Posted on May 17, 2011 at 09:35I need to have some variables that retain their values when the CPU is reset or powered off. I'm using the IAR dev. system, and the only way I can see to do it is by using their ''@'' and ''__no_init'' C extensions that allow you to specify an actual memory location for a variable and leave it uninitialized by the compiler. So I tried the following code:
__no_init char NonVolatile[40] @ 0x20000;
....
NonVolatile[0] = 'A';
putchar(NonVolatile[0]);
I have tried a lot of different memory addresses beside 0x20000, with the same results -- the contents of NonVolatile[0] is always a blank (32).
Can anyone tell me how to do this properly?
