read and write float values eeprom [ccs c compiler]

[armghan11]

here is the program i am using to read and write 8bit values.... but how can i read and write float values in eeprom

#include <16F877A.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#rom 0x2100 = { 7, 39 }
#include <lcd2.c>

void main() {
   int8 value,value1;
   lcd_init();
   value = read_eeprom (0x2100);
   value1= read_eeprom (0x2101);
   delay_ms(6);
   lcd_gotoxy(1,1);
   printf(lcd_putc,"Hammad Armghan");
   lcd_gotoxy(1,2);
   printf(lcd_putc,"D1=%u",value);
   lcd_gotoxy(9,2);
   printf(lcd_putc,"D2=%u",value1);
   
   
   
   while(TRUE)
   {
   
   
   
   }
}

 

[jayanth.devarayanadurga]

If the float is 4 bytes write 4 bytes to eeprom

 

[iukhan]

The following is an example of how to read and write a floating point number from/to EEPROM.

n is an offset into the EEPROM.
For floats you must increment it by 4.
For example, if the first float is at 0, the second one should be at 4, and the third at 8.

WRITE_FLOAT_EXT_EEPROM( long int n, float data) {
int i;
for (i = 0; i < 4 ; i++)
write_ ext_ eeprom(i + n, *(((int 8 *)&data + i) ) ;
}

float READ_FLOAT_EXT_EEPROM( long int n) {
int i;
float data;
for (i = 0; i < 4; i++)
*(((int 8 *)&data) + i) = read_ ext_ eeprom(i + n);
return(data);
}

 

[jayanth.devarayanadurga]

He is referring to internal eeprom.

 

[armghan11]

He is referring to internal eeprom.

yes i am talking about internal eeprom... can u give me some example? it would be great thanks

 

[jayanth.devarayanadurga]

Check these links http://www.ccsinfo.com/forum/viewtopic.php?p=122263
http://www.ccsinfo.com/faq.php?page=write_eeprom_not_byte
http://dc96.4shared.com/doc/W4O4mDvs/preview.html

In the third link it refers to the file INTERNAL_EEPROM.C. Check that file in the CCS C examples folder.

I think you can use the code given by iukhan. You have to modify it for internal eeprom. After all it is nothing but writing data of different sizes to some memory locations.