ds1307 is not proper output

pradeep.pavai · Sep 14, 2011

i have interfaced ds1307 with 89v51rd2.i am getting the output in uart,but it is wrong.i am getting as time=36:32:0D,Date=1F/1C/3F.can any one help me soon.i have to complete it....

here is the code...

Code:

#include "MF_RC500.h"
#include "MF_Func.h"

//com interrupt server route frandy
void serial_interrupt() interrupt 4 using 1
{   
	if(RI)
 		{
		RI=0;
		com_tmr_rx=5;
		com_r_busy=1;
		datas[0]=SBUF;
		}

	if(TI)
		{       
    		TI=0;
    		TX_RX=0;
   		if(com_t_index<com_t_length)  
   			{
   			TX_RX=1;
				//if(datas[com_t_index++])
      			//SBUF=hextoascii(((datas[com_t_index])>>4)&0x0F);  
				//SBUF=hextoascii((datas[com_t_index])&0x0F);
				//com_t_index++;
				SBUF=(datas[com_t_index++]);
      			}
   		else   			
			{
			com_t_index=com_t_length=0; 
			TX_RX=0;
			}
			
		//SBUF='\r';	
   		}

} 

void Sys_Init(void)
{
     
	RC500CS = 0;
	RC500RST=0;	   
	IE=0x00;
	PCON &= ~0x80;                
	SCON = 0x50;          //mode 1,ren=1              
	
	TMOD=0x21;            //timer 0 is 16 bit
	TH1   = BAUD_9600;
	TL1   = BAUD_9600;
	TR1   = 1;             

	TH0 = TH0_20ms;       //0x2800 time is 60ms
	TL0 = TL0_20ms;
	TR0 = 1;                 //timer 1 run
	ET0 = 1;    
	ET1 = 0;
	ES = 1;    
	EX0=1;
	IT0 = 1;	
    size=0;
    sec_num=block_num/4;     
	EA=1;  
	TX_RX=0;
	//OPEN=0;
	AUXR = 0x02;
}

void timer0_int(void) interrupt 1 using 2
{
	TR0=0;
	TH0=TH0_20ms;
	TL0=TL0_20ms;
	if(com_tmr_rx)	com_tmr_rx--;
	TR0=1;	   
}

void  watch_dog()
{
     WDG=~WDG;
}

void delay_10ms(uchar _10ms)
{              
            while (_10ms--)
            {
            		WDG=!WDG;
                     delay_1ms(10);
            }
}

void delay_20ms(uchar _20ms)
{              
            while (_20ms--)
            {
            		WDG=!WDG;
                     delay_1ms(20);
            }
}

void delay_50ms(uchar _50ms)
{              
            while (_50ms--)
            {
            		WDG=!WDG;
                     delay_1ms(50);
            }
}


void delay_100ms(uchar _100ms){              
            while (_100ms--)
            {
            		WDG=!WDG;
                     delay_1ms(100);
            }
}

void delay_50us(unsigned char _50us)
{
	while(_50us--)
	{
	WDG=!WDG;
   	_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();
 	_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();
	_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();
   	}
}
void delay_1ms(uchar _1ms)
{
  while (_1ms--)
  {	
  	WDG=!WDG;
	delay_50us(25);
  }
}

void main(void)
{ 	
	unsigned int sec, min, hour, date, month, year;
   //uchar sec=0x00, min=0x00, hour=0x00, date=0x00, month=0x00, year=0x00;
//   unsigned int i;
//	RLED=1;   
//	GLED=1;
//	WP=1;
//	SPK=1;
//	WDG = 0;
//	WDG = 1;
	//RC500CS=0;
   	Sys_Init(); 
    //watch_dog();
	DS1307_init();
 //  	RLED=1;
	DS1307_settime(0x01,0x01,0x01);		/* Set Time (hh:mm:ss) */
//	delay_10ms(10);
//	DS1307_setdate(0x01,0x01,0x01);  	/* Set Date (dd/mm/yy) */
   	while (1)
   	{ 	    
		//watch_dog();
			GLED=0;
			delay_10ms(10);
			GLED=1;
		/* Get Date & Time */
		sec   = (DS1307_get(SEC));	
	//	delay_10ms(10);
		min   = (DS1307_get(MIN));	
	//	delay_10ms(10);
		hour  = (DS1307_get(HOUR));
	//	delay_10ms(10);
		date  = (DS1307_get(DATE));
	//	delay_10ms(10);
		month = (DS1307_get(MONTH));
	//	delay_10ms(10);
		year  = (DS1307_get(YEAR));
	//	delay_10ms(10);

