mc9s08rd32dwe move the stack

[jah]

HI:

how do i move the stack to a new ram location?
where is it declared loaded?

thanks!

[peg]

Hi jah,

The answer is by writing to the Stack Pointer Register.

It defaults to $00FF.

Usually use TXS as in:

*********** Move Stack to top of RAM ****************************************

  LDHX #RamLast+1  ;point to 1 past end of RAM
  TXS    ;SP<-(H:X-1)

If the question was, How do I do this in Codewarrior? please post in the Codewarrior Forum.

Regards

David

[admin]

Here's an example of a .prm file:

Code:

/* This is a linker parameter file for the QB4 */NAMES END /* CodeWarrior will pass all the needed files to the linker by command line. But here you may add your own files too. */SEGMENTS /* Here all RAM/ROM areas of the device are listed. Used in PLACEMENT below. */    Z_RAM                  = READ_WRITE   0x0080 TO 0x00DF;    STACK0                 = READ_WRITE   0x00E0 TO 0x00FF                             FILL 0xAA;    ROM                    = READ_ONLY    0xEE00 TO 0xFDFF;    ROM1                   = READ_ONLY    0xFFB0 TO 0xFFBD;    ROM2                   = READ_ONLY    0xFFC2 TO 0xFFCF;ENDPLACEMENT /* Here all predefined and user segments are placed into the SEGMENTS defined above. */    DEFAULT_ROM,    ROM_VAR,    STRINGS                INTO  ROM; /* ROM1,ROM2 In case you want to use ROM1,ROM2 as well, be sure the option -OnB=b is passed to the compiler. */    FAR_RAM,    _DATA_ZEROPAGE,    MY_ZEROPAGE,    DEFAULT_RAM            INTO  Z_RAM;    SSTACK                 INTO  STACK0;END/* STACKSIZE 0x20 */STACKTOP                   0x00FFVECTOR 0 _Startup /* Reset vector: this is the default entry point for an application. */

 
The lines you need to be concerned about are:

"Stack0..." define you stack space

"SSTACK" tell the linker where your stack space is

"STACKTOP"  where the stack pointer will start.

Hope this helps,

Tomahawk

[jah]

thanks Tomahawk

[Lundin]

Check the .prm file and the CW manual.