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help me about DS1307

 
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PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Jun 02, 2010 11:44 am     Reply with quote
Try to use this ds1307 driver and the example code:
http://www.ccsinfo.com/forum/viewtopic.php?t=23255

Make certain that:
1. You have a 4.7K pull-up resistor on each i2c line: SDA and SCL.
2. You have a 3 volt lithium battery on the Vbat pin of the ds1307.
3. You must have a 32.768 KHz watch crystal on the ds1307.

Notice how this little board has the pull-up resistors, the battery, and
the watch crystal. All of these are needed. If you forget one of them,
your project will not work.
http://www.futurlec.com/Pictures/ET-MINI_DS1307.jpg
tieungu13



Joined: 03 Mar 2010
Posts: 6

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PostPosted: Wed Jun 02, 2010 11:57 am     Reply with quote
PCM programmer wrote:
Try to use this ds1307 driver and the example code:
http://www.ccsinfo.com/forum/viewtopic.php?t=23255

Make certain that:
1. You have a 4.7K pull-up resistor on each i2c line: SDA and SCL.
2. You have a 3 volt lithium battery on the Vbat pin of the ds1307.
3. You must have a 32.768 KHz watch crystal on the ds1307.

Notice how this little board has the pull-up resistors, the battery, and
the watch crystal. All of these are needed. If you forget one of them,
your project will not work.
http://www.futurlec.com/Pictures/ET-MINI_DS1307.jpg

Thanks for helping. I will try now !
tieungu13



Joined: 03 Mar 2010
Posts: 6

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PostPosted: Wed Jun 02, 2010 1:13 pm     Reply with quote
I try but it did not work. I want to show values (min , hour, sec, month , date....) on the LCD.
This is my code and I demo on proteus. I used 18f4550 pic.
Code:

///////////////////////////my function ////////////
#include "C:\Users\Thanh Hai\Desktop\final code\18F4550.h"
#use delay(clock=20000000)
#fuses  HS
#define RTC_SDA  PIN_B0
#define RTC_SCL  PIN_B1
#use i2c(master, sda=RTC_SDA, scl=RTC_SCL)
#include <lcd_lib_8bit.c>
#include <ds1307_thuong.c>

void main()
{ 
   
  BYTE sec;
  BYTE min;
  BYTE hrs;
  BYTE day;
  BYTE month;
  BYTE yr;
  BYTE dow;
 
 ds1307_init();
 ds1307_set_date_time(15,6,5,2,15,20,55);
   setup_adc_ports(NO_ANALOGS|VSS_VDD);
   setup_adc(ADC_OFF);
   setup_psp(PSP_DISABLED);
   setup_spi(FALSE);
   setup_wdt(WDT_OFF);
   setup_timer_0(RTCC_INTERNAL);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DISABLED,0,1);
   setup_comparator(NC_NC_NC_NC);
   setup_vref(FALSE);
   setup_oscillator(False);
Lcd_init();
//set_tris_b(0x00);
///set_tris_d(0x00);
   // TODO: USER CODE!!
   while(1)
   {
     delay_ms(1000);
   
    ds1307_get_date(day,month,yr,dow);
    ds1307_get_time(hrs,min,sec);

    printf(LCD_putchar,"\f\%02d/\%02d/\%02d\r\n",day,month,yr);
   printf(LCD_putchar,"\%02d:\%02d:\%02d", hrs,min,sec);
 
   }
}
////////////////////////my lib LCD ////////////////
#define LCD_RS PIN_B2
//#define LCD_RW
#define LCD_EN PIN_B3

#define LCD_data Port_D

// misc display defines-
#define Line_1 0x80
#define Line_2 0xC0
#define Clear_Scr 0x01

// prototype statements
#separate void LCD_Init ( void );// ham khoi tao LCD
#separate void LCD_SetPosition ( unsigned int cX );//Thiet lap vi tri con tro
#separate void LCD_PutChar ( char cX );// Ham viet1kitu/1chuoi len LCD
#separate void LCD_PutCmd (int cX) ;// Ham gui lenh len LCD
#separate void LCD_PulseEnable ( void );
#separate int1 LCD_ready();

// D/n Cong

#use standard_io (D)
#use standard_io (B)


//khoi tao LCD**********************************************
#separate void LCD_Init ( void )
{
   output_D(~0x00); delay_ms(200);
   LCD_Putcmd(0x38);
   LCD_Putcmd(0x0C);
   LCD_Putcmd(0x01);
   LCD_Putcmd(0x06);

}

#separate void LCD_PutChar ( char cX )
{
   output_high(LCD_RS);
  // output_low(LCD_RW);
   output_D(cX);
   LCD_PulseEnable();
   delay_ms(5);
}

#separate void LCD_PutCmd (int cX )//Gui lenh den LCD
{
   output_low(LCD_RS);//RS = 0
  // output_low(LCD_RW);//RW = 0
   output_D(cX);        // Dua du lieu ra
   LCD_PulseEnable();
   delay_ms(5);
}

//#separate int1 LCD_ready ()
//{  int1 busy_flag;

