PSP_CTRL_* is being too responcive. Timer to slow it down?

[bunny]

Hi! Today I started making a video game for the psp. It is a simple puzzle game and right now I am about 5% through, if even that.

An example piece of code I have right now is:

   SceCtrlData pad;
   while(1) {
      sceCtrlReadBufferPositive(&pad, 1);

      if(pad.Buttons & PSP_CTRL_UP) {
         flipScreen();
         convert(x, y, outX, outY);
         blitAlphaImageToScreen(0 ,0 ,27, 27, grid, outX, outY);

         if (y == 0 && x < 9) {
            x++;
         } else if (y == 9 && x > 0) {
            x--;
         } else if (x == 0 && y > 0) {
            y--;
         } else if (x == 9 && y < 9) {
            y++;
         }

         convert(x, y, outX, outY);
         blitAlphaImageToScreen(0 ,0 ,27, 27, gun, outX, outY);
         flipScreen();
      }

grid is the background square, and gun is the object moving around.

The game is a 10x10 grid and on the outskirts of the grid the object moves around clockwise or counter-clockwise depending on what the user pushes.



My problem is when I push up, even if it moves around like I want it to, it moves way to fast. If I tap up slightly it might move 3 squares when I really want it to move 1 squares distance. I'm glad the psp is being responsive but is there a way to slow it down?

I tried to run a while loop in between and just have a number count up to slow it down, and surprisingly it had little to no effect on the speed. Also, I really don't want to put excess number crunching that is not required.

Is there a time pause command I can use or a library that can do that anyone knows about?


Also, when I hold down a button to move my object around the top 5 pixels horizontal flickers a lot which makes the background look bad. Anyone know the solution to this problem as well?


Thank you for any help!!

[nathan42100]

well, to solve the flickering, you need to have a VSync in there. You could also put a delay (for loop that loops a vsync) for each control. There is probably other ways if you don't want the action to loop.

[bunny]

Ok I put in sceDisplayWaitVblankStart(); and it fixed the problem right up. Thank you!

Now how do I put a delay exactly? Basically, that is what I was trying to ask the whole time.

I'm new to programming, so I have to apologize if the question has an easy solution, and I am just being stupid. sorry

[Soulkiller]

nathan said it

....You could also put a delay (for loop that loops a vsync) for each control....

put a vsync inside a for loop and loop it for X amount of times everytime a button is pressed

[bunny]

ohhhh!!!  Thank you!!

*bonks on the head* duh      

[SG57]

Or save yourself the time and variables:

Code:

sceKernelDelayThread(1000000 * #ofSECONDStoDELAY);

That will delay the thread for hte amount specified in microseconds (?).  So delaying 1 second would be 1,000,000 microseconds.  2 would be 1,000,000 * 2, etc...