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How to write a Char constant in the EEPROM

 
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wrsalasr



Joined: 09 Oct 2007
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How to write a Char constant in the EEPROM
PostPosted: Mon Jun 22, 2009 9:09 am     Reply with quote
Hi, I want to write a char constant name[] in the eeprom. How I can do it?? In this way does not work:
Code:

int i = 0;

char name[] = "Flux-564330";

void main() {

     for (i = 0; i < 12; i++){
          write_eeprom(i, name[i]);
          }

}


Last edited by wrsalasr on Mon Jun 22, 2009 9:44 am; edited 1 time in total
mkuang



Joined: 14 Dec 2007
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PostPosted: Mon Jun 22, 2009 9:26 am     Reply with quote
Are you using the internal EEPROM? WHich device are you using?
The CCS supported command is write_eeprom().
wrsalasr



Joined: 09 Oct 2007
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PostPosted: Mon Jun 22, 2009 9:47 am     Reply with quote
Hi, I am use the internal EEPROM of Pic16f877a
mkuang



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PostPosted: Mon Jun 22, 2009 9:51 am     Reply with quote
When you say it does not work, how do you know. Did you try reading the eeprom and sending the output to hyperterminal to see what the values are?

Also can you post your complet C program?
wrsalasr



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PostPosted: Mon Jun 22, 2009 10:28 am     Reply with quote
I am use the hiperterminal to check the read, here is my code:

Code:
#include <16f877a.h>                         
#fuses XT,NOWDT,NOPROTECT,NOLVP,PUT,BROWNOUT
#use delay(clock=20M)                     
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)

int i = 0;

char name[] = "Flux-564330";


void main() {

     for (i = 0; i < 12; i++){
          write_eeprom(i, name);
          }
       
     delay_ms(200);
     for (i = 0; i < 12; i++){
          printf ("%c",read_eeprom(i));
          }
       
}
mkuang



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PostPosted: Mon Jun 22, 2009 11:20 am     Reply with quote
And what do you see on hyperterminal? Gibberish or nothing at all?
PCM programmer



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PostPosted: Mon Jun 22, 2009 11:38 am     Reply with quote
See this thread which shows different ways to write data to eeprom:
http://www.ccsinfo.com/forum/viewtopic.php?t=32722
FvM



Joined: 27 Aug 2008
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PostPosted: Mon Jun 22, 2009 11:43 am     Reply with quote
Which code did you use? The first should work, the second can't.

In addition, using a 20 MHz crystal in XT mode shouldn't be expected to work.
Guest
PostPosted: Mon Jun 22, 2009 12:08 pm     Reply with quote
problem solved !!!
Here is the code:

Code:
#include <16f877a.h>                         
#fuses HS,NOWDT,NOPROTECT,NOLVP,PUT,BROWNOUT
#use delay(clock=20000000)                     
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)

int i = 0;

char name[] = "Flux-564330";


void main() {

     for (i = 0; i < 12; i++){
          write_eeprom(i, name[i] );
          }
       
     delay_ms(200);
     for (i = 0; i < 12; i++){
          printf ("%c",read_eeprom(i));
          }
         
   while(1);
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