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my prx doesn't printf

 
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rus_pa



Joined: 07 Jan 2008
Posts: 13
PostPosted: Sun Feb 03, 2008 4:54 am    Post subject: my prx doesn't printf Reply with quote
hy, I just managed to compile & load successfully a prx :D (got troubles.. anyway)
I exported some functions, the first returns an integer, another writes to screen a junkie text.

calling from the main program, the first writes my integer to screen, the second doesn't do anything, seems to just skip.

the prx code is this

Code:

#include <pspsdk.h>
#include <pspkernel.h>
#include <pspdisplay_kernel.h>
#include <stdio.h>
#include <pspdebug.h>
#include <pspdisplay.h>
#include <pspctrl.h>
#include <stdio.h>
#include <string.h>

PSP_MODULE_INFO("myLib", 0x1006, 1, 1);
PSP_MAIN_THREAD_ATTR(0);

u32 k1;

void write_me(int number){
    k1 = pspSdkSetK1(0);
    printf("(%d)",number);
   
//next line blows up the compile :P   
//pspDebugScreenPrintf("(%d)", number);
   
    pspSdkSetK1(k1);
}

int module_start(SceSize args, void *argp)
{
    printf("PRX module starting...\n");
   return 0;
}

int module_stop()
{
   return 0;
}

int give_me(){

    return 5;
}


neither the "module starting..." is displayed.
Why?
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Hellcat



Joined: 24 Jan 2007
Posts: 84
PostPosted: Sun Feb 03, 2008 10:59 pm    Post subject: Re: my prx doesn't printf Reply with quote
rus_pa wrote:
//next line blows up the compile :P
//pspDebugScreenPrintf("(%d)", number);

Because you can't link user functions into kernel mode modules.
Make your kernel PRX return the value to the usermode PRX and output it from there.

I currently don't know how the standard C "printf" is defined on the PSP, but you need to call pspDebugScreenPrintf() to output anything.
Don't forget to init the debug screen first!
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PSPfreak!



Joined: 14 Nov 2007
Posts: 34
PostPosted: Tue Feb 05, 2008 8:37 pm    Post subject: Re: my prx doesn't printf Reply with quote
Hellcat wrote:

I currently don't know how the standard C "printf" is defined on the PSP, but you need to call pspDebugScreenPrintf() to output anything.
Don't forget to init the debug screen first!


isnt it
Code:
#define printf  pspDebugScreenPrintf

printf("blah blah blah");
/*prints blah blah blah to the psp screen*/


that works??, isnt that how its defined? or were you meaning something else? lol
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jean



Joined: 05 Jan 2008
Posts: 489
PostPosted: Tue Feb 05, 2008 8:46 pm    Post subject: Reply with quote
Quote:
isnt it ...

Yeah....rus_pa didn't quoted it from its source, but i guess it was understood. Anyway, even if printf was defined, initialized and allowed in a kernel prx like that, it's not a good practice to use it that way... return a string and do whatever you want with it in your usermode code
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