PIC16F887 and DS1307

[menta]

I've been reading all posts here regarding the DS1307 RTC, but I really can't get it to work.
I just get the value '0' when trying to read it.
Is soething in my code is wrong ?

	RTCSec var byte		' Seconds
	RTCMin var byte		' Minutes
	RTCHour var byte	' Hours
	RTCWDay var byte	' Weekday
	RTCDay var byte		' Day
	RTCMonth var byte	' Months
	RTCYear var byte	' Year
	RTCCtrl var byte	' Control 
	SetTime var byte	' 12/24 Hour Clock
	SetSec var byte		' Seconds
	SetMin var byte		' Minutes
	SetHour var byte	' Hours
	SetDay var byte		' Day
	SetMonth var byte	' Months
	SetYear var byte	' Year
	TimeOut var word	' Variable for SetUp Menu Time-Out
RTCSec=1
RTCMin=4

I2CWRITE PORTC.4,PORTC.3,$D0,$00,[RTCSec,RTCMin,RTCHour,RTCWDay,RTCDay,RTCMonth,RTCYear,RTCCtrl]
pause 100
main:
I2CRead PORTC.4,PORTC.3,$D0,$00,[RTCSec,RTCMin,RTCHour,RTCWDay,RTCDay,RTCMonth,RTCYear,RTCCtrl]
SEROUT PORTC.6,6,[254,1]
toggle PORTD.7 : pause 1000
SEROUT PORTC.6,6,[254,128,#RTCSec]
pause 1000
goto main

[skimask]

I've been reading all posts here regarding the DS1307 RTC, but I really can't get it to work.
I just get the value '0' when trying to read it.
Is soething in my code is wrong ?

A quick search on DS1307 will get you a long way. But since your SEARCH function seems to be broken, I'll show you use mine.
http://rentron.com/PicBasic/SERLED.htm
No, this code isn't 100% perfect for what you need, but I'll bet ANYTHING that you can easily modify for your purposes.

And besides, why are you trying to set the same time that you're trying to read?
If the set time is zero and the read time is zero, then it seems to me that your program, if that is the whole program, is working correctly.

Got any pullups on the I2C lines?

[menta]

Well, i write the time, then I keep reading it, isn't it suppose to be chance every second when I keep reading it ?
pullups, you mean resistors ? I tried, then I only got 16 or 32 instead of 0

[skimask]

Well, i write the time, then I keep reading it, isn't it suppose to be chance every second when I keep reading it ?

I don't know if it's supposed to chance every second, but if the clock is running, it may change every second.

pullups, you mean resistors ? I tried, then I only got 16 or 32 instead of 0

Complete this sentence:
The value of my resistors connected to +5v and to the I2C clock and data line is __________."

[menta]

The value of my resistors connected to +5v and to the I2C clock and data line is ____10k____."

..........

[amgen]

control register may need to be set

alsoooooo....
the I2c read and write address/control string have to be different, I just used binary 00011110 (just an example) to make sure the read write is correctly coded.

don