		
		
	//	bcd2ascii(sec);
	//	bcd2ascii(min);
	//	bcd2ascii(hour);
	//	bcd2ascii(date);
	//	bcd2ascii(month);
	//	bcd2ascii(year);
		
	
		datas[0] = hextoascii(((BCD2HEX(hour))>>4)&0x0F);
		datas[1] = hextoascii((BCD2HEX(hour))&0x0f);
		datas[2]=':';
		datas[3]=hextoascii(((BCD2HEX(min))>>4)&0x0F);
		datas[4]=hextoascii((BCD2HEX(min))&0x0f);
		datas[5]=':';
		datas[6]=hextoascii(((BCD2HEX(sec))>>4)&0x0F);
		datas[7]=hextoascii((BCD2HEX(sec))&0x0f);
		datas[8]=' ';
		datas[9]=hextoascii(((BCD2HEX(date))>>4)&0x0F);
		datas[10]=hextoascii((BCD2HEX(date))&0x0f);
		datas[11]='/';
		datas[12]=hextoascii(((BCD2HEX(month))>>4)&0x0F);
		datas[13]=hextoascii((BCD2HEX(month))&0x0f);
		datas[14]='/';
		datas[15]=hextoascii(((BCD2HEX(year))>>4)&0x0F);
		datas[16]=hextoascii((BCD2HEX(year))&0x0f);
		datas[17]='\r';
		com_t_index=0;
		com_t_length=18;
		TX_RX=1;
		watch_dog();
		TI=1;
	  /* datas[0]=hextoascii((sec>>4)&0x0F);
		datas[1]=hextoascii((sec)&0x0F);
		datas[2]=':';
		datas[3]=hextoascii((min>>4)&0x0F);
		datas[4]=hextoascii((min)&0x0F);
		datas[5]=':';
		datas[6]=hextoascii((hour>>4)&0x0F);
		datas[7]=hextoascii((hour)&0x0F);
		datas[8]=' ';
		datas[9]=hextoascii((date>>4)&0x0F);
		datas[10]=hextoascii((date)&0x0F);
		datas[11]='/';
		datas[12]=hextoascii((month>>4)&0x0F);
		datas[13]=hextoascii((month)&0x0F);
		datas[14]='/';
		datas[15]=hextoascii((year>>4)&0x0F);
		datas[16]=hextoascii((year)&0x0F);
		datas[17]='\r';
		com_t_index=0;
		com_t_length=18;
		TX_RX=1;
		watch_dog();
		TI=1;*/
	    delay_50ms(50);
	}
}

void DS1307_init(void)
{
	I2C_start();  
	I2C_write(DS1307_ID);	
	I2C_write(0x00);	
	I2C_write(0x00);
	I2C_stop();
	I2C_start();  
	I2C_write(DS1307_ID);	
	I2C_write(0x07);	
	I2C_write(0x10);
	I2C_stop();     
}
unsigned int DS1307_get(unsigned char addr)
{
	unsigned int ret=0;	
	I2C_write(DS1307_ID);   /* Connect to DS1307 */
	I2C_write(addr);		/* Request RAM address on DS1307 */
	
