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How can I write a string on eeprom?

 
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memoally



Joined: 25 Jan 2010
Posts: 35

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How can I write a string on eeprom?
PostPosted: Mon Feb 22, 2010 12:51 pm     Reply with quote
Hi everyone. I want to write a string on eeprom, then print that data on
an lcd, but I dont know how to do. I want to write:
Quote:

M929 y-4/1
B:||||

also combinations like this. But these writings are not variables, only
writings for several cases. (e.g if x=1 print M929 , if x=2 print M939....).
Should the data to be written on eeprom be variables? I tried to use:
Code:

lcd_init();

lcd_gotoxy(1,1);
write_eeprom(0, M929);
printf(lcd_putc, read_eeprom(0));

lcd_gotoxy(6,1);
write_eeprom(1, y-4/1);
printf(lcd_putc, read_eeprom(1));

lcd_gotoxy(1,2);
write_eeprom(2, B:||||);
printf(lcd_putc, read_eeprom(2));

But it does not work. Can anyone correct me or give me an advice to
write a string on eeprom and that shows it on an lcd. If there is an
example code, please share with me.

There is also one more question, I don't know how many bytes are used
by a string. I have 20 writings like above and I use 16f876 which has 256
bytes eeprom. Is this memory enough for this job?
_________________
compiler version: 4.105
pic: 16f876
clock frequency: 4MHz
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Feb 22, 2010 4:51 pm     Reply with quote
Do you need to write to the eeprom at run-time with write_eeprom()
(as shown in your code) ? If so, this thread has sample code:
http://www.ccsinfo.com/forum/viewtopic.php?t=29309

Or, do you only need to put the strings into eeprom when the PIC is
programmed by the ICD programmer ? Then you can use the #rom
statement to put the strings into eeprom.
memoally



Joined: 25 Jan 2010
Posts: 35

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PostPosted: Tue Feb 23, 2010 4:47 pm     Reply with quote
Sorry for late answer and also thank you, pcm programmer. It was not mandatory to use eeprom but I think it was the best choice for the work. Anyway, I solved the problem by using alternative ways Smile Thank you again...
_________________
compiler version: 4.105
pic: 16f876
clock frequency: 4MHz
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