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How to write 16bit using WRITE_EXT_EEPROM( address, value );

 
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How to write 16bit using WRITE_EXT_EEPROM( address, value );
PostPosted: Wed Oct 06, 2004 10:55 am     Reply with quote
hi there.

i'm currently looking on WRITE_EXT_EEPROM( address, value );
what i want to do is store 16bit value into my eeprom.how can i do that?.
mvaraujo



Joined: 20 Feb 2004
Posts: 59
Location: Brazil

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PostPosted: Wed Oct 06, 2004 11:28 am     Reply with quote
You can save two bytes in sequence! One in each address!
Humberto



Joined: 08 Sep 2003
Posts: 1215
Location: Buenos Aires, La Reina del Plata

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PostPosted: Wed Oct 06, 2004 2:03 pm     Reply with quote
Saving each byte in sequences all you get is two consecutive bytes stored in external EEPROM,
to affect the whole number to be able to operate arithmetically you need to create a struct.

Code:


#define addr_varH              0x1000
#define addr_varL     addr_varH + 1

struct BigVar{
int8  varL;
int8  varH;
          };

union store{
long  WordValue;
struct BigVar  double_var;
           }Stuff;

// to access a byte:

    varH = read_ext_eeprom(addr_varH);
    varL = read_ext_eeprom(addr_varL);

// to write a byte:

    write_ext_eeprom(addr_varH, Stuff.double_var.H);
    write_ext_eeprom(addr_varL, Stuff.double_var.L);

// to modify the whole number:

   WordValue += 1;
 


Best wishes,

Humberto
Haplo



Joined: 06 Sep 2003
Posts: 659
Location: Sydney, Australia

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PostPosted: Wed Oct 06, 2004 6:02 pm     Reply with quote
Also take a look at CCS' official FAQ on this subject...here:

http://www.ccsinfo.com/faq/?24
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