	I2C_start();			/* Start i2c bus */

	I2C_write(DS1307_ID+1);	/* Connect to DS1307 for Read */
	ret = I2C_read();		/* Receive data */
/*	datas[0]=hextoascii((ret>>4)&0x0F);
	datas[1]=hextoascii((ret)&0x0F);
		com_t_index=0;
		com_t_length=2;
		TX_RX=1;
		watch_dog();
		TI=1;*/
	//delay_10ms(10);
	I2C_stop();				/* Stop i2c bus */

   return ((((ret>>4)&0x0F)*10)+(ret&0x0F));;	
}

void DS1307_settime(unsigned char hh, unsigned char mm, unsigned char ss)
{
	I2C_start(); 

	I2C_write(DS1307_ID);	/* connect to DS1307 */ 
	I2C_write(0x00);		/* Request RAM address at 00H */ 

	I2C_write(ss);			/* Write sec on RAM address 00H */
	I2C_write(mm);			/* Write min on RAM address 01H */
	I2C_write(hh);			/* Write hour on RAM address 02H */
	//delay_20ms(20);
	I2C_stop();           	/* Stop i2c bus */
}

void DS1307_setdate(unsigned char dd, unsigned char mm, unsigned char yy)
{
 	I2C_start();	

	I2C_write(DS1307_ID);	/* connect to DS1307 */
	I2C_write(0x04);		/* Request RAM address at 04H */ 

	I2C_write(dd);			/* Write date on RAM address 04H */
	I2C_write(mm);			/* Write month on RAM address 05H */
	I2C_write(yy);			/* Write year on RAM address 06H */
	//delay_20ms(20);
	I2C_stop();				/* Stop i2c bus */
}

void I2C_delay(void)
{
	unsigned char i;

	for(i=0; i<I2C_DELAY; i++);
}

void I2C_clock(void)
{
	I2C_delay();

	SCL_1 = 1;		/* Start clock */

	I2C_delay();    

	SCL_1 = 0;		/* Clear SCL */
}

void I2C_start(void)
{
	if(SCL_1)
	SCL_1 = 0;		/* Clear SCL */

	SDA_1 = 1;        /* Set SDA */
	SCL_1 = 1;		/* Set SCL */

	I2C_delay(); 

	SDA_1 = 0;        /* Clear SDA */

	I2C_delay(); 

	SCL_1 = 0;        /* Clear SCL */
}

void I2C_stop(void)
{
	if(SCL_1)	
	SCL_1 = 0;			/* Clear SCL */

	SDA_1 = 0;			/* Clear SDA */
	I2C_delay();

	SCL_1 = 1;			/* Set SCL */

	I2C_delay();

	SDA_1 = 1;			/* Set SDA */
}

bit I2C_write(unsigned char dat)
{
	bit data_bit;		
	unsigned char i;	

	for(i=0;i<8;i++)				/* For loop 8 time(send data 1 byte) */
	{
		data_bit = dat & 0x80;		/* Filter MSB bit keep to data_bit */
		SDA_1 = data_bit;				/* Send data_bit to SDA */

		I2C_clock();      			/* Call for send data to i2c bus */

		dat = dat<<1;  
	}

	SDA_1 = 1;			/* Set SDA */

	I2C_delay();	
	
	SCL_1 = 1;			/* Set SCL */

	I2C_delay();	

	data_bit = SDA_1;   	/* Check acknowledge */
//	I2C_ack();
/*	datas[0]=hextoascii((data_bit));
	 com_t_index=0;
		com_t_length=1;
		TX_RX=1;
		watch_dog();
		TI=1;*/
	SCL_1 = 0;			/* Clear SCL */

	I2C_delay();

	return data_bit;	/* If send_bit = 0 i2c is valid */	
 	
}

unsigned char I2C_read(void)
{
	bit rd_bit;	
	unsigned char i;
	unsigned int dat=0;

	for(i=0;i<8;i++)		/* For loop read data 1 byte */
	{
		I2C_delay();

