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Message |
Joseph88
Joined: 14 Aug 2006
Posts: 17
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| Write String to EEPROM? |
 Posted: Thu Dec 28, 2006 11:00 am |
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Can someone give me an example on how i would write a text string to eeprom?
I've been trying what's described below but it won't compile. I'm using the 18f4525
char result[6]="hello"
void main{
write_eeprom(0x00,&result);
result = read_eeprom(0);
printf("eeprom info:%x", result);
}
Thanks and Happy Holidays.
Joe |
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Ttelmah
Guest
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| Posted: Thu Dec 28, 2006 11:20 am |
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write_eeprom, transfers just one byte. You need:
| Code: |
write_string(int8 address, int8 string[])
{
int8 ctr=0;
do{
write_eeprom(address++, string[ctr]);
}while (string[ctr++] != 0);
}
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This writes the bytes from the string up to, and including the terminating null.
You would need a similar retrieval function to get the data back.
Best Wishes |
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Joseph88
Joined: 14 Aug 2006
Posts: 17
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| Posted: Thu Dec 28, 2006 11:25 am |
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| Thanks for your reply. Would you need to do the same procedure to read back what you've written to eeprom? |
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Ttelmah
Guest
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| Posted: Thu Dec 28, 2006 4:11 pm |
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| Yes. Last line of my reply... |
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Joseph
Guest
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| Posted: Thu Jan 04, 2007 1:32 pm |
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I'm trying to save some info into memory, then read them back to print them onto a LCD. The problem that i'm having is that the "hello" that is printed on the LCD has 4 additional gibberish characters added onto the end. Any help will be appreciated.
| Code: |
char lcdText[16]="hello";
void write_string(int8 address, int8 string[]) {
int8 ctr=0;
while (string[ctr]!=0){
write_eeprom(address++,string[ctr]);
ctr++;
}
}
void read_string(int8 address, char lcdText) {
int i =0;
char string[8];
for (i=0; i<=strlen(lcdText)-1; i++){
string[i]=read_eeprom(address++);
}
printf(lcd_putc, "%s", string);
} |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Jan 04, 2007 1:38 pm |
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You're not terminating the string when you read it from eeprom.
You've only got the text. You need to append a 0x00 byte at the end
of the text. |
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Guest
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| Posted: Thu Jan 04, 2007 1:53 pm |
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| Thanks PCM, that did the trick. |
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