How to write to DS1307 ?

[bianchi77]

Friends,

I tried to write to DS1307, but it's not writing properly,

I tried to write 16:01:00 Sunday,2 June 2013
but the result is
15:05:36 Sun 10 Mon 2051,

What do I miss here ?

thanks

void Write_DS1307(void)
{
	unsigned char i, hour_format;

	// Make sure we enable the Oscillator control bit CH=0 on Register 0x00
	ds1307_addr[0]=ds1307_addr[0] & 0x7F;

	// Start the I2C Write Transmission
	i2c_start(DS1307_ID,DS1307_ADDR,TW_WRITE);

	// Start from Address 0x00
	i2c_write(0x00);
   
	// Write the data to the DS1307 address start at 0x00
	// DS1307 automatically will increase the Address.
	
	ds1307_addr[0] = '0';
	i2c_write(dec2bcd(ds1307_addr[0]));//second
    _delay_ms(10);
    ds1307_addr[1] = '1';
    i2c_write(dec2bcd(ds1307_addr[1]));//minute
	_delay_ms(10);
	ds1307_addr[2] = '16';
	i2c_write(dec2bcd(ds1307_addr[2]));//hour
	_delay_ms(10);
	ds1307_addr[3] = '0';
	i2c_write(dec2bcd(ds1307_addr[3]));//day of the week
    _delay_ms(10);
    ds1307_addr[4] = '2';
    i2c_write(dec2bcd(ds1307_addr[4]));//day of the month
    _delay_ms(10);
    ds1307_addr[5] = '6';
    i2c_write(dec2bcd(ds1307_addr[5]));//month
    _delay_ms(10);
    ds1307_addr[6] = '13';
    i2c_write(dec2bcd(ds1307_addr[6]));//year
}

 

[paulfjujo]

hello,

are you using C18 ?

for the year
you put caractere '13' ;
use
ds1307_addr[6] = 13;


check also if radix=decimal or hexadecimal

or don't use Dec2bcd()
and write directly the value 0x13 in the register ...

i2c_write(ds1307_addr[6]);//year

 

[bianchi77]

hello,

are you using C18 ?

for the year
you put caractere '13' ;
use
ds1307_addr[6] = 13;


check also if radix=decimal or hexadecimal

or don't use Dec2bcd()
and write directly the value 0x13 in the register ...

i2c_write(ds1307_addr[6]);//year

Thanks mate, I'll try and let you know

- - - Updated - - -

You are right mate, thank you very much