		SCL_1 = 1;			/* Set SCL */

		I2C_delay(); 

		rd_bit = SDA_1;		/* Keep for check acknowledge	*/
		dat = dat<<1;		
		dat = dat | rd_bit;	/* Keep bit data in dat */
	
		SCL_1 = 0;			/* Clear SCL */
	}
	
	return dat;
}

/*void I2C_ack()
{
	SDA_1 = 0;		// Clear SDA 

	I2C_delay();    

	I2C_clock();	//Call for send data to i2c bus 

	SDA_1 = 1;		// Set SDA 
}

void I2C_noack()
{
	SDA_1 = 1;		// Set SDA 

	I2C_delay();

	I2C_clock();	// Call for send data to i2c bus 

	SCL_1 = 1;		// Set SCL 
}*/

unsigned short int hextoascii (unsigned char c)
{
	unsigned char ch = c;
	unsigned char as1;
	unsigned char as2;

	// take the char and turn it to ASCII 
	
	as1 = ch;
	as1 >>= 4;
	as1 &= 0x0F;
	if ( as1<10 )
		as1 += 48;
	else
		as1 += 55;
		
	as2 = ch;
	as2 &= 0x0F;
	if ( as2<10 )
		as2 += 48;
	else
		as2 += 55;
		
	return( ((unsigned short int)(as1)<<8) + as2 );
	
	
}

unsigned char BCD2HEX(unsigned int bcd)
{
	unsigned char temp;
	temp=((bcd>>8)*100)|((bcd>>4)*10)|(bcd&0x0f);
	return temp;
	
}

/*unsigned char BCD2UpperCh(unsigned char bcd)
{
return ((bcd >> 4) + '0');
}

unsigned char BCD2LowerCh(unsigned char bcd)
{
return ((bcd & 0x0F) + '0');
}*/

void bcd2ascii(unsigned int val)
  {
     unsigned int d1=0,d2=0;
      d1= val & 0xf0; 
      d1=d1 >> 4; 
      d2=val & 0x0f;
      d1=d1  | 0x30; //ascii values                 
      d2=d2 | 0x30;//ascii values..    
	  datas[0]=d1;
		datas[1]=d2;
		com_t_index=0;
		com_t_length=2;
		TX_RX=1;
		watch_dog();
		TI=1;
 }

 unsigned char asciitohex (unsigned char ch)
{
/*	if( (ch < 0x3A) && (ch > 0x2F) )
		return(ch - 0x30);
	
	if( (ch < 0x47 ) && (ch > 0x40) )
		return(ch - 0x37); 
if( (ch < 0x67 ) && (ch > 0x60) )
		return(ch - 0x57);	
	
	return(0xff);*/
	if((ch>=48)&&(ch<=57))
		return(ch-'0');
	else
		return(ch-'A'+10);
	
}

samba007 · Sep 14, 2011

i have a program that works well try this program

Code:

#include<reg51.h>
#include<intrins.h>

sbit rs=P0^0;
sbit en=P0^1;

sbit sda=P3^6;
sbit scl=P3^7;

unsigned char rtc_adr[8]={0x00,0x01,0x02,0x03,0x04,0x05,0x06};
unsigned char rtc_dat[8]={0x20,0x58,0x23,0x05,0x31,0x12,0x03};
unsigned char dis[7]={0x20,0x20,0x28,0x08,0x0c,0x06,0x80};
unsigned char a,b,c,d;

void strt_bt();
void stp_bt();
void dta_wr();
void dta_rd();					
void cmdwrt();
void datawrt();
void delay();
void rtc_wr();
void rtc_rd();
void display();

main()
{
	int i;
	for (i=0;i<7;i++)
	{
		a=dis[i];
		cmdwrt();
		delay();
	}

	P0=0x00;

	for(i=0;i<8;i++)
	{
		b=rtc_adr[i];
		c=rtc_dat[i];
		rtc_wr();
	}
                                                                         
	while(1)
	{
		a=0x80;
		cmdwrt();
		delay();

		b=0x04;	//date
		rtc_rd();
		display();