  // trisc7 = 1;//set input
 //  output_low(LCD_RS);
  // output_high(LCD_RW);
  // LCD_pulseEnable();
  // busy_flag = RC7;
//   return(busy_flag);
//}
#separate void LCD_PulseEnable ( void )
{
output_high ( LCD_EN );// E = 1
delay_us ( 3 ); // was 10
output_low ( LCD_EN );
delay_ms ( 3 ); // was 5
}
////////////////////////////my lib DS1307//////////
////////////////////////////////////////////////////////////////////////////////
///                               DS1307.C                                   ///
///                     Driver for Real Time Clock                           ///
///                                                                          ///
/// ds1307_init() - Enable oscillator without clearing the seconds register -///
///                 used when PIC loses power and DS1307 run from 3V BAT     ///
///               - Disable squarewave output                                ///
///                                                                          ///
/// ds1307_set_date_time(day,mth,year,dow,hour,min,sec)  Set the date/time   ///
///                                                                          ///
/// ds1307_get_date(day,mth,year,dow)               Get the date             ///
///                                                                          ///
/// ds1307_get_time(hr,min,sec)                     Get the time             ///
///                                                                          ///
////////////////////////////////////////////////////////////////////////////////

#define RTC_SDA  PIN_B0
#define RTC_SCL  PIN_B1

#use i2c(master, sda=RTC_SDA, scl=RTC_SCL)

BYTE bin2bcd(BYTE binary_value);
BYTE bcd2bin(BYTE bcd_value);

void ds1307_init(void)
{
   BYTE seconds = 0;

   i2c_start();
   i2c_write(0xD0);      // WR to RTC
   i2c_write(0x00);      // REG 0
   i2c_start();
   i2c_write(0xD1);      // RD from RTC
   seconds = bcd2bin(i2c_read(0)); // Read current "seconds" in DS1307
   i2c_stop();
   seconds &= 0x7F;

   delay_us(3);

   i2c_start();
   i2c_write(0xD0);      // WR to RTC
   i2c_write(0x00);      // REG 0
   i2c_write(bin2bcd(seconds));     // Start oscillator with current "seconds value
   i2c_start();
   i2c_write(0xD0);      // WR to RTC
   i2c_write(0x07);      // Control Register
   i2c_write(0x80);     // Disable squarewave output pin
   i2c_stop();

}

void ds1307_set_date_time(BYTE day, BYTE mth, BYTE year, BYTE dow, BYTE hr, BYTE min, BYTE sec)
{
  sec &= 0x7F;
  hr &= 0x3F;

  i2c_start();
  i2c_write(0xD0);            // I2C write address
  i2c_write(0x00);            // Start at REG 0 - Seconds
  i2c_write(bin2bcd(sec));      // REG 0
  i2c_write(bin2bcd(min));      // REG 1
  i2c_write(bin2bcd(hr));      // REG 2
  i2c_write(bin2bcd(dow));      // REG 3
  i2c_write(bin2bcd(day));      // REG 4
  i2c_write(bin2bcd(mth));      // REG 5
  i2c_write(bin2bcd(year));      // REG 6
  i2c_write(0x80);            // REG 7 - Disable squarewave output pin
  i2c_stop();
}

void ds1307_get_date(BYTE &day, BYTE &mth, BYTE &year, BYTE &dow)
{
  i2c_start();
  i2c_write(0xD0);
  i2c_write(0x03);            // Start at REG 3 - Day of week
  i2c_start();
  i2c_write(0xD1);
  dow  = bcd2bin(i2c_read() & 0x7f);   // REG 3
  day  = bcd2bin(i2c_read() & 0x3f);   // REG 4
  mth  = bcd2bin(i2c_read() & 0x1f);   // REG 5
  year = bcd2bin(i2c_read(0));            // REG 6
  i2c_stop();
}

void ds1307_get_time(BYTE &hr, BYTE &min, BYTE &sec)
{
  i2c_start();
  i2c_write(0xD0);
  i2c_write(0x00);            // Start at REG 0 - Seconds
  i2c_start();
  i2c_write(0xD1);
  sec = bcd2bin(i2c_read() & 0x7f);
  min = bcd2bin(i2c_read() & 0x7f);
  hr  = bcd2bin(i2c_read(0) & 0x3f);
  i2c_stop();

}

BYTE bin2bcd(BYTE binary_value)
{
  BYTE temp;
  BYTE retval;

  temp = binary_value;
  retval = 0;

  while(1)
  {
    // Get the tens digit by doing multiple subtraction
    // of 10 from the binary value.
    if(temp >= 10)
    {
      temp -= 10;
      retval += 0x10;
    }
    else // Get the ones digit by adding the remainder.
    {
      retval += temp;
      break;
    }
  }

  return(retval);
}


// Input range - 00 to 99.
BYTE bcd2bin(BYTE bcd_value)
{
  BYTE temp;

  temp = bcd_value;
  // Shifting upper digit right by 1 is same as multiplying by 8.
  temp >>= 1;
  // Isolate the bits for the upper digit.
  temp &= 0x78;

  // Now return: (Tens * 8) + (Tens * 2) + Ones

  return(temp + (temp >> 2) + (bcd_value & 0x0f));
}

I hope every one will help me ! Thanks To All.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Jun 02, 2010 1:17 pm     Reply with quote
Quote:
I try but it did not work.

Tell us what you see. Give the details on how "it did not work".
tieungu13



Joined: 03 Mar 2010
Posts: 6

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PostPosted: Wed Jun 02, 2010 11:42 pm     Reply with quote
PCM programmer wrote:
Quote:
I try but it did not work.

Tell us what you see. Give the details on how "it did not work".

This is my project: time, date, sec, min ....the values did not show on the LCD.
I have a Proteus file in the folder. Please check it for me. Thanks.
http://megashare.vn/dl.php/1232346
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