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GENERAL: LOCATING POINTERS IN ROM


Information in this article applies to:

  • C166 All Versions
  • C251 All Versions

QUESTION

How do I locate pointers in ROM? When I apply const to the pointer it is still located in RAM space.

ANSWER

When you declare a pointer, there are two memory areas that you must consider: the memory space where the pointer resides and the memory space where the object pointed to resides.

To locate the pointer in ROM, you must declare is to be const. For example:

const char cc=1;            // place a constant variable in const ROM
const char *p = &cc;        // pointer in RAM that addresses const char
const char *const cp = &cc; // pointer in const ROM that addresses const
char

struct s {
  const char *p;            // a struct with a pointer to const ROM
};

struct s vs = {&cc};        // place a struct in RAM
const struct s cs = {&cc};  // place a struct in const ROM

Last Reviewed: Wednesday, July 20, 2005


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