		a='/';
		datawrt();
		delay();

		b=0x05;		//month
		rtc_rd();
		display();

		a='/';
		datawrt();
		delay();

		b=0x06;		//yr
		rtc_rd();
		display();

		a='-';
		datawrt();
		delay();

		b=0x03;		//week
		rtc_rd();
		display();

		a=0xc0;
		cmdwrt();
		delay();

		b=0x02;		//hr
		rtc_rd();
		display();

		a=':';
		datawrt();
		delay();	

		b=0x01;		//min
		rtc_rd();
		display();

		a=':';
		datawrt();
		delay();

		b=0x00;		//sec
		rtc_rd();
		display();
	}

}

void rtc_wr()
{
	strt_bt();        //write

	a=0xd0;
	dta_wr();

	a=b;
	dta_wr();

	a=c;
	dta_wr();

	stp_bt();
	delay();
}

void rtc_rd()
{
	strt_bt();      //dummy write

	a=0xd0;
	dta_wr();

	a=b;
	dta_wr();

	strt_bt(); 		//read
	  
	a=0xd1;
	dta_wr();

	dta_rd();


/*	sda=1;
	scl=1;
	_nop_();
	_nop_();
	_nop_();
	_nop_();
	_nop_();
	_nop_();
	_nop_();

	scl=0;
*/
	stp_bt();
	delay();
}

void strt_bt()
{
sda=1;
scl=1;
_nop_();
_nop_();
sda=0;
_nop_();
_nop_();
_nop_();
_nop_();
scl=0;
_nop_();
_nop_();
}

void stp_bt()
{
//scl=0;
sda=0;
scl=1;
_nop_();
_nop_();
//_nop_();
//_nop_();
//_nop_();
sda=1;
_nop_();
_nop_();
_nop_();
_nop_();
scl=0;
_nop_();
_nop_();
_nop_();
_nop_();
scl=1;
}

void dta_wr()
{
int j;
char m;
m=a;
sda=1;
for(j=0;j<8;j++)
{
a=m;
a=a & 0x80;
if(a==(0x80))
sda=1;
else 
sda=0;
scl=1;
_nop_();
_nop_();
_nop_();
_nop_();
scl=0;
m=m<<1;
}

sda=1;
scl=1;
_nop_();
_nop_();
_nop_();
_nop_();

scl=0;
delay();
}

void dta_rd()					
{
int j;
int c=0,b;
sda=1;
for(j=0;j<8;j++)
{
a=a<<1;
scl=1;
c=sda;
if(c)
b=0x01;
else
b=0x00;
scl=0;
a=a|b;
}

sda=1;
//_nop_();
//_nop_();
//_nop_();
//_nop_();
scl=1;
_nop_();
_nop_();
_nop_();	
scl=0;
//datawrt();
delay();
}
                                       
void display()
{
d=a;
a=(a>>4);
a=a & 0x0f;
a=a + 0x30;
datawrt();
delay();

a=d;
a=a & 0x0f;
a=a + 0x30;
datawrt();
delay();
}


void cmdwrt()
{
unsigned char s=0;
s=a;
a=a & 0xf0;
a=a>>2;
rs=0;
P0=a;
rs=0;
en=1;
en=0;
a=s;
a=(a<<4);
a=a & 0xf0;
a=a>>2;
rs=0;
P0=a;
rs=0;
en=1;
en=0;
delay();
}


void datawrt()
{
unsigned char s=0;
s=a;
a=a & 0xf0;
a=a>>2;
rs=1;
//mdata();
//delay();
P0=a;
rs=1;
en=1;
en=0;
a=s;
a=a<<4;
a=a & 0xf0;
a=a>>2;
rs=1;
//mdata();
P0=a;
rs=1;
en=1;
en=0;
delay();
}


void delay()
{
int i;
for(i=0;i<1000;i++);
}

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ds1307 is not proper output

pradeep.pavai

Newbie level 3

samba007

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