PSP Programming Tutorials

ok...what I want to know is how would I handle the buttons.

Code:

---

SceCtrlData pad;
sceCtrlReadBufferPositive(&pad, 1);
if (pad.Buttons & PSP_CTRL_CROSS){
    printf("Hello");
}

---

This would make it so that if CROSS is pressed(indluding being held down) then it will do that. I want it so that if I were to press CROSS it would only have enough time to do it once, and then it wont do it again unless I were to press CROSS again. ex) in shooting games; for a pistol, you would only want it to shoot once if you pressed it...not shoot repeatedly as long as you hold the button down. I want something similar to that. Hopefully someone understands what I mean and can help

Zitat:

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Zitat von Ravine

What I think you could do, well two things. First, if you want a scrolling background, make a premade "map" and make sure it is bigger than the psp screen. Then display that picture, and draw your "character's" image next. Now for what I think would make it scroll, just to let you know this is not tested but does not seem to hard to code. When the character gets to 10 pixles from that side of the screen, move the "map" imagea little bit towards the opposite direction the character is walking. If you just want to make it so you have a plain image that fits the screen as the background, tiled would be a little different (if it is one smaller image, you could tile it like it as done in the tutorial). So just load that "map" image that fits the screen and load everything that goes on top of it after the "map" image is displayed. I haven't looked into it much but in the graphics.h file there is a function defined that draws an image to an image. You could work with it that way also, that would seem more likely to work than just drawing the images in order of them being displayed.

Now for writing text, right now I'm not at my compuer where I can see the exact function, but once again it is in the graphics.h file. It is something ike disableGraphics() You have to do that first so it will not think that you are drawing an image. Then you can do a printf() or you can use the print command in the graphics.h file. Then to start drawing again reinitalize te graphics like you did the first time. There is also a function that is drawTextToImage() which, well does what it says, you can see the parameters in the graphics.h file.

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I hate to complain but the small pic on the big one thing didn't I understand. And for writing text: The disableGraphics() doesn't work (you can't even see the text flash by...) and the compiler doesn't recoginze the drawTextToImage() command. Anyone?

You could use a pause command. Although, I'm not sure what it is really named.

Zitat:

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Zitat von SodR

I hate to complain but the small pic on the big one thing didn't I understand. And for writing text: The disableGraphics() doesn't work (you can't even see the text flash by...) and the compiler doesn't recoginze the drawTextToImage() command. Anyone?

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void printTextScreen(int x, int y, const char* text, u32 color)

void printTextImage(int x, int y, const char* text, u32 color, Image* image)

Zitat:

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Zitat von Psilocybeing

void printTextScreen(int x, int y, const char* text, u32 color)

---

Where should I put the text in this command??

(I'm Sorry to ask such a noob question...)

const char* defines a pointer to a character array, so here is an example of how you would use it.

printTextScreeen(10, 20, "This is a test string", RGB(255,0,0));

note: you need RGB defined in the headers, as it states in tutorial 4.

Slasher, You would have to use a break button command like so

if break(pad.buttons & PSP_CTRL_CROSS) {
printf("Hello");
}

sorry but break doesnt work... error: syntax error before 'break'

break is not a function. You use break to stop the processing of a while.. loop. Atleast I think it is not a command. Also if it says before break, that means exactly that the error is before break. :-p Probably:
if (break(pad.Buttons & PSP_CTRL_CROSS)){
printf("Hello PSP!");
}
would work, that is, if break is a function. That would be a reason it says error before break.

Very sorry, My mistake

How would I use audio in my program? I looked one google and found sceAudio. Are any of those functions documented?

Hey, great tutorial, very easy to understand for a C noob like me...

I'm falling at the first hurdle, trying to get the toolchain working/compiled/whatever its called. What the heck does this error mean?

I've tried to run it about 3 times now, once on a clean cygwin folder, again over the half-cooked config that errored out as attached, and again, just now, after deleting and copying the toolchain folder again. Same error each time.

