Atomic operations

Alex,

When the CPU enters the ISR interrupts are disabled.  They will only be enabled again when you enable them or when you exit the ISR and the context restores.

-Lori

Thank you for reply.

The problem is when i check my software flag in main cycle i can get wrong value, cause checking process can be interrupted. So, check process should be an atomic operations.

It seems to me that it's not good to disable interrupts in some cases( e.g. when you check flag in main cycle ). Cause interrupts will be disabled too much time.

//in main()

while(1) {

DINT;

if( f_some_flag == 0xAABB ){

    EINT;

    do_smth();

}

EINT;

}