Sign in to follow this  

[GBA] Problem accessing a bitmap

This topic is 4283 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Recommended Posts

I'm reading the book on JHarbour.com as well, and I just got to start working with bitmaps but I'm getting a 'multiple definition error' and I suspect it's pretty easy to solve but I don't know what's the problem. gfx2gba seems to have worked ok. I get this error on Visual Ham output window:
GBA_TEST.raw.o(.rodata+0x0): multiple definition of `GBA_TEST_Bitmap'
main.o(.rodata+0x0): first defined here

And I see these other files were created on the same directory GBA_TEST.raw.c is:
GBA_TEST.raw.i
GBA_TEST.raw.o
GBA_TEST.raw.s

This is what the code looks like:
#include <stdlib.h>
#include "GBA_TEST.raw.c"

void DrawPixel_M3(int, int, unsigned short);

#define REG_DISPCNT *(unsigned long*)0x4000000
#define MODE_3 0x3
#define BG2_ENABLE 0x400

#define SetMode(mode) REG_DISPCNT = (mode)

unsigned short* videoBuffer = (unsigned short*)0x6000000;

int main(void)
{
   int x, y;
   
   SetMode(MODE_3 | BG2_ENABLE);
   
   for(y=0; y<160; y++)
    for(x=0; x<240; x++)
        DrawPixel_M3(x, y, GBA_TEST_Bitmap[y * 240 + x]);
...
...
}

Any help will be appreciated :)

Share this post


Link to post
Share on other sites
By the looks of your code, it would seem to me that in the GBA_TEST.raw.c file the GBA_TEST_Bitmap variable is defined multiple times.

Could you post the contents of the GBA_TEST.raw.c file?

Toolmaker

Share this post


Link to post
Share on other sites
Or rather, it looks like the data is in GBA_TEST.raw.c, and since that file is compiled as well as main.o, it's defined twice.

You have two options:
1) Don't compile GBA_TEST.raw.c itself. Since it's included in main.c it'll be compiled there. This option might not be easy depending on how your Makefile is structured.
2) Don't include GBA_TEST.raw.c but GBA_TEST.raw.h in your main file. This assumes that GBA_TEST.raw.h actually exists and has the variable you want to access extern'd. Like so (example, adjust to suit):

extern u16 GBA_TEST_Bitmap[];

Share this post


Link to post
Share on other sites
Quote:
Original post by rick_appleton
Or rather, it looks like the data is in GBA_TEST.raw.c, and since that file is compiled as well as main.o, it's defined twice.

You have two options:
1) Don't compile GBA_TEST.raw.c itself. Since it's included in main.c it'll be compiled there. This option might not be easy depending on how your Makefile is structured.
2) Don't include GBA_TEST.raw.c but GBA_TEST.raw.h in your main file. This assumes that GBA_TEST.raw.h actually exists and has the variable you want to access extern'd. Like so (example, adjust to suit):

extern u16 GBA_TEST_Bitmap[];


Thanks for your replies, option #2 did the trick just great!! I hadn't thought that since GBA_TEST.raw.c is compiled as well, when I include it on 'main' it's already defined.
Thanks a lot, now I continue reading that great book while I'm supposed to be doing some DB changes here at work hehehe.

Thanks rick_appleton!

Share this post


Link to post
Share on other sites

This topic is 4283 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

Sign in to follow this