A problem with bluemsx

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By sp4

Master (214)

sp4's picture

20-01-2015, 20:55

Hi I wrote this code below:

app.c

#include "graphic.h"
#include "cio.h"
//#include 
//#include 
//#include "sound.h"


void f()
{
   color(1,15,6);
   screen(2);
   pset(10,10);
}

int i=23;

int main() {
	  void (*f)() = (void (*)())0xc0;
    f();
	  while(1){};
}

and this is my comp.bat:

sdasz80 -o crt0msxrom.o crt0msxrom.s
sdcc -mz80 --no-std-crt0 -S -o app.asm app.c graphic.rel cio.rel
sdasz80 -o app.o app.asm
sdldz80 -nf "link.lnk"
hex2bin 8000 linkresult.ihx
copy linkresult.bin ROM.ROM

this is graphic.c:

#include "graphic.h"

void color(char fg, char bg, char bd){
  _asm

  ld hl,#0xf3e9
  ld a,4(ix)
  ld (hl),a

  inc hl
  ld a,5(ix)
  ld (hl),a

  inc hl
  ld a,6(ix)
  ld (hl),a

  call 0x0062 ; --- change color

  _endasm;
}

void pset(unsigned char x, unsigned char y)
{
  __asm
       ld h, 4(ix)
       ld l, 5(ix)
       call #0x006D    ; ---> BIOS call for design a pixel in the screen
  __endasm;
}

/*
void paint(unsigned char x, unsigned char y)
{
  __asm
  {
       ld h, 4(ix)
       ld l, 5(ix)
       call #0x0069    ; ---> BIOS call for color the screen
  }
}


char vpeek(int address){
  _asm
   {
      ld l,4(ix)
      ld h,5(ix)
      call #0x004A         ;BIOS call for read a VRAM value
      ld h,#0x00
      ld l,a
   }
}

void vpoke(int address, char value){
  _asm
  {
      ld l,4(ix)
      ld h,5(ix)
      ld a,6(ix)
      call #0x004D         ;BIOS call for write a VRAM value
  }
}
 */

graphic.h:

//begin of graphic.h

void color(char fg, char bg, char bd);
void pset(unsigned char x, unsigned char y);
void paint(unsigned char x, unsigned char y);
char vpeek(int address);
void vpoke(int address, char value);


//end of graphic.h

this is cio.c:

//module for input and output functions
#include "cio.h"
#include 
#include 


//function for erase the screen
void cls(void)
{
  putchar(0x1b);
  putchar(0x45);
}

//function for input one character in the screen
void putchar(char chr)
{
  __asm
    ld a, 4(ix)   ;reg for display the caracter
    call 0x00A2  ;BIOS call for display the caracter
  __endasm;
}


//function for print a string in the screen
void print(char *string)
{
   printf(*string);
}


//function for read one caracter from the keyboard
char inkey(void)
{
  __asm
    call 0x009F   ;BIOS call to read a keyboard caracter
    ld h,#0x00
    ld l,a      ;reg to put a readed caracter
  __endasm;
}

//function for put the cursor in the x and y coordinates
void locate(char x,char y)
{
  __asm
    ld l,4(ix)  ;put the coordinate x in the reg l
    ld h,5(ix)  ;put the coordinata y in the reg h
    call 0x00C6 ;BIOS call to move the corsore
  __endasm;
}

//function for move only the row position in the screen
void tab(char x)
{
   __asm
    ld l, 4(ix)  ;put the x coordinate in the reg l
    call 0x00C6 ;BIOS call for move the cursore
   __endasm;
}

//function for input one caracter with eco
void input(char var)
{
    var=inkey();
    putchar(var);
}

//function for set the mode screen
void screen(unsigned char mode)
{
  __asm

  ld a,4(ix)
  call 0x005F ; --- go to screen mode
  call 0x00CC ; --- erase function keys

  __endasm;
}

this is cio.h:

//cio.h header file

void cls(void);
void putchar(char chr);
void print(char *string);
char inkey(void);
void locate(char x,char y);
void tab(char x);
void input(char var);
void screen(unsigned char mode);


//end of cio.h

I used the follow file link.lnk:

--
-m
-j
-x
-i linkresult
-b _CODE = 0x4000
-b _DATA = 0xc000
-k D:\MSX\SDCC\bin\z80.lib
-l z80.lib
crt0msxrom.o
app.o


-e

and I used also the follow file asm crt0msxrom.s:


.module crt0
       	.globl _main
	.globl _romheader
	.globl _runrom

	.area	_CODE
_romheader:
	.db 0x41
	.db 0x42
	.dw _runrom
	.dw 0,0,0,0,0,0,0,0
_runrom:
        call    gsinit
	call	_main
	ret

	;this is ordered by first occurence in first file passed to linker?
	;note _CODE already has been mentioned in this file.
	
