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store a character in eeprom

 
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dynamitron



Joined: 18 Mar 2009
Posts: 38

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store a character in eeprom
PostPosted: Mon Dec 20, 2010 10:45 am     Reply with quote

Could someone explain me why if I try to store a character in eeprom, I must use the following instruction:
Code:

write_eeprom(816,78);


If I try this one, I am not getting the correct character when I read it back:
Code:

write_eeprom(816,'n');


Thanks for the help,

D.
Ttelmah



Joined: 11 Mar 2010
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PostPosted: Mon Dec 20, 2010 10:59 am     Reply with quote

Remember that 78, is the character code for 'N', not 'n'. For 'n', you would get back 110.

Best Wishes
gpsmikey



Joined: 16 Nov 2010
Posts: 588
Location: Kirkland, WA

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PostPosted: Mon Dec 20, 2010 11:03 am     Reply with quote

What are you getting back when you try to read it ? (as Ttelmah indicates, a lower case 'n' is 110 decimal (or 0x6E hex)).

mikey
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mikey
-- you can't have too many gadgets or too much disk space !
old engineering saying: 1+1 = 3 for sufficiently large values of 1 or small values of 3
dynamitron



Joined: 18 Mar 2009
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PostPosted: Mon Dec 20, 2010 11:55 am     Reply with quote

For N, I get 'B'

I am just curious because otherwise using the ascii code, it works fine
PCM programmer



Joined: 06 Sep 2003
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PostPosted: Mon Dec 20, 2010 12:09 pm     Reply with quote

Post a simple test program that shows the problem. Example:
http://www.ccsinfo.com/forum/viewtopic.php?t=17590&start=1
It should be complete and compile without errors, similar to the
program shown in the link above.

Also post your compiler version.

Also, tell us if you have ever programmed that eeprom location with
a continuous loop for a long time, and possibly burned out the eeprom.
Ttelmah



Joined: 11 Mar 2010
Posts: 19333

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PostPosted: Mon Dec 20, 2010 2:12 pm     Reply with quote

Obvious question - What chip - how much EEPROM does it have?.

Best Wishes
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