Copying Code from ROM to RAM

You must implement a function that copies the code from ROM to RAM.

To place the application code at address 0x800 in ROM and copy it to address 0x7000 in RAM, implement a copy function (refer to the following listing).

Listing: Definition of the CopyCode() Function


/* Start address of the application code in ROM. */
#define CODE_SRC  0x800

/* Destination address of the application code in RAM. */

#define CODE_DEST 0x7000

#define CODE_SIZE 0x90 /* Size of the code which must be copied.*/

void CopyCode(void) {

  unsigned char *ptrSrc, *ptrDest;

  ptrSrc = (unsigned char *)CODE_SRC;

  ptrDest = (unsigned char *)CODE_DEST;

  memcpy (ptrDest, ptrSrc, CODE_SIZE);
}

The following topics are covered in this section: