Best way to check if RTC DS1307 is already setup?

Forum 2005-2010 (read only) General Frequently-Asked Questions
1

Good afternoon

I'm working with DS1307. Do almost everything what I want with it, but still miss something... check if RTC is already values or is empty, like as we bought...

I'm not using any of this libraries:
DS1307RTC.h
DS1307.h

So, which is the best way to check it?
Check all the parameters, if they are as '0'... or exist any other function?

Thanks on advance
Best regards
Pedro Ferrer

2

From datasheet:
"On first application of power to the device the time and date registers are typically reset to 01/01/00 01 00:00:00 (MM/DD/YY DOW HH:MM:SS). The CH bit in the seconds register will be set to a 1."
Check registers and if date is 01/01/00 and the time less than 00:00:10 (or something similar depending how long your code is running before checking) then ds1307 not setup?

3

Good morning

Thanks by your reply.
I think that second will start counting as soon we do rtc.start... otherwise seconds remains as 0... I Think...
There no exist other way?
I've tried looking the info (01/01/00 01 00:00:00 (MM/DD/YY DOW HH:MM:SS)) on datasheet but without success...

Thanks on advance
Best regards
Pedro Ferrer