how to store 10 digit number in 8 bit eerpom

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raman00084

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i want to store 10 digit number in pic inbuilt eeprom using long integer, but i can store only 32,767 by doing the following

(long int) value=32767

(long int)low_bites=value & 0xff

(long int)high_bites= (value>>8) & 0xff

eeprom_write address_4= low_bites

eeprom_write address_5= high_bites

eeprom_read adress_4= (long int) a
eeprom_read adress_5= (long int) b
(long int) total=a+(b<<8)
lcd_print= total

by doing this i can get only 32767
how to increase to 10digit number for long int the max value is 2147483647
how to store this value how much eeprom memory i must take please send sample program

regards
kalyan
 

The internal EEPROM stores only bytes, you usually store long int (int32) in four consecutive eeprom bytes.

Many embedded C compilers have examples or built-in functions to handle numbers in EEPROM.

You previously said to use CCS C. I guess you never came across the internal_eeprom.c utility functions in the CCS C /Drivers directory?
 

hello


to store a long value (32 bits)
you need to use 4 Eeprom adresses locations !

32767 could not be a long , it could be an signed or unsigned int ..
unsigned long, Maximum value is 4294967295 = 0xFFFFFFFF


try this

Code: 
unsigned int value;
unsigned char Low_bites,High_bites;


 value=32767;  // coul be up to 65535 !
low_bites=value & 0x00ff
high_bites= (value>>8) & 0x00ff
eeprom_write address_4= low_bites
eeprom_write address_5= high_bites

be carrefull to the order to save value , when using back (Eeprom reading) with your application
LSB then MSB
or
MSB then LSB
 
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