DS1302 read and write program (IIC bus)-EEWORLD

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#include //Header file containing microcontroller registers

#include //Header file containing _nop_() function definition

#define uchar unsigned char

#define uint unsigned int

sbit SRT=P3^5;

sbit IO=P3^4;

sbit SCK=P3^6;

uchar code table[]={0x3f,0x06,0x5b,0x4f,

0x66,0x6d,0x7d,0x07,

0x7f,0x6f,0x77,0x7c,

0x39,0x5e,0x79,0x71};

uchar miao,fen,shi,tian,yue,zhou,nian;

uchar read_DS1302(uchar addr) //read DS1302 subroutine;

{

fly dat,i,temp,j;

SRT=0;

SCK=0;

IO=0; //Must be set low first, otherwise it is easy to make mistakes;

SRT=1;

for(i=0;i<8;i++)//write address (the address of the data to be read);

{

SCK=0;

dat=addr&0x01;

IO=that;

addr=addr>>1;

SCK=1;

_nop_();

}

// IO=1; //Release the bus for the next read operation,

//Otherwise the data read out will always be 0x00,

//But because the highest bit of addr is always 1, when transmitting the highest bit, that is, IO=dat=1,

//So this sentence can be omitted;

for(j=0;j<8;j++)//read data;

{

SCK=0;

temp>>=1;

if(IO)

temp=temp|0x80;

SCK=1;

_nop_();

}

SCK=0; //Must be pulled low strictly according to the timing, otherwise an error will occur;

SRT=0;

IO=1; //The bus must be released;

return temp;

}

void write_DS1302(uchar add,uchar date) //write DS1302 subroutine;

{

float dat1,i,dat2,j;

SRT=0;

SCK=0;

IO=0;

SRT=1;

_nop_();

for(i=0;i<8;i++)//write the address first;

{

SCK=0;

dat1=add&0x01;

add=add>>1;

IO=dat1;

SCK=1;

_nop_();

}

for(j=0;j<8;j++)//Write data again;

{

SCK=0;

dat2=date&0x01;

date=date>>1;

IO=date2;

SCK=1;

_nop_();

}

SCK=0;

SRT=0;

IO=1;

}

void delay(uint n)

{

while(n--);

}

void display()

{

fly miao1,miao2,fen1,fen2,shi1,shi2;

P0=0xff;

P1=0x00;

miao1=miao&0x0f;

miao2=miao&0xf0;

miao2=miao2>>4;

fen1=fen&0x0f;

fen2=fen&0xf0;

fen2=fen2>>4;

shi1=shi&0x0f;

shi2=shi&0xf0;

shi2=shi2>>4;

P1=table[miao1];

P0=0x7f;

delay(200);

P1=table[miao2];

P0=0xbf;

delay(200);

P1=0x40;

P0=0xdf;

delay(200);

P1=table[fen1];

P0=0xef;

delay(200);

P1=table[fen2];

P0=0xf7;

delay(200);

P1=0x40;

P0=0xfb;

delay(200);

P1=table[shi1];

P0=0xfd;

delay(200);

P1=table[shi2];

P0=0xfe;

delay(200);

}

void main()

{

//Set date and time (2013/09/11, 21:03:00, Wednesday);

while(1)

{

miao=read_DS1302(0x81);

fen=read_DS1302(0x83);

shi=read_DS1302(0x85);

tian=read_DS1302(0x87);

yue=read_DS1302(0x89);

zhou=read_DS1302(0x8b);

nian=read_DS1302(0x8d); //Read DS18B20 data;

P2=miao;

display();

}

Keywords：DS1302 Reference address：DS1302 read and write program (IIC bus)

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