Help :(

http://www.gadgetlover.net/psptoolchain.PNG

I can't make heads or tails out of how to use the analog stick in a program. I looked at every post in this thread that talks about it, and I looked at the samples for it in the PSPSDK folder, but I still somehow can't get it to work. I wrote a simple program that would just say stuff liek "analog up" "analog down" etc when the corresponding direction is pressed, but they never work, its like the PSP just doesn't know that the analog stick is being moved about. I tried taking this code that Psilocybeing posted:

SceCtrlData pad;

sceCtrlSetSamplingCycle(0 );
sceCtrlSetSamplingMode(PS P_CTRL_MODE_ANALOG);
sceCtrlReadBufferPositive (&pad, 1);

if (pad.Lx == 255){
cursorPosX = cursorPosX+8;
}
if (pad.Lx == 0){
cursorPosX = cursorPosX-8;
}

if (pad.Ly== 255){
cursorPosY = cursorPosY+8;
}

if (pad.Ly == 0){
cursorPosY = cursorPosY-8;
}

and replacing all the cursorpos things to just say printf, but for some reason its not working. And of course this code was in the main part of my program, with everything else included.

PS when I get all this sorted out, I also was wondering how to use directionals on the analog stick, perhaps something to the effect of:
if(pad.Ly == 0 && pad.Lx == 255){ ...

?
Thanks in advance for any help

#include <pspctrl.h>

Try that at the top. Let me know if that works. If it doesn't then you may need to include some other header files, im not sure which ones exactly though.

this is the code that I have been trying and doesn't work. I think it might need a while loop, but I just based this off of what Psilocybeing said in a previous post.

Code:

---

#include <pspkernel.h>
#include <pspdebug.h>
#include <pspdisplay.h>
#include <pspctrl.h>
#include <stdlib.h>
#include <string.h>

PSP_MODULE_INFO("Analog Stick", 0 , 1 , 1);


#define printf pspDebugScreenPrintf //makes typing easier


/* Exit callback */
int exit_callback(int arg1, int arg2, void *common) {
                sceKernelExitGame();
                return 0;
}

/* Callback thread */
int CallbackThread(SceSize args, void *argp) {
                int cbid;

                cbid = sceKernelCreateCallback("Exit Callback", exit_callback, NULL);
                sceKernelRegisterExitCallback(cbid);

                sceKernelSleepThreadCB();

                return 0;
}

/* Sets up the callback thread and returns its thread id */
int SetupCallbacks(void) {
                int thid = 0;

                thid = sceKernelCreateThread("update_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
                if(thid >= 0) {
                                sceKernelStartThread(thid, 0, 0);
                }

                return thid;
}

int main() {

  SceCtrlData pad;

sceCtrlSetSamplingCycle(0  );
sceCtrlSetSamplingMode(PSP_CTRL_MODE_ANALOG);
sceCtrlReadBufferPositive  (&pad, 1);

if (pad.Lx == 255){
        printf ("analog right\n");
}
if (pad.Lx == 0){
        printf("analog left\n");
}

if (pad.Ly== 255){
        printf("analog down\n");
}

if (pad.Ly == 0){
        printf("analog up\n");
}
  sceKernelSleepThread();

  return 0;

}  // end main

---

Zitat:

---

Zitat von soccerPMN

I can't make heads or tails out of how to use the analog stick in a program. I looked at every post in this thread that talks about it, and I looked at the samples for it in the PSPSDK folder, but I still somehow can't get it to work. I wrote a simple program that would just say stuff liek "analog up" "analog down" etc when the corresponding direction is pressed, but they never work, its like the PSP just doesn't know that the analog stick is being moved about. I tried taking this code that Psilocybeing posted:

SceCtrlData pad;

sceCtrlSetSamplingCycle(0 );
sceCtrlSetSamplingMode(PS P_CTRL_MODE_ANALOG);
sceCtrlReadBufferPositive (&pad, 1);

if (pad.Lx == 255){
cursorPosX = cursorPosX+8;
}
if (pad.Lx == 0){
cursorPosX = cursorPosX-8;
}

if (pad.Ly== 255){
cursorPosY = cursorPosY+8;
}

if (pad.Ly == 0){
cursorPosY = cursorPosY-8;
}

and replacing all the cursorpos things to just say printf, but for some reason its not working. And of course this code was in the main part of my program, with everything else included.

