void function(void) { printf("test"); } const uint16_t addr = (uint16_t)function;
Why MDK(ARM) report an error: initializer element is not a compile-time constant ？
Because it isn't one.
But there is really only one "function" in my project!
I tried to compile this code in a minimal project, and I changed the function name and variable name, the problem remains;
But
const uint32_t addr = (uint32_t)function;
can be compiled correctly!
Maybe because it makes not really sense to store the (non constant) address of a function in a 16 or 32 bit integer variable?
My MCU flash is only 64K. I want to create a very large list of callback functions. If I use 32-bit address, obviously the upper 16 bits are meaningless.