Hi,
Once I remapped the memory in bellow mentioned way. Your approach is good because it takes only 2KB from nonpaged memory 4000. My approach takes 4KB from this memory because I placed an EEPROM there. Moreover, I would like to present some facts to be taken into account in the CodeWarrior environment.
Some comments to your setup:
OK; INITEE 0x01 EEPROM mapped to 0x0000 - 0x0xFFF (4kB) and enabled
OK; INITRM 0x39 RAM mapped to 0x1000 - 0x3FFF (12kB) and high-aligned ( first block selected, up alligned)
comment: the same is INITRM 0x01 RAM mapped to any 16 k block 0x1000 - 0x3FFF (12kB) and high-aligned
OK; INITRG 0x40 Registers mapped to 0x4000 - 0x4800 (2kB) 0x4000 - 0x43FF
comment: the RAM occupies only 1K so it is mapped at 0x4000 - 0x43FF
The project representing my setup is attached. It is made for the compatible MCU with the same memory map. The main facts are highlighted bellow.
1) main.c module
//The Memory is remapped in following way
//
//- Registers : 0000~03FF
//- RAM : 1000~3FFF
//- EEPROM : 4000~4FFF
//- Unpaged flash : 5000~7FFF, C000~FFFF
//- Paged flash : 0x(30~3F)(8000~BFFF)
//
//Remapping is made in the file Start12.c before Init() function is called.
//(Init() function is automatically generated by CodeWarrior to initialize variables)
//
//
// //-----------------------------------
// folowing lines are placed inside Start12.c to define memory map (line 413)
// *(unsigned char*)0x11 = 0x00; // INITRG = 0x00; Set the Reg map position 0x0000~0x03FF
// asm nop; // recommended
// *(unsigned char*)0x10 = 0x01; // INITRM = 0x01; Set the RAM map position 0x1000~0x3FFF
// *(unsigned char*)0x12 = 0x41; // INITEE = 0x41; Set the EEPROM map position 0x4000~0x4FFF, EEON=1
// //------------------------------------
//
// Also *.prm file must be adjusted to meet these changes. (See line 11 and 18 in the prm file)
2) PRM file lines 11-18:
__EXTERN_C void _Startup(void) {
#endif
/* purpose: 1) initialize the stack
2) initialize the RAM, copy down init data etc (Init)
3) call main;
parameters: NONE
called from: _PRESTART-code generated by the Linker
or directly referenced by the reset vector */
*(unsigned char*)0x11 = 0x00; // INITRG = 0x00; Set the Reg map position 0x0000~0x03FF
asm nop; // recommended
*(unsigned char*)0x10 = 0x01; // INITRM = 0x01; Set the RAM map position 0x1000~0x3FFF
*(unsigned char*)0x12 = 0x41; // INITEE = 0x41; Set the EEPROM map position 0x4000~0x4FFF, EEON=1
3) PRM file changes:
/* Register space */
/* IO_SEG = PAGED 0x0000 TO 0x03FF; intentionally not defined */
/* EPROM */
// EEPROM = READ_ONLY 0x0400 TO 0x0FEF;
EEPROM = READ_ONLY 0x4000 TO 0x4FEF;
/* RAM */
RAM = READ_WRITE 0x1000 TO 0x3FFF;
/* non-paged FLASHs */
// ROM_4000 = READ_ONLY 0x4000 TO 0x7FFF;
ROM_4000 = READ_ONLY 0x5000 TO 0x7FFF;
Please look into attachment to check it.
Best regards,
Ladislav