PS when I get all this sorted out, I also was wondering how to use directionals on the analog stick, perhaps something to the effect of:
if(pad.Ly == 0 && pad.Lx == 255){ ...

?
Thanks in advance for any help

---

The problem with your code is that you're expecting exactly 0 and 255 out of the analog stick. Analog and exact values don't mix. What you want to do scale the cursor movement according to how far out of center the stick is. If you don't care about real analog control then use threshold values and test if the control is greater than or less than the thresholds.

A good way to see what exactly is going on is to print the current value of Lx and Ly and play around with the stick to see what values you're getting.

Yea thats what the program in C:\cygwin\usr\local\pspde v\psp\sdk\samples\control ler\basic does, and the pad.Ly value actually is 255 anywhere its at the top, about 35 degrees from top center. I believe that the problem with my program was some sort of issue with what sort of loop i was using. For one thing I don't know what the exclamation point means, but I plan on learning that here
, an excellent tutorial on C for complete n00bs. Of course at that site you must adapt for the PSP, but the information is still invaluable.

sceCtrlSetSamplingCycle(0 );
sceCtrlSetSamplingMode(PS P_CTRL_MODE_ANALOG);

^Does anyone know what that means? Because I know that it has something to do with getting the analog to work, but that is about it.

you need to include a while loop and put the controls inside of it btw

and for the 255 do a "> 225"(or something similar to that) and a "< 30" for the 0 incase you didnt understand what that guy was saying

Does anyone know how to calculate somethings square root in a program on the PSP? I looked for any examples in the cygwin folders, and I also looked through the source to PSP-PDA v1.2 since that can find square roots, but its written in C++ and I couldn't find anything about them. My dad was saying there might be a header file, or native PSP function, or a code snippet that would do it (he's relatively experienced at coding, but doesn't know this :icon_wink ).

soccerPMN -
#include <math.h>
add -lm to your makefile
and then you can use the sqrt() function

(The math library is going to be in Lesson 05 so stay tuned if you need more help ;))

Thanks a lot for the help! Also the tutorials are excellent. I have a recommendation that perhaps if you're teaching math functions in your tutorials, you could do something involving the quadratic equation, as that is what I am using the square root function for. Is there a release date yet for tutorial #5, possibly any 'beta tests'? lol

Also this isn't necessarily directed at you, but it would be a great help if someone could go through and 'heavily comment' some of the examples (included with cygwin/ the psptoolchain) to show/explain how they work, because that alone can be as valuable as a tutorial.

No, I don't give release dates, but keep checking back, I've been working on it (I added an RSS feed to the site so you can subscribe to that to know right when it is released)

Beta test an article? I think they call that proof reading :P

im sorry if this question has been asked before but i did try to find an answer, though this thread has become too unwieldy to search easily. I get this error on the fourth lesson when i do the 'make' on libpng

psp-gcc -I. -IC:\PSPide\/psp/sdk/include -O2 -G0 -c -o png.o png.c
In file included from png.c:13:
png.h:359:18: error: zlib.h: No such file or directory
In file included from png.h:363,
from png.c:13:
pngconf.h:1175: error: syntax error before '*' token
pngconf.h:1175: warning: data definition has no type or storage class
pngconf.h:1176: error: syntax error before '*' token
pngconf.h:1176: warning: data definition has no type or storage class
pngconf.h:1177: error: syntax error before '*' token
pngconf.h:1177: warning: data definition has no type or storage class
In file included from png.c:13:
png.h:1107: error: syntax error before 'z_stream'
png.h:1107: warning: no semicolon at end of struct or union
png.h:1179: error: 'gamma' redeclared as different kind of symbol
png.h:1353: error: syntax error before '}' token
png.h:2833: error: syntax error before 'png_zalloc'
png.h:2833: error: syntax error before 'png_ptr'
png.h:2833: warning: data definition has no type or storage class
png.h:2836: error: syntax error before 'png_ptr'
png.c: In function 'png_set_sig_bytes':
png.c:98: error: dereferencing pointer to incomplete type
png.c: At top level:
...
png.c:765: error: dereferencing pointer to incomplete type
png.c:766: error: dereferencing pointer to incomplete type
png.c:800: error: dereferencing pointer to incomplete type
make: *** [png.o] Error 1

Thanks!

