Initializing a variable and specifying the storage address the same time: is it possible?

Question

In the codevision compiler for Atmel processors, there is a possibility to specify the storage address of a global variable, for example

int a @0x100; // will place the variable at the address 0x100 in RAM

Of course, as per standard C, variables can be initialized upon declaration

int a=42;

However, I did not find any possibility to do them both. int a @0x100 = 42 or int a = 42 @0x100; don't work, they cause compiler errors.

You might ask why it is so important to do it, because one could simply have

int a @0x100;

int main()
{
    a = 42;
    //...
}

However, if I have variables in the EEPROM, I need to initialize them, because this is the only way to automatically generate the eeprom file with the values in it. I can't assign those values later, because in that case it would actually write the values into the eeprom at each start of the program.

Answer 1

Just a look at CodeVisionAVR help,

"The following procedure must be used if a global variable, placed at a specific address using the @ operator, must be initialized during declaration:

/* the variable will be stored in EEPROM at address 0x10 */

eeprom int abc @0x10;

/* and it will be initialized with the value 123 */ 

eeprom int abc=123;