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how to use eeprom read and write commands..any one help me.

 
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karti.m



Joined: 07 Jul 2011
Posts: 5

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how to use eeprom read and write commands..any one help me.
PostPosted: Sat Dec 17, 2011 5:22 am     Reply with quote
Actually I want to save the value of a variable at the instant of power failure. Again when power came the stored value must read from memory and used for output.

Code:

write_EEPROM(add,inc1);
write_EEPROM(add1,dec1);
l= read_EEPROM(add1);
m= read_EEPROM(add);

I used this in my coding but its not working.
It returns only 0.
bkamen



Joined: 07 Jan 2004
Posts: 1611
Location: Central Illinois, USA

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PostPosted: Sat Dec 17, 2011 1:17 pm     Reply with quote
We need to know more than this.

Give us a FULL but SMALL example we can compile.

Include in your reply the version of compiler.

Your example should include the device as without that info, we can't tell if your device even has EEPROM...


-Ben
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Ttelmah



Joined: 11 Mar 2010
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PostPosted: Sat Dec 17, 2011 4:00 pm     Reply with quote
Also, how are you detecting that power has failed?.
At what voltage?.
How long will power still be high enough to support the EEPROM write operation after this?.

Best Wishes
karti.m



Joined: 07 Jul 2011
Posts: 5

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regarding eeprom
PostPosted: Mon Dec 19, 2011 10:04 am     Reply with quote
am using pic16f873a,its a 5V device...
PCM programmer



Joined: 06 Sep 2003
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PostPosted: Mon Dec 19, 2011 2:06 pm     Reply with quote
Here are some threads that discuss saving data to eeprom before power-down:
http://www.ccsinfo.com/forum/viewtopic.php?t=44144
http://www.ccsinfo.com/forum/viewtopic.php?t=25733
http://www.ccsinfo.com/forum/viewtopic.php?t=46723
http://www.ccsinfo.com/forum/viewtopic.php?t=30706
http://www.ccsinfo.com/forum/viewtopic.php?t=37757
karti.m



Joined: 07 Jul 2011
Posts: 5

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PostPosted: Tue Dec 20, 2011 10:21 am     Reply with quote
thanx a lot for ur links...
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