Did you install zlib first?

well the thing is it installed it to pspide. whats up with that. So i uninstalled i, and it tried to install zlib again, but it keeps looking in pspide\... some place for the make. Any help?

same thing happened to me when I first installed the toolchain. I deleted everything associated with psp deving, tryd it again, and it still didnt work, so I just deleted everything again. About a month later I thought "hey, what the hell" and I tryd it once more, and it worked! so...good luck with your troubles im not sure how to fix em

My suggestion would be to delete the entire cygwin folder and start over. Worked for me when I messed up the numerous times.

funny you say that, since this actually was my 2nd tim around trying to completely redo cygwin. In any case, it works now, and i suggest that anyone who has persistent problems to just delete and redo te cygwin/toolchain as it's the only reliable way to make everything work.

I could definitely use a math tutorial now :neutral: This is my code and the errors it gets. I don't know about the numbers being called at all, but the errors from "main.c: at top level" down I get on and off after I'd try to make a variation of my program. Help please? Also I was wondering if I should just try to go through the actual solving of the quadratic equation step by step to see if it would work better? Thanks in advance for any help!

Code:

---

/*  This program will take the 3 variables from a quadratic equation

(Ax^2 + Bx + C = 0) and use the quadratic formula to find the roots

of the equation ({ })  */


#include <pspkernel.h>
#include <pspdebug.h>
#include <pspdisplay.h>
#include <pspctrl.h>
#include <math.h>

PSP_MODULE_INFO("Quadratic Calc", 0 , 1 , 1);

/* this is just to make typing easier*/
#define printf pspDebugScreenPrintf
#define setXY pspDebugScreenSetXY //sets location (text in this instance)
#define readCtrl sceCtrlReadBufferPositive //checks button status

/* Exit callback */
int exit_callback(int arg1, int arg2, void *common) {
                sceKernelExitGame();
                return 0;
}

/* Callback thread */
int CallbackThread(SceSize args, void *argp) {
                int cbid;

                cbid = sceKernelCreateCallback("Exit Callback", exit_callback, NULL);
                sceKernelRegisterExitCallback(cbid);

                sceKernelSleepThreadCB();

                return 0;
}

/* Sets up the callback thread and returns its thread id */
int SetupCallbacks(void) {
                int thid = 0;

                thid = sceKernelCreateThread("update_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
                if(thid >= 0) {
                                sceKernelStartThread(thid, 0, 0);
                }

                return thid;
}

int main() {

pspDebugScreenInit();
SetupCallbacks();
SceCtrlData pad;

unsigned int letter = 1;  //which variable's value is being changed, A = 1, B = 2, C = 3
int sumA = 0;  //A's value
int sumB = 0;  //B's value
int sumC = 0;  //C's value
int root1;  // b + radical b^2 - 4ac ...
int root2;  //b - radical b^2 - 4ac  ...


        printf("Ax^2 + Bx + C = 0\n");

    while(letter == 1)  {      // the number 1 corresponds to the letter A

            setXY (6,6);
                    printf("enter A:");

                        readCtrl(&pad, 1);

                        if(pad.Buttons & PSP_CTRL_TRIANGLE)  {

                                sumA++;

                        }
                        if(pad.Buttons & PSP_CTRL_CROSS)  {

                                sumA--;

                        }
                        if(pad.Buttons & PSP_CTRL_CIRCLE)  {

                                sumA = sumA + 5;

                        }
                        if(pad.Buttons & PSP_CTRL_SQUARE)  {

              sumA = sumA - 5;

            }

            setXY(6,7);
            printf("A = %i",sumA);

            if(pad.Buttons & PSP_CTRL_DOWN)  {

                letter = 2;

            }

    } //ends the while (letter == 1) (A) loop

    while (letter == 2)  {

          setXY(6,9);
          printf("Enter B:");

          readCtrl(&pad, 1);

                        if(pad.Buttons & PSP_CTRL_TRIANGLE)  {

                                sumB++;

                        }
                        if(pad.Buttons & PSP_CTRL_CROSS)  {

                                sumB--;