	;; Ordering of segments for the linker.
	.area	_HOME
	.area	_CODE
        .area   _GSINIT
        .area   _GSFINAL

	.area	_DATA
	.area	_BSEG
        .area   _BSS
        .area   _HEAP

;sdcc does init global variables from code in _GSINIT areas
        .area   _GSINIT
gsinit:: ;double colon:: makes label global (asxhtm.html)

        .area   _GSFINAL
        ret

When I compiled and I executed ROM.ROM with bluemsx I didn' t see a pixel in the screen.
Nobody can tell me why please?

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By Manuel

Ascended (19270)

Manuel's picture

20-01-2015, 21:10

Why on earth do you think it's related to blueMSX? Did you try it on a real MSX?

By sp4

Master (214)

sp4's picture

20-01-2015, 21:54

No I' ve never try on a real MSX.

By Daemos

Paragon (2044)

Daemos's picture

20-01-2015, 21:57

Quote:

When I compiled and I executed ROM.ROM with bluemsx I didn' t see a pixel in the screen.
Nobody can tell me why please?

Please check your rom with a hexeditor and confirm there is data in it. Perhaps you are facing the same problems again. This has nothing to do with bluemsx. These class of emulators are as close as one can get to a real machine and even if there is a difference your program should at least start.

So confirm step by step whats going on. Make sure the ROM has data, then make sure the ROM has a valid header. Then confirm in a debugger the actual program starts. Then debug the main program. It is not the emulators fault.

By Manuel

Ascended (19270)

Manuel's picture

20-01-2015, 21:58

Then you shouldn't make this topic sound like it's the emulator's fault... This is (most likely) not a problem with blueMSX, but a problem with your program.

By Vampier

Prophet (2409)

Vampier's picture

21-01-2015, 04:07

Manuel now you need to solve it for Mr. Ag too Big smile

By sp4

Master (214)

sp4's picture

21-01-2015, 13:33

Daemos wrote:
Quote:

When I compiled and I executed ROM.ROM with bluemsx I didn' t see a pixel in the screen.
Nobody can tell me why please?

Please check your rom with a hexeditor and confirm there is data in it. Perhaps you are facing the same problems again. This has nothing to do with bluemsx. These class of emulators are as close as one can get to a real machine and even if there is a difference your program should at least start.

So confirm step by step whats going on. Make sure the ROM has data, then make sure the ROM has a valid header. Then confirm in a debugger the actual program starts. Then debug the main program. It is not the emulators fault.

This is my ROM.ROM:

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

I see than there are "AB@ " in the begin so should run without problem: inded I hear a beep
but I cant see the pixel in the screen.

By sp4

Master (214)

sp4's picture

21-01-2015, 13:44

OK Daemos can you tell me where is the problem in my code please ?
Maybe in the app.c, in graphic.c or in cio.c ?
screen() maybe wrong or maybe pset() ?

By Daemos

Paragon (2044)

Daemos's picture

21-01-2015, 13:54

Have you checked with the debugger that the program actually starts. I see AB@ and some stuff but the rest of the ROM looks pretty empty. I have no knowledge of C so I can't help you with your program. The debugger can help you however by showing you whats happening step by step.

First find out your startadress. When you start your debugger pauze the enulator and look at address $4000 you will see AB the following two bytes are the start adress of your program like $40xx set a breakpoint at that address and then when the emulator gets to that point go step by step through the code and see what happens.

By hit9918

Prophet (2927)

hit9918's picture

21-01-2015, 14:17

oh @sp4, I mentioned earlier, functions like pset() in graphics.c dont work.
And this is no more about the other problems to get things to run,
they say "bios call", but they aren't.
In the other thread I posted a pset() demo, did you try?

By Manuel

Ascended (19270)

Manuel's picture

21-01-2015, 15:02

Looks like these 'calls' are actually subROM routines for MSX-BASIC:

; $0069 PAINT   (BASIC)
; $006D PSET    (BASIC)
; $0071 ATRSCN  (BASIC)
; $0075 GLINE   (BASIC)
; $0079 DOBOXF  (BASIC)
; $0081 BOXLIN  (BASIC)
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