte()
//Make sure the clock bit is high and the RST bit is high
{

    unsigned char i=0x08;
    DataDir=ReadData;
    do
    {
    DS_Clock=0;
    DataAll/=2;
    if(DS_Data)
        DataAll|=0x80;
    DS_Clock=1;
    }while(--i);
}

void    WriteByte()
//Make sure the clock bit is low and the RST bit is high
{
    unsigned char i=8;
    DataDir=WriteData;
    do
    {
        DS_Clock=0;
        DS_Data=0;
        if(DataAll&0x01)
            DS_Data=1;
        asm("rrf _DataAll,f");
        DS_Clock=1;
    }while(--i);
}


//Write or read in brust mode
//********** C code ******************
#if     ASMCode != 1
void    WriteDSAll(unsigned char *ptr,\
unsigned char length,unsigned char opCMD)
{   
        unsigned char i;
        DS_RST=1;
        DataAll=opCMD;
        DS_Clock=0;
        WriteByte();
        i=0;
        do{
        DataAll=ptr[i++];
        WriteByte();
        }while(--length);
        DS_RST=0;
}
void    ReadDSAll(unsigned char *addr,\
unsigned char length,unsigned char opCMD)
{       
        unsigned char i;
        DS_RST=1;
        DataAll=opCMD;
        DS_Clock=0;
        WriteByte();
        i=0;
        do{
            ReadByte();
            addr[i++]=DataAll;
        }while(--length);
        DS_RST=0;

}
#endif