                        }
                        if(pad.Buttons & PSP_CTRL_CIRCLE)  {

                                sumB = sumB + 5;

                        }
                        if(pad.Buttons & PSP_CTRL_SQUARE)  {

              sumB = sumB - 5;

            }

            setXY(6,10);
            printf("B = %i",sumA);

            if(pad.Buttons & PSP_CTRL_DOWN)  {

                letter = 3;

            }
            if(pad.Buttons & PSP_CTRL_UP)  {

                letter = 1;

            }

      }  //ends the while(letter == 2) (B) loop


      while (letter == 3)  {

          setXY(6,12);
          printf("Enter C:");

          readCtrl(&pad, 1);

                        if(pad.Buttons & PSP_CTRL_TRIANGLE)  {

                                sumC++;

                        }
                        if(pad.Buttons & PSP_CTRL_CROSS)  {

                                sumC--;

                        }
                        if(pad.Buttons & PSP_CTRL_CIRCLE)  {

                                sumC = sumC + 5;

                        }
                        if(pad.Buttons & PSP_CTRL_SQUARE)  {

              sumC = sumC - 5;

            }

            setXY(6,13);
            printf("C = %i\n",sumA);
            printf("Press START to calculate the roots, press up to re-enter A or B.");

            }
            if(pad.Buttons & PSP_CTRL_UP)  {

                letter = 2;

            }
            if(pad.Buttons & PSP_CTRL_START)  {

                root1 = (-sumB  + sqrt(sumB^2 - 4 (sumA)(sumC)))/2(sumA);
                setXY(10,20);
                printf("root 1 = %d", root1);

                root2 = (-sumB  - sqrt(sumB^2 - 4 (sumA)(sumC)))/2(sumA);
                setXY(10,21);
                printf("root 2 = %d\n", root2);

            }



      }  //ends the while(letter == 3) (C) loop



sceKernelSleepThread();

return 0;

                }

---

http://www.geocities.com/zchnore/psp/make_error.jpg

root1 = (-sumB + sqrt(sumB^2 - 4 (sumA)(sumC)))/2(sumA);

That's not valid code... it's an equation:

Code:

---

root1 = ( (-1*sumB) + sqrt(pow(sumB,2) - (4 * (sumA)*(sumC) ) ))/2*(sumA);

---

Same goes for the other line like it about 4 lines down.

Edit: Oh, and sorry for you guys who were looking forward to the math library, unfortunately it isn't going to fit in the next tutorial. Hopefully it will be in the next one (this one was getting too long).

Thanks again! What is the subject of the Lesson 05 tutorial then? I am anxiously awaiting its release. Also, do you know what I should do about the final 4 errors I was getting, or should that fix them up?

edit: Yea I am still getting this error when I try to compile:

main.c:210: error: syntax error before 'return'
make: *** [main.o] Error 1

No, I"m not sure. Sorry. Hopefully someone else will know.

It doesn't understand the sceKernelSleepThread(); because it's not defined in any of your includes. You would need to include pspthreadman.h.

But I don't see a point in using it in your code, so you'd probably be better off removing it and using sceKernelExitGame(); in its place.

I have read 1-80 of this thread and I couldn't still find the anwser to the problem I have.

my .bat file looks like this
@echo off

C:
chdir C:\cygwin\bin

set path=%path%;C:/cygwin/usr/local/pspdev/bin
set PSPSDK=C:/cygwin/usr/local/pspdev

bash --login -i

but I still get the error:
$ make
make: psp-config: Command not found
Makefile:12: /lib/build.mak: No such file or directory
make: *** No rule to make target `/lib/build.mak'. Stop.

I tried everything that was suggested in this thread to fix that error, but its still not working.

I think that error would indicate that you've forgotten to run the toolchain script.

This has happened to me before, after installing the toolchain. If this is the case for you, you should try removing the toolchain files (except for the original archives they were packaged in) and run the script again.

Thanks, guys. I got it to work!! =c]

Just done the first lesson, this is sweet, and cmon people donate to the guy. ^_^

Just to ask , when installing the toolchain (the really long part that can take 32 hours!) do you have to be conected to the net?

yes it downloads packages from the internet