Writing variable on DS1307 ?

[bianchi77]

Guys,

Does anyone of you have experience on wrting into DS1307 ?
Here's my issue,
Any ideas will be very appreciated,

Thanks in advance
I did :

weekday_increase = ds1307_addr[3] +1;

but when :

i2c_write(weekday_increase);

it gave me a complain :

Error	142	conflicting types for 'i2c_write'	C:\Users\Antonius\Documents\Atmel Studio\6.1\Clock_DS1307_V1_0\Clock_DS1307_V1_0\Clock_DS1307_V2_0.c	777	6	Clock_DS1307_V1_0

I supposed to be able on writing it directly,
The function ,

char i2c_write(char data)
{
	unsigned char twi_status;
	char r_val = -1;

	// Send the Data to I2C Bus
	TWDR = data;

	// Transmit I2C Data
	twi_status=i2c_transmit(I2C_DATA);

	// Check the TWSR status
	if (twi_status != TW_MT_DATA_ACK) goto i2c_quit;

	r_val=0;

	i2c_quit:
	return r_val;
}

it works allright when I do :

ds1307_addr[0] = 0x00;
	i2c_write(ds1307_addr[0]);//second

Perhaps I need to convert :

weekday_increase = ds1307_addr[3] +1;

but I defined it already

char weekday_increase;

Do you guys have any clues ?
Thanks in advance....

Have a good day

 

[andre_luis]

I guess you must declare weekday_increase with same type was declared at ds1307_addr[] (=char)

+++

 

[Golden Electronics]

here char =>weekday_increase
so ds1307_addr[3] must be char if it any other change it

 

[bianchi77]

it's a char already

char ds1307_addr[7];
char weekday_increase;

What do I miss here ??

 

[andre_luis]

it's a char already
What do I miss here ??

Pehaps you did´t gave us exactly what is happening.
Try perform a step-by-step debug, line by line, from working program up to the desired.


+++

 

[Golden Electronics]

post details before try for unsigned char it may possible if date range over.